Vector = require './vector' Rectangle = require './rectangle' Ellipse = require './ellipse' LineSegment = require './line_segment' WorldFrame = require './world_frame' Thang = require './thang' ThangState = require './thang_state' Rand = require './rand' WorldScriptNote = require './world_script_note' {now, consolidateThangs, typedArraySupport} = require './world_utils' Component = require 'lib/world/component' System = require 'lib/world/system' PROGRESS_UPDATE_INTERVAL = 100 DESERIALIZATION_INTERVAL = 10 REAL_TIME_BUFFER_MIN = 2 * PROGRESS_UPDATE_INTERVAL REAL_TIME_BUFFER_MAX = 3 * PROGRESS_UPDATE_INTERVAL REAL_TIME_BUFFERED_WAIT_INTERVAL = 0.5 * PROGRESS_UPDATE_INTERVAL REAL_TIME_COUNTDOWN_DELAY = 3000 # match CountdownScreen ITEM_ORIGINAL = '53e12043b82921000051cdf9' module.exports = class World @className: 'World' age: 0 ended: false preloading: false # Whether we are just preloading a world in case we soon cast it debugging: false # Whether we are just rerunning to debug a world we've already cast headless: false # Whether we are just simulating for goal states instead of all serialized results framesSerializedSoFar: 0 apiProperties: ['age', 'dt'] realTimeBufferMax: REAL_TIME_BUFFER_MAX / 1000 constructor: (@userCodeMap, classMap) -> # classMap is needed for deserializing Worlds, Thangs, and other classes @classMap = classMap ? {Vector: Vector, Rectangle: Rectangle, Thang: Thang, Ellipse: Ellipse, LineSegment: LineSegment} Thang.resetThangIDs() @userCodeMap ?= {} @thangs = [] @thangMap = {} @systems = [] @systemMap = {} @scriptNotes = [] @flagHistory = [] @rand = new Rand 0 # Existence System may change this seed @frames = [new WorldFrame(@, 0)] destroy: -> @goalManager?.destroy() thang.destroy() for thang in @thangs @[key] = undefined for key of @ @destroyed = true @destroy = -> getFrame: (frameIndex) -> # Optimize it a bit--assume we have all if @ended and are at the previous frame otherwise frames = @frames if @ended frame = frames[frameIndex] else if frameIndex frame = frames[frameIndex - 1].getNextFrame() frames.push frame else frame = frames[0] @age = frameIndex * @dt frame getThangByID: (id) -> @thangMap[id] setThang: (thang) -> for old, i in @thangs if old.id is thang.id @thangs[i] = thang @thangMap[thang.id] = thang thangDialogueSounds: (startFrame=0) -> return [] unless startFrame < @frames.length [sounds, seen] = [[], {}] for frameIndex in [startFrame ... @frames.length] frame = @frames[frameIndex] for thangID, state of frame.thangStateMap continue unless state.thang.say and sayMessage = state.getStateForProp 'sayMessage' soundKey = state.thang.spriteName + ':' + sayMessage unless seen[soundKey] sounds.push [state.thang.spriteName, sayMessage] seen[soundKey] = true sounds setGoalManager: (@goalManager) -> addError: (error) -> (@runtimeErrors ?= []).push error (@unhandledRuntimeErrors ?= []).push error loadFrames: (loadedCallback, errorCallback, loadProgressCallback, skipDeferredLoading, loadUntilFrame) -> return if @aborted console.log 'Warning: loadFrames called on empty World (no thangs).' unless @thangs.length continueLaterFn = => @loadFrames(loadedCallback, errorCallback, loadProgressCallback, skipDeferredLoading, loadUntilFrame) unless @destroyed if @realTime and not @countdownFinished return setTimeout @finishCountdown(continueLaterFn), REAL_TIME_COUNTDOWN_DELAY t1 = now() @t0 ?= t1 @worldLoadStartTime ?= t1 @lastRealTimeUpdate ?= 0 frameToLoadUntil = if loadUntilFrame then loadUntilFrame + 1 else @totalFrames # Might stop early if debugging. i = @frames.length while i < frameToLoadUntil and i < @totalFrames return unless @shouldContinueLoading t1, loadProgressCallback, skipDeferredLoading, continueLaterFn @adjustFlowSettings loadUntilFrame if @debugging try @getFrame(i) ++i # Increment this after we have succeeded in getting the frame, otherwise we'll have to do that frame again catch error @addError error # Not an Aether.errors.UserCodeError; maybe we can't recover unless @preloading or @debugging for error in (@unhandledRuntimeErrors ? []) return unless errorCallback error # errorCallback tells us whether the error is recoverable @unhandledRuntimeErrors = [] @finishLoadingFrames loadProgressCallback, loadedCallback finishLoadingFrames: (loadProgressCallback, loadedCallback) -> unless @debugging @ended = true system.finish @thangs for system in @systems unless @preloading loadProgressCallback? 1 loadedCallback() finishCountdown: (continueLaterFn) -> => return if @destroyed @countdownFinished = true continueLaterFn() shouldDelayRealTimeSimulation: (t) -> return false unless @realTime timeSinceStart = t - @worldLoadStartTime timeLoaded = @frames.length * @dt * 1000 timeBuffered = timeLoaded - timeSinceStart timeBuffered > REAL_TIME_BUFFER_MAX shouldUpdateRealTimePlayback: (t) -> return false unless @realTime return false if @frames.length * @dt is @lastRealTimeUpdate timeLoaded = @frames.length * @dt * 1000 timeSinceStart = t - @worldLoadStartTime remainingBuffer = @lastRealTimeUpdate * 1000 - timeSinceStart remainingBuffer < REAL_TIME_BUFFER_MIN shouldContinueLoading: (t1, loadProgressCallback, skipDeferredLoading, continueLaterFn) -> t2 = now() if @realTime shouldUpdateProgress = @shouldUpdateRealTimePlayback t2 shouldDelayRealTimeSimulation = not shouldUpdateProgress and @shouldDelayRealTimeSimulation t2 else shouldUpdateProgress = t2 - t1 > PROGRESS_UPDATE_INTERVAL shouldDelayRealTimeSimulation = false return true unless shouldUpdateProgress or shouldDelayRealTimeSimulation # Stop loading frames for now; continue in a moment. if shouldUpdateProgress @lastRealTimeUpdate = @frames.length * @dt if @realTime #console.log 'we think it is now', (t2 - @worldLoadStartTime) / 1000, 'so delivering', @lastRealTimeUpdate loadProgressCallback? @frames.length / @totalFrames unless @preloading t1 = t2 if t2 - @t0 > 1000 console.log ' Loaded', @frames.length, 'of', @totalFrames, '(+' + (t2 - @t0).toFixed(0) + 'ms)' unless @realTime @t0 = t2 if skipDeferredLoading continueLaterFn() else delay = if shouldDelayRealTimeSimulation then REAL_TIME_BUFFERED_WAIT_INTERVAL else 0 setTimeout continueLaterFn, delay false adjustFlowSettings: (loadUntilFrame) -> for thang in @thangs when thang.isProgrammable userCode = @userCodeMap[thang.id] ? {} for methodName, aether of userCode framesToLoadFlowBefore = if methodName is 'plan' or methodName is 'makeBid' then 200 else 1 # Adjust if plan() is taking even longer aether._shouldSkipFlow = @frames.length < loadUntilFrame - framesToLoadFlowBefore finalizePreload: (loadedCallback) -> @preloading = false loadedCallback() if @ended abort: -> @aborted = true addFlagEvent: (flagEvent) -> @flagHistory.push flagEvent loadFromLevel: (level, willSimulate=true) -> @levelComponents = level.levelComponents @thangTypes = level.thangTypes @loadSystemsFromLevel level @loadThangsFromLevel level, willSimulate @loadScriptsFromLevel level system.start @thangs for system in @systems loadSystemsFromLevel: (level) -> # Remove old Systems @systems = [] @systemMap = {} # Load new Systems for levelSystem in level.systems systemModel = levelSystem.model config = levelSystem.config systemClass = @loadClassFromCode systemModel.js, systemModel.name, 'system' #console.log "using db system class ---\n", systemClass, "\n--- from code ---n", systemModel.js, "\n---" system = new systemClass @, config @addSystems system null loadThangsFromLevel: (level, willSimulate) -> # Remove old Thangs @thangs = [] @thangMap = {} # Load new Thangs toAdd = (@loadThangFromLevel thangConfig, level.levelComponents, level.thangTypes for thangConfig in level.thangs ? []) @extraneousThangs = consolidateThangs toAdd if willSimulate # Combine walls, for example; serialize the leftovers later @addThang thang for thang in toAdd null loadThangFromLevel: (thangConfig, levelComponents, thangTypes, equipBy=null) -> components = [] for component in thangConfig.components componentModel = _.find levelComponents, (c) -> c.original is component.original and c.version.major is (component.majorVersion ? 0) componentClass = @loadClassFromCode componentModel.js, componentModel.name, 'component' components.push [componentClass, component.config] if equipBy and component.original is ITEM_ORIGINAL component.config.ownerID = equipBy thangTypeOriginal = thangConfig.thangType thangTypeModel = _.find thangTypes, (t) -> t.original is thangTypeOriginal return console.error thangConfig.id ? equipBy, 'could not find ThangType for', thangTypeOriginal unless thangTypeModel thangTypeName = thangTypeModel.name thang = new Thang @, thangTypeName, thangConfig.id try thang.addComponents components... catch e console.error 'couldn\'t load components for', thangTypeOriginal, thangConfig.id, 'because', e.toString(), e.stack thang addThang: (thang) -> @thangs.unshift thang # Interactions happen in reverse order of specification/drawing @setThang thang @updateThangState thang thang.updateRegistration() thang loadScriptsFromLevel: (level) -> @scriptNotes = [] @scripts = [] @addScripts level.scripts... loadClassFromCode: (js, name, kind='component') -> # Cache them based on source code so we don't have to worry about extra compilations @componentCodeClassMap ?= {} @systemCodeClassMap ?= {} map = if kind is 'component' then @componentCodeClassMap else @systemCodeClassMap c = map[js] return c if c try c = map[js] = eval js catch err console.error "Couldn't compile #{kind} code:", err, "\n", js c = map[js] = {} c.className = name c updateThangState: (thang) -> @frames[@frames.length-1].thangStateMap[thang.id] = thang.getState() size: -> @calculateBounds() unless @width? and @height? return [@width, @height] if @width? and @height? getBounds: -> @calculateBounds() unless @bounds? return @bounds calculateBounds: -> bounds = {left: 0, top: 0, right: 0, bottom: 0} hasLand = _.some @thangs, 'isLand' for thang in @thangs when thang.isLand or (not hasLand and thang.rectangle) # Look at Lands only rect = thang.rectangle().axisAlignedBoundingBox() bounds.left = Math.min(bounds.left, rect.x - rect.width / 2) bounds.right = Math.max(bounds.right, rect.x + rect.width / 2) bounds.bottom = Math.min(bounds.bottom, rect.y - rect.height / 2) bounds.top = Math.max(bounds.top, rect.y + rect.height / 2) @width = bounds.right - bounds.left @height = bounds.top - bounds.bottom @bounds = bounds [@width, @height] publishNote: (channel, event) -> event ?= {} channel = 'world:' + channel for script in @scripts continue if script.channel isnt channel scriptNote = new WorldScriptNote script, event continue if scriptNote.invalid @scriptNotes.push scriptNote return unless @goalManager @goalManager.submitWorldGenerationEvent(channel, event, @frames.length) getGoalState: (goalID) -> @goalManager.getGoalState(goalID) setGoalState: (goalID, status) -> @goalManager.setGoalState(goalID, status) endWorld: (victory=false, delay=3, tentative=false) -> @totalFrames = Math.min(@totalFrames, @frames.length + Math.floor(delay / @dt)) # end a few seconds later @victory = victory # TODO: should just make this signify the winning superteam @victoryIsTentative = tentative status = if @victory then 'won' else 'lost' @publishNote status console.log "The world ended in #{status} on frame #{@totalFrames}" addSystems: (systems...) -> @systems = @systems.concat systems for system in systems @systemMap[system.constructor.className] = system getSystem: (systemClassName) -> @systemMap?[systemClassName] addScripts: (scripts...) -> @scripts = (@scripts ? []).concat scripts addTrackedProperties: (props...) -> @trackedProperties = (@trackedProperties ? []).concat props serialize: -> # Code hotspot; optimize it startFrame = @framesSerializedSoFar endFrame = @frames.length #console.log "... world serializing frames from", startFrame, "to", endFrame, "of", @totalFrames [transferableObjects, nontransferableObjects] = [0, 0] o = {totalFrames: @totalFrames, maxTotalFrames: @maxTotalFrames, frameRate: @frameRate, dt: @dt, victory: @victory, userCodeMap: {}, trackedProperties: {}} o.trackedProperties[prop] = @[prop] for prop in @trackedProperties or [] for thangID, methods of @userCodeMap serializedMethods = o.userCodeMap[thangID] = {} for methodName, method of methods serializedMethods[methodName] = method.serialize?() ? method # serialize the method again if it has been deserialized t0 = now() o.trackedPropertiesThangIDs = [] o.trackedPropertiesPerThangIndices = [] o.trackedPropertiesPerThangKeys = [] o.trackedPropertiesPerThangTypes = [] trackedPropertiesPerThangValues = [] # We won't send these, just the offsets and the storage buffer o.trackedPropertiesPerThangValuesOffsets = [] # Needed to reconstruct ArrayBufferViews on other end, since Firefox has bugs transfering those: https://bugzilla.mozilla.org/show_bug.cgi?id=841904 and https://bugzilla.mozilla.org/show_bug.cgi?id=861925 # Actually, as of January 2014, it should be fixed. So we could try to undo the workaround. transferableStorageBytesNeeded = 0 nFrames = endFrame - startFrame streaming = nFrames < @totalFrames for thang in @thangs # Don't serialize empty trackedProperties for stateless Thangs which haven't changed (like obstacles). # Check both, since sometimes people mark stateless Thangs but then change them, and those should still be tracked, and the inverse doesn't work on the other end (we'll just think it doesn't exist then). # If streaming the world, a thang marked stateless that actually change will get messed up. I think. continue if thang.stateless and not _.some(thang.trackedPropertiesUsed, Boolean) o.trackedPropertiesThangIDs.push thang.id trackedPropertiesIndices = [] trackedPropertiesKeys = [] trackedPropertiesTypes = [] for used, propIndex in thang.trackedPropertiesUsed continue unless used trackedPropertiesIndices.push propIndex trackedPropertiesKeys.push thang.trackedPropertiesKeys[propIndex] trackedPropertiesTypes.push thang.trackedPropertiesTypes[propIndex] o.trackedPropertiesPerThangIndices.push trackedPropertiesIndices o.trackedPropertiesPerThangKeys.push trackedPropertiesKeys o.trackedPropertiesPerThangTypes.push trackedPropertiesTypes trackedPropertiesPerThangValues.push [] o.trackedPropertiesPerThangValuesOffsets.push [] for type in trackedPropertiesTypes transferableStorageBytesNeeded += ThangState.transferableBytesNeededForType(type, nFrames) if typedArraySupport o.storageBuffer = new ArrayBuffer(transferableStorageBytesNeeded) else o.storageBuffer = [] storageBufferOffset = 0 for trackedPropertiesValues, thangIndex in trackedPropertiesPerThangValues trackedPropertiesValuesOffsets = o.trackedPropertiesPerThangValuesOffsets[thangIndex] for type, propIndex in o.trackedPropertiesPerThangTypes[thangIndex] [storage, bytesStored] = ThangState.createArrayForType type, nFrames, o.storageBuffer, storageBufferOffset trackedPropertiesValues.push storage trackedPropertiesValuesOffsets.push storageBufferOffset ++transferableObjects if bytesStored ++nontransferableObjects unless bytesStored if typedArraySupport storageBufferOffset += bytesStored else # Instead of one big array with each storage as a view into it, they're all separate, so let's keep 'em around for flattening. storageBufferOffset += storage.length o.storageBuffer.push storage o.specialKeysToValues = [null, Infinity, NaN] # Whatever is in specialKeysToValues index 0 will be default for anything missing, so let's make sure it's null. # Don't think we can include undefined or it'll be treated as a sparse array; haven't tested performance. o.specialValuesToKeys = {} for specialValue, i in o.specialKeysToValues o.specialValuesToKeys[specialValue] = i t1 = now() o.frameHashes = [] for frameIndex in [startFrame ... endFrame] o.frameHashes.push @frames[frameIndex].serialize(frameIndex - startFrame, o.trackedPropertiesThangIDs, o.trackedPropertiesPerThangIndices, o.trackedPropertiesPerThangTypes, trackedPropertiesPerThangValues, o.specialValuesToKeys, o.specialKeysToValues) t2 = now() unless typedArraySupport flattened = [] for storage in o.storageBuffer for value in storage flattened.push value o.storageBuffer = flattened #console.log 'Allocating memory:', (t1 - t0).toFixed(0), 'ms; assigning values:', (t2 - t1).toFixed(0), 'ms, so', ((t2 - t1) / nFrames).toFixed(3), 'ms per frame for', nFrames, 'frames' #console.log 'Got', transferableObjects, 'transferable objects and', nontransferableObjects, 'nontransferable; stored', transferableStorageBytesNeeded, 'bytes transferably' o.thangs = (t.serialize() for t in @thangs.concat(@extraneousThangs ? [])) o.scriptNotes = (sn.serialize() for sn in @scriptNotes) if o.scriptNotes.length > 200 console.log 'Whoa, serializing a lot of WorldScriptNotes here:', o.scriptNotes.length {serializedWorld: o, transferableObjects: [o.storageBuffer], startFrame: startFrame, endFrame: endFrame} @deserialize: (o, classMap, oldSerializedWorldFrames, finishedWorldCallback, startFrame, endFrame, streamingWorld) -> # Code hotspot; optimize it #console.log 'Deserializing', o, 'length', JSON.stringify(o).length #console.log JSON.stringify(o) #console.log 'Got special keys and values:', o.specialValuesToKeys, o.specialKeysToValues perf = {} perf.t0 = now() nFrames = endFrame - startFrame w = streamingWorld ? new World o.userCodeMap, classMap [w.totalFrames, w.maxTotalFrames, w.frameRate, w.dt, w.scriptNotes, w.victory] = [o.totalFrames, o.maxTotalFrames, o.frameRate, o.dt, o.scriptNotes ? [], o.victory] w[prop] = val for prop, val of o.trackedProperties perf.t1 = now() if w.thangs.length for thangConfig in o.thangs when not w.thangMap[thangConfig.id] w.thangs.push thang = Thang.deserialize(thangConfig, w, classMap) w.setThang thang else w.thangs = (Thang.deserialize(thang, w, classMap) for thang in o.thangs) w.setThang thang for thang in w.thangs w.scriptNotes = (WorldScriptNote.deserialize(sn, w, classMap) for sn in o.scriptNotes) perf.t2 = now() o.trackedPropertiesThangs = (w.getThangByID thangID for thangID in o.trackedPropertiesThangIDs) o.trackedPropertiesPerThangValues = [] for trackedPropertyTypes, thangIndex in o.trackedPropertiesPerThangTypes o.trackedPropertiesPerThangValues.push (trackedPropertiesValues = []) trackedPropertiesValuesOffsets = o.trackedPropertiesPerThangValuesOffsets[thangIndex] for type, propIndex in trackedPropertyTypes storage = ThangState.createArrayForType(type, nFrames, o.storageBuffer, trackedPropertiesValuesOffsets[propIndex])[0] unless typedArraySupport # This could be more efficient i = trackedPropertiesValuesOffsets[propIndex] storage = o.storageBuffer.slice i, i + storage.length trackedPropertiesValues.push storage perf.t3 = now() perf.batches = 0 perf.framesCPUTime = 0 w.frames = [] unless streamingWorld clearTimeout @deserializationTimeout if @deserializationTimeout @deserializationTimeout = _.delay @deserializeSomeFrames, 1, o, w, finishedWorldCallback, perf, startFrame, endFrame # Spread deserialization out across multiple calls so the interface stays responsive @deserializeSomeFrames: (o, w, finishedWorldCallback, perf, startFrame, endFrame) => ++perf.batches startTime = now() for frameIndex in [w.frames.length ... endFrame] w.frames.push WorldFrame.deserialize(w, frameIndex - startFrame, o.trackedPropertiesThangIDs, o.trackedPropertiesThangs, o.trackedPropertiesPerThangKeys, o.trackedPropertiesPerThangTypes, o.trackedPropertiesPerThangValues, o.specialKeysToValues, o.frameHashes[frameIndex - startFrame], w.dt * frameIndex) elapsed = now() - startTime if elapsed > DESERIALIZATION_INTERVAL and frameIndex < endFrame - 1 #console.log " Deserialization not finished, let's do it again soon. Have:", w.frames.length, ", wanted from", startFrame, "to", endFrame perf.framesCPUTime += elapsed @deserializationTimeout = _.delay @deserializeSomeFrames, 1, o, w, finishedWorldCallback, perf, startFrame, endFrame return @deserializationTimeout = null perf.framesCPUTime += elapsed @finishDeserializing w, finishedWorldCallback, perf, startFrame, endFrame @finishDeserializing: (w, finishedWorldCallback, perf, startFrame, endFrame) -> perf.t4 = now() w.ended = true nFrames = endFrame - startFrame totalCPUTime = perf.t3 - perf.t0 + perf.framesCPUTime #console.log 'Deserialization:', totalCPUTime.toFixed(0) + 'ms (' + (totalCPUTime / nFrames).toFixed(3) + 'ms per frame).', perf.batches, 'batches. Did', startFrame, 'to', endFrame, 'in', (perf.t4 - perf.t0).toFixed(0) + 'ms wall clock time.' if false console.log ' Deserializing--constructing new World:', (perf.t1 - perf.t0).toFixed(2) + 'ms' console.log ' Deserializing--Thangs and ScriptNotes:', (perf.t2 - perf.t1).toFixed(2) + 'ms' console.log ' Deserializing--reallocating memory:', (perf.t3 - perf.t2).toFixed(2) + 'ms' console.log ' Deserializing--WorldFrames:', (perf.t4 - perf.t3).toFixed(2) + 'ms wall clock time,', (perf.framesCPUTime).toFixed(2) + 'ms CPU time' finishedWorldCallback w findFirstChangedFrame: (oldWorld) -> return 0 unless oldWorld for newFrame, i in @frames oldFrame = oldWorld.frames[i] break unless oldFrame and ((newFrame.hash is oldFrame.hash) or not newFrame.hash? or not oldFrame.hash?) # undefined gets in there when streaming at the last frame of each batch for some reason firstChangedFrame = i if @frames.length is @totalFrames if @frames[i] console.log 'First changed frame is', firstChangedFrame, 'with hash', @frames[i].hash, 'compared to', oldWorld.frames[i]?.hash else console.log 'No frames were changed out of all', @frames.length firstChangedFrame pointsForThang: (thangID, frameStart=0, frameEnd=null, camera=null, resolution=4) -> # Optimized @pointsForThangCache ?= {} cacheKey = thangID allPoints = @pointsForThangCache[cacheKey] unless allPoints allPoints = [] lastFrameIndex = @frames.length - 1 lastPos = x: null, y: null for frameIndex in [lastFrameIndex .. 0] by -1 frame = @frames[frameIndex] if pos = frame.thangStateMap[thangID]?.getStateForProp 'pos' pos = camera.worldToSurface {x: pos.x, y: pos.y} if camera # without z if not lastPos.x? or (Math.abs(lastPos.x - pos.x) + Math.abs(lastPos.y - pos.y)) > 1 lastPos = pos allPoints.push lastPos.y, lastPos.x unless lastPos.y is 0 and lastPos.x is 0 allPoints.reverse() @pointsForThangCache[cacheKey] = allPoints points = [] [lastX, lastY] = [null, null] for frameIndex in [Math.floor(frameStart / resolution) ... Math.ceil(frameEnd / resolution)] x = allPoints[frameIndex * 2 * resolution] y = allPoints[frameIndex * 2 * resolution + 1] continue if x is lastX and y is lastY lastX = x lastY = y points.push x, y points actionsForThang: (thangID, keepIdle=false) -> # Optimized @actionsForThangCache ?= {} cacheKey = thangID + '_' + Boolean(keepIdle) cached = @actionsForThangCache[cacheKey] return cached if cached states = (frame.thangStateMap[thangID] for frame in @frames) actions = [] lastAction = '' for state, i in states action = state?.getStateForProp 'action' continue unless action and (action isnt lastAction or state.actionActivated) continue unless state.action isnt 'idle' or keepIdle actions.push {frame: i, pos: state.pos, name: action} lastAction = action @actionsForThangCache[cacheKey] = actions return actions getTeamColors: -> teamConfigs = @teamConfigs or {} colorConfigs = {} colorConfigs[teamName] = config.color for teamName, config of teamConfigs colorConfigs teamForPlayer: (n) -> playableTeams = @playableTeams ? ['humans'] playableTeams[n % playableTeams.length]