codecombat/app/lib/surface/SegmentedSprite.coffee

SpriteBuilder = require 'lib/sprites/SpriteBuilder'

# Put this on MovieClips
specialGoToAndStop = (frame) ->
  if frame is @currentFrame and @childrenCopy
    @addChild(@childrenCopy...)
  else
    @gotoAndStop(frame)
    @childrenCopy = @children.slice(0)

module.exports = class SegmentedSprite extends createjs.SpriteContainer
  childMovieClips: null

  constructor: (@spriteSheet, @thangType, @spriteSheetPrefix, @resolutionFactor=SPRITE_RESOLUTION_FACTOR) ->
    @spriteSheet.mcPool ?= {}
    super(@spriteSheet)
    @addEventListener 'tick', @handleTick

  destroy: ->
    @handleTick = undefined
    @baseMovieClip.inUse = false if @baseMovieClip
    @removeAllEventListeners()
  
  # CreateJS.Sprite-like interface
    
  play: -> @paused = false unless @baseMovieClip and @animLength > 1
  stop: -> @paused = true
  gotoAndPlay: (actionName) -> @goto(actionName, false)
  gotoAndStop: (actionName) -> @goto(actionName, true)
  
  goto: (actionName, @paused=true) ->
    @removeAllChildren()
    @currentAnimation = actionName
    @baseMovieClip.inUse = false if @baseMovieClip
    if @childMovieClips
      mc.inUse = false for mc in @childMovieClips
    @childMovieClips = @baseMovieClip = @framerate = @animLength = null
    @actionNotSupported = false

    action = @thangType.getActions()[actionName]
    randomStart = actionName.startsWith('move')
    
    # because the resulting segmented image is set to the size of the movie clip, you can use
    # the raw registration data without scaling it.
    reg = action.positions?.registration or @thangType.get('positions')?.registration or {x:0, y:0}
    
    if action.animation
      @regX = -reg.x
      @regY = -reg.y
      @framerate = (action.framerate ? 20) * (action.speed ? 1)
      @childMovieClips = []
      @baseMovieClip = @buildMovieClip(action.animation)
      @baseMovieClip.inUse = true
      @frames = action.frames
      @frames = (parseInt(f) for f in @frames.split(',')) if @frames
      @animLength = if @frames then @frames.length else @baseMovieClip.timeline.duration
      @paused = true if @animLength is 1
      
      if @frames
        if randomStart
          @currentFrame = @frames[_.random(@frames.length - 1)]
        else
          @currentFrame = @frames[0]
      else
        if randomStart
          @currentFrame = then Math.floor(Math.random() * @animLength)
        else 
          @currentFrame = 0

      @baseMovieClip.specialGoToAndStop(@currentFrame)
      for movieClip in @childMovieClips
        if movieClip.mode is 'single'
          movieClip.specialGoToAndStop(movieClip.startPosition)
        else
          movieClip.specialGoToAndStop(@currentFrame)
          
      @takeChildrenFromMovieClip(@baseMovieClip, @)
      @loop = action.loops isnt false
      @goesTo = action.goesTo
      @notifyActionNeedsRender(action) if @actionNotSupported
      @scaleX = @scaleY = action.scale ? @thangType.get('scale') ? 1
      
    else if action.container
      # All transformations will be done to the child sprite
      @regX = @regY = 0
      @scaleX = @scaleY = 1

      @childMovieClips = []
      containerName = @spriteSheetPrefix + action.container
      sprite = new createjs.Sprite(@spriteSheet)
      sprite.gotoAndStop(containerName)
      if sprite.currentFrame is 0 or @usePlaceholders
        sprite.gotoAndStop(0)
        @notifyActionNeedsRender(action)
        bounds = @thangType.get('raw').containers[action.container].b
        actionScale = (action.scale ? @thangType.get('scale') ? 1)
        sprite.scaleX = actionScale * bounds[2] / (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor)
        sprite.scaleY = actionScale * bounds[3] / (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor)
        sprite.regX = (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor) * ((-reg.x - bounds[0]) / bounds[2])
        sprite.regY = (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor) * ((-reg.y - bounds[1]) / bounds[3])
      else
        scale = @resolutionFactor * (action.scale ? @thangType.get('scale') ? 1)
        sprite.regX = -reg.x * scale
        sprite.regY = -reg.y * scale
        sprite.scaleX = sprite.scaleY = 1 / @resolutionFactor
      @children = []
      @addChild(sprite)
      
    else if action.goesTo
      @goto(action.goesTo, @paused)
      return
      
    @scaleX *= -1 if action.flipX
    @scaleY *= -1 if action.flipY
    @baseScaleX = @scaleX
    @baseScaleY = @scaleY
    return
    
  notifyActionNeedsRender: (action) ->
    @lank?.trigger('action-needs-render', @lank, action)

  buildMovieClip: (animationName, mode, startPosition, loops) ->
    key = JSON.stringify([@spriteSheetPrefix].concat(arguments))
    @spriteSheet.mcPool[key] ?= []
    for mc in @spriteSheet.mcPool[key]
      if not mc.inUse
        mc.gotoAndStop(mc.currentFrame+0.01) # just to make sure it has its children back
        @childMovieClips = mc.childMovieClips
        return mc
    
    raw = @thangType.get('raw')
    animData = raw.animations[animationName]
    @lastAnimData = animData

    locals = {}
    _.extend locals, @buildMovieClipContainers(animData.containers)
    _.extend locals, @buildMovieClipAnimations(animData.animations)

    toSkip = {}
    toSkip[shape.bn] = true for shape in animData.shapes
    toSkip[graphic.bn] = true for graphic in animData.graphics

    anim = new createjs.MovieClip()
    anim.initialize(mode ? createjs.MovieClip.INDEPENDENT, startPosition ? 0, loops ? true)
    anim.specialGoToAndStop = specialGoToAndStop

    for tweenData in animData.tweens
      stopped = false
      tween = createjs.Tween
      for func in tweenData
        args = $.extend(true, [], (func.a))
        if @dereferenceArgs(args, locals, toSkip) is false
#          console.debug 'Did not dereference args:', args
          stopped = true
          break
        tween = tween[func.n](args...)
      continue if stopped
      anim.timeline.addTween(tween)

    anim.nominalBounds = new createjs.Rectangle(animData.bounds...)
    if animData.frameBounds
      anim.frameBounds = (new createjs.Rectangle(bounds...) for bounds in animData.frameBounds)

    anim.childMovieClips = @childMovieClips
    
    @spriteSheet.mcPool[key].push(anim)
    return anim

  buildMovieClipContainers: (localContainers) ->
    map = {}
    for localContainer in localContainers
      outerContainer = new createjs.SpriteContainer(@spriteSheet)
      innerContainer = new createjs.Sprite(@spriteSheet)
      innerContainer.gotoAndStop(@spriteSheetPrefix + localContainer.gn)
      if innerContainer.currentFrame is 0 or @usePlaceholders
        innerContainer.gotoAndStop(0)
        @actionNotSupported = true
        bounds = @thangType.get('raw').containers[localContainer.gn].b
        innerContainer.x = bounds[0]
        innerContainer.y = bounds[1]
        innerContainer.scaleX = bounds[2] / (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor)
        innerContainer.scaleY = bounds[3] / (SPRITE_PLACEHOLDER_WIDTH * @resolutionFactor)
      else
        innerContainer.scaleX = innerContainer.scaleY = 1 / (@resolutionFactor * (@thangType.get('scale') or 1))
      outerContainer.addChild(innerContainer)
      outerContainer.setTransform(localContainer.t...)
      outerContainer._off = localContainer.o if localContainer.o?
      outerContainer.alpha = localContainer.al if localContainer.al?
      map[localContainer.bn] = outerContainer
    return map

  buildMovieClipAnimations: (localAnimations) ->
    map = {}
    for localAnimation in localAnimations
      animation = @buildMovieClip(localAnimation.gn, localAnimation.a...)
      animation.inUse = true
      animation.setTransform(localAnimation.t...)
      map[localAnimation.bn] = animation
      @childMovieClips.push(animation)
    return map

  dereferenceArgs: (args, locals, toSkip) ->
    for key, val of args
      if locals[val]
        args[key] = locals[val]
      else if val is null
        args[key] = {}
      else if _.isString(val) and val.indexOf('createjs.') is 0
        args[key] = eval(val) # TODO: Security risk
      else if _.isObject(val) or _.isArray(val)
        res = @dereferenceArgs(val, locals, toSkip)
        return res if res is false
      else if _.isString(val) and toSkip[val]
        return false
    return args

  handleTick: (e) =>
    if @lastTimeStamp
      @tick(e.timeStamp - @lastTimeStamp)
    @lastTimeStamp = e.timeStamp

  tick: (delta) ->
    return if @paused or not @baseMovieClip
    return @paused = true if @animLength is 1
    newFrame = @currentFrame + @framerate * delta / 1000

    if newFrame > @animLength
      if @goesTo
        @gotoAndPlay(@goesTo)
        return
      else if not @loop
        @paused = true
        newFrame = @animLength - 1
        _.defer => @dispatchEvent('animationend')
      else
        newFrame = newFrame % @animLength

    translatedFrame = newFrame

    if @frames
      prevFrame = Math.floor(newFrame)
      nextFrame = Math.ceil(newFrame)
      if prevFrame is nextFrame
        translatedFrame = @frames[newFrame]
      else if nextFrame is @frames.length
        translatedFrame = @frames[prevFrame]
      else
        # interpolate between frames
        pct = newFrame % 1
        newFrameIndex = @frames[prevFrame] + (pct * (@frames[nextFrame] - @frames[prevFrame]))
        translatedFrame = newFrameIndex

    @currentFrame = newFrame
    return if translatedFrame is @baseMovieClip.currentFrame

    @baseMovieClip.specialGoToAndStop(translatedFrame)
    for movieClip in @childMovieClips
      movieClip.specialGoToAndStop(if movieClip.mode is 'single' then movieClip.startPosition else newFrame)
      
    @children = []
    @takeChildrenFromMovieClip(@baseMovieClip, @)
    
  takeChildrenFromMovieClip: (movieClip, recipientContainer) ->
    for child in movieClip.childrenCopy
      if child instanceof createjs.MovieClip
        childRecipient = new createjs.SpriteContainer(@spriteSheet)
        @takeChildrenFromMovieClip(child, childRecipient)
        for prop in ['regX', 'regY', 'rotation', 'scaleX', 'scaleY', 'skewX', 'skewY', 'x', 'y']
          childRecipient[prop] = child[prop]
        recipientContainer.addChild(childRecipient)
      else
        recipientContainer.addChild(child)
    

#  _getBounds: createjs.SpriteContainer.prototype.getBounds
#  getBounds: -> @baseMovieClip?.getBounds() or @children[0]?.getBounds() or @_getBounds()