CaffGeek/MBACNationals

/*globals window, document, jQuery, _, Backbone, _wpmejsSettings */

(function ($, _, Backbone) {
    "use strict";

    var WPPlaylistView = Backbone.View.extend({
        initialize : function (options) {
            this.index = 0;
            this.settings = {};
            this.data = options.metadata || $.parseJSON( this.$('script').html() );
            this.playerNode = this.$( this.data.type );

            this.tracks = new Backbone.Collection( this.data.tracks );
            this.current = this.tracks.first();

            if ( 'audio' === this.data.type ) {
                this.currentTemplate = wp.template( 'wp-playlist-current-item' );
                this.currentNode = this.$( '.wp-playlist-current-item' );
            }

            this.renderCurrent();

            if ( this.data.tracklist ) {
                this.itemTemplate = wp.template( 'wp-playlist-item' );
                this.playingClass = 'wp-playlist-playing';
                this.renderTracks();
            }

            this.playerNode.attr( 'src', this.current.get( 'src' ) );

            _.bindAll( this, 'bindPlayer', 'bindResetPlayer', 'setPlayer', 'ended', 'clickTrack' );

            if ( ! _.isUndefined( window._wpmejsSettings ) ) {
                this.settings.pluginPath = _wpmejsSettings.pluginPath;
            }
            this.settings.success = this.bindPlayer;
            this.setPlayer();
        },

        bindPlayer : function (mejs) {
            this.player = mejs;
            this.player.addEventListener( 'ended', this.ended );
        },

        bindResetPlayer : function (mejs) {
            this.bindPlayer( mejs );
            this.playCurrentSrc();
        },

        setPlayer: function () {
            if ( this._player ) {
                this._player.pause();
                this._player.remove();
                this.playerNode = this.$( this.data.type );
                this.playerNode.attr( 'src', this.current.get( 'src' ) );
                this.settings.success = this.bindResetPlayer;
            }
            /**
             * This is also our bridge to the outside world
             */
            this._player = new MediaElementPlayer( this.playerNode.get(0), this.settings );
        },

        playCurrentSrc : function () {
            this.renderCurrent();
            this.player.setSrc( this.playerNode.attr( 'src' ) );
            this.player.load();
            this.player.play();
        },

        renderCurrent : function () {
            var dimensions;
            if ( 'video' === this.data.type ) {
                if ( this.data.images && this.current.get( 'image' ) ) {
                    this.playerNode.attr( 'poster', this.current.get( 'image' ).src );
                }
                dimensions = this.current.get( 'dimensions' ).resized;
                this.playerNode.attr( dimensions );
            } else {
                if ( ! this.data.images ) {
                    this.current.set( 'image', false );
                }
                this.currentNode.html( this.currentTemplate( this.current.toJSON() ) );
            }
        },

        renderTracks : function () {
            var self = this, i = 1, tracklist = $( '<div class="wp-playlist-tracks"></div>' );
            this.tracks.each(function (model) {
                if ( ! self.data.images ) {
                    model.set( 'image', false );
                }
                model.set( 'artists', self.data.artists );
                model.set( 'index', self.data.tracknumbers ? i : false );
                tracklist.append( self.itemTemplate( model.toJSON() ) );
                i += 1;
            });
            this.$el.append( tracklist );

            this.$( '.wp-playlist-item' ).eq(0).addClass( this.playingClass );
        },

        events : {
            'click .wp-playlist-item' : 'clickTrack',
            'click .wp-playlist-next' : 'next',
            'click .wp-playlist-prev' : 'prev'
        },

        clickTrack : function (e) {
            e.preventDefault();

            this.index = this.$( '.wp-playlist-item' ).index( e.currentTarget );
            this.setCurrent();
        },

        ended : function () {
            if ( this.index + 1 < this.tracks.length ) {
                this.next();
            } else {
                this.index = 0;
                this.current = this.tracks.at( this.index );
                this.loadCurrent();
            }
        },

        next : function () {
            this.index = this.index + 1 >= this.tracks.length ? 0 : this.index + 1;
            this.setCurrent();
        },

        prev : function () {
            this.index = this.index - 1 < 0 ? this.tracks.length - 1 : this.index - 1;
            this.setCurrent();
        },

        loadCurrent : function () {
            var last = this.playerNode.attr( 'src' ).split('.').pop(),
                current = this.current.get( 'src' ).split('.').pop();

            this.player.pause();

            if ( last !== current ) {
                this.setPlayer();
            } else {
                this.playerNode.attr( 'src', this.current.get( 'src' ) );
                this.playCurrentSrc();
            }
        },

        setCurrent : function () {
            this.current = this.tracks.at( this.index );

            if ( this.data.tracklist ) {
                this.$( '.wp-playlist-item' )
                    .removeClass( this.playingClass )
                    .eq( this.index )
                        .addClass( this.playingClass );
            }

            this.loadCurrent();
        }
    });

    $(document).ready(function () {
        if ( ! $( 'body' ).hasClass( 'wp-admin' ) || $( 'body' ).hasClass( 'about-php' ) ) {
            $('.wp-playlist').each(function () {
                return new WPPlaylistView({ el: this });
            });
        }
    });

    window.WPPlaylistView = WPPlaylistView;

}(jQuery, _, Backbone));