/*!

 * Popcorn.sequence

 *

 * Copyright 2011, Rick Waldron

 * Licensed under MIT license.

 *

 */

/* jslint forin: true, maxerr: 50, indent: 4, es5: true  */

/* global Popcorn: true */

// Requires Popcorn.js

(function( global, Popcorn ) {

  // TODO: as support increases, migrate to element.dataset

  var doc = global.document,

      location = global.location,

      rprotocol = /:\/\//,

      // TODO: better solution to this sucky stop-gap

      lochref = location.href.replace( location.href.split("/").slice(-1)[0], "" ),

      // privately held

      range = function(start, stop, step) {

        start = start || 0;

        stop = ( stop || start || 0 ) + 1;

        step = step || 1;

        var len = Math.ceil((stop - start) / step) || 0,

            idx = 0,

            range = [];

        range.length = len;

        while (idx < len) {

         range[idx++] = start;

         start += step;

        }

        return range;

      };

  Popcorn.sequence = function( parent, list ) {

    return new Popcorn.sequence.init( parent, list );

  };

  Popcorn.sequence.init = function( parent, list ) {

    // Video element

    this.parent = doc.getElementById( parent );

    // Store ref to a special ID

    this.seqId = Popcorn.guid( "__sequenced" );

    // List of HTMLVideoElements

    this.queue = [];

    // List of Popcorn objects

    this.playlist = [];

    // Lists of in/out points

    this.inOuts = {

      // Stores the video in/out times for each video in sequence

      ofVideos: [],

      // Stores the clip in/out times for each clip in sequences

      ofClips: []

    };

    // Store first video dimensions

    this.dims = {

      width: 0, //this.video.videoWidth,

      height: 0 //this.video.videoHeight

    };

    this.active = 0;

    this.cycling = false;

    this.playing = false;

    this.times = {

      last: 0

    };

    // Store event pointers and queues

    this.events = {

    };

    var self = this,

        clipOffset = 0;

    // Create `video` elements

    Popcorn.forEach( list, function( media, idx ) {

      var video = doc.createElement( "video" );

      video.preload = "auto";

      // Setup newly created video element

      video.controls = true;

      // If the first, show it, if the after, hide it

      video.style.display = ( idx && "none" ) || "" ;

      // Seta registered sequence id

      video.id = self.seqId + "-" + idx ;

      // Push this video into the sequence queue

      self.queue.push( video );

      var //satisfy lint

       mIn = media["in"],

       mOut = media["out"];

      // Push the in/out points into sequence ioVideos

      self.inOuts.ofVideos.push({

        "in": mIn !== undefined && typeof mIn === "number" ?  mIn : 1,

        "out": mOut !== undefined && typeof mOut === "number" ? mOut : 0

      });

      self.inOuts.ofVideos[ idx ]["out"] = self.inOuts.ofVideos[ idx ]["out"] || self.inOuts.ofVideos[ idx ]["in"] + 2;

      // Set the sources

      video.src = !rprotocol.test( media.src ) ? lochref + media.src : media.src;

      // Set some squence specific data vars

      video.setAttribute("data-sequence-owner", parent );

      video.setAttribute("data-sequence-guid", self.seqId );

      video.setAttribute("data-sequence-id", idx );

      video.setAttribute("data-sequence-clip", [ self.inOuts.ofVideos[ idx ]["in"], self.inOuts.ofVideos[ idx ]["out"] ].join(":") );

      // Append the video to the parent element

      self.parent.appendChild( video );

      self.playlist.push( Popcorn("#" + video.id ) );

    });

    self.inOuts.ofVideos.forEach(function( obj ) {

      var clipDuration = obj["out"] - obj["in"],

          offs = {

            "in": clipOffset,

            "out": clipOffset + clipDuration

          };

      self.inOuts.ofClips.push( offs );

      clipOffset = offs["out"];

    });

    Popcorn.forEach( this.queue, function( media, idx ) {

      function canPlayThrough( event ) {

        // If this is idx zero, use it as dimension for all

        if ( !idx ) {

          self.dims.width = media.videoWidth;

          self.dims.height = media.videoHeight;

        }

        // -0.2 prevents trackEvents from firing when they trigger on a clips in value

        media.currentTime = self.inOuts.ofVideos[ idx ]["in"] - 0.2;

        media.removeEventListener( "canplaythrough", canPlayThrough, false );

        return true;

      }

      // Hook up event oners for managing special playback

      media.addEventListener( "canplaythrough", canPlayThrough, false );

      // TODO: consolidate & DRY

      media.addEventListener( "play", function( event ) {

        self.playing = true;

      }, false );

      media.addEventListener( "pause", function( event ) {

        self.playing = false;

      }, false );

      media.addEventListener( "timeupdate", function( event ) {

        var target = event.srcElement || event.target,

            seqIdx = +(  (target.dataset && target.dataset.sequenceId) || target.getAttribute("data-sequence-id") ),

            floor = Math.floor( media.currentTime );

        if ( self.times.last !== floor &&

              seqIdx === self.active ) {

          self.times.last = floor;

          if ( floor === self.inOuts.ofVideos[ seqIdx ]["out"] ) {

            Popcorn.sequence.cycle.call( self, seqIdx );

          }

        }

      }, false );

      media.addEventListener( "ended", function( event ) {

        var target = event.srcElement || event.target,

            seqIdx = +(  (target.dataset && target.dataset.sequenceId) || target.getAttribute("data-sequence-id") );

        Popcorn.sequence.cycle.call( self, seqIdx );

      }, false );

    });

    return this;

  };

  Popcorn.sequence.init.prototype = Popcorn.sequence.prototype;

  Popcorn.sequence.cycle = function( fromIdx, toIdx ) {

    if ( !this.queue ) {

      Popcorn.error("Popcorn.sequence.cycle is not a public method");

    }

    // no cycle needed, bail

    if ( fromIdx === toIdx ) {

      return this;

    }

    // Localize references

    var queue = this.queue,

        ioVideos = this.inOuts.ofVideos,

        current = queue[ fromIdx ],

        nextIdx, next, clip;

    // Popcorn instances

    var $popnext,

        $popprev;

    nextIdx = typeof toIdx === "number" ? toIdx : fromIdx + 1;

    // Reset queue

    if ( !queue[ nextIdx ] ) {

      nextIdx = 0;

      this.playlist[ fromIdx ].pause();

    } else {

      next = queue[ nextIdx ];

      clip = ioVideos[ nextIdx ];

      // Constrain dimentions

      /*

      Popcorn.extend( next, {

        width: this.dims.width,

        height: this.dims.height

      });

      */

      $popnext = this.playlist[ nextIdx ];

      $popprev = this.playlist[ fromIdx ];

      current.pause();

      this.active = nextIdx;

      this.times.last = clip["in"] - 1;

      // Hide the currently ending video

      current.style.display = "none";

      // Show the next video in the sequence

      next.style.display = "";

      // Play the next video in the sequence

      $popnext.currentTime( clip["in"] );

      $popnext.play();

      // Trigger custom cycling event hook

      this.trigger( "cycle", {

        position: {

          previous: fromIdx,

          current: nextIdx

        }

      });

      this.cycling = false;

    }

    return this;

  };

  var excludes = [ "timeupdate", "play", "pause" ];

  // Sequence object prototype

  Popcorn.extend( Popcorn.sequence.prototype, {

    // Returns Popcorn object from sequence at index

    eq: function( idx ) {

      return this.playlist[ idx ];

    },

    // Remove a sequence from it's playback display container

    remove: function() {

      this.parent.innerHTML = null;

    },

    // Returns Clip object from sequence at index

    clip: function( idx ) {

      return this.inOuts.ofVideos[ idx ];

    },

    // Returns sum duration for all videos in sequence

    duration: function() {

      var ret = 0,

          seq = this.inOuts.ofClips,

          idx = 0;

      for ( ; idx < seq.length; idx++ ) {

        ret += seq[ idx ]["out"] - seq[ idx ]["in"];

      }

      return ret;

    },

    // Returns sum duration for n first videos in sequences

    durationSeqs: function(n) {

      var ret = 0,

          seq = this.inOuts.ofClips,

          idx = 0;

      for ( ; idx < n; idx++ ) {

        ret += seq[ idx ]["out"] - seq[ idx ]["in"];

      }

      return ret;

    },

    play: function() {

      /*

      var c = Math.round( this.queue[ this.active ].currentTime );

      if ( ( ( this.queue.length - 1 ) === this.active ) &&

           ( this.inOuts[ "ofVideos" ][ this.active ][ "out" ] >= Math.round( this.queue[ this.active ].currentTime ) ) )

      {

        this.jumpTo( 0 );

      } else */{

        this.queue[ this.active ].play();

      }

      return this;

    },

    // Pause the sequence

    pause: function() {

      this.queue[ this.active ].pause();