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/* global _wpmejsSettings, MediaElementPlayer */
(function ($, _, Backbone) {
'use strict';
/** @namespace wp */
window.wp = window.wp || {};
var WPPlaylistView = Backbone.View.extend(/** @lends WPPlaylistView.prototype */{
/**
* @constructs
*
* @param {Object} options The options to create this playlist view with.
* @param {Object} options.metadata The metadata
*/
initialize : function (options) {
this.index = 0;
this.settings = {};
this.data = options.metadata || $.parseJSON( this.$('script.wp-playlist-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 = _.clone( _wpmejsSettings );
}
this.settings.success = this.bindPlayer;
this.setPlayer();
},
bindPlayer : function (mejs) {
this.mejs = mejs;
this.mejs.addEventListener( 'ended', this.ended );
},
bindResetPlayer : function (mejs) {
this.bindPlayer( mejs );
this.playCurrentSrc();
},
setPlayer: function (force) {
if ( this.player ) {
this.player.pause();
this.player.remove();
this.playerNode = this.$( this.data.type );
}
if (force) {
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.mejs.setSrc( this.playerNode.attr( 'src' ) );
this.mejs.load();
this.mejs.play();
},
renderCurrent : function () {
var dimensions, defaultImage = 'wp-includes/images/media/video.svg';
if ( 'video' === this.data.type ) {
if ( this.data.images && this.current.get( 'image' ) && -1 === this.current.get( 'image' ).src.indexOf( defaultImage ) ) {
this.playerNode.attr( 'poster', this.current.get( 'image' ).src );
}
dimensions = this.current.get( 'dimensions' );
if ( dimensions && dimensions.resized ) {
this.playerNode.attr( dimensions.resized );
}
} 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.setCurrent();
}
},
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' ) && this.playerNode.attr( 'src' ).split('.').pop(),
current = this.current.get( 'src' ).split('.').pop();
this.mejs && this.mejs.pause();
if ( last !== current ) {
this.setPlayer( true );
} 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();
}
});
/**
* Initialize media playlists in the document.
*
* Only initializes new playlists not previously-initialized.
*
* @since 4.9.3
* @return {void}
*/
function initialize() {
$( '.wp-playlist:not(:has(.mejs-container))' ).each( function() {
new WPPlaylistView( { el: this } );
} );
}
/**
* Expose the API publicly on window.wp.playlist.
*
* @namespace wp.playlist
* @since 4.9.3
* @type {object}
*/
window.wp.playlist = {
initialize: initialize
};
$( document ).ready( initialize );
window.WPPlaylistView = WPPlaylistView;
}(jQuery, _, Backbone));