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+/**
+ * editor_plugin_src.js
+ *
+ * Copyright 2009, Moxiecode Systems AB
+ * Released under LGPL License.
+ *
+ * License: http://tinymce.moxiecode.com/license
+ * Contributing: http://tinymce.moxiecode.com/contributing
+ *
+ * Adds auto-save capability to the TinyMCE text editor to rescue content
+ * inadvertently lost. This plugin was originally developed by Speednet
+ * and that project can be found here: http://code.google.com/p/tinyautosave/
+ *
+ * TECHNOLOGY DISCUSSION:
+ * 
+ * The plugin attempts to use the most advanced features available in the current browser to save
+ * as much content as possible.  There are a total of four different methods used to autosave the
+ * content.  In order of preference, they are:
+ * 
+ * 1. localStorage - A new feature of HTML 5, localStorage can store megabytes of data per domain
+ * on the client computer. Data stored in the localStorage area has no expiration date, so we must
+ * manage expiring the data ourselves.  localStorage is fully supported by IE8, and it is supposed
+ * to be working in Firefox 3 and Safari 3.2, but in reality is is flaky in those browsers.  As
+ * HTML 5 gets wider support, the AutoSave plugin will use it automatically. In Windows Vista/7,
+ * localStorage is stored in the following folder:
+ * C:\Users\[username]\AppData\Local\Microsoft\Internet Explorer\DOMStore\[tempFolder]
+ * 
+ * 2. sessionStorage - A new feature of HTML 5, sessionStorage works similarly to localStorage,
+ * except it is designed to expire after a certain amount of time.  Because the specification
+ * around expiration date/time is very loosely-described, it is preferrable to use locaStorage and
+ * manage the expiration ourselves.  sessionStorage has similar storage characteristics to
+ * localStorage, although it seems to have better support by Firefox 3 at the moment.  (That will
+ * certainly change as Firefox continues getting better at HTML 5 adoption.)
+ * 
+ * 3. UserData - A very under-exploited feature of Microsoft Internet Explorer, UserData is a
+ * way to store up to 128K of data per "document", or up to 1MB of data per domain, on the client
+ * computer.  The feature is available for IE 5+, which makes it available for every version of IE
+ * supported by TinyMCE.  The content is persistent across browser restarts and expires on the
+ * date/time specified, just like a cookie.  However, the data is not cleared when the user clears
+ * cookies on the browser, which makes it well-suited for rescuing autosaved content.  UserData,
+ * like other Microsoft IE browser technologies, is implemented as a behavior attached to a
+ * specific DOM object, so in this case we attach the behavior to the same DOM element that the
+ * TinyMCE editor instance is attached to.
+ */
+
+(function(tinymce) {
+	// Setup constants to help the compressor to reduce script size
+	var PLUGIN_NAME = 'autosave',
+		RESTORE_DRAFT = 'restoredraft',
+		TRUE = true,
+		undefined,
+		unloadHandlerAdded,
+		Dispatcher = tinymce.util.Dispatcher;
+
+	/**
+	 * This plugin adds auto-save capability to the TinyMCE text editor to rescue content
+	 * inadvertently lost. By using localStorage.
+	 *
+	 * @class tinymce.plugins.AutoSave
+	 */
+	tinymce.create('tinymce.plugins.AutoSave', {
+		/**
+		 * Initializes the plugin, this will be executed after the plugin has been created.
+		 * This call is done before the editor instance has finished it's initialization so use the onInit event
+		 * of the editor instance to intercept that event.
+		 *
+		 * @method init
+		 * @param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
+		 * @param {string} url Absolute URL to where the plugin is located.
+		 */
+		init : function(ed, url) {
+			var self = this, settings = ed.settings;
+
+			self.editor = ed;
+
+			// Parses the specified time string into a milisecond number 10m, 10s etc.
+			function parseTime(time) {
+				var multipels = {
+					s : 1000,
+					m : 60000
+				};
+
+				time = /^(\d+)([ms]?)$/.exec('' + time);
+
+				return (time[2] ? multipels[time[2]] : 1) * parseInt(time);
+			};
+
+			// Default config
+			tinymce.each({
+				ask_before_unload : TRUE,
+				interval : '30s',
+				retention : '20m',
+				minlength : 50
+			}, function(value, key) {
+				key = PLUGIN_NAME + '_' + key;
+
+				if (settings[key] === undefined)
+					settings[key] = value;
+			});
+
+			// Parse times
+			settings.autosave_interval = parseTime(settings.autosave_interval);
+			settings.autosave_retention = parseTime(settings.autosave_retention);
+
+			// Register restore button
+			ed.addButton(RESTORE_DRAFT, {
+				title : PLUGIN_NAME + ".restore_content",
+				onclick : function() {
+					if (ed.getContent().replace(/\s|&nbsp;|<\/?p[^>]*>|<br[^>]*>/gi, "").length > 0) {
+						// Show confirm dialog if the editor isn't empty
+						ed.windowManager.confirm(
+							PLUGIN_NAME + ".warning_message",
+							function(ok) {
+								if (ok)
+									self.restoreDraft();
+							}
+						);
+					} else
+						self.restoreDraft();
+				}
+			});
+
+			// Enable/disable restoredraft button depending on if there is a draft stored or not
+			ed.onNodeChange.add(function() {
+				var controlManager = ed.controlManager;
+
+				if (controlManager.get(RESTORE_DRAFT))
+					controlManager.setDisabled(RESTORE_DRAFT, !self.hasDraft());
+			});
+
+			ed.onInit.add(function() {
+				// Check if the user added the restore button, then setup auto storage logic
+				if (ed.controlManager.get(RESTORE_DRAFT)) {
+					// Setup storage engine
+					self.setupStorage(ed);
+
+					// Auto save contents each interval time
+					setInterval(function() {
+						self.storeDraft();
+						ed.nodeChanged();
+					}, settings.autosave_interval);
+				}
+			});
+
+			/**
+			 * This event gets fired when a draft is stored to local storage.
+			 *
+			 * @event onStoreDraft
+			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
+			 * @param {Object} draft Draft object containing the HTML contents of the editor.
+			 */
+			self.onStoreDraft = new Dispatcher(self);
+
+			/**
+			 * This event gets fired when a draft is restored from local storage.
+			 *
+			 * @event onStoreDraft
+			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
+			 * @param {Object} draft Draft object containing the HTML contents of the editor.
+			 */
+			self.onRestoreDraft = new Dispatcher(self);
+
+			/**
+			 * This event gets fired when a draft removed/expired.
+			 *
+			 * @event onRemoveDraft
+			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
+			 * @param {Object} draft Draft object containing the HTML contents of the editor.
+			 */
+			self.onRemoveDraft = new Dispatcher(self);
+
+			// Add ask before unload dialog only add one unload handler
+			if (!unloadHandlerAdded) {
+				window.onbeforeunload = tinymce.plugins.AutoSave._beforeUnloadHandler;
+				unloadHandlerAdded = TRUE;
+			}
+		},
+
+		/**
+		 * Returns information about the plugin as a name/value array.
+		 * The current keys are longname, author, authorurl, infourl and version.
+		 *
+		 * @method getInfo
+		 * @return {Object} Name/value array containing information about the plugin.
+		 */
+		getInfo : function() {
+			return {
+				longname : 'Auto save',
+				author : 'Moxiecode Systems AB',
+				authorurl : 'http://tinymce.moxiecode.com',
+				infourl : 'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/autosave',
+				version : tinymce.majorVersion + "." + tinymce.minorVersion
+			};
+		},
+
+		/**
+		 * Returns an expiration date UTC string.
+		 *
+		 * @method getExpDate
+		 * @return {String} Expiration date UTC string.
+		 */
+		getExpDate : function() {
+			return new Date(
+				new Date().getTime() + this.editor.settings.autosave_retention
+			).toUTCString();
+		},
+
+		/**
+		 * This method will setup the storage engine. If the browser has support for it.
+		 *
+		 * @method setupStorage
+		 */
+		setupStorage : function(ed) {
+			var self = this, testKey = PLUGIN_NAME + '_test', testVal = "OK";
+
+			self.key = PLUGIN_NAME + ed.id;
+
+			// Loop though each storage engine type until we find one that works
+			tinymce.each([
+				function() {
+					// Try HTML5 Local Storage
+					if (localStorage) {
+						localStorage.setItem(testKey, testVal);
+
+						if (localStorage.getItem(testKey) === testVal) {
+							localStorage.removeItem(testKey);
+
+							return localStorage;
+						}
+					}
+				},
+
+				function() {
+					// Try HTML5 Session Storage
+					if (sessionStorage) {
+						sessionStorage.setItem(testKey, testVal);
+
+						if (sessionStorage.getItem(testKey) === testVal) {
+							sessionStorage.removeItem(testKey);
+
+							return sessionStorage;
+						}
+					}
+				},
+
+				function() {
+					// Try IE userData
+					if (tinymce.isIE) {
+						ed.getElement().style.behavior = "url('#default#userData')";
+
+						// Fake localStorage on old IE
+						return {
+							autoExpires : TRUE,
+
+							setItem : function(key, value) {
+								var userDataElement = ed.getElement();
+
+								userDataElement.setAttribute(key, value);
+								userDataElement.expires = self.getExpDate();
+								userDataElement.save("TinyMCE");
+							},
+
+							getItem : function(key) {
+								var userDataElement = ed.getElement();
+
+								userDataElement.load("TinyMCE");
+
+								return userDataElement.getAttribute(key);
+							},
+
+							removeItem : function(key) {
+								ed.getElement().removeAttribute(key);
+							}
+						};
+					}
+				},
+			], function(setup) {
+				// Try executing each function to find a suitable storage engine
+				try {
+					self.storage = setup();
+
+					if (self.storage)
+						return false;
+				} catch (e) {
+					// Ignore
+				}
+			});
+		},
+
+		/**
+		 * This method will store the current contents in the the storage engine.
+		 *
+		 * @method storeDraft
+		 */
+		storeDraft : function() {
+			var self = this, storage = self.storage, editor = self.editor, expires, content;
+
+			// Is the contents dirty
+			if (storage) {
+				// If there is no existing key and the contents hasn't been changed since
+				// it's original value then there is no point in saving a draft
+				if (!storage.getItem(self.key) && !editor.isDirty())
+					return;
+
+				// Store contents if the contents if longer than the minlength of characters
+				content = editor.getContent();
+				if (content.length > editor.settings.autosave_minlength) {
+					expires = self.getExpDate();
+
+					// Store expiration date if needed IE userData has auto expire built in
+					if (!self.storage.autoExpires)
+						self.storage.setItem(self.key + "_expires", expires);
+
+					self.storage.setItem(self.key, content);
+					self.onStoreDraft.dispatch(self, {
+						expires : expires,
+						content : content
+					});
+				}
+			}
+		},
+
+		/**
+		 * This method will restore the contents from the storage engine back to the editor.
+		 *
+		 * @method restoreDraft
+		 */
+		restoreDraft : function() {
+			var self = this, storage = self.storage;
+
+			if (storage) {
+				content = storage.getItem(self.key);
+
+				if (content) {
+					self.editor.setContent(content);
+					self.onRestoreDraft.dispatch(self, {
+						content : content
+					});
+				}
+			}
+		},
+
+		/**
+		 * This method will return true/false if there is a local storage draft available.
+		 *
+		 * @method hasDraft
+		 * @return {boolean} true/false state if there is a local draft.
+		 */
+		hasDraft : function() {
+			var self = this, storage = self.storage, expDate, exists;
+
+			if (storage) {
+				// Does the item exist at all
+				exists = !!storage.getItem(self.key);
+				if (exists) {
+					// Storage needs autoexpire
+					if (!self.storage.autoExpires) {
+						expDate = new Date(storage.getItem(self.key + "_expires"));
+
+						// Contents hasn't expired
+						if (new Date().getTime() < expDate.getTime())
+							return TRUE;
+
+						// Remove it if it has
+						self.removeDraft();
+					} else
+						return TRUE;
+				}
+			}
+
+			return false;
+		},
+
+		/**
+		 * Removes the currently stored draft.
+		 *
+		 * @method removeDraft
+		 */
+		removeDraft : function() {
+			var self = this, storage = self.storage, key = self.key, content;
+
+			if (storage) {
+				// Get current contents and remove the existing draft
+				content = storage.getItem(key);
+				storage.removeItem(key);
+				storage.removeItem(key + "_expires");
+
+				// Dispatch remove event if we had any contents
+				if (content) {
+					self.onRemoveDraft.dispatch(self, {
+						content : content
+					});
+				}
+			}
+		},
+
+		"static" : {
+			// Internal unload handler will be called before the page is unloaded
+			_beforeUnloadHandler : function(e) {
+				var msg;
+
+				tinymce.each(tinyMCE.editors, function(ed) {
+					// Store a draft for each editor instance
+					if (ed.plugins.autosave)
+						ed.plugins.autosave.storeDraft();
+
+					// Never ask in fullscreen mode
+					if (ed.getParam("fullscreen_is_enabled"))
+						return;
+
+					// Setup a return message if the editor is dirty
+					if (!msg && ed.isDirty() && ed.getParam("autosave_ask_before_unload"))
+						msg = ed.getLang("autosave.unload_msg");
+				});
+
+				return msg;
+			}
+		}
+	});
+
+	tinymce.PluginManager.add('autosave', tinymce.plugins.AutoSave);
+})(tinymce);