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

// Back-compat

window.autosave = function() {

	return true;

};

( function( $, window ) {

	function autosave() {

		var initialCompareString,

		lastTriggerSave = 0,

		$document = $(document);

		/**

		 * Returns the data saved in both local and remote autosave

		 *

		 * @return object Object containing the post data

		 */

		function getPostData( type ) {

			var post_name, parent_id, data,

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

				cats = [],

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

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

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

			if ( editor && ! 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;

		// Concatenate title, content and excerpt. Used to track changes when auto-saving.

		function getCompareString( postData ) {

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

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

			}

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

		}

		function disableButtons() {

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

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

			setTimeout( enableButtons, 5000 );

		}

		function enableButtons() {

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

		// Autosave in localStorage

		function autosaveLocal() {

			var restorePostData, undoPostData, blog_id, post_id, hasStorage, intervalTimer,

				lastCompareString,

				isSuspended = false;

			// Check if the browser supports sessionStorage and it's not disabled

			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;

			}

			/**

			 * Initialize the local storage

			 *

			 * @return mixed 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;

			}

			/**

			 * Set the storage for this blog

			 *

			 * Confirms that the data was saved successfully.

			 *

			 * @return bool

			 */

			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;

			}

			/**

			 * Get the saved post data for the current post

			 *

			 * @return mixed 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;

			/**

			 * Set (save or delete) post data in the storage.

			 *

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

			 *

			 * $param stored_data The post data to store or null/false/empty to delete the key

			 * @return bool

			 */

			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 );

			}

			function suspend() {

				isSuspended = true;

			function resume() {

				isSuspended = false;

			}

			/**

			 * Save post data for the current post

			 *

			 * 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.

			 *

			 * $param data optional Object The post data for saving, minimum 'post_title' and 'content'

			 * @return bool

			 */

			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;

			}

			// Run on DOM ready

			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.

					// This prevents false positives.

					$document.on( 'tinymce-editor-init.autosave', function() {

						window.setTimeout( function() {

							checkPost();

						}, 1500 );

					});

				} else {

					checkPost();

				}

				// Save every 15 sec.

				intervalTimer = window.setInterval( save, 15000 );

				$( 'form#post' ).on( 'submit.autosave-local', function() {

					var editor = typeof tinymce !== 'undefined' && tinymce.get('content'),

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

					if ( editor && ! editor.isHidden() ) {

						// Last onSubmit event in the editor, needs to run after the content has been moved to the textarea.

						editor.on( 'submit', function() {

							save({

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

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

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

							});

						});

					} else {

						save({

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

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

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

					wpCookies.set( 'wp-saving-post', post_id + '-check', 24 * 60 * 60 );

			// Strip whitespace and compare two strings

			function compare( str1, str2 ) {

				function removeSpaces( string ) {

					return string.toString().replace(/[\x20\t\r\n\f]+/g, '');

				}

				return ( removeSpaces( str1 || '' ) === removeSpaces( str2 || '' ) );

			}

			/**

			 * Check if the saved data for the current post (if any) is different than the loaded post data on the screen

			 *

			 * Shows a standard message letting the user restore the post data if different.

			 *

			 * @return void

			 */

			function checkPost() {

				var content, post_title, excerpt, $notice,

					postData = getSavedPostData(),

					cookie = wpCookies.get( 'wp-saving-post' );

				if ( cookie === post_id + '-saved' ) {

					wpCookies.remove( 'wp-saving-post' );

					// The post was saved properly, remove old data and bail

					setData( false );

					return;

				}

				if ( ! postData ) {

					return;

				}

				// There is a newer autosave. Don't show two "restore" notices at the same time.

				if ( $( '#has-newer-autosave' ).length ) {

					return;

				}

				content = $( '#content' ).val() || '';

				post_title = $( '#title' ).val() || '';

				excerpt = $( '#excerpt' ).val() || '';

				if ( compare( content, postData.content ) && compare( post_title, postData.post_title ) &&

					compare( excerpt, postData.excerpt ) ) {

					return;

				}

				restorePostData = postData;

				undoPostData = {

					content: content,

					post_title: post_title,

					excerpt: excerpt

				};

				$notice = $( '#local-storage-notice' );

				$('.wrap h2').first().after( $notice.addClass( 'notice-warning' ).show() );

				$notice.on( 'click.autosave-local', function( event ) {

					var $target = $( event.target );