var $ = Backbone.$,

	Attachment;

/**

 * wp.media.model.Attachment

 *

 * @memberOf wp.media.model

 *

 * @class

 * @augments Backbone.Model

 */

Attachment = Backbone.Model.extend(/** @lends wp.media.model.Attachment.prototype */{

	/**

	 * Triggered when attachment details change

	 * Overrides Backbone.Model.sync

	 *

	 * @param {string} method

	 * @param {wp.media.model.Attachment} model

	 * @param {Object} [options={}]

	 *

	 * @return {Promise}

	 */

	sync: function( method, model, options ) {

		// If the attachment does not yet have an `id`, return an instantly

		// rejected promise. Otherwise, all of our requests will fail.

		if ( _.isUndefined( this.id ) ) {

			return $.Deferred().rejectWith( this ).promise();

		}

		// Overload the `read` request so Attachment.fetch() functions correctly.

		if ( 'read' === method ) {

			options = options || {};

			options.context = this;

			options.data = _.extend( options.data || {}, {

				action: 'get-attachment',

				id: this.id

			});

			return wp.media.ajax( options );

		// Overload the `update` request so properties can be saved.

		} else if ( 'update' === method ) {

			// If we do not have the necessary nonce, fail immediately.

			if ( ! this.get('nonces') || ! this.get('nonces').update ) {

				return $.Deferred().rejectWith( this ).promise();

			}

			options = options || {};

			options.context = this;

			// Set the action and ID.

			options.data = _.extend( options.data || {}, {

				action:  'save-attachment',

				id:      this.id,

				nonce:   this.get('nonces').update,

				post_id: wp.media.model.settings.post.id

			});

			// Record the values of the changed attributes.

			if ( model.hasChanged() ) {

				options.data.changes = {};

				_.each( model.changed, function( value, key ) {

					options.data.changes[ key ] = this.get( key );

				}, this );

			}

			return wp.media.ajax( options );

		// Overload the `delete` request so attachments can be removed.

		// This will permanently delete an attachment.

		} else if ( 'delete' === method ) {

			options = options || {};

			if ( ! options.wait ) {

				this.destroyed = true;

			}

			options.context = this;

			options.data = _.extend( options.data || {}, {

				action:   'delete-post',

				id:       this.id,

				_wpnonce: this.get('nonces')['delete']

			});

			return wp.media.ajax( options ).done( function() {

				this.destroyed = true;

			}).fail( function() {

				this.destroyed = false;

			});

		// Otherwise, fall back to `Backbone.sync()`.

		} else {

			/**

			 * Call `sync` directly on Backbone.Model

			 */

			return Backbone.Model.prototype.sync.apply( this, arguments );

		}

	},

	/**

	 * Convert date strings into Date objects.

	 *

	 * @param {Object} resp The raw response object, typically returned by fetch()

	 * @return {Object} The modified response object, which is the attributes hash

	 *                  to be set on the model.

	 */

	parse: function( resp ) {

		if ( ! resp ) {

			return resp;

		}

		resp.date = new Date( resp.date );

		resp.modified = new Date( resp.modified );

		return resp;

	},

	/**

	 * @param {Object} data The properties to be saved.

	 * @param {Object} options Sync options. e.g. patch, wait, success, error.

	 *

	 * @this Backbone.Model

	 *

	 * @return {Promise}

	 */

	saveCompat: function( data, options ) {

		var model = this;

		// If we do not have the necessary nonce, fail immediately.

		if ( ! this.get('nonces') || ! this.get('nonces').update ) {

			return $.Deferred().rejectWith( this ).promise();

		}

		return wp.media.post( 'save-attachment-compat', _.defaults({

			id:      this.id,

			nonce:   this.get('nonces').update,

			post_id: wp.media.model.settings.post.id

		}, data ) ).done( function( resp, status, xhr ) {

			model.set( model.parse( resp, xhr ), options );

		});

	}

},/** @lends wp.media.model.Attachment */{

	/**

	 * Create a new model on the static 'all' attachments collection and return it.

	 *

	 * @static

	 *

	 * @param {Object} attrs

	 * @return {wp.media.model.Attachment}

	 */

	create: function( attrs ) {

		var Attachments = wp.media.model.Attachments;

		return Attachments.all.push( attrs );

	},

	/**

	 * Create a new model on the static 'all' attachments collection and return it.

	 *

	 * If this function has already been called for the id,

	 * it returns the specified attachment.

	 *

	 * @static

	 * @param {string} id A string used to identify a model.

	 * @param {Backbone.Model|undefined} attachment

	 * @return {wp.media.model.Attachment}

	 */

	get: _.memoize( function( id, attachment ) {

		var Attachments = wp.media.model.Attachments;

		return Attachments.all.push( attachment || { id: id } );

	})

});

module.exports = Attachment;

/***/ }),

/**

 * wp.media.model.Attachments

 *

 * A collection of attachments.

 *

 * This collection has no persistence with the server without supplying

 * 'options.props.query = true', which will mirror the collection

 * to an Attachments Query collection - @see wp.media.model.Attachments.mirror().

 *

 * @memberOf wp.media.model

 *

 * @class

 * @augments Backbone.Collection

 *

 * @param {array}  [models]                Models to initialize with the collection.

 * @param {object} [options]               Options hash for the collection.

 * @param {string} [options.props]         Options hash for the initial query properties.

 * @param {string} [options.props.order]   Initial order (ASC or DESC) for the collection.

 * @param {string} [options.props.orderby] Initial attribute key to order the collection by.

 * @param {string} [options.props.query]   Whether the collection is linked to an attachments query.

 * @param {string} [options.observe]

 * @param {string} [options.filters]

 *

 */

var Attachments = Backbone.Collection.extend(/** @lends wp.media.model.Attachments.prototype */{

	/**

	 * @type {wp.media.model.Attachment}

	 */

	model: wp.media.model.Attachment,

	/**

	 * @param {Array} [models=[]] Array of models used to populate the collection.

	 * @param {Object} [options={}]

	 */

	initialize: function( models, options ) {

		options = options || {};

		this.props   = new Backbone.Model();

		this.filters = options.filters || {};

		// Bind default `change` events to the `props` model.

		this.props.on( 'change', this._changeFilteredProps, this );

		this.props.on( 'change:order',   this._changeOrder,   this );

		this.props.on( 'change:orderby', this._changeOrderby, this );

		this.props.on( 'change:query',   this._changeQuery,   this );

		this.props.set( _.defaults( options.props || {} ) );

		if ( options.observe ) {

			this.observe( options.observe );

		}

	},

	/**

	 * Sort the collection when the order attribute changes.

	 *

	 * @access private

	 */

	_changeOrder: function() {

		if ( this.comparator ) {

			this.sort();

		}

	},

	/**

	 * Set the default comparator only when the `orderby` property is set.

	 *

	 * @access private

	 *

	 * @param {Backbone.Model} model

	 * @param {string} orderby

	 */

	_changeOrderby: function( model, orderby ) {

		// If a different comparator is defined, bail.

		if ( this.comparator && this.comparator !== Attachments.comparator ) {

			return;

		}

		if ( orderby && 'post__in' !== orderby ) {

			this.comparator = Attachments.comparator;

		} else {

			delete this.comparator;

		}

	},

	/**

	 * If the `query` property is set to true, query the server using

	 * the `props` values, and sync the results to this collection.

	 *

	 * @access private

	 *

	 * @param {Backbone.Model} model

	 * @param {boolean} query

	 */

	_changeQuery: function( model, query ) {

		if ( query ) {

			this.props.on( 'change', this._requery, this );

			this._requery();

		} else {

			this.props.off( 'change', this._requery, this );

		}

	},

	/**

	 * @access private

	 *

	 * @param {Backbone.Model} model

	 */

	_changeFilteredProps: function( model ) {

		// If this is a query, updating the collection will be handled by

		// `this._requery()`.

		if ( this.props.get('query') ) {

			return;

		}

		var changed = _.chain( model.changed ).map( function( t, prop ) {

			var filter = Attachments.filters[ prop ],

				term = model.get( prop );

			if ( ! filter ) {

				return;

			}

			if ( term && ! this.filters[ prop ] ) {

				this.filters[ prop ] = filter;

			} else if ( ! term && this.filters[ prop ] === filter ) {

				delete this.filters[ prop ];

			} else {

				return;

			}

			// Record the change.

			return true;

		}, this ).any().value();

		if ( ! changed ) {

			return;

		}

		// If no `Attachments` model is provided to source the searches from,

		// then automatically generate a source from the existing models.

		if ( ! this._source ) {

			this._source = new Attachments( this.models );

		}

		this.reset( this._source.filter( this.validator, this ) );

	},

	validateDestroyed: false,

	/**

	 * Checks whether an attachment is valid.

	 *

	 * @param {wp.media.model.Attachment} attachment

	 * @return {boolean}

	 */

	validator: function( attachment ) {

		if ( ! this.validateDestroyed && attachment.destroyed ) {

			return false;

		}

		return _.all( this.filters, function( filter ) {

			return !! filter.call( this, attachment );

		}, this );

	},

	/**

	 * Add or remove an attachment to the collection depending on its validity.

	 *

	 * @param {wp.media.model.Attachment} attachment

	 * @param {Object} options

	 * @return {wp.media.model.Attachments} Returns itself to allow chaining.

	 */

	validate: function( attachment, options ) {

		var valid = this.validator( attachment ),

			hasAttachment = !! this.get( attachment.cid );

		if ( ! valid && hasAttachment ) {

			this.remove( attachment, options );

		} else if ( valid && ! hasAttachment ) {

			this.add( attachment, options );

		}

		return this;

	},

	/**