/* global tinymce, wpCookies, autosaveL10n, switchEditors */

// Back-compat

window.autosave = function() {

	return true;

};

/**

 *

 * @since 3.9.0

 *

 * @param {jQuery} $ jQuery object.

 * @param {window} The window object.

 *

 */

( function( $, window ) {

	/**

	 *

	 * @since 3.9.0

	 *

	 * @returns {Object}

	 * 	{{

	 * 		getPostData: getPostData,

	 * 		getCompareString: getCompareString,

	 * 		disableButtons: disableButtons,

	 * 		enableButtons: enableButtons,

	 * 		local: ({hasStorage, getSavedPostData, save, suspend, resume}|*),

	 * 		server: ({tempBlockSave, triggerSave, postChanged, suspend, resume}|*)}

	 * 	}

	 * 	The object with all functions for autosave.

	 */

	function autosave() {

		var initialCompareString,

			lastTriggerSave = 0,

			$document = $(document);

		/**

		 *

		 * @since 3.9.0

		 *

		 * @param {string} type The type of autosave either local or remote.

		 *

		 * @returns {Object} Object containing the post data.

		 */

		function getPostData( type ) {

			var post_name, parent_id, data,

				time = ( new Date() ).getTime(),

				cats = [],

				editor = getEditor();

			// Don't run editor.save() more often than every 3 seconds.

			// It is resource intensive and might slow down typing in long posts on slow devices.

			if ( editor && editor.isDirty() && ! editor.isHidden() && time - 3000 > lastTriggerSave ) {

				editor.save();

				lastTriggerSave = time;

			}

			data = {

				post_id: $( '#post_ID' ).val() || 0,

				post_type: $( '#post_type' ).val() || '',

				post_author: $( '#post_author' ).val() || '',

				post_title: $( '#title' ).val() || '',

				content: $( '#content' ).val() || '',

				excerpt: $( '#excerpt' ).val() || ''

			};

			if ( type === 'local' ) {

				return data;

			}

			$( 'input[id^="in-category-"]:checked' ).each( function() {

				cats.push( this.value );

			});

			data.catslist = cats.join(',');

			if ( post_name = $( '#post_name' ).val() ) {

				data.post_name = post_name;

			}

			if ( parent_id = $( '#parent_id' ).val() ) {

				data.parent_id = parent_id;

			}

			if ( $( '#comment_status' ).prop( 'checked' ) ) {

				data.comment_status = 'open';

			}

			if ( $( '#ping_status' ).prop( 'checked' ) ) {

				data.ping_status = 'open';

			}

			if ( $( '#auto_draft' ).val() === '1' ) {

				data.auto_draft = '1';

			}

			return data;

		}

		/**

		 *

		 * @since 3.9.0

		 *

		 * @param {Object} postData The object containing the post data.

		 *

		 * @returns {string} A concatenated string with title, content and excerpt.

		 */

		function getCompareString( postData ) {

			if ( typeof postData === 'object' ) {

				return ( postData.post_title || '' ) + '::' + ( postData.content || '' ) + '::' + ( postData.excerpt || '' );

			}

			return ( $('#title').val() || '' ) + '::' + ( $('#content').val() || '' ) + '::' + ( $('#excerpt').val() || '' );

		}

		/**

		 *

		 * @since 3.9.0

		 *

		 * @returns {void}

		 */

		function disableButtons() {

			$document.trigger('autosave-disable-buttons');

			// Re-enable 5 sec later. Just gives autosave a head start to avoid collisions.

			setTimeout( enableButtons, 5000 );

		}

		/**

		 *

		 * @since 3.9.0

		 *

		 * @returns {void}

		 */

		function enableButtons() {

			$document.trigger( 'autosave-enable-buttons' );

		}

		/**

		 *

		 * @since 4.6.0

		 *

		 * @returns {boolean|*} Returns either false if the editor is undefined,

		 * 						or the instance of the content editor.

		 */

		function getEditor() {

			return typeof tinymce !== 'undefined' && tinymce.get('content');

		}

		/**

		 *

		 * @since 3.9.0

		 *

		 * @returns {

		 * {

		 * 	hasStorage: *,

		 * 	getSavedPostData: getSavedPostData,

		 * 	save: save,

		 * 	suspend: suspend,

		 * 	resume: resume

		 * 	}

		 * }

		 * The object with all functions for local storage autosave.

		 */

		function autosaveLocal() {

			var blog_id, post_id, hasStorage, intervalTimer,

				lastCompareString,

				isSuspended = false;

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {boolean} True if the sessionStorage is supported and enabled.

			 */

			function checkStorage() {

				var test = Math.random().toString(),

					result = false;

				try {

					window.sessionStorage.setItem( 'wp-test', test );

					result = window.sessionStorage.getItem( 'wp-test' ) === test;

					window.sessionStorage.removeItem( 'wp-test' );

				} catch(e) {}

				hasStorage = result;

				return result;

			}

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {boolean|Object} False if no sessionStorage in the browser or an Object

			 *                           containing all postData for this blog.

			 */

			function getStorage() {

				var stored_obj = false;

				// Separate local storage containers for each blog_id

				if ( hasStorage && blog_id ) {

					stored_obj = sessionStorage.getItem( 'wp-autosave-' + blog_id );

					if ( stored_obj ) {

						stored_obj = JSON.parse( stored_obj );

					} else {

						stored_obj = {};

					}

				}

				return stored_obj;

			}

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {boolean} True if the data was saved successfully, false if it wasn't saved.

			 */

			function setStorage( stored_obj ) {

				var key;

				if ( hasStorage && blog_id ) {

					key = 'wp-autosave-' + blog_id;

					sessionStorage.setItem( key, JSON.stringify( stored_obj ) );

					return sessionStorage.getItem( key ) !== null;

				}

				return false;

			}

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {boolean|Object} False if no storage or no data or the postData as an Object.

			 */

			function getSavedPostData() {

				var stored = getStorage();

				if ( ! stored || ! post_id ) {

					return false;

				}

				return stored[ 'post_' + post_id ] || false;

			}

			/**

			 *

			 * If stored_data evaluates to 'false' the storage key for the current post will be removed.

			 *

			 * @since 3.9.0

			 *

			 * @param {Object|boolean|null} stored_data The post data to store or null/false/empty to delete the key.

			 *

			 * @returns {boolean} True if data is stored, false if data was removed.

			 */

			function setData( stored_data ) {

				var stored = getStorage();

				if ( ! stored || ! post_id ) {

					return false;

				}

				if ( stored_data ) {

					stored[ 'post_' + post_id ] = stored_data;

				} else if ( stored.hasOwnProperty( 'post_' + post_id ) ) {

					delete stored[ 'post_' + post_id ];

				} else {

					return false;

				}

				return setStorage( stored );

			}

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {void}

			 */

			function suspend() {

				isSuspended = true;

			}

			/**

			 *

			 * @since 3.9.0

			 *

			 * @returns {void}

			 */

			function resume() {

				isSuspended = false;

			}

			/**

			 *

			 * Runs on a 15 sec. interval, saves when there are differences in the post title or content.

			 * When the optional data is provided, updates the last saved post data.

			 *

			 * @since 3.9.0

			 *

			 * @param {Object} data The post data for saving, minimum 'post_title' and 'content'.

			 *

			 * @returns {boolean} Returns true when data has been saved, otherwise it returns false.

			 */

			function save( data ) {

				var postData, compareString,

					result = false;

				if ( isSuspended || ! hasStorage ) {

					return false;

				}

				if ( data ) {

					postData = getSavedPostData() || {};

					$.extend( postData, data );

				} else {

					postData = getPostData('local');

				}

				compareString = getCompareString( postData );

				if ( typeof lastCompareString === 'undefined' ) {

					lastCompareString = initialCompareString;

				}

				// If the content, title and excerpt did not change since the last save, don't save again.

				if ( compareString === lastCompareString ) {

					return false;

				}

				postData.save_time = ( new Date() ).getTime();

				postData.status = $( '#post_status' ).val() || '';

				result = setData( postData );

				if ( result ) {

					lastCompareString = compareString;

				}

				return result;

			}

			/**

			 *

			 * Checks whether the editor is active or not to use the editor events

			 * to autosave, or uses the values from the elements to autosave.

			 *

			 * Runs on DOM ready.

			 *

			 * @since 3.9.0

			 *

			 * @returns {void}

			 */

			function run() {

				post_id = $('#post_ID').val() || 0;

				// Check if the local post data is different than the loaded post data.

				if ( $( '#wp-content-wrap' ).hasClass( 'tmce-active' ) ) {

					// If TinyMCE loads first, check the post 1.5 sec. after it is ready.

					// By this time the content has been loaded in the editor and 'saved' to the textarea.