codecombat/app/lib/surface/Label.coffee

CocoClass = require 'lib/CocoClass'

module.exports = class Label extends CocoClass
  @STYLE_DIALOGUE = "dialogue"  # A speech bubble from a script
  @STYLE_SAY = "say"  # A piece of text generated from the world
  @STYLE_NAME = "name"  # A name like Scott set up for the Wizard
  # We might want to combine 'say' and 'name'; they're very similar
  # Nick designed 'say' based off of Scott's 'name' back when they were using two systems

  subscriptions: {}

  constructor: (options) ->
    super()
    options ?= {}
    @sprite = options.sprite
    @camera = options.camera
    @layer = options.layer
    @style = options.style ? Label.STYLE_SAY
    console.error @toString(), "needs a sprite." unless @sprite
    console.error @toString(), "needs a camera." unless @camera
    console.error @toString(), "needs a layer." unless @layer
    @setText options.text if options.text

  destroy: ->
    @setText null
    super()

  toString: -> "<Label for #{@sprite?.thang?.id ? 'None'}: #{@text?.substring(0, 10) ? ''}>"

  setText: (text) ->
    # Returns whether an update was actually performed
    return false if text is @text
    @text = text
    @build()
    true

  build: ->
    @layer.removeChild @background if @background
    @layer.removeChild @label if @label
    return unless @text  # null or '' should both be skipped
    o = @buildLabelOptions()
    @layer.addChild @label = @buildLabel o
    @layer.addChild @background = @buildBackground o
    @layer.updateLayerOrder()

  update: ->
    return unless @text
    offset = @sprite.getOffset? (if @style is 'dialogue' then 'mouth' else 'aboveHead')
    offset ?= x: 0, y: 0  # temp (if not CocoSprite)
    @label.x = @background.x = @sprite.displayObject.x + offset.x
    @label.y = @background.y = @sprite.displayObject.y + offset.y
    null

  buildLabelOptions: ->
    o = {}
    st = {dialogue: 'D', say: 'S', name: 'N'}[@style]
    o.marginX = {D: 5, S: 2, N: 3}[st]
    o.marginY = {D: 6, S: 2, N: 3}[st]
    o.shadow = {D: false, S: true, N: true}[st]
    o.fontSize = {D: 25, S: 19, N: 14}[st]
    fontFamily = {D: "Arial", S: "Arial", N: "Arial"}[st]
    o.fontDescriptor = "#{o.fontSize}px #{fontFamily}"
    o.fontColor = {D: "#000", S: "#000", N: "#00a"}[st]
    o.backgroundFillColor = {D: "white", S: "rgba(255, 255, 255, 0.2)", N: "rgba(255, 255, 255, 0.5)"}[st]
    o.backgroundStrokeColor = {D: "black", S: "rgba(0, 0, 0, 0.2)", N: "rgba(0, 0, 0, 0.0)"}[st]
    o.backgroundStrokeStyle = {D: 2, S: 1, N: 1}[st]
    o.backgroundBorderRadius = {D: 10, S: 5, N: 3}[st]
    o.layerPriority = {D: 10, S: 5, N: 5}[st]
    maxWidth = {D: 300, S: 300, N: 180}[st]
    maxWidth = Math.max @camera.canvasWidth / 2 - 100, maxWidth  # Does this do anything?
    maxLength = {D: 100, S: 100, N: 30}[st]
    multiline = @addNewLinesToText _.string.prune(@text, maxLength), o.fontDescriptor, maxWidth
    o.text = multiline.text
    o.textWidth = multiline.textWidth
    o

  buildLabel: (o) ->
    label = new createjs.Text o.text, o.fontDescriptor, o.fontColor
    label.lineHeight = o.fontSize + 2
    label.x = o.marginX
    label.y = o.marginY
    label.shadow = new createjs.Shadow "#FFF", 1, 1, 0 if o.shadow
    label.layerPriority = o.layerPriority
    label.name = "Sprite Label - #{@style}"
    o.textHeight = label.getMeasuredHeight()
    o.label = label
    label

  buildBackground: (o) ->
    w = o.textWidth + 2 * o.marginX
    h = o.textHeight + 2 * o.marginY + 1  # Is this +1 needed?

    background = new createjs.Shape()
    background.name = "Sprite Label Background - #{@style}"
    g = background.graphics
    g.beginFill o.backgroundFillColor
    g.beginStroke o.backgroundStrokeColor
    g.setStrokeStyle o.backgroundStrokeStyle

    if @style is 'dialogue'
      radius = o.backgroundBorderRadius  # Rounded rectangle border radius
      pointerHeight = 10  # Height of pointer triangle
      pointerWidth = 8  # Actual width of pointer triangle
      pointerWidth += radius  # Convenience value including pointer width and border radius

      # Figure out the position of the pointer for the bubble
      sup = x: @sprite.displayObject.x, y: @sprite.displayObject.y  # a little more accurate to aim for mouth--how?
      cap = @camera.surfaceToCanvas sup
      hPos = if cap.x / @camera.canvasWidth > 0.53 then 'right' else 'left'
      vPos = if cap.y / @camera.canvasHeight > 0.53 then 'bottom' else 'top'
      pointerPos = "#{vPos}-#{hPos}"
      # TODO: we should redo this when the Thang moves enough, not just when we change its text
      #return if pointerPos is @lastBubblePos and blurb is @lastBlurb

      # Draw a rounded rectangle with the pointer coming out of it
      g.moveTo(radius, 0)
      if pointerPos is 'top-left'
        g.lineTo(radius / 2, -pointerHeight)
        g.lineTo(pointerWidth, 0)
      else if pointerPos is 'top-right'
        g.lineTo(w - pointerWidth, 0)
        g.lineTo(w - radius / 2, -pointerHeight)

      # Draw top and right edges
      g.lineTo(w - radius, 0)
      g.quadraticCurveTo(w, 0, w, radius)
      g.lineTo(w, h - radius)
      g.quadraticCurveTo(w, h, w - radius, h)

      if pointerPos is 'bottom-right'
        g.lineTo(w - radius / 2, h + pointerHeight)
        g.lineTo(w - pointerWidth, h)
      else if pointerPos is 'bottom-left'
        g.lineTo(pointerWidth, h)
        g.lineTo(radius / 2, h + pointerHeight)

      # Draw bottom and left edges
      g.lineTo(radius, h)
      g.quadraticCurveTo(0, h, 0, h - radius)
      g.lineTo(0, radius)
      g.quadraticCurveTo(0, 0, radius, 0)

      # Center the container where the mouth of the speaker will be
      background.regX = if hPos is 'left' then 3 else o.textWidth + 3
      background.regY = if vPos is 'bottom' then h + pointerHeight else -pointerHeight

    else
      # Just draw a rounded rectangle
      background.regX = w / 2
      background.regY = h + 2  # Just above health bar, say
      g.drawRoundRect(o.label.x - o.marginX, o.label.y - o.marginY, w, h, o.backgroundBorderRadius)

    o.label.regX = background.regX - o.marginX
    o.label.regY = background.regY - o.marginY

    g.endStroke()
    g.endFill()
    background.layerPriority = o.layerPriority - 1
    background

  addNewLinesToText: (originalText, fontDescriptor, maxWidth=400) ->
    rows = []
    row = []
    words = _.string.words originalText
    textWidth = 0
    for word in words
      row.push(word)
      text = new createjs.Text(_.string.join(' ', row...), fontDescriptor, "#000")
      width = text.getMeasuredWidth()
      if width > maxWidth
        if row.length is 1 # one long word, truncate it
          row[0] = _.string.truncate(row[0], 40)
          rows.push(row)
          row = []
        else
          row.pop()
          rows.push(row)
          row = [word]
      else
        textWidth = Math.max(textWidth, width)
    rows.push(row)
    for row, i in rows
      rows[i] = _.string.join(" ", row...)
    text: _.string.join("\n", rows...), textWidth: textWidth