wip

src/client/models-old/base_model.coffee

@@ -0,0 +1,129 @@
+#
+# Crafting Guide - base_model.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+########################################################################################################################
+
+module.exports = class BaseModel extends Backbone.Model
+
+    @_loadingQueue = []
+    @_isDraining   = false
+
+    constructor: (attributes={}, options={})->
+        options.logEvents ?= true
+        super attributes, options
+
+        makeGetter = (name)-> return -> @get name
+        makeSetter = (name)-> return (value)-> @set name, value
+        for name, value of attributes
+            continue if name is 'id'
+            Object.defineProperty this, name, get:makeGetter(name), set:makeSetter(name)
+
+        @fileCache = options.fileCache or null
+        @loading   = null
+        @logEvents = options.logEvents or false
+        @state     = c.modelState.unloaded
+
+        Object.defineProperties this,
+            isUnloaded: { get:-> @state is c.modelState.unloaded }
+            isLoading:  { get:-> @state is c.modelState.loading  }
+            isLoaded:   { get:-> @state is c.modelState.loaded   }
+            isError:    { get:-> @state is c.modelState.error    }
+
+    # Event Methods ################################################################################
+
+    onLoadSucceeded: (text, status, xhr)->
+        try
+            @set @parse text
+
+            @state = c.modelState.loaded
+            @trigger c.event.change, this
+            @trigger c.event.sync, this
+            logger.info => "#{@constructor.name}.#{@cid} loaded successfully"
+        catch e
+            logger.error -> "A parsing error occured: #{e.stack}"
+            @onLoadFailed e.message, 'parsing failed', xhr
+
+    onLoadFailed: (error, status, xhr)->
+        @state = c.modelState.error
+        logger.error => "#{@constructor.name}.#{@cid} failed to load: status:#{status}, message:#{error}"
+        @trigger c.event.error, this, error
+
+    # Backbone.Model Overrides #####################################################################
+
+    fetch: (options={})->
+        options.force ?= false
+        return if (@isLoading or @isLoaded) and not options.force
+
+        url = @url()
+        logger.info => "#{@constructor.name}.#{@cid} reading from url: #{url}"
+
+        @state = c.modelState.loading
+        @trigger c.event.request, this
+
+        loadFromServer = =>
+            w.promise (resolve, reject)=>
+                $.ajax
+                    url:      url
+                    dataType: 'text'
+                    success:  (text, status, xhr)=> resolve @onLoadSucceeded text, status, xhr
+                    error:    (xhr, status, error)=> reject @onLoadFailed error, status, xhr
+
+        if @fileCache?
+            @loading = @fileCache.loading.then =>
+                if @fileCache.hasFile url
+                    return @_addToLoadingQueue @fileCache.getFile(url), 'success', {url:url}
+                else
+                    @loading = loadFromServer()
+        else
+            @loading = loadFromServer()
+
+        @loading.catch (e)-> # do nothing
+        return @loading
+
+    parse: (text)->
+        return JSON.parse text
+
+    sync: (method, model)->
+        throw new Error "#{@constructor.name}.#{@cid} is not permitted to #{method}"
+
+    trigger: (name, model, args...)->
+        if @logEvents
+            argText = ("#{arg}"[0..50] for arg in args).join ", "
+            logger.trace => "#{@constructor.name}.#{@cid} triggered event #{name} with args: #{argText}"
+        super
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        return "#{@constructor.name}.#{@cid}"
+
+    # Private Methods ##############################################################################
+
+    _addToLoadingQueue: (text, status, xhr)->
+        deferred = w.defer()
+
+        BaseModel._loadingQueue.push resolve:deferred.resolve, func:(=> @onLoadSucceeded text, status, xhr)
+        @_drainLoadingQueue()
+        return deferred.promise
+
+    _drainLoadingQueue: ->
+        return if @_isDraining
+        @_isDraining = true
+
+        drainDelay = 50
+        drain = =>
+            toLoad = BaseModel._loadingQueue.shift()
+            if not toLoad?
+                @_isDraining = false
+            else
+                toLoad.func()
+                toLoad.resolve(true)
+
+                _.delay drain, drainDelay
+
+        _.delay drain, drainDelay
+

src/client/models-old/converter.coffee

@@ -0,0 +1,45 @@
+#
+# Crafting Guide - converter.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+Item    = require "../models/game/item"
+Mod     = require "../models/game/mod"
+ModPack = require "../models/game/mod_pack"
+
+########################################################################################################################
+
+module.exports = class Converter
+
+    # Public Methods ###############################################################################
+
+    convert: (id, displayName, oldModPack)->
+        modSlugToIdMap = {}
+        itemSlugToIdMap = {}
+
+        newModPack = new ModPack id:id, displayName:displayName
+        oldModPack.eachMod (oldMod)=>
+            newMod = new Mod id:_.uniqueId("mod-"), displayName:oldMod.name, modPack:newModPack
+            modSlugToIdMap[oldMod.slug.toString()] = newMod.id
+
+            oldMod.eachItem (oldItem)=>
+                newItem = new Item id:_.uniqueId("item-"), displayName:oldItem.name, mod:newMod
+                itemSlugToIdMap[oldItem.slug.toString()] = newItem.id
+
+                if oldItem.isGatherable?
+                    newItem.isGatherable = oldItem.isGatherable
+
+        oldModPack.eachMod (oldMod)=>
+            newMod = newModPack.mods[modSlugToIdMap[oldMod.slug.toString()]]
+
+
+        return newModPack
+
+    # Private Methods ##############################################################################
+
+    _convertItem: (oldItem, newMod)->
+
+    _convertMod: (oldMod, newModPack)->
+        return newMod

src/client/models-old/event_recorder.coffee

@@ -0,0 +1,36 @@
+#
+# Crafting Guide - event_recorder.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+util = require 'util'
+
+########################################################################################################################
+
+module.exports = class EventRecorder
+
+    constructor: (model)->
+        if not model? then throw new Error 'model is required'
+
+        @model = model
+        @events = []
+
+        @model.on 'all', (event, model, args...)=>
+            logger.verbose -> "#{model?.constructor?.name}(#{model?.cid}) emitted #{event}
+                with args: #{util.inspect(args)}"
+            @events.push id:model?.cid, event:event, args:args
+
+    # Public Methods ###############################################################################
+
+    reset: ->
+        @events = []
+
+    # Property Methods #############################################################################
+
+    getNames: ->
+        return (e.event for e in @events)
+
+    Object.defineProperties @prototype,
+        names: {get:@prototype.getNames}

src/client/models-old/game/inventory.coffee

@@ -0,0 +1,243 @@
+#
+# Crafting Guide - inventory.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel = require '../base_model'
+ItemSlug  = require './item_slug'
+Stack     = require './stack'
+
+########################################################################################################################
+
+module.exports = class Inventory extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        super attributes, options
+        attributes.modPack ?= null
+        @clear()
+
+        if options.clone?
+            @addInventory options.clone
+
+    # Class Methods ################################################################################
+
+    @Delimiters =
+        Item: '.'
+        Stack: ':'
+
+    # Public Methods ###############################################################################
+
+    add: (itemSlug, quantity=1, options={})->
+        return this unless quantity > 0
+
+        @_add itemSlug, quantity, options
+        @trigger c.event.add, this, itemSlug, quantity
+        @trigger c.event.change, this
+        return this
+
+    addInventory: (inventory)->
+        inventory.each (stack)=> @_add stack.itemSlug, stack.quantity
+
+        @trigger c.event.change, this
+        return this
+
+    clear: (options={})->
+        @_stacks = {}
+        @_itemSlugs = []
+
+        @trigger c.event.change, this
+
+    clone: ->
+        inventory = new Inventory
+        inventory.addInventory this
+        return inventory
+
+    each: (callback)->
+        for itemSlug in @_itemSlugs
+            stack = @_stacks[itemSlug]
+            continue unless stack?
+            callback stack
+
+    getSlugs: ->
+        return @_itemSlugs[..]
+
+    hasAtLeast: (itemSlug, quantity=1)->
+        if quantity is 0 then return true
+
+        stack = @_stacks[itemSlug]
+        return false unless stack?
+        return stack.quantity >= quantity
+
+    localize: ->
+        if not @modPack? then throw new Error 'localize requires @modPack'
+
+        changed = false
+        newSlugs = []
+        newStacks = []
+        for itemSlug in @_itemSlugs
+            stack = @_stacks[itemSlug]
+            continue unless stack?
+
+            qualifiedSlug = if itemSlug.isQualified then itemSlug else null
+            if not qualifiedSlug?
+                qualifiedSlug = @modPack.findItem(itemSlug)?.slug
+                changed = qualifiedSlug?
+
+            if qualifiedSlug?
+                newSlugs.push qualifiedSlug
+                newStacks.push new Stack itemSlug:qualifiedSlug, quantity:stack.quantity
+            else
+                newSlugs.push itemSlug
+                newStacks.push stack
+
+        if changed
+            for itemSlug, stack of @_stacks
+                @stopListening stack
+
+            @_itemSlugs = newSlugs
+            @_stacks = {}
+            for stack in newStacks
+                @_stacks[stack.itemSlug] = stack
+                @listenTo stack, c.event.change, => @trigger c.event.change, this
+
+            @_sort()
+            @trigger c.event.change, this
+
+    pop: ->
+        itemSlug = @_itemSlugs.pop()
+        return null unless itemSlug?
+
+        stack = @_stacks[itemSlug]
+        delete @_stacks[itemSlug]
+
+        @trigger c.event.remove, this, stack.itemSlug, stack.quantity
+        @trigger c.event.change, this
+        return stack
+
+    quantityOf: (itemSlug)->
+        stack = @_stacks[itemSlug]
+        return stack.quantity if stack
+        return 0
+
+    remove: (itemSlug, quantity=null)->
+        stack = @_stacks[itemSlug]
+        return this unless stack?
+
+        quantity ?= stack.quantity
+        return this unless quantity > 0
+
+        if stack.quantity < quantity
+            throw new Error "cannot remove #{quantity}: only #{stack.quantity} #{itemSlug} in this inventory"
+
+        stack.quantity -= quantity
+        if stack.quantity is 0
+            @stopListening stack
+            delete @_stacks[itemSlug]
+            @_itemSlugs = (s for s in @_itemSlugs when not ItemSlug.equal(s, itemSlug))
+
+        @trigger c.event.remove, this, itemSlug, quantity
+        @trigger c.event.change, this
+        return this
+
+    toDescription: ->
+        return null if @isEmpty
+        return null unless @modPack?
+
+        item = @modPack.findItem @_itemSlugs[0]
+        extras = @_itemSlugs.length - 1
+
+        result = "#{item.name}"
+        if extras > 0 then result += " and #{extras} more..."
+
+        return result
+
+    # Parsing Methods ##############################################################################
+
+    parse: (data)->
+        return this if not data? or data.length is 0
+
+        stacks = data.split Inventory.Delimiters.Stack
+        for stackText in stacks
+            stackParts = stackText.split Inventory.Delimiters.Item
+            if stackParts.length is 2
+                quantity = parseInt stackParts[0], 10
+                itemSlug = ItemSlug.slugify stackParts[1]
+            else if stackParts.length is 1
+                quantity = 1
+                itemSlug = ItemSlug.slugify stackParts[0]
+            else
+                throw new Error "expected #{stackText} to have 0 or 1 parts"
+
+            if itemSlug.qualified.length > 0
+                @add itemSlug, quantity
+
+        return this
+
+    unparse: (options={})->
+        parts = []
+        @each (stack)=>
+            slugText = stack.itemSlug.item
+            if @modPack?
+                item = @modPack.findItem ItemSlug.slugify slugText
+                if item? and item.slug.qualified isnt stack.itemSlug.qualified
+                    slugText = stack.itemSlug.qualified
+
+            if stack.quantity is 1
+                parts.push slugText
+            else
+                parts.push "#{stack.quantity}#{Inventory.Delimiters.Item}#{slugText}"
+
+        return parts.join Inventory.Delimiters.Stack
+
+    # Property Methods #############################################################################
+
+    Object.defineProperties @prototype,
+        isEmpty:
+            get: -> @_itemSlugs.length is 0
+
+        totalQuantity:
+            get: ->
+                total = 0
+                @each (stack)->
+                    total += stack.quantity
+                return total
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        result = [@constructor.name, " (", @cid, ") {items: ["]
+
+        needsDelimiter = false
+        @each (stack)->
+            if needsDelimiter then result.push ', '
+            result.push stack.toString()
+            needsDelimiter = true
+        result.push ']'
+
+        result.push '}'
+        return result.join ''
+
+    # Private Methods ##############################################################################
+
+    _add: (itemSlug, quantity=1, options={})->
+        options.insert ?= false
+        return unless itemSlug?
+        return unless quantity > 0
+
+        stack = @_stacks[itemSlug]
+        if not stack?
+            stack = new Stack itemSlug:itemSlug, quantity:quantity
+            @listenTo stack, c.event.change, => @trigger c.event.change, this
+            @_stacks[itemSlug] = stack
+            if options.insert
+                @_itemSlugs.unshift itemSlug
+            else
+                @_itemSlugs.push itemSlug
+            @_sort()
+        else
+            stack.quantity += quantity
+
+    _sort: ->
+        @_itemSlugs.sort (a, b)-> ItemSlug.compare a, b

src/client/models-old/game/item.coffee

@@ -0,0 +1,90 @@
+#
+# Crafting Guide - item.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel       = require '../base_model'
+ItemSlug        = require './item_slug'
+Recipe          = require './recipe'
+{StringBuilder} = require 'crafting-guide-common'
+
+########################################################################################################################
+
+module.exports = class Item extends BaseModel
+
+    @Group = Other:'Other'
+
+    constructor: (attributes={}, options={})->
+        if not attributes.name? then throw new Error 'attributes.name is required'
+
+        attributes.description          ?= null
+        attributes.group                ?= Item.Group.Other
+        attributes.ignoreDuringCrafting ?= false
+        attributes.isGatherable         ?= false
+        attributes.modVersion           ?= null
+        attributes.officialUrl          ?= null
+        attributes.slug                 ?= ItemSlug.slugify attributes.name
+        attributes.videos               ?= []
+
+        options.logEvents ?= false
+        super attributes, options
+
+        @on c.event.change + ':modVersion', =>
+            @_isCraftable = null
+            @slug.mod = @modVersion?.modSlug
+
+    # Public Methods ###############################################################################
+
+    compareTo: (that)->
+        if this.slug isnt that.slug
+            return if this.slug < that.slug then -1 else +1
+        if this.name isnt that.name
+            return if this.name < that.name then -1 else +1
+        return 0
+
+    unparse: ->
+        ItemParser = require '../parsing/item_parser' # to avoid require cycles
+        @_parser ?= new ItemParser model:this
+        return @_parser.unparse()
+
+    # Property Methods #############################################################################
+
+    getIsCraftable: ->
+        if not @_isCraftable?
+            @_isCraftable = false
+            if @modVersion?
+                @_isCraftable = @modVersion.hasRecipes @slug
+
+        return @_isCraftable
+
+    Object.defineProperties @prototype,
+        isCraftable: {get:@prototype.getIsCraftable}
+
+    # Backbone.Model Overrides #####################################################################
+
+    parse: (text)->
+        ItemParser = require '../parsing/item_parser' # to avoid require cycles
+        @_parser ?= new ItemParser model:this
+        @_parser.parse text
+
+        return null # prevent calling `set`
+
+    url: ->
+        return c.url.itemData modSlug:@slug.mod, itemSlug:@slug.item
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        builder = new StringBuilder
+        return builder
+            .push @constructor.name, ' (', @cid, ') { '
+            .push 'name:"', @name, '", '
+            .push 'isCraftable:', @isCraftable, ', '
+            .push 'isGatherable:', @isGatherable, ', '
+            .onlyIf (@group isnt Item.Group.Other), (b)=>
+                b.push 'group:"', @group, '", '
+            .push 'slug:"', @slug, '", '
+            .push '}'
+            .toString()

src/client/models-old/game/mod.coffee

@@ -0,0 +1,234 @@
+#
+# Crafting Guide - mod.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel = require '../base_model'
+
+########################################################################################################################
+
+module.exports = class Mod extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        if not attributes.slug? then throw new Error 'attributes.slug is required'
+
+        attributes.author           ?= ''
+        attributes.description      ?= ''
+        attributes.documentationUrl ?= null
+        attributes.downloadUrl      ?= null
+        attributes.homePageUrl      ?= null
+        attributes.modPack          ?= null
+        attributes.name             ?= ''
+
+        super attributes, options
+
+        @_activeModVersion = null
+        @_activeVersion    = null
+        @_modVersions      = []
+        @_tutorials        = []
+
+    # Class Methods ##################################################################################
+
+    @Version: Version =
+        None: 'none'
+        Latest: 'latest'
+
+    # Public Methods #################################################################################
+
+    compareTo: (that)->
+        thisRequired = this.slug in c.requiredMods
+        thatRequired = that.slug in c.requiredMods
+
+        if thisRequired isnt thatRequired
+            return -1 if thisRequired
+            return +1 if thatRequired
+        else if this.slug isnt that.slug
+            return if this.slug < that.slug then -1 else +1
+
+        return 0
+
+    # Property Methods #############################################################################
+
+    Object.defineProperties @prototype,
+
+        activeModVersion:
+            get: -> @_activeModVersion
+
+        activeVersion:
+            get: ->
+                return @_activeVersion
+
+            set: (version)->
+                return if version is @_activeVersion
+
+                version ?= Mod.Version.None
+                if version is Mod.Version.Latest then version = _.last(@_modVersions).version
+
+                if version is Mod.Version.None
+                    @_activeVersion = version
+                    @_activateModVersion null
+
+                    @trigger c.event.change + ':activeVersion', this, @_activeVersion
+                    @trigger c.event.change, this
+                else
+                    for modVersion in @_modVersions
+                        if version is modVersion.version
+                            @_activateModVersion modVersion
+                            break
+
+                    @_activeVersion = version
+                    @trigger c.event.change + ':activeVersion', this, @_activeVersion
+                    @trigger c.event.change, this
+
+        enabled:
+            get: -> @_activeModVersion?
+
+        modVersions:
+            get: -> @_modVersions[..]
+
+        tutorials:
+            get: -> @getAllTutorials()
+
+    # Item Methods #################################################################################
+
+    chooseRandomItem: ->
+        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
+        return null unless effectiveModVersion?
+
+        return effectiveModVersion.chooseRandomItem()
+
+    eachItem: (callback)->
+        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
+        effectiveModVersion.eachItem callback
+
+    findItem: (slug, options={})->
+        options.includeDisabled ?= false
+        options.enableAsNeeded  ?= false
+
+        if not options.includeDisabled
+            return unless @_activeModVersion?
+            return @_activeModVersion.findItem slug
+        else
+            for modVersion in @_modVersions
+                modVersion.fetch()
+
+                item = modVersion.findItem slug
+                if item?
+                    if options.enableAsNeeded then @setActiveVersion modVersion.version
+                    return item
+
+        return null
+
+    findItemByName: (name)->
+        return unless @_activeModVersion?
+        @_activeModVersion.findItemByName name
+
+    # ModVersion Methods ###########################################################################
+
+    addModVersion: (modVersion)->
+        return unless modVersion?
+        return if @_modVersions.indexOf(modVersion) isnt -1
+
+        @_modVersions.push modVersion
+        @listenTo modVersion, c.event.change, => @trigger c.event.change, this
+        modVersion.fileCache = this.fileCache
+        modVersion.mod = this
+
+        @trigger c.event.add + ':modVersion', modVersion, this
+        @trigger c.event.change + ':version', modVersion, this
+        @trigger c.event.change, this
+
+        if not @activeVersion? then @activeVersion = modVersion.version
+        if modVersion.version is @_activeVersion then @_activateModVersion modVersion
+        return this
+
+    eachModVersion: (callback)->
+        for modVersion in @_modVersions
+            callback modVersion
+
+    getAllModVersions: ->
+        return @_modVersions[..]
+
+    getModVersion: (version)->
+        return null if version is Mod.Version.None
+        return @_modVersions[0] if version is Mod.Version.Latest
+
+        for modVersion in @_modVersions
+            return modVersion if modVersion.version is version
+
+        return null
+
+    # Name Methods #################################################################################
+
+    eachName: (callback)->
+        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
+        effectiveModVersion.eachName callback
+
+    findName: (itemSlug)->
+        return unless @_activeModVersion?
+        @_activeModVersion.findName itemSlug
+
+    # Recipe Methods ###############################################################################
+
+    eachRecipe: (callback)->
+        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
+        effectiveModVersion.eachRecipe callback
+
+    findRecipes: (itemSlug, result=[], options={})->
+        options.alwaysFromOwningMod ?= false
+
+        if @_activeModVersion?
+            return @_activeModVersion.findRecipes itemSlug, result, options
+        else if options.alwaysFromOwningMod and itemSlug.mod is @slug
+            return @getModVersion(Mod.Version.Latest).findRecipes itemSlug, result, options
+
+        return null
+
+    # Tutorial Methods #############################################################################
+
+    addTutorial: (tutorial)->
+        return unless tutorial?
+        if @getTutorial(tutorial.slug)? then throw new Error "duplicate tutorial: #{tutorial.name}"
+        @_tutorials.push tutorial
+        tutorial.modSlug = @slug
+
+    getAllTutorials: ->
+        return @_tutorials[..]
+
+    getTutorial: (tutorialSlug)->
+        for tutorial in @_tutorials
+            return tutorial if tutorial.slug is tutorialSlug
+        return null
+
+    # Backbone.Model Overrides #####################################################################
+
+    parse: (text)->
+        ModParser = require '../parsing/mod_parser' # to avoid require cycles
+        @_parser ?= new ModParser model:this
+        @_parser.parse text
+
+        @_verifyActiveModVersion()
+
+        return null # prevent calling `set`
+
+    url: ->
+        return c.url.modData modSlug:@slug
+
+    # Private Methods ##############################################################################
+
+    _activateModVersion: (modVersion)->
+        if @_activeModVersion? then @stopListening @_activeModVersion
+        @_activeModVersion = modVersion
+        @trigger c.event.change + ':activeModVersion', this, @_activeModVersion
+
+        logger.verbose => "#{@slug} switched to version #{@_activeVersion}"
+
+        if @_activeModVersion?
+            @listenTo @_activeModVersion, 'all', -> @trigger.apply this, arguments
+
+    _verifyActiveModVersion: ->
+        if (@_activeVersion isnt Version.None) and (not @_activeModVersion?)
+            logger.warning => "#{@slug} no longer has a version #{@_activeVersion}, using latest instead"
+            @activeVersion = Version.Latest

src/client/models-old/game/mod_pack.coffee

@@ -0,0 +1,202 @@
+#
+# Crafting Guide - mod_pack.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel        = require '../base_model'
+Mod              = require './mod'
+ModVersionParser = require '../parsing/mod_version_parser'
+Recipe           = require './recipe'
+SimpleInventory  = require '../crafting/simple_inventory'
+
+########################################################################################################################
+
+module.exports = class ModPack extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        super attributes, options
+
+        @_mods = []
+        @_cache = {}
+
+        @on c.event.change, => @_cache = {}
+
+    # Item Methods #################################################################################
+
+    chooseRandomItem: ->
+        return null unless @_mods.length > 0
+
+        modIndex = Math.floor Math.random() * @_mods.length
+        return @_mods[modIndex].chooseRandomItem()
+
+    findItem: (itemSlug, options={})->
+        options.includeDisabled ?= false
+
+        key = "#{itemSlug}-#{options.includeDisabled}"
+        @_cache.itemBySlug ?= {}
+        item = @_cache.itemBySlug[key]
+        return item if item?
+
+        if itemSlug.isQualified
+            mod = @getMod itemSlug.mod
+            if mod?
+                item = mod.findItem itemSlug, options
+
+        if not item?
+            for mod in @_mods
+                continue unless mod.enabled or options.includeDisabled
+                item = mod.findItem itemSlug, options
+                break if item?
+
+        if item?
+            @_cache.itemBySlug[key] = item
+
+        return item
+
+    findItemByName: (name, options={})->
+        options.enableAsNeeded ?= false
+        options.includeDisabled = true if options.enableAsNeeded
+
+        for mod in @_mods
+            continue unless mod.enabled or options.includeDisabled
+            item = mod.findItemByName name, options
+            return item if item?
+
+        return null
+
+    findItemDisplay: (itemSlug)->
+        if not itemSlug? then throw new Error 'itemSlug is required'
+
+        result = {slug:itemSlug}
+        item = @findItem itemSlug, includeDisabled:true
+        if item?
+            result.itemName   = item.name
+            result.itemSlug   = item.slug.item
+            result.modSlug    = item.slug.mod
+            result.modVersion = item.modVersion.version
+        else
+            result.itemName   = @findName itemSlug, includeDisabled:true
+            result.itemSlug   = itemSlug.item
+            result.modSlug    = @_mods[0].slug
+            result.modVersion = @_mods[0].activeVersion
+
+        craftingUrlInventory = new SimpleInventory modPack:this
+        if item?.multiblock?
+            craftingUrlInventory.addInventory item.multiblock.inventory
+        else
+            craftingUrlInventory.add itemSlug
+
+        result.craftingUrl = c.url.crafting inventoryText:craftingUrlInventory.unparse()
+        result.iconUrl     = c.url.itemIcon result
+        result.itemUrl     = c.url.item result
+        result.modName     = @getMod(result.modSlug).name
+        return result
+
+    qualifySlug: (itemSlug)->
+        return itemSlug if itemSlug.isQualified
+
+        item = @findItem itemSlug
+        return item.slug if item?
+        return itemSlug
+
+    # Mod Methods ##################################################################################
+
+    addMod: (mod)->
+        if not mod? then throw new Error 'mod is required'
+        return if @_mods.indexOf(mod) isnt -1
+
+        mod.modPack = this
+        @_mods.push mod
+        @listenTo mod, c.event.change, (modVersion)=> @_onModVersionLoaded modVersion
+        @trigger c.event.add + ':mod', mod, this
+
+        @_mods.sort (a, b)-> a.compareTo b
+        @trigger c.event.sort + ':mod', this
+        @trigger c.event.change, this
+
+        return this
+
+    eachMod: (callback)->
+        for mod in @_mods
+            callback mod
+
+    getMod: (slug)->
+        for mod in @_mods
+            return mod if mod.slug is slug
+        return null
+
+    getAllMods: ->
+        return @_mods[..]
+
+    removeMod: (mod)->
+        index = @_mods.indexOf mod
+        return unless index >= 0
+
+        @_mods.splice index, 1
+
+        @trigger c.event.remove, this, mod.slug
+        @trigger c.event.change, this
+
+    # Name Methods #################################################################################
+
+    findName: (slug, options={})->
+        options.includeDisabled ?= false
+
+        for mod in @_mods
+            continue unless mod.enabled or options.includeDisabled
+            name = mod.findName slug
+            return name if name
+
+        return null
+
+    # Recipe Methods ###############################################################################
+
+    findRecipes: (itemSlug, options={})->
+        options.alwaysFromOwningMod ?= false
+        return null unless itemSlug?
+
+        key = "#{itemSlug}-#{options.alwaysFromOwningMod}"
+        @_cache.recipesBySlug ?= {}
+        result = @_cache.recipesBySlug[key]
+        return result if result?
+
+        result = []
+        for mod in @_mods
+            if not mod.enabled
+                owningMod = itemSlug.isQualified and (itemSlug.mod is mod.slug)
+                continue unless owningMod and options.alwaysFromOwningMod
+
+            mod.findRecipes itemSlug, result, options
+
+        @_cache.recipesBySlug[key] = result
+        return if result.length > 0 then result else null
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        return "ModPack (#{@cid}) {modVersions:«#{@_mods.length} items»}"
+
+    # Private Methods ##############################################################################
+
+    _onModVersionLoaded: (modVersion)->
+        mods = @getAllMods()
+        return true unless mods.length > 0
+
+        for mod in mods
+            if mod.isError
+                @removeMod mod
+                continue
+
+            modVersions = mod.getAllModVersions()
+            return true unless modVersions.length > 0
+            continue if mod.activeVersion is Mod.Version.None
+
+            activeModVersion = mod.activeModVersion
+            return true unless activeModVersion?
+            return true if activeModVersion.isUnloaded
+            return true if activeModVersion.isLoading
+
+        @trigger c.event.change, this
+        @trigger c.event.sync, this

src/client/models-old/game/recipe.coffee

@@ -0,0 +1,247 @@
+#
+# Crafting Guide - recipe.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel       = require '../base_model'
+ItemSlug        = require './item_slug'
+Stack           = require './stack'
+{StringBuilder} = require 'crafting-guide-common'
+
+########################################################################################################################
+
+module.exports = class Recipe extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        if not attributes.input? then throw new Error 'attributes.input is required'
+        if not attributes.pattern? then throw new Error 'attributes.pattern is required'
+
+        if attributes.itemSlug? and not attributes.output?
+            attributes.output = [new Stack itemSlug:attributes.itemSlug, quantity:1]
+        else if attributes.output? and not attributes.itemSlug?
+            if attributes.output.length is 0 then throw new Error 'attributes.output cannot be empty'
+            attributes.itemSlug = attributes.output[0].itemSlug
+        else
+            throw new Error 'attributes.itemSlug or attributes.output is required'
+
+        attributes.pattern = @_parsePattern attributes.pattern
+
+        attributes.condition            ?= null
+        attributes.ignoreDuringCrafting ?= false
+        attributes.modVersion           ?= null
+        attributes.tools                ?= []
+        options.logEvents               ?= false
+        super attributes, options
+
+        @_computeQuantities attributes.pattern
+
+        @on c.event.change + ':modVersion', => @_slug = null
+        @on c.event.change + ':pattern', => @_patternCache = null
+
+    # Class Methods ################################################################################
+
+    @compareFor: (a, b, itemSlug)->
+        if itemSlug?
+            aValue = a.itemSlug.matches itemSlug
+            bValue = b.itemSlug.matches itemSlug
+            if aValue isnt bValue
+                return -1 if aValue
+                return +1 if bValue
+
+            aValue = a.getQuantityProduced itemSlug
+            bValue = b.getQuantityProduced itemSlug
+            if aValue isnt bValue
+                return if aValue > bValue then -1 else +1
+
+        return 0
+
+    # Public Methods ###############################################################################
+
+    getStackAtSlot: (patternSlot)->
+        trueIndex = 0:0, 1:1, 2:2, 3:4, 4:5, 5:6, 6:8, 7:9, 8:10
+        patternDigit = @pattern[trueIndex[patternSlot]]
+        return null unless patternDigit?
+        return null unless patternDigit.match /[0-9]/
+
+        stack = @input[parseInt(patternDigit)]
+        return null unless stack?
+
+        return stack
+
+    getQuantityProduced: (itemSlug)->
+        total = 0
+        for stack in @output
+            if stack.itemSlug.matches itemSlug
+                total += stack.quantity
+
+        return total
+
+    getQuantityRequired: (itemSlug)->
+        total = 0
+        for stack, index in @input
+            if ItemSlug.equal stack.itemSlug, itemSlug
+                total += @_quantities[index] * stack.quantity
+
+        return total
+
+    hasAllTools: (modPack)->
+        modPack ?= @modVersion?.mod?.modPack
+        return true unless modPack?
+
+        for stack in @tools
+            return false unless modPack.findItem stack.itemSlug
+        return true
+
+    isConditionSatisfied: (modPack)->
+        return true unless @condition?
+        modPack ?= @modVersion?.mod?.modPack
+
+        result = false
+        if @condition.verb is 'item'
+            if modPack?.findItemByName(@condition.noun)?
+                result = true
+        else if @condition.verb is 'mod'
+            modPack.eachMod (mod)=>
+                if mod.name is @condition.noun
+                    result = true
+
+        if @condition.inverted then result = not result
+        return result
+
+    isPassThroughFor: (itemSlug)->
+        return @getQuantityProduced(itemSlug) is @getQuantityRequired(itemSlug)
+
+    produces: (itemSlug)->
+        if not @_produces?
+            @_produces = {}
+
+            for stack in @output
+                actuallyProduces = not @isPassThroughFor stack.itemSlug
+                @_produces[stack.itemSlug.qualified] = actuallyProduces
+
+        result = @_produces[itemSlug.qualified] or @_produces[itemSlug.item]
+        return result
+
+    requires: (itemSlug)->
+        for stack in @input
+            if stack.itemSlug.matches itemSlug
+                return true
+        return false
+
+    requiresTool: (itemSlug)->
+        for stack in @tools
+            if stack.itemSlug.matches itemSlug
+                return true
+
+    # Property Methods #############################################################################
+
+    Object.defineProperties @prototype,
+
+        slug:
+            get: ->
+                if not @_slug?
+                    builder = new StringBuilder
+                    delimiterNeeded = false
+                    for stack in @input
+                        if delimiterNeeded then builder.push ','
+                        delimiterNeeded = true
+
+                        if stack.quantity > 1 then builder.push stack.quantity, ' '
+                        builder.push stack.itemSlug.qualified
+
+                    builder.push '>'
+                    builder.push @pattern
+                    builder.push '>'
+                    for stack in @tools
+                        builder.push stack.itemSlug.qualified
+                    builder.push '>'
+
+                    delimiterNeeded = false
+                    for stack in @output
+                        if delimiterNeeded then builder.push ','
+                        delimiterNeeded = true
+
+                        if stack.quantity > 1 then builder.push stack.quantity, ' '
+                        builder.push stack.itemSlug.qualified
+
+                    @_slug = builder.toString()
+
+                return @_slug
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        result = [@constructor.name, " (", @cid, ") { name:", @name]
+
+        result.push ", input:["
+        needsDelimiter = false
+        for stack in @input
+            if needsDelimiter then result.push ', '
+            result.push @getQuantityRequired stack.itemSlug
+            result.push ' '
+            result.push stack.itemSlug
+            needsDelimiter = true
+        result.push ']'
+
+        result.push ", output:["
+        needsDelimiter = false
+        for stack in @output
+            if needsDelimiter then result.push ', '
+            result.push @getQuantityProduced stack.itemSlug
+            result.push ' '
+            result.push stack.itemSlug
+            needsDelimiter = true
+        result.push ']'
+
+        if @tools.length > 0
+            result.push ", tools:["
+            needsDelimiter = false
+            for stack in @tools
+                if needsDelimiter then result.push ', '
+                result.push stack.toString()
+                needsDelimiter = true
+            result.push ']'
+
+        result.push '}'
+        return result.join ''
+
+    # Private Methods ##############################################################################
+
+    _computeQuantities: (pattern)->
+        quantityMap = {}
+
+        index = 0
+        while index < pattern.length
+            c = pattern[index]
+            index += 1
+
+            continue if c is '.'
+            continue if c is ' '
+
+            if quantityMap[c]?
+                quantityMap[c] += 1
+            else
+                quantityMap[c] = 1
+
+        @_quantities = []
+        for i in [0...@input.length]
+            @_quantities.push quantityMap["#{i}"]
+
+    _parsePattern: (pattern)->
+        return unless pattern?
+
+        pattern = pattern.replace /\ /g, ''
+        return if pattern.length is 0
+
+        pattern = pattern.replace /[^0-9]/g, '.'
+
+        array = pattern.split ''
+        array = array[0...9]
+        while array.length isnt 9
+            array.push '.'
+
+        pattern = array.join ''
+        pattern = pattern.replace /(...)(...)(...)/, '$1 $2 $3'
+        return pattern

src/client/models-old/game/stack.coffee

@@ -0,0 +1,23 @@
+#
+# Crafting Guide - stack.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel = require '../base_model'
+
+########################################################################################################################
+
+module.exports = class Stack extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        if not attributes.itemSlug? then throw new Error 'attributes.itemSlug is required'
+        attributes.quantity ?= 1
+        options.logEvents   ?= false
+        super attributes, options
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        return "#{@quantity} #{@itemSlug}"

src/client/models-old/site/tutorial.coffee

@@ -0,0 +1,33 @@
+#
+# Crafting Guide - tutorial.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+BaseModel = require '../base_model'
+
+########################################################################################################################
+
+module.exports = class Tutorial extends BaseModel
+
+    constructor: (attributes={}, options={})->
+        if not attributes.name?.length > 0 then throw new Error "attributes.name cannot be empty"
+        attributes.modSlug     ?= null
+        attributes.officialUrl ?= null
+        attributes.sections    ?= []
+        attributes.slug        ?= _.slugify attributes.name
+        attributes.videos      ?= []
+        super attributes, options
+
+    # Backbone.Model Overrides #####################################################################
+
+    parse: (text)->
+        TutorialParser = require '../parsing/tutorial_parser' # to avoid require cycles
+        @_parser ?= new TutorialParser model:this
+        @_parser.parse text
+
+        return null # prevent calling `set`
+
+    url: ->
+        return c.url.tutorialData modSlug:@modSlug, tutorialSlug:@slug

src/client/models/crafting/crafting_plan.coffee

@@ -5,7 +5,7 @@
 # All rights reserved.
 #
 
-Inventory       = require "./inventory"
+Inventory       = require "../game/inventory"
 {StringBuilder} = require "crafting-guide-common"
 
 ########################################################################################################################
@@ -20,8 +20,8 @@ module.exports = class CraftingPlan
         @steps  = attributes.steps
         @want   = attributes.want
 
-        @_consolidateSteps()
         @_computeResources()
+        @_consolidateSteps()
 
     # Properties ###################################################################################
 

src/client/models/crafting/crafting_plan.test.coffee

@@ -7,8 +7,8 @@
 
 CraftingPlan     = require './crafting_plan'
 CraftingPlanStep = require './crafting_plan_step'
-Inventory        = require './inventory'
-fixtures         = require './fixtures'
+Inventory        = require '../game/inventory'
+fixtures         = require '../fixtures'
 
 ########################################################################################################################
 

src/client/models/crafting/evaluation.coffee

@@ -15,7 +15,7 @@ module.exports = class Evaluation
         @recipe    = attributes.recipe if attributes.recipe?
         @baseScore = attributes.baseScore
 
-        @_baseEvaluations = []
+        @_id = _.uniqueId "evaluation-"
         @_includedTools = {}
         @_toolScore = null
 
@@ -23,10 +23,6 @@ module.exports = class Evaluation
 
     Object.defineProperties @prototype,
 
-        baseEvaluations:
-            get: -> return @_baseEvaluations
-            set: -> throw new Error "baseEvaluations cannot be assigned"
-
         baseScore:
             get: -> return @_baseScore
             set: (baseScore)->
@@ -70,13 +66,15 @@ module.exports = class Evaluation
 
     # Public Methods ###############################################################################
 
-    addBaseEvaluation: (evaluation)->
-        @_baseEvaluations.push evaluation
-
     addIncludedTool: (item)->
+        return if @_includedTools[item.id]?
         @_includedTools[item.id] = item
         @_toolScore = null
 
+    addIncludedToolsFrom: (evaluation)->
+        for id, toolItem of evaluation.includedTools
+            @addIncludedTool toolItem
+
     computeTotalScore: (quantity=1)->
         if @item?
             multiplier = quantity
@@ -86,18 +84,13 @@ module.exports = class Evaluation
         return @baseScore * multiplier + @toolScore
 
     isToolIncluded: (item)->
-        return true if @_includedTools[item.id]?
-
-        for baseEvaluation in @_baseEvaluations
-            return true if baseEvaluation.isToolIncluded item
-
-        return false
+        return @_includedTools[item.id]?
 
     # Object Overrides #############################################################################
 
     toString: ->
         obj = if @item? then @item else @recipe
-        return "#{@evaluator}=>#{obj}@#{@baseScore}"
+        return "#{@evaluator.constructor.name}:#{obj}@#{@baseScore}<#{@_id}>"
 
     # Private Methods ##############################################################################
 

src/client/models/crafting/evaluator.coffee

@@ -34,8 +34,8 @@ module.exports = class Evaluator
 
             recipeEvaluation = @_findBestRecipeEvaluationFor item
             if recipeEvaluation?
-                evaluation.addBaseEvaluation recipeEvaluation
                 evaluation.baseScore = recipeEvaluation.baseScore
+                evaluation.addIncludedToolsFrom recipeEvaluation
             else
                 @_computeGatherableItemScore item, evaluation
 
@@ -49,12 +49,13 @@ module.exports = class Evaluator
             evaluation = @_evaluations[recipe.id] = new Evaluation evaluator:this, recipe:recipe
             @_computeRecipeScore recipe, evaluation
 
+            for id, item of recipe.inputs
+                inputEvaluation = @evaluateItem item
+                evaluation.addIncludedToolsFrom inputEvaluation
+
             for id, toolItem of recipe.tools
                 evaluation.addIncludedTool toolItem
-
-                for id, toolItem of @evaluateItem(toolItem).includedTools
-                    evaluation.addIncludedTool toolItem
-
+                evaluation.addIncludedToolsFrom @evaluateItem toolItem
 
         return evaluation
 
@@ -79,24 +80,23 @@ module.exports = class Evaluator
 
     # Overrideable Methods #########################################################################
 
-    _computeRecipeScore: (recipe, evaluation)->
-        throw new Error "#{@constructor.name} must override _computeRecipeScore"
-
     _computeGatherableItemScore: (item, evaluation)->
         throw new Error "#{@constructor.name} must override _computeGatherableItemScore"
 
+    _computeRecipeScore: (recipe, evaluation)->
+        throw new Error "#{@constructor.name} must override _computeRecipeScore"
+
     # Private Methods ##############################################################################
 
     _findBestRecipeEvaluationFor: (item)->
         return null if item.isGatherable
         result = null
 
-        for recipeMap in [item.recipes, item.recipesAsExtra]
-            for id, recipe of recipeMap
-                evaluation = @evaluateRecipe recipe
-                continue unless evaluation?.baseScore?
+        for id, recipe of item.recipes
+            evaluation = @evaluateRecipe recipe
+            continue unless evaluation?.baseScore?
 
-                if not result? then result = evaluation
-                if evaluation.baseScore < result.baseScore then result = evaluation
+            if not result? then result = evaluation
+            if evaluation.baseScore < result.baseScore then result = evaluation
 
         return result

src/client/models/crafting/inventory.coffee

@@ -1,90 +0,0 @@
-#
-# Crafting Guide - inventory.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-Stack = require './stack'
-
-########################################################################################################################
-
-module.exports = class Inventory
-
-    constructor: (inventory=null)->
-        @_id = _.uniqueId "inventory-"
-        @_stacks = {}
-
-        if inventory? then @merge inventory
-
-    # Properties ###################################################################################
-
-    Object.defineProperties @prototype,
-
-        isEmpty:
-            get: -> (id for id, stack of @_stacks).length is 0
-
-        stacks:
-            get: -> return @_stacks
-            set: -> throw new Error "stacks cannot be replaced"
-
-    # Public Methods ###############################################################################
-
-    add: (item, quantity)->
-        return unless item?
-        return if quantity is 0
-
-        existingStack = @_stacks[item.id]
-        if existingStack?
-            if existingStack.quantity + quantity < 0 then throw new Error "cannot have a negative quantity"
-            existingStack.quantity += quantity
-        else
-            if quantity < 0 then throw new Error "cannot have a negative quantity"
-            @_stacks[item.id] = new Stack item:item, quantity:quantity
-
-        if @_stacks[item.id].quantity is 0
-            delete @_stacks[item.id]
-
-    clear: ->
-        @_stacks = {}
-
-    contains: (item)->
-        return @_stacks[item.id]?
-
-    getQuantity: (item)->
-        existingStack = @_stacks[item.id]
-        return 0 unless existingStack?
-        return existingStack.quantity
-
-    merge: (inventory)->
-        for id, stack of inventory.stacks
-            @add stack.item, stack.quantity
-
-    remove: (item, quantity)->
-        @add item, -1 * quantity
-
-    # Object Overrides #############################################################################
-
-    toString: (options={})->
-        options.full ?= false
-
-        if options.full
-            result = []
-            needsDelimiter = false
-
-            stackList = (stack for itemId, stack of @_stacks)
-            stackList.sort (a, b)->
-                if a.item.displayName isnt b.item.displayName
-                    return if a.item.displayName < b.item.displayName then -1 else +1
-                return 0
-
-            for stack in stackList
-                if needsDelimiter then result.push ", "
-                needsDelimiter = true
-
-                result.push stack.quantity
-                result.push " "
-                result.push stack.item.displayName
-            return result.join ""
-        else
-            return "Inventory<#{@_id}>@#{(id for id, item of @_stacks).length}"

src/client/models/crafting/item.coffee

@@ -1,93 +0,0 @@
-#
-# Crafting Guide - item.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-########################################################################################################################
-
-module.exports = class Item
-
-    constructor: (attributes={})->
-        @id           = attributes.id
-        @displayName  = attributes.displayName
-        @isGatherable = attributes.isGatherable
-        @mod          = attributes.mod
-
-        @_hasPrimaryRecipe = false
-        @_recipesAsPrimary = {}
-        @_recipesAsExtra = {}
-
-    # Property Methods #############################################################################
-
-    Object.defineProperties @prototype,
-
-        displayName:
-            get: -> return @_displayName
-            set: (displayName)->
-                if not displayName? then throw new Error "displayName is required"
-                @_displayName = displayName
-
-        firstRecipe:
-            get: -> return recipe for id, recipe of @recipes
-            set: -> throw new Error "firstRecipe cannot be assigned"
-
-        id:
-            get: -> return @_id
-            set: (id)->
-                if not id? then throw new Error "id is required"
-                return if @_id is id
-                if @_id? then throw new Error "id cannot be reassigned"
-                @_id = id
-
-        isGatherable:
-            get: ->
-                return true if @_isGatherable is true
-                return false if (id for id, recipe of @_recipesAsPrimary).length > 0
-                return false if (id for id, recipe of @_recipesAsExtra).length > 0
-                return true
-            set: (isGatherable)->
-                @_isGatherable = null unless isGatherable?
-                @_isGatherable = !!isGatherable
-
-        mod:
-            get: -> return @_mod
-            set: (mod)->
-                if not mod? then throw new Error "mod is required"
-                if @_mod is mod then return
-                if @_mod? then throw new Error "mod cannot be reassigned"
-                @_mod = mod
-                @_mod.addItem this
-
-        modPack:
-            get: -> return @_mod.modPack
-            set: -> throw new Error "modPack cannot be replaced"
-
-        recipes:
-            get: -> return if @_hasPrimaryRecipe then @_recipesAsPrimary else @_recipesAsExtra
-            set: -> throw new Error "recipes cannot be assigned"
-
-        recipesAsPrimary:
-            get: -> return @_recipesAsPrimary
-            set: -> throw new Error "recipes cannot be assigned"
-
-        recipesAsExtra:
-            get: -> return @_recipesAsExtra
-            set: -> throw new Error "recipesAsExtra cannot be assigned"
-
-    # Public Recipes ###############################################################################
-
-    addRecipe: (recipe)->
-        if recipe.output.item is this
-            @_recipesAsPrimary[recipe.id] = recipe
-            @_hasPrimaryRecipe = true
-        else if recipe.extras[this.id] is this
-            @_recipesAsExtra[recipe.id] = recipe
-        else
-            throw new Error "recipe<#{recipe.id}> does not produce this item<#{@id}>"
-
-    # Object Overrides #############################################################################
-
-    toString: ->
-        return "Item:#{@displayName}<#{@id}>"

src/client/models/crafting/mod.coffee

@@ -1,62 +0,0 @@
-#
-# Crafting Guide - mod.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-########################################################################################################################
-
-module.exports = class Mod
-
-    constructor: (attributes={})->
-        @id = attributes.id
-        @displayName = attributes.displayName
-        @modPack = attributes.modPack
-
-        @_items = {}
-
-    # Properties ###################################################################################
-
-    Object.defineProperties @prototype,
-
-        displayName:
-            get: -> return @_displayName
-            set: (displayName)->
-                if not displayName? then throw new Error "displayName is required"
-                return if @_displayName is displayName
-                @_displayName = displayName
-
-        id:
-            get: -> return @_id
-            set: (id)->
-                if not id? then throw new Error "id is required"
-                return if @_id is id
-                if @_id? then throw new Error "id cannot be reassigned"
-                @_id = id
-
-        items:
-            get: -> return @_items
-            set: -> throw new Error "items cannot be replaced"
-
-        modPack:
-            get: -> return @_modPack
-            set: (modPack)->
-                if not modPack? then throw new Error "modPack is required"
-                if @_modPack is modPack then return
-                if @_modPack? then throw new Error "modPack cannot be reassigned"
-                @_modPack = modPack
-                @_modPack.addMod this
-
-    # Public Methods ###############################################################################
-
-    addItem: (item)->
-        if not item? then return
-        if @_items[item.id] is item then return
-        @_items[item.id] = item
-        item.mod = this
-
-    # Object Overrides #############################################################################
-
-    toString: ->
-        return "Mod:#{@displayName}<#{@id}>"

src/client/models/crafting/mod_pack.coffee

@@ -1,52 +0,0 @@
-#
-# Crafting Guide - mod_pack.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-########################################################################################################################
-
-module.exports = class ModPack
-
-    constructor: (attributes={})->
-        @id = attributes.id
-        @displayName = attributes.displayName
-
-        @_mods = {}
-        @_oreDict = {}
-
-    # Property Methods #############################################################################
-
-    Object.defineProperties @prototype,
-
-        displayName:
-            get: -> return @_displayName
-            set: (displayName)->
-                if not displayName? then throw new Error "displayName is required"
-                if @_displayName is displayName then return
-                @_displayName = displayName
-
-        id:
-            get: -> return @_id
-            set: (id)->
-                if not id? then throw new Error "id is required"
-                if @_id is id then return
-                if @_id? then throw new Error "id cannot be reassigned"
-
-        mods:
-            get: -> return @_mods
-            set: -> throw new Error "mods cannot be replaced"
-
-    # Public Methods ###############################################################################
-
-    addMod: (mod)->
-        if not mod? then return
-        if @_mods[mod.id] is mod then return
-        @_mods[mod.id] = mod
-        mod.modPack = this
-
-    # Object Overrides #############################################################################
-
-    toString: ->
-        return "ModPack:#{@displayName}<#{@id}>"

src/client/models/crafting/plan_builder.test.coffee

@@ -5,14 +5,14 @@
 # All rights reserved.
 #
 
-fixtures           = require './fixtures'
-Inventory          = require './inventory'
+fixtures           = require '../fixtures'
+Inventory          = require '../game/inventory'
 PlanBuilder        = require './plan_builder'
 ResourcesEvaluator = require './resources_evaluator'
 
 ########################################################################################################################
 
-describe.only "PlanBuilder", ->
+describe "PlanBuilder", ->
 
     beforeEach ->
         @planner = new PlanBuilder new ResourcesEvaluator

src/client/models/crafting/recipe.coffee

@@ -1,148 +0,0 @@
-#
-# Crafting Guide - recipe.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-{StringBuilder} = require 'crafting-guide-common'
-
-########################################################################################################################
-
-module.exports = class Recipe
-
-    constructor: (attributes={})->
-        @id     = attributes.id
-        @height = attributes.height
-        @output = attributes.output
-        @width  = attributes.width
-
-        @_extras    = {}
-        @_inputs    = {}
-        @_inputGrid = []
-        @_tools     = {}
-
-    # Properties ###################################################################################
-
-    Object.defineProperties @prototype,
-
-        allProducts: # an array of Stacks starting the the primary output of this recipe
-            get: -> return [].concat @output, (stack for id, stack of @extras)
-            set: -> throw new Error "allProducts cannot be assigned"
-
-        extras: # a hash of item id to Stack of all the non-primary outputs of this recipe
-            get: -> return @_extras
-            set: -> throw new Error "extras cannot be replaced"
-
-        id: # a string which uniquely identifies this recipe
-            get: -> return @_id
-            set: (id)->
-                if not id? then throw new Error "id is required"
-                if @_id is id then return
-                if @_id? then throw new Error "id cannot be reassigned"
-                @_id = id
-
-        height: # an integer specifying the number of rows needed by this recipe
-            get: -> return @_height
-            set: (height)->
-                height = parseInt "#{height}"
-                height = if Number.isNaN(height) then 0 else Math.max(0, height)
-                @_height = height
-
-        inputs: # a hash of item id to Item containing all the inputs to this recipe
-            get: -> return @_inputs
-            set: -> throw new Error "inputs cannot be replaced"
-
-        needsTools: # a boolean indicating whether this recipe requires a tool
-            get: -> return (id for id, toolItem of @_tools).length > 0
-
-        output: # a Stack specifying the primary output of this recipe
-            get: -> return @_output
-            set: (output)->
-                if not output? then throw new Error "output is required"
-                if @_output is output then return
-                if @_output? then throw new Error "output cannot be reassigned"
-                @_output = output
-                @_output.item.addRecipe this
-
-        modPack: # the ModPack to which this recipe belongs
-            get: -> return @_output.modPack
-            set: -> throw new Error "modPack cannot be replaced"
-
-        tools: # a hash of item id to Item of all the tools required for this recipe
-            get: -> return @_tools
-            set: -> throw new Error "tools cannot be assigned"
-
-        width: # an integer specifying the number of columns needed by this recipe
-            get: -> return @_width
-            set: (width)->
-                width = parseInt "#{width}"
-                width = if Number.isNaN(width) then 0 else Math.max(0, width)
-                @_width = width
-
-    # Public Methods ###############################################################################
-
-    addExtra: (stack)->
-        return unless stack
-        @_extras[stack.item.id] = stack
-
-    addTool: (item)->
-        return unless item
-        @_tools[item.id] = item
-
-    computeQuantityRequired: (item)->
-        result = 0
-
-        for row in [0...@height]
-            for col in [0...@width]
-                stack = @_inputGrid[row]?[col]
-                continue unless stack?
-                continue unless stack.item.id is item.id
-                result += stack.quantity
-
-        return result
-
-    computeQuantityProduced: (item)->
-        result = 0
-
-        if @_output.item.id is item.id
-            result += @_output.quantity
-
-        for itemId, stack of @_extras
-            continue unless itemId is item.id
-            result += stack.quantity
-
-        return result
-
-    getInputAt: (row, col)->
-        return @_inputGrid[row]?[col]
-
-    setInputAt: (row, col, stack)->
-        @_height = Math.max @_height, row + 1
-        @_width = Math.max @_width, col + 1
-
-        @_inputGrid[row] ?= []
-        @_inputGrid[row][col] = stack
-        @_inputs[stack.item.id] = stack.item
-
-    # Object Overrides #############################################################################
-
-    toString: (options={})->
-        options.full ?= false
-
-        if options.full
-            b = new StringBuilder
-            b.loop (item for id, item of @inputs), delimiter:" + ", onEach:(b, item)=>
-                b.push @computeQuantityRequired(item), " ", item.displayName
-            b.push " ="
-            b.onlyIf @needsTools, (b)=>
-                b.push "("
-                b.loop (toolItem for id, toolItem of @tools), onEach:(b, toolItem)-> b.push toolItem.displayName
-                b.push ")"
-            b.push "=> "
-            b.loop @allProducts, delimiter:" + ", onEach:(b, stack)=>
-                b.push stack.quantity, " ", stack.item.displayName
-
-            return b.toString()
-        else
-            return "Recipe:#{@output}<#{@id}>"

src/client/models/crafting/resources_evaluator.coffee

@@ -16,29 +16,24 @@ module.exports = class ResourcesEvaluator extends Evaluator
     _computeRecipeScore: (recipe, evaluation)->
         evaluation.baseScore = 0
 
-        for row in [0...recipe.height]
-            for col in [0...recipe.width]
-                stack = recipe.getInputAt row, col
-                continue unless stack?
+        for x in [0...recipe.width]
+            for y in [0...recipe.height]
+                for z in [0...recipe.depth]
+                    stack = recipe.getInputAt x, y, z
+                    continue unless stack?
 
-                inputEvaluation = @evaluateItem stack.item
-                if inputEvaluation?.baseScore?
-                    evaluation.baseScore += inputEvaluation.baseScore * stack.quantity
-                    evaluation.addBaseEvaluation inputEvaluation
-                else
-                    evaluation.baseScore = null
-                    logger.outdent()
-                    return
+                    inputEvaluation = @evaluateItem stack.item
+                    if inputEvaluation?.baseScore?
+                        evaluation.baseScore += inputEvaluation.baseScore * stack.quantity
+                    else
+                        evaluation.baseScore = null
+                        return
 
         for id, extraStack of recipe.extras
             extraEvaluation = @evaluateItem extraStack.item
             continue unless extraEvaluation?.baseScore?
             evaluation.baseScore -= extraStack.quantity * extraEvaluation.baseScore
 
-        for id, toolItem of recipe.tools
-            toolEvaluation = @evaluateItem toolItem
-            evaluation.addBaseEvaluation toolEvaluation
-
         evaluation.baseScore = evaluation.baseScore / recipe.output.quantity
 
     _computeGatherableItemScore: (item, evaluation)->

src/client/models/crafting/resources_evaluator.test.coffee

@@ -6,7 +6,7 @@
 #
 
 ResourcesEvaluator = require './resources_evaluator'
-fixtures           = require './fixtures'
+fixtures           = require '../fixtures'
 
 ########################################################################################################################
 
@@ -123,3 +123,7 @@ describe "ResourcesEvaluator", ->
             #    1 oak wood ==> 4 oak planks (0.25)
             #    4 planks ==> 1 crafting table (1)
             @evaluation.computeTotalScore().should.equal 18
+
+    describe 'evaluating a recipe which is only ever made as an extra', ->
+
+        it 'should still be able to come up with an evaluation'

src/client/models/crafting/stack.coffee

@@ -1,42 +0,0 @@
-#
-# Crafting Guide - stack.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-########################################################################################################################
-
-module.exports = class Stack
-
-    constructor: (attributes={})->
-        @item = attributes.item
-        @quantity = attributes.quantity
-
-    # Properties ###################################################################################
-
-    Object.defineProperties @prototype,
-
-        item:
-            get: -> return @_item
-            set: (item)->
-                if not item? then throw new Error "item is required"
-                if @_item is item then return
-                if @_item? then throw new Error "item cannot be reassigned"
-                @_item = item
-
-        modPack:
-            get: -> return @_item.modPack
-            set: -> throw new Error "modPack cannot be replaced"
-
-        quantity:
-            get: -> return @_quantity
-            set: (quantity)->
-                quantity = parseInt "#{quantity}"
-                quantity = if Number.isNaN(quantity) then 0 else Math.max(0, quantity)
-                @_quantity = quantity
-
-    # Object Overrides #############################################################################
-
-    toString: ->
-        return "Stack:#{@item}×#{@quantity}"

src/client/models/crafting/steps_evaluator.coffee

@@ -22,7 +22,6 @@ module.exports = class StepsEvaluator extends Evaluator
                 evaluation.score = null
                 return
 
-            evaluation.addBaseEvaluation inputEvaluation
             evaluation.score = Math.min evaluation.score, inputEvaluation.score + 1
 
         for id, item of recipe.tools
@@ -33,7 +32,6 @@ module.exports = class StepsEvaluator extends Evaluator
                 evaluation.score = null
                 return
 
-            evaluation.addBaseEvaluation evaluation
             evaluation.addIncludedTool item
             evaluation.score += toolEvaluation.score
 

src/client/models/fixtures.coffee

@@ -5,11 +5,11 @@
 # All rights reserved.
 #
 
-Item    = require "./item"
-Mod     = require "./mod"
-ModPack = require "./mod_pack"
-Recipe  = require "./recipe"
-Stack   = require "./stack"
+Item    = require "./game/item"
+Mod     = require "./game/mod"
+ModPack = require "./game/mod_pack"
+Recipe  = require "./game/recipe"
+Stack   = require "./game/stack"
 
 # Instance Creation Fixtures ###########################################################################################
 
@@ -43,7 +43,7 @@ exports.createStack = createStack = (attributes={})->
 # Item Configuration Fixtures ##########################################################################################
 
 exports.configureBucket = configureBucket = (mod)->
-    bucket = mod.items["bucket"]
+    bucket = mod.modPack.findItem "bucket"
     if not bucket?
         ironIngot     = configureIronIngot mod
         bucket        = createItem mod:mod, id:"bucket", displayName:"Bucket"
@@ -52,13 +52,13 @@ exports.configureBucket = configureBucket = (mod)->
         recipe = createRecipe output:createStack item:bucket
         recipe.setInputAt 0, 0, createStack item:ironIngot
         recipe.setInputAt 1, 1, createStack item:ironIngot
-        recipe.setInputAt 0, 2, createStack item:ironIngot
+        recipe.setInputAt 2, 0, createStack item:ironIngot
         recipe.addTool craftingTable
 
     return bucket
 
 exports.configureCake = configureCake = (mod)->
-    cake = mod.items["cake"]
+    cake = mod.modPack.findItem "cake"
     if not cake?
         bucket        = configureBucket mod
         cake          = createItem mod:mod, id:"cake", displayName:"Cake"
@@ -70,13 +70,13 @@ exports.configureCake = configureCake = (mod)->
 
         recipe = createRecipe output:createStack item:cake
         recipe.setInputAt 0, 0, createStack item:milkBucket
-        recipe.setInputAt 0, 1, createStack item:milkBucket
-        recipe.setInputAt 0, 2, createStack item:milkBucket
-        recipe.setInputAt 1, 0, createStack item:sugar
+        recipe.setInputAt 1, 0, createStack item:milkBucket
+        recipe.setInputAt 2, 0, createStack item:milkBucket
+        recipe.setInputAt 0, 1, createStack item:sugar
         recipe.setInputAt 1, 1, createStack item:egg
-        recipe.setInputAt 1, 2, createStack item:sugar
-        recipe.setInputAt 2, 0, createStack item:wheat
-        recipe.setInputAt 2, 1, createStack item:wheat
+        recipe.setInputAt 2, 1, createStack item:sugar
+        recipe.setInputAt 0, 2, createStack item:wheat
+        recipe.setInputAt 1, 2, createStack item:wheat
         recipe.setInputAt 2, 2, createStack item:wheat
         recipe.addTool craftingTable
         recipe.addExtra createStack item:bucket, quantity:3
@@ -84,39 +84,39 @@ exports.configureCake = configureCake = (mod)->
     return cake
 
 exports.configureCoal = configureCoal = (mod)->
-    coal = mod.items["coal"]
+    coal = mod.modPack.findItem "coal"
     if not coal?
-        coal = createItem mod:mod, id:"coal", displayName:"Coal", isGatherable:true
+        coal = createItem mod:mod, id:"coal", displayName:"Coal"
     return coal
 
 exports.configureCobblestone = configureCobblestone = (mod)->
-    cobblestone = mod.items["cobblestone"]
+    cobblestone = mod.modPack.findItem "cobblestone"
     if not cobblestone?
-        cobblestone = createItem mod:mod, displayName:"Cobblestone", isGatherable:true
+        cobblestone = createItem mod:mod, displayName:"Cobblestone"
     return cobblestone
 
 exports.configureCraftingTable = configureCraftingTable = (mod)->
-    craftingTable = mod.items["crafting_table"]
+    craftingTable = mod.modPack.findItem "crafting_table"
     if not craftingTable?
         craftingTable = createItem mod:mod, id:"crafting_table", displayName:"Crafting Table"
         oakPlanks     = configureOakPlank mod
 
         recipe = createRecipe output:createStack item:craftingTable
         recipe.setInputAt 0, 0, createStack item:oakPlanks
-        recipe.setInputAt 0, 1, createStack item:oakPlanks
         recipe.setInputAt 1, 0, createStack item:oakPlanks
+        recipe.setInputAt 0, 1, createStack item:oakPlanks
         recipe.setInputAt 1, 1, createStack item:oakPlanks
 
     return craftingTable
 
 exports.configureEgg = configureEgg = (mod)->
-    egg = mod.items["egg"]
+    egg = mod.modPack.findItem "egg"
     if not egg?
-        egg = createItem mod:mod, id:"egg", displayName:"Egg", isGatherable:true
+        egg = createItem mod:mod, id:"egg", displayName:"Egg"
     return egg
 
 exports.configureFurnace = configureFurnace = (mod)->
-    furnace = mod.items["furnace"]
+    furnace = mod.modPack.findItem "furnace"
     if not furnace?
         cobblestone   = configureCobblestone mod
         craftingTable = configureCraftingTable mod
@@ -124,19 +124,19 @@ exports.configureFurnace = configureFurnace = (mod)->
 
         recipe = createRecipe output:createStack item:furnace
         recipe.setInputAt 0, 0, createStack item:cobblestone
-        recipe.setInputAt 0, 1, createStack item:cobblestone
-        recipe.setInputAt 0, 2, createStack item:cobblestone
         recipe.setInputAt 1, 0, createStack item:cobblestone
-        recipe.setInputAt 1, 2, createStack item:cobblestone
         recipe.setInputAt 2, 0, createStack item:cobblestone
+        recipe.setInputAt 0, 1, createStack item:cobblestone
         recipe.setInputAt 2, 1, createStack item:cobblestone
+        recipe.setInputAt 0, 2, createStack item:cobblestone
+        recipe.setInputAt 1, 2, createStack item:cobblestone
         recipe.setInputAt 2, 2, createStack item:cobblestone
         recipe.addTool craftingTable
 
     return furnace
 
 exports.configureIronIngot = configureIronIngot = (mod)->
-    ironIngot = mod.items["iron_ingot"]
+    ironIngot = mod.modPack.findItem "iron_ingot"
     if not ironIngot?
         coal      = configureCoal mod
         furnace   = configureFurnace mod
@@ -144,23 +144,23 @@ exports.configureIronIngot = configureIronIngot = (mod)->
         ironOre   = configureIronOre mod
 
         recipe = createRecipe output:createStack item:ironIngot, quantity:8
-        recipe.setInputAt 0, 1, createStack item:ironOre, quantity:8
-        recipe.setInputAt 2, 1, createStack item:coal
+        recipe.setInputAt 1, 0, createStack item:ironOre, quantity:8
+        recipe.setInputAt 1, 2, createStack item:coal
         recipe.addTool furnace
 
     return ironIngot
 
 exports.configureIronBlock = configureIronBlock = (mod)->
-    ironBlock = mod.items["iron_block"]
+    ironBlock = mod.modPack.findItem "iron_block"
     if not ironBlock?
         craftingTable = configureCraftingTable mod
         ironBlock = createItem mod:mod, id:"iron_block", displayName:"Iron Block"
         ironIngot = configureIronIngot mod
 
         recipe = createRecipe output:createStack item:ironBlock
-        for row in [0..2]
-            for col in [0..2]
-                recipe.setInputAt row, col, createStack item:ironIngot
+        for x in [0..2]
+            for y in [0..2]
+                recipe.setInputAt x, y, createStack item:ironIngot
         recipe.addTool craftingTable
 
         recipe = createRecipe output:createStack item:ironIngot, quantity:9
@@ -169,7 +169,7 @@ exports.configureIronBlock = configureIronBlock = (mod)->
     return ironBlock
 
 exports.configureIronSword = configureIronSword = (mod)->
-    ironSword = mod.items["iron_sword"]
+    ironSword = mod.modPack.findItem "iron_sword"
     if not ironSword?
         craftingTable = configureCraftingTable mod
         ironIngot     = configureIronIngot mod
@@ -177,15 +177,15 @@ exports.configureIronSword = configureIronSword = (mod)->
         stick         = configureStick mod
 
         recipe = createRecipe output:createStack item:ironSword
-        recipe.setInputAt 0, 1, createStack item:ironIngot
+        recipe.setInputAt 1, 0, createStack item:ironIngot
         recipe.setInputAt 1, 1, createStack item:ironIngot
-        recipe.setInputAt 2, 1, createStack item:stick
+        recipe.setInputAt 1, 2, createStack item:stick
         recipe.addTool craftingTable
 
     return ironSword
 
 exports.configureIronShovel = configureIronShovel = (mod)->
-    ironShovel = mod.items["iron_shovel"]
+    ironShovel = mod.modPack.findItem "iron_shovel"
     if not ironShovel?
         craftingTable = configureCraftingTable mod
         ironIngot     = configureIronIngot mod
@@ -193,40 +193,40 @@ exports.configureIronShovel = configureIronShovel = (mod)->
         stick         = configureStick mod
 
         recipe = createRecipe output:createStack item:ironShovel
-        recipe.setInputAt 0, 1, createStack item:ironIngot
+        recipe.setInputAt 1, 0, createStack item:ironIngot
         recipe.setInputAt 1, 1, createStack item:stick
-        recipe.setInputAt 2, 1, createStack item:stick
+        recipe.setInputAt 1, 2, createStack item:stick
         recipe.addTool craftingTable
 
     return ironShovel
 
 exports.configureIronOre = configureIronOre = (mod)->
-    ironOre = mod.items["iron_ore"]
+    ironOre = mod.modPack.findItem "iron_ore"
     if not ironOre?
-        ironOre = createItem mod:mod, id:"iron_ore", displayName:"Iron Ore", isGatherable:true
+        ironOre = createItem mod:mod, id:"iron_ore", displayName:"Iron Ore"
     return ironOre
 
 exports.configureMilk = configureMilk = (mod)->
-    milk = mod.items["milk"]
+    milk = mod.modPack.findItem "milk"
     if not milk?
-        milk = createItem mod:mod, id:"milk", displayName:"Milk", isGatherable:true
+        milk = createItem mod:mod, id:"milk", displayName:"Milk"
     return milk
 
 exports.configureMilkBucket = configureMilkBucket = (mod)->
-    milkBucket = mod.items["milk_bucket"]
+    milkBucket = mod.modPack.findItem "milk_bucket"
     if not milkBucket?
         bucket     = configureBucket mod
         milk       = configureMilk mod
         milkBucket = createItem mod:mod, id:"milkBucket", displayName:"Milk Bucket"
 
         recipe = createRecipe output:createStack item:milkBucket
-        recipe.setInputAt 0, 1, createStack item:milk
+        recipe.setInputAt 1, 0, createStack item:milk
         recipe.setInputAt 1, 1, createStack item:bucket
 
     return milkBucket
 
 exports.configureOakPlank = configureOakPlank = (mod)->
-    oakPlanks = mod.items["oak_planks"]
+    oakPlanks = mod.modPack.findItem "oak_planks"
     if not oakPlanks?
         oakPlanks = createItem mod:mod, id:"oak_planks", displayName:"Oak Planks"
         oakWood   = configureOakWood mod
@@ -237,31 +237,37 @@ exports.configureOakPlank = configureOakPlank = (mod)->
     return oakPlanks
 
 exports.configureOakWood = configureOakWood = (mod)->
-    oakWood = mod.items["oak_wood"]
+    oakWood = mod.modPack.findItem "oak_wood"
     if not oakWood?
-        oakWood = createItem mod:mod, id:"oak_wood", displayName:"Oak Wood", isGatherable:true
+        oakWood = createItem mod:mod, id:"oak_wood", displayName:"Oak Wood"
     return oakWood
 
+exports.configureObsidian = configureObsidian = (mod)->
+    obsidian = mod.modPack.findItem "obsidian"
+    if not obsidian?
+        obsidian = createItem mod:mod, id:"obsidian", displayName:"Obsidian"
+    return obsidian
+
 exports.configureRedstoneDust = configureRedstoneDust = (mod)->
-    redstoneDust = mod.items["redstone_dust"]
+    redstoneDust = mod.modPack.findItem "redstone_dust"
     if not redstoneDust?
-        redstoneDust = createItem mod:mod, id:"redstone_dust", displayName:"Redstone Dust", isGatherable:true
+        redstoneDust = createItem mod:mod, id:"redstone_dust", displayName:"Redstone Dust"
     return redstoneDust
 
 exports.configureStick = configureStick = (mod)->
-    stick = mod.items["stick"]
+    stick = mod.modPack.findItem "stick"
     if not stick?
         oakPlanks = configureOakPlank mod
         stick     = createItem mod:mod, id:"stick", displayName:"Stick"
 
         recipe = createRecipe output:createStack item:stick, quantity:4
         recipe.setInputAt 0, 0, createStack item:oakPlanks
-        recipe.setInputAt 1, 0, createStack item:oakPlanks
+        recipe.setInputAt 0, 1, createStack item:oakPlanks
 
     return stick
 
 exports.configureSugar = configureSugar = (mod)->
-    sugar = mod.items["sugar"]
+    sugar = mod.modPack.findItem "sugar"
     if not sugar?
         sugar     = createItem mod:mod, id:"sugar", displayName:"Sugar"
         sugarCane = configureSugarCane mod
@@ -272,7 +278,7 @@ exports.configureSugar = configureSugar = (mod)->
     return sugar
 
 exports.configureSaw = configureSaw = (mod)->
-    saw = mod.items["saw"]
+    saw = mod.modPack.findItem "saw"
     if not saw?
         craftingTable = configureCraftingTable mod
         ironBlock     = configureIronBlock mod
@@ -284,13 +290,13 @@ exports.configureSaw = configureSaw = (mod)->
 
         recipe = createRecipe output:createStack item:saw
         recipe.setInputAt 0, 0, createStack item:oakPlank
-        recipe.setInputAt 0, 1, createStack item:ironIngot
-        recipe.setInputAt 0, 2, createStack item:oakPlank
-        recipe.setInputAt 1, 0, createStack item:oakPlank
-        recipe.setInputAt 1, 1, createStack item:ironBlock
-        recipe.setInputAt 1, 2, createStack item:oakPlank
+        recipe.setInputAt 1, 0, createStack item:ironIngot
         recipe.setInputAt 2, 0, createStack item:oakPlank
-        recipe.setInputAt 2, 1, createStack item:redstoneDust
+        recipe.setInputAt 0, 1, createStack item:oakPlank
+        recipe.setInputAt 1, 1, createStack item:ironBlock
+        recipe.setInputAt 2, 1, createStack item:oakPlank
+        recipe.setInputAt 0, 2, createStack item:oakPlank
+        recipe.setInputAt 1, 2, createStack item:redstoneDust
         recipe.setInputAt 2, 2, createStack item:oakPlank
         recipe.addTool craftingTable
 
@@ -301,13 +307,13 @@ exports.configureSaw = configureSaw = (mod)->
     return saw
 
 exports.configureSugarCane = configureSugarCane = (mod)->
-    sugarCane = mod.items["sugar_cane"]
+    sugarCane = mod.modPack.findItem "sugar_cane"
     if not sugarCane?
-        sugarCane = createItem mod:mod, id:"sugar_cane", displayName:"Sugar Cane", isGatherable:true
+        sugarCane = createItem mod:mod, id:"sugar_cane", displayName:"Sugar Cane"
     return sugarCane
 
 exports.configureWheat = configureWheat = (mod)->
-    wheat = mod.items["wheat"]
+    wheat = mod.modPack.findItem "wheat"
     if not wheat?
-        wheat = createItem mod:mod, id:"wheat", displayName:"Wheat", isGatherable:true
+        wheat = createItem mod:mod, id:"wheat", displayName:"Wheat"
     return wheat

src/client/models/game/inventory.coffee

@@ -5,239 +5,86 @@
 # All rights reserved.
 #
 
-BaseModel = require '../base_model'
-ItemSlug  = require './item_slug'
-Stack     = require './stack'
+Stack = require './stack'
 
 ########################################################################################################################
 
-module.exports = class Inventory extends BaseModel
+module.exports = class Inventory
 
-    constructor: (attributes={}, options={})->
-        super attributes, options
-        attributes.modPack ?= null
-        @clear()
+    constructor: (inventory=null)->
+        @_id = _.uniqueId "inventory-"
+        @_stacks = {}
 
-        if options.clone?
-            @addInventory options.clone
+        if inventory? then @merge inventory
 
-    # Class Methods ################################################################################
+    # Properties ###################################################################################
 
-    @Delimiters =
-        Item: '.'
-        Stack: ':'
+    Object.defineProperties @prototype,
+
+        isEmpty:
+            get: -> (id for id, stack of @_stacks).length is 0
+
+        stacks:
+            get: -> return @_stacks
+            set: -> throw new Error "stacks cannot be replaced"
 
     # Public Methods ###############################################################################
 
-    add: (itemSlug, quantity=1, options={})->
-        return this unless quantity > 0
+    add: (item, quantity)->
+        return unless item?
+        return if quantity is 0
 
-        @_add itemSlug, quantity, options
-        @trigger c.event.add, this, itemSlug, quantity
-        @trigger c.event.change, this
-        return this
+        existingStack = @_stacks[item.id]
+        if existingStack?
+            if existingStack.quantity + quantity < 0 then throw new Error "cannot have a negative quantity"
+            existingStack.quantity += quantity
+        else
+            if quantity < 0 then throw new Error "cannot have a negative quantity"
+            @_stacks[item.id] = new Stack item:item, quantity:quantity
 
-    addInventory: (inventory)->
-        inventory.each (stack)=> @_add stack.itemSlug, stack.quantity
+        if @_stacks[item.id].quantity is 0
+            delete @_stacks[item.id]
 
-        @trigger c.event.change, this
-        return this
-
-    clear: (options={})->
+    clear: ->
         @_stacks = {}
-        @_itemSlugs = []
 
-        @trigger c.event.change, this
+    contains: (item)->
+        return @_stacks[item.id]?
 
-    clone: ->
-        inventory = new Inventory
-        inventory.addInventory this
-        return inventory
+    getQuantity: (item)->
+        existingStack = @_stacks[item.id]
+        return 0 unless existingStack?
+        return existingStack.quantity
 
-    each: (callback)->
-        for itemSlug in @_itemSlugs
-            stack = @_stacks[itemSlug]
-            continue unless stack?
-            callback stack
+    merge: (inventory)->
+        for id, stack of inventory.stacks
+            @add stack.item, stack.quantity
 
-    getSlugs: ->
-        return @_itemSlugs[..]
-
-    hasAtLeast: (itemSlug, quantity=1)->
-        if quantity is 0 then return true
-
-        stack = @_stacks[itemSlug]
-        return false unless stack?
-        return stack.quantity >= quantity
-
-    localize: ->
-        if not @modPack? then throw new Error 'localize requires @modPack'
-
-        changed = false
-        newSlugs = []
-        newStacks = []
-        for itemSlug in @_itemSlugs
-            stack = @_stacks[itemSlug]
-            continue unless stack?
-
-            qualifiedSlug = if itemSlug.isQualified then itemSlug else null
-            if not qualifiedSlug?
-                qualifiedSlug = @modPack.findItem(itemSlug)?.slug
-                changed = qualifiedSlug?
-
-            if qualifiedSlug?
-                newSlugs.push qualifiedSlug
-                newStacks.push new Stack itemSlug:qualifiedSlug, quantity:stack.quantity
-            else
-                newSlugs.push itemSlug
-                newStacks.push stack
-
-        if changed
-            for itemSlug, stack of @_stacks
-                @stopListening stack
-
-            @_itemSlugs = newSlugs
-            @_stacks = {}
-            for stack in newStacks
-                @_stacks[stack.itemSlug] = stack
-                @listenTo stack, c.event.change, => @trigger c.event.change, this
-
-            @_sort()
-            @trigger c.event.change, this
-
-    pop: ->
-        itemSlug = @_itemSlugs.pop()
-        return null unless itemSlug?
-
-        stack = @_stacks[itemSlug]
-        delete @_stacks[itemSlug]
-
-        @trigger c.event.remove, this, stack.itemSlug, stack.quantity
-        @trigger c.event.change, this
-        return stack
-
-    quantityOf: (itemSlug)->
-        stack = @_stacks[itemSlug]
-        return stack.quantity if stack
-        return 0
-
-    remove: (itemSlug, quantity=null)->
-        stack = @_stacks[itemSlug]
-        return this unless stack?
-
-        quantity ?= stack.quantity
-        return this unless quantity > 0
-
-        if stack.quantity < quantity
-            throw new Error "cannot remove #{quantity}: only #{stack.quantity} #{itemSlug} in this inventory"
-
-        stack.quantity -= quantity
-        if stack.quantity is 0
-            @stopListening stack
-            delete @_stacks[itemSlug]
-            @_itemSlugs = (s for s in @_itemSlugs when not ItemSlug.equal(s, itemSlug))
-
-        @trigger c.event.remove, this, itemSlug, quantity
-        @trigger c.event.change, this
-        return this
-
-    toDescription: ->
-        return null if @isEmpty
-        return null unless @modPack?
-
-        item = @modPack.findItem @_itemSlugs[0]
-        extras = @_itemSlugs.length - 1
-
-        result = "#{item.name}"
-        if extras > 0 then result += " and #{extras} more..."
-
-        return result
-
-    # Parsing Methods ##############################################################################
-
-    parse: (data)->
-        return this if not data? or data.length is 0
-
-        stacks = data.split Inventory.Delimiters.Stack
-        for stackText in stacks
-            stackParts = stackText.split Inventory.Delimiters.Item
-            if stackParts.length is 2
-                quantity = parseInt stackParts[0], 10
-                itemSlug = ItemSlug.slugify stackParts[1]
-            else if stackParts.length is 1
-                quantity = 1
-                itemSlug = ItemSlug.slugify stackParts[0]
-            else
-                throw new Error "expected #{stackText} to have 0 or 1 parts"
-
-            if itemSlug.qualified.length > 0
-                @add itemSlug, quantity
-
-        return this
-
-    unparse: (options={})->
-        parts = []
-        @each (stack)=>
-            slugText = stack.itemSlug.item
-            if @modPack?
-                item = @modPack.findItem ItemSlug.slugify slugText
-                if item? and item.slug.qualified isnt stack.itemSlug.qualified
-                    slugText = stack.itemSlug.qualified
-
-            if stack.quantity is 1
-                parts.push slugText
-            else
-                parts.push "#{stack.quantity}#{Inventory.Delimiters.Item}#{slugText}"
-
-        return parts.join Inventory.Delimiters.Stack
-
-    # Property Methods #############################################################################
-
-    Object.defineProperties @prototype,
-        isEmpty:
-            get: -> @_itemSlugs.length is 0
-
-        totalQuantity:
-            get: ->
-                total = 0
-                @each (stack)->
-                    total += stack.quantity
-                return total
+    remove: (item, quantity)->
+        @add item, -1 * quantity
 
     # Object Overrides #############################################################################
 
-    toString: ->
-        result = [@constructor.name, " (", @cid, ") {items: ["]
+    toString: (options={})->
+        options.full ?= false
 
-        needsDelimiter = false
-        @each (stack)->
-            if needsDelimiter then result.push ', '
-            result.push stack.toString()
-            needsDelimiter = true
-        result.push ']'
+        if options.full
+            result = []
+            needsDelimiter = false
 
-        result.push '}'
-        return result.join ''
+            stackList = (stack for itemId, stack of @_stacks)
+            stackList.sort (a, b)->
+                if a.item.displayName isnt b.item.displayName
+                    return if a.item.displayName < b.item.displayName then -1 else +1
+                return 0
 
-    # Private Methods ##############################################################################
+            for stack in stackList
+                if needsDelimiter then result.push ", "
+                needsDelimiter = true
 
-    _add: (itemSlug, quantity=1, options={})->
-        options.insert ?= false
-        return unless itemSlug?
-        return unless quantity > 0
-
-        stack = @_stacks[itemSlug]
-        if not stack?
-            stack = new Stack itemSlug:itemSlug, quantity:quantity
-            @listenTo stack, c.event.change, => @trigger c.event.change, this
-            @_stacks[itemSlug] = stack
-            if options.insert
-                @_itemSlugs.unshift itemSlug
-            else
-                @_itemSlugs.push itemSlug
-            @_sort()
+                result.push stack.quantity
+                result.push " "
+                result.push stack.item.displayName
+            return result.join ""
         else
-            stack.quantity += quantity
-
-    _sort: ->
-        @_itemSlugs.sort (a, b)-> ItemSlug.compare a, b
+            return "Inventory<#{@_id}>@#{(id for id, item of @_stacks).length}"

src/client/models/game/inventory.test.coffee

@@ -1,213 +0,0 @@
-#
-# Crafting Guide - inventory.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-EventRecorder = require '../event_recorder'
-Inventory     = require './inventory'
-Item          = require './item'
-ItemSlug      = require './item_slug'
-
-########################################################################################################################
-
-inventory = modPack = null
-
-########################################################################################################################
-
-describe 'inventory.coffee', ->
-
-    beforeEach ->
-        inventory = new Inventory {}, silent:false
-        inventory.add ItemSlug.slugify('wool'), 4
-        inventory.add ItemSlug.slugify('string'), 20
-        inventory.add ItemSlug.slugify('boat')
-
-    describe 'add', ->
-
-        it 'can add to an empty inventory', ->
-            inventory.add ItemSlug.slugify('iron_ingot'), 4
-            stack = inventory._stacks['iron_ingot']
-            stack.constructor.name.should.equal 'Stack'
-            stack.itemSlug.qualified.should.equal 'iron_ingot'
-            stack.quantity.should.equal 4
-
-        it 'can augment quantity of existing items', ->
-            inventory.add ItemSlug.slugify('wool'), 2
-            inventory.unparse().should.equal 'boat:20.string:6.wool'
-
-        it 'can add zero quantity', ->
-            inventory.add ItemSlug.slugify('wool'), 0
-            inventory.unparse().should.equal 'boat:20.string:4.wool'
-
-        it 'emits the proper events', ->
-            events = new EventRecorder inventory
-            inventory.add ItemSlug.slugify('iron_ingot'), 10
-            events.names.should.eql [c.event.add, c.event.change]
-
-    describe 'addInventory', ->
-
-        it 'can add to an empty inventory', ->
-            newInventory = new Inventory
-            newInventory.addInventory inventory
-            newInventory.unparse().should.equal 'boat:20.string:4.wool'
-
-        it 'can add a mix of new and existing items', ->
-            newInventory = new Inventory
-            newInventory.add ItemSlug.slugify('string'), 2
-            newInventory.addInventory inventory
-            newInventory.unparse().should.equal 'boat:22.string:4.wool'
-
-    describe 'clone', ->
-
-        it 'creates an empty inventory from an empty inventory', ->
-            a = new Inventory
-            b = a.clone()
-            b._itemSlugs.should.eql []
-
-        it 'faithfully copies an existing inventory', ->
-            copy = inventory.clone()
-            copy.unparse().should.equal 'boat:20.string:4.wool'
-
-    describe 'each', ->
-
-        it 'works with an empty inventory', ->
-            inventory = new Inventory
-            result = []
-            inventory.each (item)-> result.push item.name
-            result.should.eql []
-
-        it 'works when items have only been added', ->
-            result = []
-            inventory.each (stack)-> result.push stack.itemSlug.qualified
-            result.should.eql ['boat', 'string', 'wool']
-
-        it 'works when items have been augmented', ->
-            inventory.add ItemSlug.slugify 'iron_ingot'
-            inventory.add ItemSlug.slugify 'boat'
-            inventory.add ItemSlug.slugify('wool'), 2
-
-            result = []
-            inventory.each (stack)-> result.push stack.itemSlug.qualified
-            result.should.eql ['boat', 'iron_ingot', 'string', 'wool']
-
-    describe 'hasAtLeast', ->
-
-        it 'works when the item is completely absent', ->
-            answer = inventory.hasAtLeast 'chicken', 1
-            answer.should.be.false
-
-        it 'always returns true for zero quantity', ->
-            inventory.hasAtLeast('chicken', 0).should.be.true
-            inventory.hasAtLeast('wool', 0).should.be.true
-
-        it 'works for a quantity above 1', ->
-            inventory.hasAtLeast('wool', 3).should.be.true
-            inventory.hasAtLeast('wool', 4).should.be.true
-            inventory.hasAtLeast('wool', 5).should.be.false
-
-    describe 'localize', ->
-
-        before ->
-            modPack =
-                modSlug:
-                    wool:       'minecraft'
-                    string:     'minecraft'
-                    boat:       'minecraft'
-                    stone_gear: 'buildcraft'
-                findItem: (slug)->
-                    return slug:new ItemSlug @modSlug[slug.item], slug.item
-
-        it 'replaces item slugs with qualified slugs', ->
-            inventory.add ItemSlug.slugify 'stone_gear'
-            inventory.modPack = modPack
-            inventory.localize()
-
-            slugs = []
-            inventory.each (stack)-> slugs.push stack.itemSlug.qualified
-            slugs.should.eql [
-                'minecraft__boat'
-                'buildcraft__stone_gear'
-                'minecraft__string'
-                'minecraft__wool'
-            ]
-
-        it 'ignores qualified slugs', ->
-            inventory.add ItemSlug.slugify 'buildcraft__stone_gear'
-            inventory.modPack = modPack
-            inventory.localize()
-
-            slugs = []
-            inventory.each (stack)-> slugs.push stack.itemSlug.qualified
-            slugs.should.eql [
-                'minecraft__boat'
-                'buildcraft__stone_gear'
-                'minecraft__string'
-                'minecraft__wool'
-            ]
-
-    describe 'parse', ->
-
-        beforeEach ->
-            inventory = new Inventory {}, silent:false
-
-        it 'ignores an empty string', ->
-            result = inventory.parse ''
-            result.unparse().should.eql ''
-
-        it 'can parse a single item without quantity', ->
-            result = inventory.parse 'wool'
-            result.unparse().should.equal 'wool'
-
-        it 'can parse a single item with quantity', ->
-            result = inventory.parse '4.wool'
-            result.unparse().should.equal '4.wool'
-
-        it 'can parse multiple mixed-type items', ->
-            result = inventory.parse '4.wool:10.string:boat'
-            result.unparse().should.equal 'boat:10.string:4.wool'
-
-    describe 'pop', ->
-
-        it 'returns null for an empty inventory', ->
-            inventory = new Inventory
-            result = inventory.pop()
-            expect(result).to.be.null
-
-        it 'completely removes the last item', ->
-            stack = inventory.pop()
-            stack.itemSlug.qualified.should.equal 'wool'
-            stack.quantity.should.equal 4
-            inventory.unparse().should.equal 'boat:20.string'
-
-        it 'triggers the right events', ->
-            events = new EventRecorder inventory
-            result = inventory.pop()
-            events.names.should.eql [c.event.remove, c.event.change]
-
-    describe 'remove', ->
-
-        it 'does nothing when the item is absent', ->
-            before = inventory.unparse()
-            inventory.remove 'foo'
-            after = inventory.unparse()
-
-            before.should.equal after
-
-        it 'throws when the item has insufficient quantity', ->
-            expect(-> inventory.remove('wool', 10)).to.throw Error,
-                'cannot remove 10: only 4 wool in this inventory'
-
-        it 'removes all items by default', ->
-            inventory.remove 'wool'
-            expect(inventory._stacks.wool).to.be.empty
-
-        it 'removes a quantity above 1', ->
-            inventory.remove 'wool', 3
-            inventory._stacks.wool.quantity.should.equal 1
-
-        it 'emits the proper events', ->
-            events = new EventRecorder inventory
-            inventory.remove 'wool'
-            events.names.should.eql [c.event.change, c.event.remove, c.event.change]

src/client/models/game/item.coffee

@@ -5,86 +5,92 @@
 # All rights reserved.
 #
 
-BaseModel       = require '../base_model'
-ItemSlug        = require './item_slug'
-Recipe          = require './recipe'
-{StringBuilder} = require 'crafting-guide-common'
-
 ########################################################################################################################
 
-module.exports = class Item extends BaseModel
+module.exports = class Item
 
-    @Group = Other:'Other'
+    constructor: (attributes={})->
+        @id           = attributes.id
+        @displayName  = attributes.displayName
+        @isGatherable = attributes.isGatherable
+        @mod          = attributes.mod
 
-    constructor: (attributes={}, options={})->
-        if not attributes.name? then throw new Error 'attributes.name is required'
-
-        attributes.description          ?= null
-        attributes.group                ?= Item.Group.Other
-        attributes.ignoreDuringCrafting ?= false
-        attributes.isGatherable         ?= false
-        attributes.modVersion           ?= null
-        attributes.officialUrl          ?= null
-        attributes.slug                 ?= ItemSlug.slugify attributes.name
-        attributes.videos               ?= []
-
-        options.logEvents ?= false
-        super attributes, options
-
-        @on c.event.change + ':modVersion', =>
-            @_isCraftable = null
-            @slug.mod = @modVersion?.modSlug
-
-    # Public Methods ###############################################################################
-
-    compareTo: (that)->
-        if this.slug isnt that.slug
-            return if this.slug < that.slug then -1 else +1
-        if this.name isnt that.name
-            return if this.name < that.name then -1 else +1
-        return 0
-
-    unparse: ->
-        ItemParser = require '../parsing/item_parser' # to avoid require cycles
-        @_parser ?= new ItemParser model:this
-        return @_parser.unparse()
+        @_hasPrimaryRecipe = false
+        @_recipesAsPrimary = {}
+        @_recipesAsExtra = {}
 
     # Property Methods #############################################################################
 
-    getIsCraftable: ->
-        if not @_isCraftable?
-            @_isCraftable = false
-            if @modVersion?
-                @_isCraftable = @modVersion.hasRecipes @slug
-
-        return @_isCraftable
-
     Object.defineProperties @prototype,
-        isCraftable: {get:@prototype.getIsCraftable}
 
-    # Backbone.Model Overrides #####################################################################
+        displayName: # a string containing the user-facing name of this item
+            get: -> return @_displayName
+            set: (displayName)->
+                if not displayName? then throw new Error "displayName is required"
+                @_displayName = displayName
 
-    parse: (text)->
-        ItemParser = require '../parsing/item_parser' # to avoid require cycles
-        @_parser ?= new ItemParser model:this
-        @_parser.parse text
+        firstRecipe: # the first Recipe returned by iterating the `recipes` property
+            get: ->
+                recipeList = (recipe for id, recipe of @recipes)
+                return null unless recipeList.length > 0
+                return recipeList[0]
+            set: -> throw new Error "firstRecipe cannot be assigned"
 
-        return null # prevent calling `set`
+        id: # a string containing a unique identifier for this item
+            get: -> return @_id
+            set: (id)->
+                if not id? then throw new Error "id is required"
+                return if @_id is id
+                if @_id? then throw new Error "id cannot be reassigned"
+                @_id = id
 
-    url: ->
-        return c.url.itemData modSlug:@slug.mod, itemSlug:@slug.item
+        isGatherable: # whether this item can be gathered directly without needing to be crafted
+            get: ->
+                return true if @_isGatherable is true
+                return false if (id for id, recipe of @_recipesAsPrimary).length > 0
+                return false if (id for id, recipe of @_recipesAsExtra).length > 0
+                return true
+            set: (isGatherable)->
+                @_isGatherable = null unless isGatherable?
+                @_isGatherable = !!isGatherable
+
+        mod: # the Mod which adds this item to the game
+            get: -> return @_mod
+            set: (mod)->
+                if not mod? then throw new Error "mod is required"
+                if @_mod is mod then return
+                if @_mod? then throw new Error "mod cannot be reassigned"
+                @_mod = mod
+                @_mod.addItem this
+
+        modPack: # the ModPack containing this item
+            get: -> return @_mod.modPack
+            set: -> throw new Error "modPack cannot be assigned"
+
+        recipes: # a hash of recipeId to Recipe containing `recipesAsPrimary` if not empty or else `recipesAsExtra`
+            get: -> return if @_hasPrimaryRecipe then @_recipesAsPrimary else @_recipesAsExtra
+            set: -> throw new Error "recipes cannot be assigned"
+
+        recipesAsPrimary: # a hash of recipeId to Recipe where this item is the primary output
+            get: -> return @_recipesAsPrimary
+            set: -> throw new Error "recipes cannot be assigned"
+
+        recipesAsExtra: # a hash of recipeId to Recipe where this item is an extra output
+            get: -> return @_recipesAsExtra
+            set: -> throw new Error "recipesAsExtra cannot be assigned"
+
+    # Public Recipes ###############################################################################
+
+    addRecipe: (recipe)->
+        if recipe.output.item is this
+            @_recipesAsPrimary[recipe.id] = recipe
+            @_hasPrimaryRecipe = true
+        else if recipe.extras[this.id]?.item is this
+            @_recipesAsExtra[recipe.id] = recipe
+        else
+            throw new Error "recipe<#{recipe.id}> does not produce this item<#{@id}>"
 
     # Object Overrides #############################################################################
 
     toString: ->
-        builder = new StringBuilder
-        return builder
-            .push @constructor.name, ' (', @cid, ') { '
-            .push 'name:"', @name, '", '
-            .push 'isCraftable:', @isCraftable, ', '
-            .push 'isGatherable:', @isGatherable, ', '
-            .onlyIf (@group isnt Item.Group.Other), (b)=>
-                b.push 'group:"', @group, '", '
-            .push 'slug:"', @slug, '", '
-            .push '}'
-            .toString()
+        return "Item:#{@displayName}<#{@id}>"

src/client/models/game/item_slug.test.coffee

@@ -1,122 +0,0 @@
-#
-# Crafting Guide - item_slug.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-ItemSlug = require './item_slug'
-
-########################################################################################################################
-
-describe 'item_slug.coffee', ->
-
-    describe 'constructor', ->
-
-        it 'can handle one argument', ->
-            slug = new ItemSlug 'alpha'
-            slug.item.should.equal 'alpha'
-            expect(slug.mod).to.be.null
-            slug.qualified.should.equal 'alpha'
-
-        it 'can handle two arguments', ->
-            slug = new ItemSlug 'alpha', 'bravo'
-            slug.mod.should.equal 'alpha'
-            slug.item.should.equal 'bravo'
-            slug.qualified.should.equal 'alpha__bravo'
-
-        it 'throws with zero arguments', ->
-            f = -> new ItemSlug
-            expect(f).to.throw Error, 'expected arguments to be "modSlug, itemSlug" or just "itemSlug"'
-
-        it 'throws with more arguments', ->
-            f = -> new ItemSlug 'alpha', 'bravo', 'charlie'
-            expect(f).to.throw Error, 'expected arguments to be "modSlug, itemSlug" or just "itemSlug"'
-
-    describe 'ItemSlug.compare', ->
-
-        it 'sorts by item when both are qualified in the same mod', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'charlie', 'bravo'
-
-            ItemSlug.compare(a, b).should.equal -1
-            ItemSlug.compare(b, a).should.equal +1
-
-        it 'sorts by item when not qualified', ->
-            a = new ItemSlug 'alpha'
-            b = new ItemSlug 'bravo'
-
-            ItemSlug.compare(a, b).should.equal -1
-            ItemSlug.compare(b, a).should.equal +1
-
-    describe 'ItemSlug.equal', ->
-
-        it 'requires both to have the same mod', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'alpha', 'charlie'
-            c = new ItemSlug 'alpha', 'bravo'
-
-            ItemSlug.equal(a, b).should.be.false
-            ItemSlug.equal(a, c).should.be.true
-
-        it 'requires both to have the same item', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'alpha', 'charlie'
-            c = new ItemSlug 'alpha', 'bravo'
-
-            ItemSlug.equal(a, b).should.be.false
-            ItemSlug.equal(a, c).should.be.true
-
-    describe 'ItemSlug.slugify', ->
-
-        it 'can slugify a pure name', ->
-            slug = ItemSlug.slugify 'Alpha Bravo (Charlie)'
-            slug.item.should.equal 'alpha_bravo_charlie'
-            expect(slug.mod).to.be.null
-
-        it 'can slugify a simple item slug', ->
-            slug = ItemSlug.slugify 'alpha_bravo_charlie'
-            slug.item.should.equal 'alpha_bravo_charlie'
-            expect(slug.mod).to.be.null
-
-        it 'can slugify a fully-qualified slug', ->
-            slug = ItemSlug.slugify 'alpha_bravo__charlie_delta'
-            slug.mod.should.equal 'alpha_bravo'
-            slug.item.should.equal 'charlie_delta'
-
-    describe 'matches', ->
-
-        it 'ignores mod when either is unqualified', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'bravo'
-            c = new ItemSlug 'charlie'
-
-            a.matches(b).should.be.true
-            a.matches(c).should.be.false
-
-        it 'observes differences in mod when all are qualified', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'charlie', 'bravo'
-            c = new ItemSlug 'delta', 'echo'
-            d = new ItemSlug 'alpha', 'bravo'
-
-            a.matches(b).should.be.false
-            a.matches(c).should.be.false
-            a.matches(d).should.be.true
-
-    describe 'isQualified', ->
-
-        it 'returns true only when the mod slug is set', ->
-            a = new ItemSlug 'alpha', 'bravo'
-            b = new ItemSlug 'charlie'
-            a.isQualified.should.be.true
-            b.isQualified.should.be.false
-
-    describe '[]', ->
-
-        it 'allows slugs as a key', ->
-            slug = new ItemSlug 'alpha', 'bravo'
-            data = {}
-            data[slug] = 'foo'
-            data['alpha__bravo'].should.equal 'foo'
-            data[slug].should.equal 'foo'

src/client/models/game/mod.coffee

@@ -5,230 +5,58 @@
 # All rights reserved.
 #
 
-BaseModel = require '../base_model'
-
 ########################################################################################################################
 
-module.exports = class Mod extends BaseModel
+module.exports = class Mod
 
-    constructor: (attributes={}, options={})->
-        if not attributes.slug? then throw new Error 'attributes.slug is required'
+    constructor: (attributes={})->
+        @id = attributes.id
+        @displayName = attributes.displayName
+        @modPack = attributes.modPack
 
-        attributes.author           ?= ''
-        attributes.description      ?= ''
-        attributes.documentationUrl ?= null
-        attributes.downloadUrl      ?= null
-        attributes.homePageUrl      ?= null
-        attributes.modPack          ?= null
-        attributes.name             ?= ''
+        @_items = {}
 
-        super attributes, options
-
-        @_activeModVersion = null
-        @_activeVersion    = null
-        @_modVersions      = []
-        @_tutorials        = []
-
-    # Class Methods ##################################################################################
-
-    @Version: Version =
-        None: 'none'
-        Latest: 'latest'
-
-    # Public Methods #################################################################################
-
-    compareTo: (that)->
-        thisRequired = this.slug in c.requiredMods
-        thatRequired = that.slug in c.requiredMods
-
-        if thisRequired isnt thatRequired
-            return -1 if thisRequired
-            return +1 if thatRequired
-        else if this.slug isnt that.slug
-            return if this.slug < that.slug then -1 else +1
-
-        return 0
-
-    # Property Methods #############################################################################
+    # Properties ###################################################################################
 
     Object.defineProperties @prototype,
 
-        activeModVersion:
-            get: -> @_activeModVersion
+        displayName:
+            get: -> return @_displayName
+            set: (displayName)->
+                if not displayName? then throw new Error "displayName is required"
+                return if @_displayName is displayName
+                @_displayName = displayName
 
-        activeVersion:
-            get: ->
-                return @_activeVersion
+        id:
+            get: -> return @_id
+            set: (id)->
+                if not id? then throw new Error "id is required"
+                return if @_id is id
+                if @_id? then throw new Error "id cannot be reassigned"
+                @_id = id
 
-            set: (version)->
-                return if version is @_activeVersion
+        items:
+            get: -> return @_items
+            set: -> throw new Error "items cannot be replaced"
 
-                version ?= Mod.Version.None
-                if version is Mod.Version.Latest then version = _.last(@_modVersions).version
+        modPack:
+            get: -> return @_modPack
+            set: (modPack)->
+                if not modPack? then throw new Error "modPack is required"
+                if @_modPack is modPack then return
+                if @_modPack? then throw new Error "modPack cannot be reassigned"
+                @_modPack = modPack
+                @_modPack.addMod this
 
-                if version is Mod.Version.None
-                    @_activeVersion = version
-                    @_activateModVersion null
+    # Public Methods ###############################################################################
 
-                    @trigger c.event.change + ':activeVersion', this, @_activeVersion
-                    @trigger c.event.change, this
-                else
-                    for modVersion in @_modVersions
-                        if version is modVersion.version
-                            @_activateModVersion modVersion
-                            break
+    addItem: (item)->
+        if not item? then return
+        if @_items[item.id] is item then return
+        @_items[item.id] = item
+        item.mod = this
 
-                    @_activeVersion = version
-                    @trigger c.event.change + ':activeVersion', this, @_activeVersion
-                    @trigger c.event.change, this
+    # Object Overrides #############################################################################
 
-        enabled:
-            get: -> @_activeModVersion?
-
-        modVersions:
-            get: -> @_modVersions[..]
-
-        tutorials:
-            get: -> @getAllTutorials()
-
-    # Item Methods #################################################################################
-
-    chooseRandomItem: ->
-        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
-        return null unless effectiveModVersion?
-
-        return effectiveModVersion.chooseRandomItem()
-
-    eachItem: (callback)->
-        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
-        effectiveModVersion.eachItem callback
-
-    findItem: (slug, options={})->
-        options.includeDisabled ?= false
-        options.enableAsNeeded  ?= false
-
-        if not options.includeDisabled
-            return unless @_activeModVersion?
-            return @_activeModVersion.findItem slug
-        else
-            for modVersion in @_modVersions
-                modVersion.fetch()
-
-                item = modVersion.findItem slug
-                if item?
-                    if options.enableAsNeeded then @setActiveVersion modVersion.version
-                    return item
-
-        return null
-
-    findItemByName: (name)->
-        return unless @_activeModVersion?
-        @_activeModVersion.findItemByName name
-
-    # ModVersion Methods ###########################################################################
-
-    addModVersion: (modVersion)->
-        return unless modVersion?
-        return if @_modVersions.indexOf(modVersion) isnt -1
-
-        @_modVersions.push modVersion
-        @listenTo modVersion, c.event.change, => @trigger c.event.change, this
-        modVersion.fileCache = this.fileCache
-        modVersion.mod = this
-
-        @trigger c.event.add + ':modVersion', modVersion, this
-        @trigger c.event.change + ':version', modVersion, this
-        @trigger c.event.change, this
-
-        if not @activeVersion? then @activeVersion = modVersion.version
-        if modVersion.version is @_activeVersion then @_activateModVersion modVersion
-        return this
-
-    eachModVersion: (callback)->
-        for modVersion in @_modVersions
-            callback modVersion
-
-    getAllModVersions: ->
-        return @_modVersions[..]
-
-    getModVersion: (version)->
-        return null if version is Mod.Version.None
-        return @_modVersions[0] if version is Mod.Version.Latest
-
-        for modVersion in @_modVersions
-            return modVersion if modVersion.version is version
-
-        return null
-
-    # Name Methods #################################################################################
-
-    eachName: (callback)->
-        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
-        effectiveModVersion.eachName callback
-
-    findName: (itemSlug)->
-        return unless @_activeModVersion?
-        @_activeModVersion.findName itemSlug
-
-    # Recipe Methods ###############################################################################
-
-    eachRecipe: (callback)->
-        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
-        effectiveModVersion.eachRecipe callback
-
-    findRecipes: (itemSlug, result=[], options={})->
-        options.alwaysFromOwningMod ?= false
-
-        if @_activeModVersion?
-            return @_activeModVersion.findRecipes itemSlug, result, options
-        else if options.alwaysFromOwningMod and itemSlug.mod is @slug
-            return @getModVersion(Mod.Version.Latest).findRecipes itemSlug, result, options
-
-        return null
-
-    # Tutorial Methods #############################################################################
-
-    addTutorial: (tutorial)->
-        return unless tutorial?
-        if @getTutorial(tutorial.slug)? then throw new Error "duplicate tutorial: #{tutorial.name}"
-        @_tutorials.push tutorial
-        tutorial.modSlug = @slug
-
-    getAllTutorials: ->
-        return @_tutorials[..]
-
-    getTutorial: (tutorialSlug)->
-        for tutorial in @_tutorials
-            return tutorial if tutorial.slug is tutorialSlug
-        return null
-
-    # Backbone.Model Overrides #####################################################################
-
-    parse: (text)->
-        ModParser = require '../parsing/mod_parser' # to avoid require cycles
-        @_parser ?= new ModParser model:this
-        @_parser.parse text
-
-        @_verifyActiveModVersion()
-
-        return null # prevent calling `set`
-
-    url: ->
-        return c.url.modData modSlug:@slug
-
-    # Private Methods ##############################################################################
-
-    _activateModVersion: (modVersion)->
-        if @_activeModVersion? then @stopListening @_activeModVersion
-        @_activeModVersion = modVersion
-        @trigger c.event.change + ':activeModVersion', this, @_activeModVersion
-
-        logger.verbose => "#{@slug} switched to version #{@_activeVersion}"
-
-        if @_activeModVersion?
-            @listenTo @_activeModVersion, 'all', -> @trigger.apply this, arguments
-
-    _verifyActiveModVersion: ->
-        if (@_activeVersion isnt Version.None) and (not @_activeModVersion?)
-            logger.warning => "#{@slug} no longer has a version #{@_activeVersion}, using latest instead"
-            @activeVersion = Version.Latest
+    toString: ->
+        return "Mod:#{@displayName}<#{@id}>"

src/client/models/game/mod.test.coffee

@@ -1,30 +0,0 @@
-#
-# Crafting Guide - mod.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-Mod = require './mod'
-
-########################################################################################################################
-
-mod = null
-
-########################################################################################################################
-
-describe 'mod.coffee', ->
-
-    beforeEach -> mod = new Mod name:'Test', slug:'test'
-
-    describe 'compareTo', ->
-
-        it 'lists required mods first', ->
-            minecraft = new Mod name:'Minecraft', slug:'minecraft'
-            mod.compareTo(minecraft).should.equal +1
-            minecraft.compareTo(mod).should.equal -1
-
-        it 'sorts by name second', ->
-            buildcraft = new Mod name:'Buildcraft', slug:'buildcraft'
-            mod.compareTo(buildcraft).should.equal +1
-            buildcraft.compareTo(mod).should.equal -1

src/client/models/game/mod_pack.coffee

@@ -5,198 +5,55 @@
 # All rights reserved.
 #
 
-BaseModel        = require '../base_model'
-Mod              = require './mod'
-ModVersionParser = require '../parsing/mod_version_parser'
-Recipe           = require './recipe'
-SimpleInventory  = require '../crafting/simple_inventory'
-
 ########################################################################################################################
 
-module.exports = class ModPack extends BaseModel
+module.exports = class ModPack
 
-    constructor: (attributes={}, options={})->
-        super attributes, options
+    constructor: (attributes={})->
+        @id = attributes.id
+        @displayName = attributes.displayName
 
-        @_mods = []
-        @_cache = {}
+        @_mods = {}
 
-        @on c.event.change, => @_cache = {}
+    # Property Methods #############################################################################
 
-    # Item Methods #################################################################################
+    Object.defineProperties @prototype,
 
-    chooseRandomItem: ->
-        return null unless @_mods.length > 0
+        displayName: # a string containing the user-displayable name of this ModPack
+            get: -> return @_displayName
+            set: (displayName)->
+                if not displayName? then throw new Error "displayName is required"
+                if @_displayName is displayName then return
+                @_displayName = displayName
 
-        modIndex = Math.floor Math.random() * @_mods.length
-        return @_mods[modIndex].chooseRandomItem()
+        id: # a string which uniquely identifies this ModPack
+            get: -> return @_id
+            set: (id)->
+                if not id? then throw new Error "id is required"
+                if @_id is id then return
+                if @_id? then throw new Error "id cannot be reassigned"
+                @_id = id
 
-    findItem: (itemSlug, options={})->
-        options.includeDisabled ?= false
+        mods: # a hash of mod id to Mod containing all the mods which are part of this ModPack
+            get: -> return @_mods
+            set: -> throw new Error "mods cannot be replaced"
 
-        key = "#{itemSlug}-#{options.includeDisabled}"
-        @_cache.itemBySlug ?= {}
-        item = @_cache.itemBySlug[key]
-        return item if item?
+    # Public Methods ###############################################################################
 
-        if itemSlug.isQualified
-            mod = @getMod itemSlug.mod
-            if mod?
-                item = mod.findItem itemSlug, options
+    addMod: (mod)->
+        if not mod? then return
+        if @_mods[mod.id] is mod then return
+        @_mods[mod.id] = mod
+        mod.modPack = this
 
-        if not item?
-            for mod in @_mods
-                continue unless mod.enabled or options.includeDisabled
-                item = mod.findItem itemSlug, options
-                break if item?
-
-        if item?
-            @_cache.itemBySlug[key] = item
-
-        return item
-
-    findItemByName: (name, options={})->
-        options.enableAsNeeded ?= false
-        options.includeDisabled = true if options.enableAsNeeded
-
-        for mod in @_mods
-            continue unless mod.enabled or options.includeDisabled
-            item = mod.findItemByName name, options
+    findItem: (itemId)->
+        for modId, mod of @mods
+            item = mod.items[itemId]
             return item if item?
 
         return null
 
-    findItemDisplay: (itemSlug)->
-        if not itemSlug? then throw new Error 'itemSlug is required'
-
-        result = {slug:itemSlug}
-        item = @findItem itemSlug, includeDisabled:true
-        if item?
-            result.itemName   = item.name
-            result.itemSlug   = item.slug.item
-            result.modSlug    = item.slug.mod
-            result.modVersion = item.modVersion.version
-        else
-            result.itemName   = @findName itemSlug, includeDisabled:true
-            result.itemSlug   = itemSlug.item
-            result.modSlug    = @_mods[0].slug
-            result.modVersion = @_mods[0].activeVersion
-
-        craftingUrlInventory = new SimpleInventory modPack:this
-        if item?.multiblock?
-            craftingUrlInventory.addInventory item.multiblock.inventory
-        else
-            craftingUrlInventory.add itemSlug
-
-        result.craftingUrl = c.url.crafting inventoryText:craftingUrlInventory.unparse()
-        result.iconUrl     = c.url.itemIcon result
-        result.itemUrl     = c.url.item result
-        result.modName     = @getMod(result.modSlug).name
-        return result
-
-    qualifySlug: (itemSlug)->
-        return itemSlug if itemSlug.isQualified
-
-        item = @findItem itemSlug
-        return item.slug if item?
-        return itemSlug
-
-    # Mod Methods ##################################################################################
-
-    addMod: (mod)->
-        if not mod? then throw new Error 'mod is required'
-        return if @_mods.indexOf(mod) isnt -1
-
-        mod.modPack = this
-        @_mods.push mod
-        @listenTo mod, c.event.change, (modVersion)=> @_onModVersionLoaded modVersion
-        @trigger c.event.add + ':mod', mod, this
-
-        @_mods.sort (a, b)-> a.compareTo b
-        @trigger c.event.sort + ':mod', this
-        @trigger c.event.change, this
-
-        return this
-
-    eachMod: (callback)->
-        for mod in @_mods
-            callback mod
-
-    getMod: (slug)->
-        for mod in @_mods
-            return mod if mod.slug is slug
-        return null
-
-    getAllMods: ->
-        return @_mods[..]
-
-    removeMod: (mod)->
-        index = @_mods.indexOf mod
-        return unless index >= 0
-
-        @_mods.splice index, 1
-
-        @trigger c.event.remove, this, mod.slug
-        @trigger c.event.change, this
-
-    # Name Methods #################################################################################
-
-    findName: (slug, options={})->
-        options.includeDisabled ?= false
-
-        for mod in @_mods
-            continue unless mod.enabled or options.includeDisabled
-            name = mod.findName slug
-            return name if name
-
-        return null
-
-    # Recipe Methods ###############################################################################
-
-    findRecipes: (itemSlug, options={})->
-        options.alwaysFromOwningMod ?= false
-        return null unless itemSlug?
-
-        key = "#{itemSlug}-#{options.alwaysFromOwningMod}"
-        @_cache.recipesBySlug ?= {}
-        result = @_cache.recipesBySlug[key]
-        return result if result?
-
-        result = []
-        for mod in @_mods
-            if not mod.enabled
-                owningMod = itemSlug.isQualified and (itemSlug.mod is mod.slug)
-                continue unless owningMod and options.alwaysFromOwningMod
-
-            mod.findRecipes itemSlug, result, options
-
-        @_cache.recipesBySlug[key] = result
-        return if result.length > 0 then result else null
-
     # Object Overrides #############################################################################
 
     toString: ->
-        return "ModPack (#{@cid}) {modVersions:«#{@_mods.length} items»}"
-
-    # Private Methods ##############################################################################
-
-    _onModVersionLoaded: (modVersion)->
-        mods = @getAllMods()
-        return true unless mods.length > 0
-
-        for mod in mods
-            if mod.isError
-                @removeMod mod
-                continue
-
-            modVersions = mod.getAllModVersions()
-            return true unless modVersions.length > 0
-            continue if mod.activeVersion is Mod.Version.None
-
-            activeModVersion = mod.activeModVersion
-            return true unless activeModVersion?
-            return true if activeModVersion.isUnloaded
-            return true if activeModVersion.isLoading
-
-        @trigger c.event.change, this
-        @trigger c.event.sync, this
+        return "ModPack:#{@displayName}<#{@id}>"

src/client/models/game/mod_pack.test.coffee

@@ -1,103 +0,0 @@
-#
-# Crafting Guide - mod_pack.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-Item       = require './item'
-ItemSlug   = require './item_slug'
-Mod        = require './mod'
-ModPack    = require './mod_pack'
-ModVersion = require './mod_version'
-
-########################################################################################################################
-
-buildcraft = industrialCraft = minecraft = modPack = null
-
-########################################################################################################################
-
-describe 'mod_pack.coffee', ->
-
-    beforeEach ->
-        minecraft = new Mod slug:'minecraft', name:'Minecraft'
-        minecraft.addModVersion new ModVersion modSlug:minecraft.slug, version:'1.7.10'
-        minecraft.activeModVersion.addItem new Item name:'Wool'
-        minecraft.activeModVersion.addItem new Item name:'Bed', recipes:['']
-        minecraft.activeModVersion.registerName ItemSlug.slugify('iron_chestplate'), 'Iron Chestplate'
-
-        buildcraft = new Mod slug:'buildcraft', name:'Buildcraft'
-        buildcraft.addModVersion new ModVersion modSlug:buildcraft.slug, version:'6.2.6'
-        buildcraft.activeModVersion.addItem new Item name:'Stone Gear', recipes:['']
-        buildcraft.activeModVersion.addItem new Item name:'Wrench', recipes:['']
-        buildcraft.activeVersion = Mod.Version.None
-
-        industrialCraft = new Mod slug:'industrial_craft', name:'Industrial Craft'
-        industrialCraft.addModVersion new ModVersion modSlug:industrialCraft.slug, version:'2.0'
-        industrialCraft.activeModVersion.addItem new Item name:'Resin'
-        industrialCraft.activeModVersion.addItem new Item name:'Rubber'
-        industrialCraft.activeModVersion.addItem new Item name:'Wrench', recipes:['']
-        industrialCraft.activeVersion = Mod.Version.None
-
-        modPack = new ModPack
-        modPack.addMod minecraft
-        modPack.addMod buildcraft
-        modPack.addMod industrialCraft
-
-    describe 'findItem', ->
-
-        it 'can find an item by partial slug', ->
-            item = modPack.findItem ItemSlug.slugify 'wool'
-            item.slug.qualified.should.equal 'minecraft__wool'
-
-        it 'can find an item by full slug', ->
-            item = modPack.findItem ItemSlug.slugify 'minecraft__wool'
-            item.name.should.equal 'Wool'
-
-        it 'can find an ambiguous item by full slug', ->
-            buildcraft.activeVersion = Mod.Version.Latest
-            industrialCraft.activeVersion = Mod.Version.Latest
-            item = modPack.findItem ItemSlug.slugify 'industrial_craft__wrench'
-            item.name.should.equal 'Wrench'
-            item.modVersion.mod.name.should.equal 'Industrial Craft'
-
-        it 'can find an ambiguous item by partial slug', ->
-            buildcraft.activeVersion = Mod.Version.Latest
-            industrialCraft.activeVersion = Mod.Version.Latest
-            item = modPack.findItem ItemSlug.slugify 'wrench'
-            item.name.should.equal 'Wrench'
-            item.modVersion.mod.name.should.equal 'Buildcraft'
-
-    describe 'findItemByName', ->
-
-        it 'finds the requested item', ->
-            item = modPack.findItemByName 'Bed'
-            item.name.should.equal 'Bed'
-
-        it 'ignores disabled mod versions', ->
-            item = modPack.findItemByName 'Stone Gear'
-            expect(item).to.be.null
-
-    describe 'findItemDisplay', ->
-
-        it 'returns all data for a regular Minecraft item', ->
-            display = modPack.findItemDisplay ItemSlug.slugify 'bed'
-            display.iconUrl.should.equal '/data/minecraft/items/bed/icon.png'
-            display.itemUrl.should.equal '/browse/minecraft/bed/'
-            display.itemName.should.equal 'Bed'
-            display.modSlug.should.equal 'minecraft'
-
-        it 'returns all data for an item in an enabled mod', ->
-            buildcraft.activeVersion = '6.2.6'
-            display = modPack.findItemDisplay ItemSlug.slugify 'stone_gear'
-            display.iconUrl.should.equal '/data/buildcraft/items/stone_gear/icon.png'
-            display.itemUrl.should.equal '/browse/buildcraft/stone_gear/'
-            display.itemName.should.equal 'Stone Gear'
-            display.modSlug.should.equal 'buildcraft'
-
-        it 'assumes an unfound item is from Minecraft', ->
-            display = modPack.findItemDisplay ItemSlug.slugify 'iron_chestplate'
-            display.iconUrl.should.equal '/data/minecraft/items/iron_chestplate/icon.png'
-            display.itemUrl.should.equal '/browse/minecraft/iron_chestplate/'
-            display.itemName.should.equal 'Iron Chestplate'
-            display.modSlug.should.equal 'minecraft'

src/client/models/game/mod_version.test.coffee

@@ -1,106 +0,0 @@
-#
-# Crafting Guide - mod_version.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-Item       = require './item'
-ItemSlug   = require './item_slug'
-ModVersion = require './mod_version'
-
-########################################################################################################################
-
-modVersion = null
-
-########################################################################################################################
-
-describe 'mod_version.coffee', ->
-
-    beforeEach ->
-        modVersion = new ModVersion modSlug:'test', version:'0.0'
-        modVersion.addItem new Item name:'underscore', group:'punctuation'
-        modVersion.addItem new Item name:'bravo',      group:'letter'
-        modVersion.addItem new Item name:'alpha',      group:'letter'
-        modVersion.addItem new Item name:'one',        group:'number'
-        modVersion.addItem new Item name:'two',        group:'number'
-
-    describe 'constructor', ->
-
-        it 'requires a mod slug', ->
-            expect(-> new ModVersion version:'0.0').to.throw Error, 'attributes.modSlug is required'
-
-        it 'requires a mod version', ->
-            expect(-> new ModVersion modSlug:'test').to.throw Error, 'attributes.version is required'
-
-    describe 'addItem', ->
-
-        it 'refuses to add duplicates', ->
-            modVersion.addItem new Item name:'Wool'
-            expect(-> modVersion.addItem new Item name:'Wool').to.throw Error, 'duplicate item for Wool'
-
-        it 'adds an item indexed by its slug', ->
-            modVersion.addItem new Item name:'Wool'
-            modVersion._items.wool.name.should.equal 'Wool'
-
-        it 'sets the modVersion', ->
-            modVersion.addItem new Item name:'Wool'
-            modVersion._items.wool.modVersion.should.equal modVersion
-
-    describe 'eachGroup', ->
-
-        it 'returns all the groups in order', ->
-            groupNames = []
-            modVersion.eachGroup (groupName)-> groupNames.push groupName
-            groupNames.should.eql ['letter', 'number', 'punctuation']
-
-    describe 'eachItemInGroup', ->
-
-        it 'returns immediately for unknown group', ->
-            slugs = []
-            modVersion.eachItemInGroup 'foobar', (item)-> slugs.push item.slug.qualified
-            slugs.should.eql []
-
-        it 'calls callback for exactly the items in a group in order', ->
-            slugs = []
-            modVersion.eachItemInGroup 'letter', (item)-> slugs.push item.slug.qualified
-            slugs.should.eql ['test__alpha', 'test__bravo']
-
-            slugs = []
-            modVersion.eachItemInGroup 'number', (item)-> slugs.push item.slug.qualified
-            slugs.should.eql ['test__one', 'test__two']
-
-
-    describe 'findItemByName', ->
-
-        it 'locates items by slugified name', ->
-            modVersion.addItem new Item name:'Crafting Table'
-            modVersion.findItemByName('Crafting Table').slug.qualified.should.equal 'test__crafting_table'
-
-    describe 'findRecipes', ->
-
-        beforeEach ->
-            modVersion = new ModVersion modSlug:'test', version:'1.0'
-            modVersion.parse """
-                schema:1
-
-                item: Cake
-                    recipe:; input: Milk, Sugar, Egg, Wheat; pattern: 000 121 333; extras: 3 Bucket
-                    recipe:; input: Milk, Cocoa Beans, Egg, Wheat; pattern: 000 121 333; extras: 3 Bucket
-                    recipe:; input: Cake Slice; pattern: 000 000 000; onlyIf: item Cake Slice
-                item: Bucket
-                    recipe:; input: Iron Ingot; pattern: ... 0.0 .0.
-                    recipe:; input: Copper Ingot; pattern: ... 0.0 .0.; extras: Copper Nugget
-            """
-
-        it 'finds all recipes which list item as output', ->
-            recipes = modVersion.findRecipes ItemSlug.slugify('test__bucket')
-            (r.output[0].itemSlug.item for r in recipes).sort().should.eql ['bucket', 'bucket']
-
-        it 'skip recipes whose conditions are not met', ->
-            recipes = modVersion.findRecipes ItemSlug.slugify('test__cake')
-            recipes.length.should.equal 2
-
-        it 'finds recipes for items which are only ever extras', ->
-            recipes = modVersion.findRecipes ItemSlug.slugify('test__copper_nugget')
-            recipes.length.should.equal 1

src/client/models/game/multiblock.test.coffee

@@ -1,85 +0,0 @@
-#
-# Crafting Guide - multiblock.test.coffee
-#
-# Copyright © 2014-2016 by Redwood Labs
-# All rights reserved.
-#
-
-ItemSlug   = require './item_slug'
-Mod        = require './mod'
-Multiblock = require './multiblock'
-Stack      = require './stack'
-
-########################################################################################################################
-
-describe 'multiblock.coffee', ->
-
-    describe 'with a single block type', ->
-
-        beforeEach ->
-            @input = [ new Stack itemSlug:ItemSlug.slugify('cobblestone'), quantity:1 ]
-
-        it 'correctly parses a 1x1x1 cube', ->
-            model = new Multiblock input:@input, layers:['0']
-            model.depth.should.equal 1
-            model.height.should.equal 1
-            model.width.should.equal 1
-            model.getStackAt(0, 0, 0).toString().should.equal '1 cobblestone'
-
-        it 'correctly parses a solid 3x3x3 cube', ->
-            model = new Multiblock input:@input, layers:['000 000 000', '000 000 000', '000 000 000']
-            model.depth.should.equal 3
-            model.height.should.equal 3
-            model.width.should.equal 3
-
-            for x in [0..2]
-                for y in [0..2]
-                    for z in [0..2]
-                        model.getStackAt(x, y, z).toString().should.equal '1 cobblestone'
-
-        it 'correctly parses a hollow 3x3x3 cube', ->
-            model = new Multiblock input:@input, layers:['000 000 000', '000 0.0 000', '000 000 000']
-            model.depth.should.equal 3
-            model.height.should.equal 3
-            model.width.should.equal 3
-
-            for x in [0..2]
-                for y in [0..2]
-                    for z in [0..2]
-                        if x isnt 1 or y isnt 1 or z isnt 1
-                            model.getStackAt(x, y, z).toString().should.equal '1 cobblestone'
-                        else
-                            expect(model.getStackAt(x, y, z)).to.be.null
-
-        it 'correctly parses a 3x2x3 pyramid', ->
-            model = new Multiblock input:@input, layers:['000 000 000', '.. .0 ..']
-            model.depth.should.equal 3
-            model.height.should.equal 2
-            model.width.should.equal 3
-
-            for y in [0..1]
-                for z in [0..2]
-                    for x in [0..2]
-                        if y is 1 and (x isnt 1 or z isnt 1)
-                            expect(model.getStackAt(x, y, z)).to.be.null
-                        else
-                            model.getStackAt(x, y, z).toString().should.equal '1 cobblestone'
-
-    describe 'with multiple block types', ->
-
-        beforeEach ->
-            @input = [
-                new Stack itemSlug:ItemSlug.slugify('cobblestone'), quantity:1
-                new Stack itemSlug:ItemSlug.slugify('stone'), quantity:1
-                new Stack itemSlug:ItemSlug.slugify('oak wood'), quantity:1
-            ]
-
-        it 'correctly parses a 1x3x1 column of different types', ->
-            model = new Multiblock input:@input, layers:['0', '1', '2']
-            model.depth.should.equal 1
-            model.height.should.equal 3
-            model.width.should.equal 1
-
-            model.getStackAt(0, 0, 0).toString().should.equal '1 cobblestone'
-            model.getStackAt(0, 1, 0).toString().should.equal '1 stone'
-            model.getStackAt(0, 2, 0).toString().should.equal '1 oak_wood'

src/client/models/game/recipe.coffee

@@ -5,243 +5,170 @@
 # All rights reserved.
 #
 
-BaseModel       = require '../base_model'
-ItemSlug        = require './item_slug'
-Stack           = require './stack'
 {StringBuilder} = require 'crafting-guide-common'
 
 ########################################################################################################################
 
-module.exports = class Recipe extends BaseModel
+module.exports = class Recipe
 
-    constructor: (attributes={}, options={})->
-        if not attributes.input? then throw new Error 'attributes.input is required'
-        if not attributes.pattern? then throw new Error 'attributes.pattern is required'
+    constructor: (attributes={})->
+        @depth  = attributes.depth
+        @height = attributes.height
+        @id     = attributes.id
+        @output = attributes.output
+        @width  = attributes.width
 
-        if attributes.itemSlug? and not attributes.output?
-            attributes.output = [new Stack itemSlug:attributes.itemSlug, quantity:1]
-        else if attributes.output? and not attributes.itemSlug?
-            if attributes.output.length is 0 then throw new Error 'attributes.output cannot be empty'
-            attributes.itemSlug = attributes.output[0].itemSlug
-        else
-            throw new Error 'attributes.itemSlug or attributes.output is required'
+        @_extras    = {}
+        @_inputs    = {}
+        @_inputGrid = []
+        @_tools     = {}
 
-        attributes.pattern = @_parsePattern attributes.pattern
-
-        attributes.condition            ?= null
-        attributes.ignoreDuringCrafting ?= false
-        attributes.modVersion           ?= null
-        attributes.tools                ?= []
-        options.logEvents               ?= false
-        super attributes, options
-
-        @_computeQuantities attributes.pattern
-
-        @on c.event.change + ':modVersion', => @_slug = null
-        @on c.event.change + ':pattern', => @_patternCache = null
-
-    # Class Methods ################################################################################
-
-    @compareFor: (a, b, itemSlug)->
-        if itemSlug?
-            aValue = a.itemSlug.matches itemSlug
-            bValue = b.itemSlug.matches itemSlug
-            if aValue isnt bValue
-                return -1 if aValue
-                return +1 if bValue
-
-            aValue = a.getQuantityProduced itemSlug
-            bValue = b.getQuantityProduced itemSlug
-            if aValue isnt bValue
-                return if aValue > bValue then -1 else +1
-
-        return 0
-
-    # Public Methods ###############################################################################
-
-    getStackAtSlot: (patternSlot)->
-        trueIndex = 0:0, 1:1, 2:2, 3:4, 4:5, 5:6, 6:8, 7:9, 8:10
-        patternDigit = @pattern[trueIndex[patternSlot]]
-        return null unless patternDigit?
-        return null unless patternDigit.match /[0-9]/
-
-        stack = @input[parseInt(patternDigit)]
-        return null unless stack?
-
-        return stack
-
-    getQuantityProduced: (itemSlug)->
-        total = 0
-        for stack in @output
-            if stack.itemSlug.matches itemSlug
-                total += stack.quantity
-
-        return total
-
-    getQuantityRequired: (itemSlug)->
-        total = 0
-        for stack, index in @input
-            if ItemSlug.equal stack.itemSlug, itemSlug
-                total += @_quantities[index] * stack.quantity
-
-        return total
-
-    hasAllTools: (modPack)->
-        modPack ?= @modVersion?.mod?.modPack
-        return true unless modPack?
-
-        for stack in @tools
-            return false unless modPack.findItem stack.itemSlug
-        return true
-
-    isConditionSatisfied: (modPack)->
-        return true unless @condition?
-        modPack ?= @modVersion?.mod?.modPack
-
-        result = false
-        if @condition.verb is 'item'
-            if modPack?.findItemByName(@condition.noun)?
-                result = true
-        else if @condition.verb is 'mod'
-            modPack.eachMod (mod)=>
-                if mod.name is @condition.noun
-                    result = true
-
-        if @condition.inverted then result = not result
-        return result
-
-    isPassThroughFor: (itemSlug)->
-        return @getQuantityProduced(itemSlug) is @getQuantityRequired(itemSlug)
-
-    produces: (itemSlug)->
-        if not @_produces?
-            @_produces = {}
-
-            for stack in @output
-                actuallyProduces = not @isPassThroughFor stack.itemSlug
-                @_produces[stack.itemSlug.qualified] = actuallyProduces
-
-        result = @_produces[itemSlug.qualified] or @_produces[itemSlug.item]
-        return result
-
-    requires: (itemSlug)->
-        for stack in @input
-            if stack.itemSlug.matches itemSlug
-                return true
-        return false
-
-    requiresTool: (itemSlug)->
-        for stack in @tools
-            if stack.itemSlug.matches itemSlug
-                return true
-
-    # Property Methods #############################################################################
+    # Properties ###################################################################################
 
     Object.defineProperties @prototype,
 
-        slug:
-            get: ->
-                if not @_slug?
-                    builder = new StringBuilder
-                    delimiterNeeded = false
-                    for stack in @input
-                        if delimiterNeeded then builder.push ','
-                        delimiterNeeded = true
+        allProducts: # an array of Stacks starting the the primary output of this recipe
+            get: -> return [].concat @output, (stack for id, stack of @extras)
+            set: -> throw new Error "allProducts cannot be assigned"
 
-                        if stack.quantity > 1 then builder.push stack.quantity, ' '
-                        builder.push stack.itemSlug.qualified
+        depth: # an integer specifying the number of layers to this recipe
+            get: -> return @_depth
+            set: (depth)->
+                depth = parseInt "#{depth}"
+                depth = if Number.isNaN(depth) then 0 else Math.max(0, depth)
+                @_depth = depth
 
-                    builder.push '>'
-                    builder.push @pattern
-                    builder.push '>'
-                    for stack in @tools
-                        builder.push stack.itemSlug.qualified
-                    builder.push '>'
+        extras: # a hash of item id to Stack of all the non-primary outputs of this recipe
+            get: -> return @_extras
+            set: -> throw new Error "extras cannot be replaced"
 
-                    delimiterNeeded = false
-                    for stack in @output
-                        if delimiterNeeded then builder.push ','
-                        delimiterNeeded = true
+        id: # a string which uniquely identifies this recipe
+            get: -> return @_id
+            set: (id)->
+                if not id? then throw new Error "id is required"
+                if @_id is id then return
+                if @_id? then throw new Error "id cannot be reassigned"
+                @_id = id
 
-                        if stack.quantity > 1 then builder.push stack.quantity, ' '
-                        builder.push stack.itemSlug.qualified
+        height: # an integer specifying the number of rows needed by this recipe
+            get: -> return @_height
+            set: (height)->
+                height = parseInt "#{height}"
+                height = if Number.isNaN(height) then 0 else Math.max(0, height)
+                @_height = height
 
-                    @_slug = builder.toString()
+        inputs: # a hash of item id to Item containing all the inputs to this recipe
+            get: -> return @_inputs
+            set: -> throw new Error "inputs cannot be replaced"
 
-                return @_slug
+        needsTools: # a boolean indicating whether this recipe requires a tool
+            get: -> return (id for id, toolItem of @_tools).length > 0
+
+        output: # a Stack specifying the primary output of this recipe
+            get: -> return @_output
+            set: (output)->
+                if not output? then throw new Error "output is required"
+                if @_output is output then return
+                if @_output? then throw new Error "output cannot be reassigned"
+                @_output = output
+                @_output.item.addRecipe this
+
+        modPack: # the ModPack to which this recipe belongs
+            get: -> return @_output.modPack
+            set: -> throw new Error "modPack cannot be replaced"
+
+        tools: # a hash of item id to Item of all the tools required for this recipe
+            get: -> return @_tools
+            set: -> throw new Error "tools cannot be assigned"
+
+        width: # an integer specifying the number of columns needed by this recipe
+            get: -> return @_width
+            set: (width)->
+                width = parseInt "#{width}"
+                width = if Number.isNaN(width) then 0 else Math.max(0, width)
+                @_width = width
+
+    # Public Methods ###############################################################################
+
+    addExtra: (stack)->
+        return unless stack
+        return if @_extras[stack.item.id] is stack
+        @_extras[stack.item.id] = stack
+        stack.item.addRecipe this
+
+    addTool: (item)->
+        return unless item
+        @_tools[item.id] = item
+
+    computeQuantityRequired: (item)->
+        result = 0
+
+        for x in [0...@width]
+            for y in [0...@height]
+                for z in [0...@depth]
+                    stack = @getInputAt x, y, z
+                    continue unless stack?
+                    continue unless stack.item.id is item.id
+                    result += stack.quantity
+
+        return result
+
+    computeQuantityProduced: (item)->
+        result = 0
+
+        if @_output.item.id is item.id
+            result += @_output.quantity
+
+        for itemId, stack of @_extras
+            continue unless itemId is item.id
+            result += stack.quantity
+
+        return result
+
+    getInputAt: ->
+        [x, y, z] = [0, 0, 0]
+        if arguments.length is 3
+            [x, y, z] = arguments
+        else
+            [x, y] = arguments
+
+        return @_inputGrid[x]?[y]?[z] or null
+
+    setInputAt: ->
+        [x, y, z, stack] = [0, 0, 0, null]
+        if arguments.length is 4
+            [x, y, z, stack] = arguments
+        else
+            [x, y, stack] = arguments
+
+        @_depth = Math.max @_depth, z + 1
+        @_height = Math.max @_height, y + 1
+        @_width = Math.max @_width, x + 1
+
+        @_inputGrid[x] ?= []
+        @_inputGrid[x][y] ?= []
+        @_inputGrid[x][y][z] = stack
+
+        if stack?.item? then @_inputs[stack.item.id] = stack.item
 
     # Object Overrides #############################################################################
 
-    toString: ->
-        result = [@constructor.name, " (", @cid, ") { name:", @name]
+    toString: (options={})->
+        options.full ?= false
 
-        result.push ", input:["
-        needsDelimiter = false
-        for stack in @input
-            if needsDelimiter then result.push ', '
-            result.push @getQuantityRequired stack.itemSlug
-            result.push ' '
-            result.push stack.itemSlug
-            needsDelimiter = true
-        result.push ']'
+        if options.full
+            b = new StringBuilder
+            b.loop (item for id, item of @inputs), delimiter:" + ", onEach:(b, item)=>
+                b.push @computeQuantityRequired(item), " ", item.displayName
+            b.push " ="
+            b.onlyIf @needsTools, (b)=>
+                b.push "("
+                b.loop (toolItem for id, toolItem of @tools), onEach:(b, toolItem)-> b.push toolItem.displayName
+                b.push ")"
+            b.push "=> "
+            b.loop @allProducts, delimiter:" + ", onEach:(b, stack)=>
+                b.push stack.quantity, " ", stack.item.displayName
 
-        result.push ", output:["
-        needsDelimiter = false
-        for stack in @output
-            if needsDelimiter then result.push ', '
-            result.push @getQuantityProduced stack.itemSlug
-            result.push ' '
-            result.push stack.itemSlug
-            needsDelimiter = true
-        result.push ']'
-
-        if @tools.length > 0
-            result.push ", tools:["
-            needsDelimiter = false
-            for stack in @tools
-                if needsDelimiter then result.push ', '
-                result.push stack.toString()
-                needsDelimiter = true
-            result.push ']'
-
-        result.push '}'
-        return result.join ''
-
-    # Private Methods ##############################################################################
-
-    _computeQuantities: (pattern)->
-        quantityMap = {}
-
-        index = 0
-        while index < pattern.length
-            c = pattern[index]
-            index += 1
-
-            continue if c is '.'
-            continue if c is ' '
-
-            if quantityMap[c]?
-                quantityMap[c] += 1
-            else
-                quantityMap[c] = 1
-
-        @_quantities = []
-        for i in [0...@input.length]
-            @_quantities.push quantityMap["#{i}"]
-
-    _parsePattern: (pattern)->
-        return unless pattern?
-
-        pattern = pattern.replace /\ /g, ''
-        return if pattern.length is 0
-
-        pattern = pattern.replace /[^0-9]/g, '.'
-
-        array = pattern.split ''
-        array = array[0...9]
-        while array.length isnt 9
-            array.push '.'
-
-        pattern = array.join ''
-        pattern = pattern.replace /(...)(...)(...)/, '$1 $2 $3'
-        return pattern
+            return b.toString()
+        else
+            return "Recipe:#{@output}<#{@id}>"

src/client/models/game/recipe.test.coffee

@@ -5,86 +5,68 @@
 # All rights reserved.
 #
 
-Item     = require './item'
-ItemSlug = require './item_slug'
-Recipe   = require './recipe'
-Stack    = require './stack'
+fixtures = require "../fixtures"
+Item     = require "./item"
+Recipe   = require "./recipe"
+Stack    = require "./stack"
 
 ########################################################################################################################
 
-input = output = pattern = recipe = null
+describe "Recipe", ->
 
-########################################################################################################################
+    beforeEach ->
+        @mod       = fixtures.createMod()
+        @stick     = fixtures.configureStick @mod
+        @ironIngot = fixtures.configureIronIngot @mod
+        @obsidian  = fixtures.configureObsidian @mod
 
-describe 'recipe.coffee', ->
+        @ironSword = new Item id:"iron_sword", displayName:"Iron Sword", mod:@mod
+        @obsidianBox = new Item id:"obsidian_box", displayName:"Obsidian Box", mod:@mod
 
-    describe 'constructor', ->
+    describe "getting & setting inputs", ->
 
-        beforeEach ->
-            input = [
-                new Stack(itemSlug:new ItemSlug('iron_gear')),
-                new Stack(itemSlug:new ItemSlug('gold_ingot'), quantity:4)
-            ]
-            pattern = '.1. 101 .1.'
+        describe "for 2D recipes", ->
 
-        it 'requires input', ->
-            expect(-> new Recipe slug:'gold_gear', pattern:pattern).to.throw Error, 'attributes.input is required'
+            beforeEach ->
+                @recipe = new Recipe id:"test1", output:new Stack item:@ironSword
+                @recipe.setInputAt 1, 0, new Stack item:@ironIngot
+                @recipe.setInputAt 1, 1, new Stack item:@ironIngot
+                @recipe.setInputAt 1, 2, new Stack item:@stick
 
-        it 'requires a pattern', ->
-            expect(-> new Recipe slug:'gold_gear', input:input).to.throw Error, 'attributes.pattern is required'
+            it "returns assigned values as expected", ->
+                expect(@recipe.getInputAt(0, 0)).to.equal null
+                @recipe.getInputAt(1, 0).item.displayName.should.equal "Iron Ingot"
+                @recipe.getInputAt(1, 1).item.displayName.should.equal "Iron Ingot"
+                @recipe.getInputAt(1, 2).item.displayName.should.equal "Stick"
+                expect(@recipe.getInputAt(2, 2)).to.equal null
 
-        it 'requires either outputs or a slug', ->
-            f = -> new Recipe input:input, pattern:pattern
-            expect(f).to.throw 'attributes.itemSlug or attributes.output is required'
+            it "determines the correct dimentions", ->
+                @recipe.depth.should.equal 1
+                @recipe.height.should.equal 3
+                @recipe.width.should.equal 2
 
-        it 'creates default output', ->
-            recipe = new Recipe itemSlug:ItemSlug.slugify('gold_gear'), input:input, pattern:pattern
-            recipe.output.length.should.equal 1
-            recipe.output[0].itemSlug.qualified.should.equal 'gold_gear'
-            recipe.output[0].quantity.should.equal 1
+        describe "for 3D recipes", ->
 
-        it 'assigns a default slug', ->
-            recipe = new Recipe input:input, pattern:pattern, output:[new Stack itemSlug:ItemSlug.slugify('gold_gear')]
-            recipe.itemSlug.qualified.should.equal 'gold_gear'
+            beforeEach ->
+                @recipe = new Recipe id:"test2", output:new Stack item:@obsidianBox
+                for x in [0..2]
+                    for y in [0..2]
+                        for z in [0..2]
+                            continue if x is 1 and y is 1
+                            continue if x is 1 and z is 1
+                            continue if y is 1 and z is 1
 
-    describe 'getStackAtSlot', ->
+                            @recipe.setInputAt x, y, z, new Stack item:@obsidian
 
-        beforeEach ->
-            input = [
-                new Stack itemSlug:ItemSlug.slugify('iron_gear')
-                new Stack itemSlug:ItemSlug.slugify('gold_ingot'), quantity:4
-            ]
-            recipe = new Recipe itemSlug:'gold_gear', input:input, pattern:'.1. 101 .1.'
+            it "returns assigned values as expected", ->
+                @recipe.getInputAt(0, 0, 0).item.displayName.should.equal "Obsidian"
+                @recipe.getInputAt(2, 0, 0).item.displayName.should.equal "Obsidian"
+                @recipe.getInputAt(0, 2, 0).item.displayName.should.equal "Obsidian"
+                @recipe.getInputAt(2, 2, 2).item.displayName.should.equal "Obsidian"
+                expect(@recipe.getInputAt(1, 1, 1)).to.equal null
+                expect(@recipe.getInputAt(1, 1, 0)).to.equal null
 
-        it 'returns the proper item for an early slot', ->
-            stack = recipe.getStackAtSlot(1)
-            stack.itemSlug.qualified.should.equal 'gold_ingot'
-            stack.quantity.should.equal 4
-
-        it 'returns the proper item for a late slot', ->
-            stack = recipe.getStackAtSlot(4)
-            stack.itemSlug.qualified.should.equal 'iron_gear'
-            stack.quantity.should.equal 1
-
-        it 'returns null for an invalid slot', ->
-            expect(recipe.getStackAtSlot(12)).to.be.null
-
-    describe '_parsePattern', ->
-
-        beforeEach ->
-            recipe = new Recipe
-                itemSlug:  'oak_wood_planks',
-                input: [new Stack itemSlug:new ItemSlug('oak_wood')],
-                pattern:'... .0. ...'
-
-        it 'normalizes invalid characters', ->
-            recipe._parsePattern('$$0 #() 010').should.equal '..0 ... 010'
-
-        it 'removes extra characters', ->
-            recipe._parsePattern('000 000 000 000').should.equal '000 000 000'
-
-        it 'fills in missing characters', ->
-            recipe._parsePattern('000000').should.equal '000 000 ...'
-
-        it 'fills in spaces', ->
-            recipe._parsePattern('000000000').should.equal '000 000 000'
+            it "determines the correct dimentions", ->
+                @recipe.depth.should.equal 3
+                @recipe.height.should.equal 3
+                @recipe.width.should.equal 3

src/client/models/game/stack.coffee

@@ -5,19 +5,38 @@
 # All rights reserved.
 #
 
-BaseModel = require '../base_model'
-
 ########################################################################################################################
 
-module.exports = class Stack extends BaseModel
+module.exports = class Stack
 
-    constructor: (attributes={}, options={})->
-        if not attributes.itemSlug? then throw new Error 'attributes.itemSlug is required'
-        attributes.quantity ?= 1
-        options.logEvents   ?= false
-        super attributes, options
+    constructor: (attributes={})->
+        @item = attributes.item
+        @quantity = attributes.quantity
+
+    # Properties ###################################################################################
+
+    Object.defineProperties @prototype,
+
+        item:
+            get: -> return @_item
+            set: (item)->
+                if not item? then throw new Error "item is required"
+                if @_item is item then return
+                if @_item? then throw new Error "item cannot be reassigned"
+                @_item = item
+
+        modPack:
+            get: -> return @_item.modPack
+            set: -> throw new Error "modPack cannot be replaced"
+
+        quantity:
+            get: -> return @_quantity
+            set: (quantity)->
+                quantity = parseInt "#{quantity}"
+                quantity = if Number.isNaN(quantity) then 0 else Math.max(0, quantity)
+                @_quantity = quantity
 
     # Object Overrides #############################################################################
 
     toString: ->
-        return "#{@quantity} #{@itemSlug}"
+        return "Stack:#{@item}×#{@quantity}"

src/client/models/parsing/mod_pack_json.test.coffee

@@ -0,0 +1,124 @@
+#
+# Crafting Guide - mod_pack_json.test.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+fixtures = require "../fixtures"
+ModPackJsonFormatter = require "./mod_pack_json_formatter"
+ModPackJsonParser = require "./mod_pack_json_parser"
+
+########################################################################################################################
+
+describe "ModPackJsonParser & ModPackJsonFormatter", ->
+
+    beforeEach ->
+        @formatter = new ModPackJsonFormatter
+        @parser = new ModPackJsonParser
+
+        @modPack = fixtures.createModPack id:"alpha", displayName:"ALPHA"
+
+        @runTest = =>
+            @string1 = @formatter.format @modPack
+            @string2 = @formatter.format @parser.parse @string1
+            @result = @parser.parse @string2
+
+    describe "an empty modpack", ->
+
+        beforeEach -> @runTest()
+
+        it "can survive a round trip", ->
+            @string1.should.equal @string2
+
+        it "contains the modpack's own properties", ->
+            @result.id.should.equal @modPack.id
+            @result.displayName.should.equal @modPack.displayName
+
+        it "doesn't contain a mods list", ->
+            expect(@result.mods).to.beUndefined
+
+    describe "a modpack with a single mod", ->
+
+        beforeEach ->
+            @mod = fixtures.createMod modPack:@modPack, id:"bravo", displayName:"BRAVO"
+
+        describe "containing only a gatherable item", ->
+
+            beforeEach ->
+                @oakWood = fixtures.configureOakWood @mod
+                @runTest()
+
+            it "can survive a round trip", ->
+                @string1.should.equal @string2
+
+            it "contains the correct mod", ->
+                mod = @result.mods[@mod.id]
+                mod.displayName.should.equal @mod.displayName
+
+            it "contains the item", ->
+                item = @result.mods[@mod.id].items[@oakWood.id]
+                item.displayName.should.equal @oakWood.displayName
+
+        describe "containing a multi-step item & it's requirements", ->
+
+            beforeEach ->
+                @craftingTable = fixtures.configureCraftingTable @mod
+                @oakPlank = fixtures.configureOakPlank @mod
+                @runTest()
+
+            it "can survive a round trip", ->
+                @string1.should.equal @string2
+
+            it "contains oak planks", ->
+                item = @result.mods[@mod.id].items[@oakPlank.id]
+                item.displayName.should.equal @oakPlank.displayName
+
+            it "has the recipe for a crafting table", ->
+                recipe = @result.mods[@mod.id].items[@craftingTable.id].firstRecipe
+                recipe.getInputAt(0, 0).item.id.should.equal @oakPlank.id
+                recipe.getInputAt(0, 1).item.id.should.equal @oakPlank.id
+                recipe.getInputAt(1, 0).item.id.should.equal @oakPlank.id
+                recipe.getInputAt(1, 1).item.id.should.equal @oakPlank.id
+                recipe.output.quantity.should.equal 1
+
+        describe "containing a complex item which needs tools & it's requirements", ->
+
+            beforeEach ->
+                @cake = fixtures.configureCake @mod
+                @runTest()
+
+            it "can survive a round trip", ->
+                @string1.should.equal @string2
+
+            it "has the recipe for a cake", ->
+                recipe = @result.mods[@mod.id].items[@cake.id].firstRecipe
+
+    describe "a modpack with multiple mods", ->
+
+        beforeEach ->
+            @modA = fixtures.createMod modPack:@modPack, id:"bravo", displayName:"BRAVO"
+            @modB = fixtures.createMod modPack:@modPack, id:"charlie", displayName:"CHARLIE"
+
+        describe "where items are used in recipes crossing mods", ->
+
+            beforeEach ->
+                @stick     = fixtures.configureStick @modA
+                @ironIngot = fixtures.configureIronIngot @modA
+                @ironSword = fixtures.configureIronSword @modB
+                @runTest()
+
+            it "can survive a round trip", ->
+                @string1.should.equal @string2
+
+            it "has each item in the correct mod", ->
+                @result.mods[@modA.id].items[@ironIngot.id].displayName.should.equal @ironIngot.displayName
+                @result.mods[@modB.id].items[@ironSword.id].displayName.should.equal @ironSword.displayName
+
+            it "has the correct recipe for an iron sword", ->
+                recipe = @result.mods[@modB.id].items[@ironSword.id].firstRecipe
+                recipe.output.item.id.should.equal @ironSword.id
+                recipe.output.quantity.should.equal 1
+                recipe.getInputAt(1, 0).item.id.should.equal @ironIngot.id
+                recipe.getInputAt(1, 1).item.id.should.equal @ironIngot.id
+                recipe.getInputAt(1, 2).item.id.should.equal @stick.id

src/client/models/parsing/mod_pack_json_formatter.coffee

@@ -0,0 +1,101 @@
+#
+# Crafting Guide - mod_pack_json_formatter.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+########################################################################################################################
+
+module.exports = class ModPackJsonParser
+
+    constructor: ->
+        @_reset()
+
+    # Public Methods ###############################################################################
+
+    format: (modPack)->
+        @_reset()
+        return JSON.stringify @_formatModPack modPack
+
+    # Private Methods ##############################################################################
+
+    _formatItem: (item)->
+        result = {}
+        result.id = item.id
+        result.displayName = item.displayName
+
+        if item.isGatherable and item.firstRecipe?
+            result.gatherable = true
+
+        return result
+
+    _formatMod: (mod)->
+        result = {}
+        result.id = mod.id
+        result.displayName = mod.displayName
+
+        for itemId, item of mod.items
+            result.items ?= []
+            @_itemIndexById[item.id] = @_itemIndex++
+            result.items.push @_formatItem item
+
+        return result
+
+    _formatModPack: (modPack)->
+        result = {}
+        result.id = modPack.id
+        result.displayName = modPack.displayName
+
+        for modId, mod of modPack.mods
+            result.mods ?= []
+            result.mods.push @_formatMod mod
+
+        if result.mods?
+            for modResult in result.mods
+                for itemResult in modResult.items
+                    item = modPack.mods[modResult.id].items[itemResult.id]
+                    for recipeId, recipe of item.recipesAsPrimary
+                        itemResult.recipes ?= []
+                        itemResult.recipes.push @_formatRecipe recipe
+
+        return result
+
+    _formatRecipe: (recipe)->
+        result = {}
+        result.id = recipe.id
+
+        if recipe.output.quantity > 1
+            result.quantity = recipe.output.quantity
+
+        result.width = recipe.width
+        result.height = recipe.height
+        result.depth = recipe.depth if recipe.depth > 1
+        result.inputs = []
+
+        for x in [0...recipe.width]
+            for y in [0...recipe.height]
+                for z in [0...recipe.depth]
+                    inputStack = @_formatStack recipe.getInputAt x, y, z
+                    result.inputs.push inputStack
+
+        for itemId, stack of recipe.extras
+            result.extras ?= []
+            result.extras.push @_formatStack stack
+
+        for itemId, item of recipe.tools
+            result.tools ?= []
+            result.tools.push @_itemIndexById[itemId]
+
+        return result
+
+    _formatStack: (stack)->
+        return null unless stack?
+
+        itemIndex = @_itemIndexById[stack.item.id]
+        if stack.quantity is 1 then return itemIndex
+        return [itemIndex, stack.quantity]
+
+    _reset: ->
+        @_itemIndex = 0
+        @_itemIndexById = {}

src/client/models/parsing/mod_pack_json_parser.coffee

@@ -0,0 +1,164 @@
+#
+# Crafting Guide - mod_pack_json_parser.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+Item    = require "../game/item"
+Mod     = require "../game/mod"
+ModPack = require "../game/mod_pack"
+Recipe  = require "../game/recipe"
+Stack   = require "../game/stack"
+
+########################################################################################################################
+
+module.exports = class ModPackJsonParser
+
+    constructor: ->
+        @_reset()
+
+    # Public Methods ###############################################################################
+
+    parse: (arg, fileName=null)->
+        @_reset()
+        @_fileName = fileName
+
+        if _.isString arg
+            @_parseText arg
+        else
+            @_parseObject arg
+
+        return @_modPack
+
+    # Private Methods ##############################################################################
+
+    _parseInteger: (text, defaultValue)->
+        result = parseInt "#{text}"
+        result = if Number.isNaN result then defaultValue else result
+        return result
+
+    _parseText: (text)->
+        try
+            obj = JSON.parse text
+        catch error
+            @_throwError "could not parse JSON: #{error}"
+
+        @_parseObject obj
+
+    _parseObject: (obj)->
+        @_data = obj
+        @_parseModPack()
+        @_parseMods()
+        @_parseItems()
+        @_parseRecipes()
+
+    _parseModPack: ->
+        if not @_data? then @_throwError "there is no valid data"
+        if not @_data.id? then @_throwError "modPack requires an id"
+        if not @_data.displayName? then @_throwError "modPack requires a displayName"
+
+        @_modPack = new ModPack id:@_data.id, displayName:@_data.displayName
+
+    _parseMods: ->
+        return unless @_data.mods?
+
+        for modData, index in @_data.mods
+            @_location = "mods[#{index}]"
+            if not modData.id? then @_throwError "mod requires an id"
+            if not modData.displayName? then @_throwError "mod requires a displayName"
+
+            new Mod modPack:@_modPack, id:modData.id, displayName:modData.displayName
+
+    _parseItems: ->
+        return unless @_data.mods?
+
+        for modData in @_data.mods
+            continue unless modData.items?
+
+            mod = @_modPack.mods[modData.id]
+            for itemData, index in modData.items
+                @_location = "<#{mod.id}>.items[#{index}]"
+                if not itemData.id? then @_throwError "item requires an id"
+                if not itemData.displayName? then @_throwError "item requires a displayName"
+
+                item = new Item mod:mod, id:itemData.id, displayName:itemData.displayName
+                item.gatherable = itemData.gatherable if itemData.gatherable?
+                @_items.push item
+
+    _parseRecipes: ->
+        return unless @_data.mods?
+
+        for modData in @_data.mods
+            continue unless modData.items?
+
+            mod = @_modPack.mods[modData.id]
+            for itemData, index in modData.items
+                continue unless itemData.recipes?
+
+                item = mod.items[itemData.id]
+                for recipeData, index in itemData.recipes
+                    @_location = "<#{itemData.id}>.recipes[#{index}]"
+                    if not recipeData.id? then @_throwError "recipe requires id"
+                    if not recipeData.inputs? then @_throwError "recipe requires inputs"
+
+                    quantity = @_parseInteger recipeData.quantity, 1
+                    outputStack = new Stack item:item, quantity:quantity
+                    recipe = new Recipe id:recipeData.id, output:outputStack
+
+                    depth = @_parseInteger recipeData.depth, 1
+                    height = @_parseInteger recipeData.height, 3
+                    width = @_parseInteger recipeData.width, 3
+
+                    index = 0
+                    for x in [0...width]
+                        for y in [0...height]
+                            for z in [0...depth]
+                                stack = @_parseStack recipeData.inputs[index]
+                                if stack? then recipe.setInputAt x, y, z, stack
+                                index++
+
+                    if recipeData.extras
+                        for stackData in recipeData.extras
+                            recipe.addExtra @_parseStack stackData
+
+                    if recipeData.tools
+                        for index in recipeData.tools
+                            toolItem = @_items[index]
+                            if not toolItem? then @_throwError "there is no item #{index}"
+                            recipe.addTool toolItem
+
+    _parseStack: (stackData)->
+        return null unless stackData?
+        if _.isArray(stackData)
+            if stackData.length isnt 2 then @_throwError "input stacks must have an item index and a quantity"
+            index = stackData[0]
+            quantity = stackData[1]
+        else
+            index = stackData
+            quantity = 1
+
+        item = @_items[index]
+        if not item? then @_throwError "there is no item #{index}"
+
+        return new Stack item:item, quantity:quantity
+
+    _reset: ->
+        @_data = null
+        @_fileName = null
+        @_items = []
+        @_location = null
+        @_modPack = null
+
+    _throwError: (message, cause=null)->
+        if @_location? then message = "#{@_location}: #{message}"
+        if @_fileName? and @_location? then message = "@#{message}"
+        if @_fileName? then message = "#{@_fileName}#{message}"
+        if cause? then message = "#{message}: #{cause}"
+
+        error = new Error message
+        error.cause = cause if cause?
+        error.fileName = @_fileName if @_fileName?
+        error.location = @_location if @_location?
+
+        throw error

src/client/models/stores/mod_pack_store.coffee

@@ -0,0 +1,55 @@
+#
+# Crafting Guide - mod_pack_store.coffee
+#
+# Copyright © 2014-2016 by Redwood Labs
+# All rights reserved.
+#
+
+ModPackJsonParser = require "../parsing/mod_pack_json_parser"
+
+########################################################################################################################
+
+module.exports = class ModPackStore
+
+    constructor: ->
+        @_data    = {}
+        @_loading = {}
+        @_parser  = new ModPackJsonParser
+
+    # Class Methods ################################################################################
+
+    Object.defineProperties ModPackStore,
+        instance:
+            get: ->
+                @_instance ?= new ModPackStore
+                return @_instance
+            set: ->
+                throw new Error "cannot assign instance"
+
+    # Public Methods ###############################################################################
+
+    get: (modPackId)->
+        return @_data[modPackId]
+
+    load: (modPackId)->
+        if not @_loading[modPackId]?
+            @_loading[modPackId] = w.promise (resolve, reject)->
+                url = c.url.modPackArchive modPackId:modPackId
+
+                onError = (xhr, status, message)=>
+                    logger.error "failed to load mod pack #{modPackId}: #{status} — #{message}"
+                    reject new Error message
+
+                onSuccess = (data, status, xhr)=>
+                    logger.info "laoded mod pack: #{modPackId}"
+                    try
+                        @_parser.reset()
+                        modPack = @_parser.parse data, url
+                        @_data[modPack.id] = modPack
+                        resolve modPack
+                    catch error
+                        reject error
+
+                $.ajax dataType: "text", error: onError, success: onSuccess, url: url
+
+        return @_loading[modPackId]

src/client/site/site_controller.coffee

@@ -15,6 +15,7 @@ HeaderController   = require './header/header_controller'
 ImageLoader        = require './image_loader'
 Mod                = require '../models/game/mod'
 ModPack            = require '../models/game/mod_pack'
+ModPackStore       = require '../models/store/mod_pack_store'
 Router             = require './router'
 
 ########################################################################################################################
@@ -30,7 +31,6 @@ module.exports = class SiteController extends BaseController
         @client      = options.client
         @fileCache   = new FileCache c.url.modpackArchive()
         @imageLoader = new ImageLoader defaultUrl:'/images/unknown.png'
-        @modPack     = new ModPack {}, fileCache:@fileCache
         @router      = new Router this
         @storage     = options.storage
 
@@ -41,23 +41,6 @@ module.exports = class SiteController extends BaseController
 
     # Public Methods ###############################################################################
 
-    loadDefaultModPack: ->
-        makeResponder = (m)-> return ->
-            m.activeModVersion.fetch() if m.activeModVersion?
-
-        for modSlug, modData of c.defaultMods
-            mod = new Mod {slug:modSlug}, {fileCache:@fileCache}
-            mod.on c.event.change + ':activeModVersion', makeResponder mod
-            @storage.register "mod:#{mod.slug}", mod, 'activeVersion', modData.defaultVersion
-            mod.fetch()
-
-            @modPack.addMod mod
-
-        if global.env isnt 'prerender'
-            @modPack.once c.event.sync, =>
-                @$pageContent.removeClass 'hidden'
-                @$pageContentLoading.addClass 'hidden'
-
     loadCurrentUser: ->
         @client.getCurrentUser()
             .then (response)=>

src/common/constants.coffee

@@ -29,46 +29,6 @@ adsense.skyscraper.margin          = 24 # px
 adsense.skyscraper.slotIds         = ['7613920409', '9574673605', '3388539204']
 adsense.skyscraper.width           = 160 # px
 
-exports.defaultMods   = defaultMods = {}
-defaultMods.minecraft = { defaultVersion: '1.7.10' } # Minecraft must be first
-
-defaultMods.advanced_solar_panels = { defaultVersion: '3.5.1' }
-defaultMods.agricraft             = { defaultVersion: '1.4.6' }
-defaultMods.applied_energistics_2 = { defaultVersion: 'rv1-stable-1' }
-defaultMods.big_reactors          = { defaultVersion: '0.4.2A2' }
-defaultMods.buildcraft            = { defaultVersion: '1.7.18' }
-defaultMods.computercraft         = { defaultVersion: '1.74' }
-defaultMods.draconic_evolution    = { defaultVersion: '1.0.2h' }
-defaultMods.ender_storage         = { defaultVersion: '1.4.5.29' }
-defaultMods.enderio               = { defaultVersion: '2.2.7.325' }
-defaultMods.extra_cells           = { defaultVersion: '2.2.73b129' }
-defaultMods.extra_utilities       = { defaultVersion: '1.2.2' }
-defaultMods.forestry              = { defaultVersion: '3.4.0.7' }
-defaultMods.forge_multipart       = { defaultVersion: '1.2.0.345' }
-defaultMods.galacticraft          = { defaultVersion: '3.0.12.404' }
-defaultMods.hydraulicraft         = { defaultVersion: '2.1.242' }
-defaultMods.ic2_classic           = { defaultVersion: 'none' }
-defaultMods.industrial_craft_2    = { defaultVersion: '2.2.663' }
-defaultMods.iron_chests           = { defaultVersion: '6.0.62.742' }
-defaultMods.jabba                 = { defaultVersion: '1.2.1a' }
-defaultMods.logistics_pipes       = { defaultVersion: '0.9.3.100' }
-defaultMods.mekanism              = { defaultVersion: '7.1.1.127' }
-defaultMods.minefactory_reloaded  = { defaultVersion: '2.8.0RC8-86' }
-defaultMods.modular_powersuits    = { defaultVersion: '0.11.0-300-thermal-expansion' }
-defaultMods.opencomputers         = { defaultVersion: '1.5.22' }
-defaultMods.quantum_flux          = { defaultVersion: '1.3.4' }
-defaultMods.project_red           = { defaultVersion: '4.5.16.77' }
-defaultMods.redstone_arsenal      = { defaultVersion: '9.5.0' }
-defaultMods.railcraft             = { defaultVersion: '9.5.0' }
-defaultMods.simply_jetpacks       = { defaultVersion: '1.4.1' }
-defaultMods.solar_expansion       = { defaultVersion: '1.6a' }
-defaultMods.solar_flux            = { defaultVersion: '0.5b' }
-defaultMods.storage_drawers       = { defaultVersion: '1.7.10-1.6.2' }
-defaultMods.thermal_dynamics      = { defaultVersion: '1.7.10r1.2.0' }
-defaultMods.thermal_expansion     = { defaultVersion: '1.7.10r4.1.4' }
-defaultMods.thermal_foundation    = { defaultVersion: '1.7.10r1.2.5' }
-defaultMods.tinkers_construct     = { defaultVersion: '1.7.10-1.8.8' }
-
 exports.duration = duration = {}
 duration.snap    = 100
 duration.fast    = 200
@@ -119,6 +79,9 @@ login.clientIds =
     'staging':    '3d75ed772ce5004180d6'
     'production': 'ce71be7f66926ff6ff38'
 
+exports.modpack = modpack = {}
+modpack.default = "crafting-guide-default"
+
 exports.modelState  = modelState = {}
 modelState.unloaded = 'unloaded'
 modelState.loading  = 'loading'
@@ -186,7 +149,7 @@ url.login            = _.template "/login"
 url.mod              = _.template "/browse/<%= modSlug %>/"
 url.modData          = _.template "/data/<%= modSlug %>/mod.cg"
 url.modIcon          = _.template "/data/<%= modSlug %>/icon.png"
-url.modpackArchive   = _.template "/data/modpack.cg"
+url.modPackData      = _.template "/data/<%= modPackId %>/modpack.json"
 url.modVersionData   = _.template "/data/<%= modSlug %>/versions/<%= modVersion %>/mod-version.cg"
 url.root             = _.template "/"
 url.tutorial         = _.template "/browse/<%= modSlug %>/tutorials/<%= tutorialSlug %>/"