codecombat/app/lib/surface/Surface.coffee

CocoClass = require 'lib/CocoClass'
path = require './path'
Dropper = require './Dropper'
AudioPlayer = require 'lib/AudioPlayer'
{me} = require 'lib/auth'
Camera = require './Camera'
CameraBorder = require './CameraBorder'
Layer = require './Layer'
Letterbox = require './Letterbox'
Dimmer = require './Dimmer'
DebugDisplay = require './DebugDisplay'
CoordinateDisplay = require './CoordinateDisplay'
SpriteBoss = require './SpriteBoss'
PointChooser = require './PointChooser'
RegionChooser = require './RegionChooser'
MusicPlayer = require './MusicPlayer'

module.exports = Surface = class Surface extends CocoClass
  stage: null

  layers: null
  surfaceLayer: null
  surfaceTextLayer: null
  screenLayer: null
  gridLayer: null  # TODO: maybe

  spriteBoss: null

  debugDisplay: null
  currentFrame: 0
  lastFrame: null
  totalFramesDrawn: 0
  playing: true  # play vs. pause
  dead: false  # if we kill it for some reason
  imagesLoaded: false
  worldLoaded: false
  scrubbing: false
  debug: false

  defaults:
    wizards: true
    paths: true
    grid: false
    navigateToSelection: true
    choosing: false # 'point', 'region', 'ratio-region'
    coords: true
    playJingle: false
    showInvisible: false

  subscriptions:
    'level-disable-controls': 'onDisableControls'
    'level-enable-controls': 'onEnableControls'
    'level-set-playing': 'onSetPlaying'
    'level-set-debug': 'onSetDebug'
    'level-toggle-debug': 'onToggleDebug'
    'level-set-grid': 'onSetGrid'
    'level-toggle-grid': 'onToggleGrid'
    'level-set-time': 'onSetTime'
    'level-set-surface-camera': 'onSetCamera'
    'level:restarted': 'onLevelRestarted'
    'god:new-world-created': 'onNewWorld'
    'tome:cast-spells': 'onCastSpells'
    'level-set-letterbox': 'onSetLetterbox'

  shortcuts:
    '\\': 'onToggleDebug'
    'g': 'onToggleGrid'

  # external functions

  constructor: (@world, @canvas, givenOptions) ->
    super()
    @layers = []
    @options = _.clone(@defaults)
    @options = _.extend(@options, givenOptions) if givenOptions
    @initEasel()
    @initAudio()

  destroy: ->
    super()
    @dead = true
    createjs.Ticker.removeEventListener("tick", @tick)
    createjs.Sound.stop()
    layer.destroy() for layer in @layers
    @spriteBoss.destroy()
    @chooser?.destroy()
    @dimmer?.destroy()
    @stage.clear()
    @musicPlayer?.destroy()

  setWorld: (@world) ->
    @worldLoaded = true
    @world.getFrame(Math.min(@getCurrentFrame(), @world.totalFrames - 1)).restoreState() unless @options.choosing
    @spriteBoss.world = @world

    @showLevel()
    @updateState true if @loaded
    # TODO: synchronize both ways of choosing whether to show coords (@world via UI System or @options via World Select modal)
    if @world.showCoordinates and @options.coords
      @surfaceTextLayer.addChild new CoordinateDisplay camera: @camera
    @onFrameChanged()
    Backbone.Mediator.publish 'surface:world-set-up'

  setProgress: (progress, scrubDuration=500) ->
    progress = Math.max(Math.min(progress, 0.99), 0.0)

    @scrubbing = true
    onTweenEnd = =>
      @scrubbingTo = null
      @scrubbing = false
      @scrubbingPlaybackSpeed = null
      @fastForwarding = false

    if @scrubbingTo?
      # cut to the chase for existing tween
      createjs.Tween.removeTweens(@)
      @currentFrame = @scrubbingTo

    @scrubbingTo = parseInt(progress * @world.totalFrames)
    @scrubbingPlaybackSpeed = Math.sqrt(Math.abs(@scrubbingTo - @currentFrame) * @world.dt / (scrubDuration or 0.5))
    if scrubDuration
      t = createjs.Tween
        .get(@)
        .to({currentFrame:@scrubbingTo}, scrubDuration, createjs.Ease.sineInOut)
        .call(onTweenEnd)
      t.addEventListener('change', @playScrubbedSounds)
    else
      @currentFrame = @scrubbingTo
      @playScrubbedSounds()
      onTweenEnd()

    @updateState true
    @onFrameChanged()

  playScrubbedSounds: (e) =>
    # gotta play all the sounds, even when scrubbing!
    rising = @currentFrame > @lastFrame
    actualCurrentFrame = @currentFrame
    tempFrame = if rising then Math.ceil(@lastFrame) else Math.floor(@lastFrame)
    while true  # temporary fix to stop cacophony
      break if rising and tempFrame > actualCurrentFrame
      break if (not rising) and tempFrame < actualCurrentFrame
      @currentFrame = tempFrame
      frame = @world.getFrame(@getCurrentFrame())
      frame.restoreState()
      for thangID, sprite of @spriteBoss.sprites
        sprite.playSounds false, Math.max(0.05, Math.min(1, 1 / @scrubbingPlaybackSpeed))
      tempFrame += if rising then 1 else -1
    @currentFrame = actualCurrentFrame

    # TODO: are these needed, or perhaps do they duplicate things?
    @spriteBoss.update()
    @onFrameChanged()

  getCurrentFrame: ->
    return Math.max(0, Math.min(parseInt(@currentFrame), @world.totalFrames - 1))

  getProgress: -> @currentFrame / @world.totalFrames

  onLevelRestarted: (e) ->
    @setProgress 0, 0

  onSetCamera: (e) ->
    if e.thangID
      return unless target = @spriteBoss.spriteFor(e.thangID)?.displayObject
    else if e.pos
      target = @camera.worldToSurface e.pos
    else
      target = null
    @camera.setBounds e.bounds if e.bounds
    @cameraBorder.updateBounds @camera.bounds
    @camera.zoomTo target, e.zoom, e.duration

  setDisabled: (@disabled) ->
    @spriteBoss.disabled = @disabled

  onDisableControls: (e) ->
    return if e.controls and not ('surface' in e.controls)
    @setDisabled true
    @dimmer ?= new Dimmer camera: @camera, layer: @screenLayer
    @dimmer.setSprites @spriteBoss.sprites

  onEnableControls: (e) ->
    return if e.controls and not ('surface' in e.controls)
    @setDisabled false

  onSetLetterbox: (e) ->
    @setDisabled e.on

  onSetPlaying: (e) =>
    @playing = (e ? {}).playing ? true
    if @playing and @currentFrame >= (@world.totalFrames - 5)
      @currentFrame = 0
    if @fastForwarding and not @playing
      @setProgress @currentFrame / @world.totalFrames

  onSetTime: (e) =>
    toFrame = @currentFrame
    if e.time?
      @worldLifespan = @world.totalFrames / @world.frameRate
      e.ratio = e.time / @worldLifespan
    if e.ratio?
      toFrame = @world.totalFrames * e.ratio
    if e.frameOffset
      toFrame += e.frameOffset
    if e.ratioOffset
      toFrame += @world.totalFrames * e.ratioOffset
    unless _.isNumber(toFrame) and not _.isNaN(toFrame)
      return console.error('set-time event', e, 'produced invalid target frame', toFrame)
    @setProgress(toFrame / @world.totalFrames, e.scrubDuration)

  onFrameChanged: (force) ->
    @currentFrame = Math.min(@currentFrame, @world.totalFrames)
    @debugDisplay?.updateFrame @currentFrame
    return if @currentFrame is @lastFrame and not force
    progress = @getProgress()
    Backbone.Mediator.publish('surface:frame-changed',
      type: "frame-changed"
      selectedThang: @spriteBoss.selectedSprite?.thang
      progress: progress
      frame: @currentFrame
      world: @world
    )
    @lastFrame = @currentFrame

  onCastSpells: (event) ->
    createjs.Tween.removeTweens(@surfaceLayer)
    createjs.Tween.get(@surfaceLayer).to({alpha:0.9}, 1000, createjs.Ease.getPowOut(4.0))

  onNewWorld: (event) ->
    return unless event.world.name is @world.name
    fastForwardTo = null
    if @playing
      fastForwardTo = Math.min event.world.firstChangedFrame, @currentFrame
      @currentFrame = 0

    createjs.Tween.removeTweens(@surfaceLayer)
    f = =>
      @setWorld event.world
      @onFrameChanged(true)
      if fastForwardTo and @playing
        fastForwardToRatio = fastForwardTo / @world.totalFrames
        fastForwardToTime = fastForwardTo * @world.dt
        fastForwardSpeed = Math.max 4, fastForwardToTime / 3
        @setProgress fastForwardToRatio, 1000 * fastForwardToTime / fastForwardSpeed
        @fastForwarding = true
    createjs.Tween.get(@surfaceLayer)
      .to({alpha:0.0}, 50)
      .call(f)
      .to({alpha:1.0}, 2000, createjs.Ease.getPowOut(2.0))

  # initialization

  initEasel: ->
    # takes DOM objects, not jQuery objects
    @stage = new createjs.Stage(@canvas[0])
    canvasWidth = parseInt(@canvas.attr('width'), 10)
    canvasHeight = parseInt(@canvas.attr('height'), 10)
    @camera = new Camera canvasWidth, canvasHeight
    @layers.push @surfaceLayer = new Layer name: "Surface", layerPriority: 0, transform: Layer.TRANSFORM_SURFACE, camera: @camera
    @layers.push @surfaceTextLayer = new Layer name: "Surface Text", layerPriority: 1, transform: Layer.TRANSFORM_SURFACE_TEXT, camera: @camera
    @layers.push @screenLayer = new Layer name: "Screen", layerPriority: 2, transform: Layer.TRANSFORM_SCREEN, camera: @camera
    @stage.addChild @layers...
    @surfaceLayer.addChild @cameraBorder = new CameraBorder bounds: @camera.bounds
    @screenLayer.addChild new Letterbox canvasWidth: canvasWidth, canvasHeight: canvasHeight
    @spriteBoss = new SpriteBoss camera: @camera, surfaceLayer: @surfaceLayer, surfaceTextLayer: @surfaceTextLayer, world: @world, thangTypes: @options.thangTypes, choosing: @options.choosing, navigateToSelection: @options.navigateToSelection, showInvisible: @options.showInvisible
    @stage.enableMouseOver(10)
    @stage.addEventListener 'stagemousemove', @onMouseMove
    @stage.addEventListener 'stagemousedown', @onMouseDown
    @hookUpZoomControls()
    @hookUpChooseControls() if @options.choosing
    console.log "Setting fps", @world.frameRate unless @world.frameRate is 30
    createjs.Ticker.setFPS @world.frameRate

  showLevel: ->
    return if @dead
    return unless @worldLoaded
    return if @loaded
    @loaded = true
    @spriteBoss.createMarks()
    @spriteBoss.createIndieSprites @world.indieSprites, @options.wizards
    Backbone.Mediator.publish 'registrar-echo-states'
    @updateState true
    @drawCurrentFrame()
    @showGrid() if @options.grid  # TODO: pay attention to world grid setting (which we only know when world simulates)
    createjs.Ticker.addEventListener "tick", @tick
    Backbone.Mediator.publish 'level:started'

  initAudio: ->
    @musicPlayer = new MusicPlayer()

  # grid; should probably refactor into separate class

  showGrid: ->
    return if @gridShowing()
    unless @gridLayer
      @gridLayer = new createjs.Container()
      @gridShape = new createjs.Shape()
      @gridLayer.addChild @gridShape
      @gridLayer.z = 90019001
      @gridLayer.mouseEnabled = false
      @gridShape.alpha = 0.125
      @gridShape.graphics.beginStroke "blue"
      gridSize = Math.round(@world.size()[0] / 20)
      wopStart = x: 0, y: 0
      wopEnd = x: @world.size()[0], y: @world.size()[1]
      supStart = @camera.worldToSurface wopStart
      supEnd = @camera.worldToSurface wopEnd
      wop = x: wopStart.x, y: wopStart.y
      while wop.x < wopEnd.x
        sup = @camera.worldToSurface wop
        @gridShape.graphics.mt(sup.x, supStart.y).lt(sup.x, supEnd.y)
        t = new createjs.Text(wop.x.toFixed(0), "16px Arial", "blue")
        t.x = sup.x - t.getMeasuredWidth() / 2
        t.y = supStart.y - 10 - t.getMeasuredHeight() / 2
        t.alpha = 0.75
        @gridLayer.addChild t
        wop.x += gridSize
      while wop.y < wopEnd.y
        sup = @camera.worldToSurface wop
        @gridShape.graphics.mt(supStart.x, sup.y).lt(supEnd.x, sup.y)
        t = new createjs.Text(wop.y.toFixed(0), "16px Arial", "blue")
        t.x = 10 - t.getMeasuredWidth() / 2
        t.y = sup.y - t.getMeasuredHeight() / 2
        t.alpha = 0.75
        @gridLayer.addChild t
        wop.y += gridSize
      @gridShape.graphics.endStroke()
      bounds = @gridLayer.getBounds()
      return unless bounds?.width and bounds.height
      @gridLayer.cache bounds.x, bounds.y, bounds.width, bounds.height
    @surfaceLayer.addChild @gridLayer

  hideGrid: ->
    return unless @gridShowing()
    @gridLayer.parent.removeChild @gridLayer

  gridShowing: ->
    @gridLayer?.parent?

  onToggleGrid: ->
    if @gridShowing() then @hideGrid() else @showGrid()

  onSetGrid: (e) ->
    if e.grid then @showGrid() else @hideGrid()

  onToggleDebug: (e) ->
    e?.preventDefault()
    Backbone.Mediator.publish 'level-set-debug', {debug: not @debug}

  onSetDebug: (e) ->
    return if e.debug is @debug
    @debug = e.debug
    if @debug and not @debugDisplay
      @screenLayer.addChild @debugDisplay = new DebugDisplay canvasWidth: @camera.canvasWidth, canvasHeight: @camera.canvasHeight

  # uh

  onMouseMove: (e) =>
    return if @disabled
    Backbone.Mediator.publish 'surface:mouse-moved', x: e.stageX, y: e.stageY

  onMouseDown: (e) =>
    return if @disabled
    onBackground = not @stage.hitTest e.stageX, e.stageY
    Backbone.Mediator.publish 'surface:stage-mouse-down', onBackground: onBackground, x: e.stageX, y: e.stageY, originalEvent: e

  hookUpZoomControls: ->
    @canvas.bind 'mousewheel', (e) =>
      # https://github.com/brandonaaron/jquery-mousewheel
      e.preventDefault()
      return if @disabled
      Backbone.Mediator.publish 'surface:mouse-scrolled', deltaX: e.deltaX, deltaY: e.deltaY unless @disabled

  hookUpChooseControls: ->
    chooserOptions = stage: @stage, surfaceLayer: @surfaceLayer, camera: @camera, restrictRatio: @options.choosing is 'ratio-region'
    klass = if @options.choosing is 'point' then PointChooser else RegionChooser
    @chooser = new klass chooserOptions

  # Main Surface update loop

  tick: (e) =>
    # seems to be a bug where only one object can register with the Ticker...
    oldFrame = @currentFrame
    while true
      Dropper.tick()
      @trailmaster.tick() if @trailmaster
      # Skip some frame updates unless we're playing and not at end (or we haven't drawn much yet)
      frameAdvanced = (@playing and @currentFrame < @world.totalFrames) or @totalFramesDrawn < 2
      ++@currentFrame if frameAdvanced
      @updateSpriteSounds() if frameAdvanced
      break unless Dropper.drop()

    # these are skipped for dropped frames
    @updateState @currentFrame isnt oldFrame
    @drawCurrentFrame()
    @onFrameChanged()
    @updatePaths() if (@totalFramesDrawn % 2) is 0 or createjs.Ticker.getMeasuredFPS() > createjs.Ticker.getFPS() - 5
    Backbone.Mediator.publish('surface:ticked', {})
    mib = @stage.mouseInBounds
    if @mouseInBounds isnt mib
      Backbone.Mediator.publish('surface:mouse-' + (if mib then "over" else "out"), {})
      @mouseInBounds = mib

  updateSpriteSounds: ->
    @world.getFrame(@getCurrentFrame()).restoreState()
    @spriteBoss.updateSounds()

  updateState: (frameChanged) ->
    # world state must have been restored in @updateSpriteSounds
    @camera.updateZoom()
    @spriteBoss.update frameChanged
    @dimmer?.setSprites @spriteBoss.sprites

  drawCurrentFrame: ->
    ++@totalFramesDrawn
    @stage.update()

  # paths - TODO: move to SpriteBoss? but only update on frame drawing instead of on every frame update?

  updatePaths: ->
    return unless @options.paths
    @hidePaths()
    selectedThang = @spriteBoss.selectedSprite?.thang
    return if @world.showPaths is 'never'
    return if @world.showPaths is 'paused' and @playing
    return if @world.showPaths is 'selected' and not selectedThang
    @trailmaster ?= new path.Trailmaster @camera
    selectedOnly = @playing and @world.showPaths is "selected"
    @paths = @trailmaster.generatePaths @world, @getCurrentFrame(), selectedThang, @spriteBoss.sprites, selectedOnly
    @paths.name = 'paths'
    @spriteBoss.spriteLayers["Path"].addChild @paths

  hidePaths: ->
    return if not @paths
    @paths.parent.removeChild @paths
    @paths = null

  # Screenshot

  screenshot: (scale=0.25, format='image/jpeg', quality=0.8, zoom=2) ->
    # Quality doesn't work with image/png, just image/jpeg and image/webp
    [w, h] = [@camera.canvasWidth, @camera.canvasHeight]
    margin = (1 - 1 / zoom) / 2
    @stage.cache margin * w, margin * h, w / zoom, h / zoom, scale * zoom
    imageData = @stage.cacheCanvas.toDataURL(format, quality)
    #console.log "Screenshot with scale", scale, "format", format, "quality", quality, "was", Math.floor(imageData.length / 1024), "kB"
    screenshot = document.createElement("img")
    screenshot.src = imageData
    #$('body').append(screenshot)
    @stage.uncache()
    imageData