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/*
 * blueimp Gallery YouTube Video Factory JS
 * https://github.com/blueimp/Gallery
 *
 * Copyright 2013, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * https://opensource.org/licenses/MIT
 */

/* global define, window, document, YT */

;(function (factory) {
  'use strict'
  if (typeof define === 'function' && define.amd) {
    // Register as an anonymous AMD module:
    define([
      './blueimp-helper',
      './blueimp-gallery-video'
    ], factory)
  } else {
    // Browser globals:
    factory(
      window.blueimp.helper || window.jQuery,
      window.blueimp.Gallery
    )
  }
}(function ($, Gallery) {
  'use strict'

  if (!window.postMessage) {
    return Gallery
  }

  $.extend(Gallery.prototype.options, {
    // The list object property (or data attribute) with the YouTube video id:
    youTubeVideoIdProperty: 'youtube',
    // Optional object with parameters passed to the YouTube video player:
    // https://developers.google.com/youtube/player_parameters
    youTubePlayerVars: {
      wmode: 'transparent'
    },
    // Require a click on the native YouTube player for the initial playback:
    youTubeClickToPlay: true
  })

  var textFactory = Gallery.prototype.textFactory ||
                      Gallery.prototype.imageFactory
  var YouTubePlayer = function (videoId, playerVars, clickToPlay) {
    this.videoId = videoId
    this.playerVars = playerVars
    this.clickToPlay = clickToPlay
    this.element = document.createElement('div')
    this.listeners = {}
  }

  $.extend(YouTubePlayer.prototype, {
    canPlayType: function () {
      return true
    },

    on: function (type, func) {
      this.listeners[type] = func
      return this
    },

    loadAPI: function () {
      var that = this
      var onYouTubeIframeAPIReady = window.onYouTubeIframeAPIReady
      var apiUrl = '//www.youtube.com/iframe_api'
      var scriptTags = document.getElementsByTagName('script')
      var i = scriptTags.length
      var scriptTag
      window.onYouTubeIframeAPIReady = function () {
        if (onYouTubeIframeAPIReady) {
          onYouTubeIframeAPIReady.apply(this)
        }
        if (that.playOnReady) {
          that.play()
        }
      }
      while (i) {
        i -= 1
        if (scriptTags[i].src === apiUrl) {
          return
        }
      }
      scriptTag = document.createElement('script')
      scriptTag.src = apiUrl
      scriptTags[0].parentNode.insertBefore(scriptTag, scriptTags[0])
    },

    onReady: function () {
      this.ready = true
      if (this.playOnReady) {
        this.play()
      }
    },

    onPlaying: function () {
      if (this.playStatus < 2) {
        this.listeners.playing()
        this.playStatus = 2
      }
    },

    onPause: function () {
      Gallery.prototype.setTimeout.call(
        this,
        this.checkSeek,
        null,
        2000
      )
    },

    checkSeek: function () {
      if (this.stateChange === YT.PlayerState.PAUSED ||
        this.stateChange === YT.PlayerState.ENDED) {
        // check if current state change is actually paused
        this.listeners.pause()
        delete this.playStatus
      }
    },

    onStateChange: function (event) {
      switch (event.data) {
        case YT.PlayerState.PLAYING:
          this.hasPlayed = true
          this.onPlaying()
          break
        case YT.PlayerState.PAUSED:
        case YT.PlayerState.ENDED:
          this.onPause()
          break
      }
      // Save most recent state change to this.stateChange
      this.stateChange = event.data
    },

    onError: function (event) {
      this.listeners.error(event)
    },

    play: function () {
      var that = this
      if (!this.playStatus) {
        this.listeners.play()
        this.playStatus = 1
      }
      if (this.ready) {
        if (!this.hasPlayed && (this.clickToPlay || (window.navigator &&
          /iP(hone|od|ad)/.test(window.navigator.platform)))) {
          // Manually trigger the playing callback if clickToPlay
          // is enabled and to workaround a limitation in iOS,
          // which requires synchronous user interaction to start
          // the video playback:
          this.onPlaying()
        } else {
          this.player.playVideo()
        }
      } else {
        this.playOnReady = true
        if (!(window.YT && YT.Player)) {
          this.loadAPI()
        } else if (!this.player) {
          this.player = new YT.Player(this.element, {
            videoId: this.videoId,
            playerVars: this.playerVars,
            events: {
              onReady: function () {
                that.onReady()
              },
              onStateChange: function (event) {
                that.onStateChange(event)
              },
              onError: function (event) {
                that.onError(event)
              }
            }
          })
        }
      }
    },

    pause: function () {
      if (this.ready) {
        this.player.pauseVideo()
      } else if (this.playStatus) {
        delete this.playOnReady
        this.listeners.pause()
        delete this.playStatus
      }
    }

  })

  $.extend(Gallery.prototype, {
    YouTubePlayer: YouTubePlayer,

    textFactory: function (obj, callback) {
      var options = this.options
      var videoId = this.getItemProperty(obj, options.youTubeVideoIdProperty)
      if (videoId) {
        if (this.getItemProperty(obj, options.urlProperty) === undefined) {
          obj[options.urlProperty] = '//www.youtube.com/watch?v=' + videoId
        }
        if (this.getItemProperty(obj, options.videoPosterProperty) === undefined) {
          obj[options.videoPosterProperty] = '//img.youtube.com/vi/' + videoId +
            '/maxresdefault.jpg'
        }
        return this.videoFactory(
          obj,
          callback,
          new YouTubePlayer(
            videoId,
            options.youTubePlayerVars,
            options.youTubeClickToPlay
          )
        )
      }
      return textFactory.call(this, obj, callback)
    }

  })

  return Gallery
}))