codecombat/app/lib/AudioPlayer.coffee

CocoClass = require 'lib/CocoClass'
cache = {}
{me} = require('lib/auth')

# Top 20 obscene words (plus 'fiddlesticks') will trigger swearing Simlish with *beeps*.
# Didn't like leaving so much profanity lying around in the source, so rot13'd.
rot13 = (s) -> s.replace /[A-z]/g, (c) -> String.fromCharCode c.charCodeAt(0) + (if c.toUpperCase() <= "M" then 13 else -13)
swears = (rot13 s for s in ["nefrubyr", "nffubyr", "onfgneq", "ovgpu", "oybbql", "obyybpxf", "ohttre", "pbpx", "penc", "phag", "qnza", "qnea", "qvpx", "qbhpur", "snt", "shpx", "cvff", "chffl", "fuvg", "fyhg", "svqqyrfgvpxf"])

createjs.Sound.registerPlugins([createjs.WebAudioPlugin, createjs.FlashPlugin, createjs.HTMLAudioPlugin])

class Manifest
  constructor: -> @storage = {}

  add: (filename, group='misc') ->
    name = name or filename
    @storage[group] = [] unless @storage[group]?
    return if filename in @storage[group]
    @storage[group].push(filename)

  addPrimarySound: (filename) -> @add(filename, 'primarySounds')
  addSecondarySound: (filename) -> @add(filename, 'secondarySounds')
  getData: -> return @storage

class Media
  constructor: (name) -> @name = name if name

  loaded: false
  data: null
  progress: 0.0
  error: null
  name: ''

class AudioPlayer extends CocoClass
  subscriptions:
    'play-sound': (e) -> @playInterfaceSound e.trigger

  constructor: () ->
    super()
    @ext = if createjs.Sound.getCapability('mp3') then '.mp3' else '.ogg'
    @listenToSound()
    @createNewManifest()
    @soundsToPlayWhenLoaded = {}

  createNewManifest: ->
    @manifest = new Manifest()

  listenToSound: ->
    # I would like to go through PreloadJS to organize loading by queue, but
    # when I try to set it up, I get an error with the Sound plugin.
    # So for now, we'll just load through SoundJS instead.
    createjs.Sound.on 'fileload', @onSoundLoaded

  # PUBLIC LOADING METHODS

  soundForDialogue: (message, soundTriggers) ->
    if _.isArray message then message = message.join ' '
    return message unless _.isString message
    return null unless say = soundTriggers?.say
    message = _.string.slugify message
    return sound if sound = say[message]
    defaults = say.defaultSimlish
    if say.swearingSimlish?.length and _.find(swears, (s) -> message.search(s) isnt -1)
      defaults = say.swearingSimlish
    return null unless defaults?.length
    return defaults[message.length % defaults.length]

  preloadInterfaceSounds: (names) ->
    for name in names
      filename = "/file/interface/#{name}#{@ext}"
      @preloadSound filename, name

  playInterfaceSound: (name) ->
    filename = "/file/interface/#{name}#{@ext}"
    if filename of cache and createjs.Sound.loadComplete filename
      @playSound name
      createjs.Sound.play name
    else
      @preloadInterfaceSounds [name] unless filename of cache
      @soundsToPlayWhenLoaded[name] = true
      
  playSound: (name) ->
    createjs.Sound.play name, {volume: me.get('volume')}

#  # TODO: load Interface sounds somehow, somewhere, somewhen

  preloadSoundReference: (sound) ->
    name = @nameForSoundReference sound
    filename = '/file/' + name
    @preloadSound filename, name
    filename

  nameForSoundReference: (sound) ->
    sound[@ext.slice(1)]  # mp3 or ogg

  preloadSound: (filename, name) ->
    return unless filename
    return if filename of cache
    name ?= filename
    # SoundJS flips out if you try to register the same file twice
    createjs.Sound.registerSound(filename, name, 1, true)  # 1: 1 channel, true: should preload
    cache[filename] = new Media(name)

  # PROGRESS CALLBACKS

  onSoundLoaded: (e) =>
    media = cache[e.src]
    return if not media
    media.loaded = true
    media.progress = 1.0
    if @soundsToPlayWhenLoaded[media.name]
      @playSound media.name
      @soundsToPlayWhenLoaded[media.name] = false
    @notifyProgressChanged()

  onSoundLoadError: (e) =>
    console.error 'Could not load sound', e

  notifyProgressChanged: ->
    Backbone.Mediator.publish('audio-player:loaded', {sender:@})

  getStatus: (src) ->
    return cache[src] or null


module.exports = new AudioPlayer()

average = (numbers) ->
  return 0 if numbers.length is 0
  sum = 0
  sum += num for num in numbers
  return sum / numbers.length