/**
 * @class Ext.core.Element
 */

Ext.core.Element.addMethods({

    /**
     * Monitors this Element for the mouse leaving. Calls the function after the specified delay only if
     * the mouse was not moved back into the Element within the delay. If the mouse <i>was</i> moved
     * back in, the function is not called.
     * @param {Number} delay The delay <b>in milliseconds</b> to wait for possible mouse re-entry before calling the handler function.
     * @param {Function} handler The function to call if the mouse remains outside of this Element for the specified time.
     * @param {Object} scope The scope (<code>this</code> reference) in which the handler function executes. Defaults to this Element.
     * @return {Object} The listeners object which was added to this element so that monitoring can be stopped. Example usage:</pre><code>
// Hide the menu if the mouse moves out for 250ms or more
this.mouseLeaveMonitor = this.menuEl.monitorMouseLeave(250, this.hideMenu, this);

...
// Remove mouseleave monitor on menu destroy
this.menuEl.un(this.mouseLeaveMonitor);
</code></pre>
     */
    monitorMouseLeave: function(delay, handler, scope) {
        var me = this,
            timer,
            listeners = {
                mouseleave: function(e) {
                    timer = setTimeout(Ext.Function.bind(handler, scope||me, [e]), delay);
                },
                mouseenter: function() {
                    clearTimeout(timer);
                },
                freezeEvent: true
            };

        me.on(listeners);
        return listeners;
    },

    /**
     * Stops the specified event(s) from bubbling and optionally prevents the default action
     * @param {String/Array} eventName an event / array of events to stop from bubbling
     * @param {Boolean} preventDefault (optional) true to prevent the default action too
     * @return {Ext.core.Element} this
     */
    swallowEvent : function(eventName, preventDefault) {
        var me = this;
        function fn(e) {
            e.stopPropagation();
            if (preventDefault) {
                e.preventDefault();
            }
        }
        
        if (Ext.isArray(eventName)) {
            Ext.each(eventName, function(e) {
                 me.on(e, fn);
            });
            return me;
        }
        me.on(eventName, fn);
        return me;
    },

    /**
     * Create an event handler on this element such that when the event fires and is handled by this element,
     * it will be relayed to another object (i.e., fired again as if it originated from that object instead).
     * @param {String} eventName The type of event to relay
     * @param {Object} object Any object that extends {@link Ext.util.Observable} that will provide the context
     * for firing the relayed event
     */
    relayEvent : function(eventName, observable) {
        this.on(eventName, function(e) {
            observable.fireEvent(eventName, e);
        });
    },

    /**
     * Removes Empty, or whitespace filled text nodes. Combines adjacent text nodes.
     * @param {Boolean} forceReclean (optional) By default the element
     * keeps track if it has been cleaned already so
     * you can call this over and over. However, if you update the element and
     * need to force a reclean, you can pass true.
     */
    clean : function(forceReclean) {
        var me  = this,
            dom = me.dom,
            n   = dom.firstChild,
            nx,
            ni  = -1;

        if (Ext.core.Element.data(dom, 'isCleaned') && forceReclean !== true) {
            return me;
        }

        while (n) {
            nx = n.nextSibling;
            if (n.nodeType == 3) {
                // Remove empty/whitespace text nodes
                if (!(/\S/.test(n.nodeValue))) {
                    dom.removeChild(n);
                // Combine adjacent text nodes
                } else if (nx && nx.nodeType == 3) {
                    n.appendData(Ext.String.trim(nx.data));
                    dom.removeChild(nx);
                    nx = n.nextSibling;
                    n.nodeIndex = ++ni;
                }
            } else {
                // Recursively clean
                Ext.fly(n).clean();
                n.nodeIndex = ++ni;
            }
            n = nx;
        }

        Ext.core.Element.data(dom, 'isCleaned', true);
        return me;
    },

    /**
     * Direct access to the Ext.ElementLoader {@link Ext.ElementLoader#load} method. The method takes the same object
     * parameter as {@link Ext.ElementLoader#load}
     * @return {Ext.core.Element} this
     */
    load : function(options) {
        this.getLoader().load(options);
        return this;
    },

    /**
    * Gets this element's {@link Ext.ElementLoader ElementLoader}
    * @return {Ext.ElementLoader} The loader
    */
    getLoader : function() {
        var dom = this.dom,
            data = Ext.core.Element.data,
            loader = data(dom, 'loader');
            
        if (!loader) {
            loader = Ext.create('Ext.ElementLoader', {
                target: this
            });
            data(dom, 'loader', loader);
        }
        return loader;
    },

    /**
    * Update the innerHTML of this element, optionally searching for and processing scripts
    * @param {String} html The new HTML
    * @param {Boolean} loadScripts (optional) True to look for and process scripts (defaults to false)
    * @param {Function} callback (optional) For async script loading you can be notified when the update completes
    * @return {Ext.core.Element} this
     */
    update : function(html, loadScripts, callback) {
        var me = this,
            id,
            dom,
            interval;
            
        if (!me.dom) {
            return me;
        }
        html = html || '';
        dom = me.dom;

        if (loadScripts !== true) {
            dom.innerHTML = html;
            Ext.callback(callback, me);
            return me;
        }

        id  = Ext.id();
        html += '<span id="' + id + '"></span>';

        interval = setInterval(function(){
            if (!document.getElementById(id)) {
                return false;    
            }
            clearInterval(interval);
            var DOC    = document,
                hd     = DOC.getElementsByTagName("head")[0],
                re     = /(?:<script([^>]*)?>)((\n|\r|.)*?)(?:<\/script>)/ig,
                srcRe  = /\ssrc=([\'\"])(.*?)\1/i,
                typeRe = /\stype=([\'\"])(.*?)\1/i,
                match,
                attrs,
                srcMatch,
                typeMatch,
                el,
                s;

            while ((match = re.exec(html))) {
                attrs = match[1];
                srcMatch = attrs ? attrs.match(srcRe) : false;
                if (srcMatch && srcMatch[2]) {
                   s = DOC.createElement("script");
                   s.src = srcMatch[2];
                   typeMatch = attrs.match(typeRe);
                   if (typeMatch && typeMatch[2]) {
                       s.type = typeMatch[2];
                   }
                   hd.appendChild(s);
                } else if (match[2] && match[2].length > 0) {
                    if (window.execScript) {
                       window.execScript(match[2]);
                    } else {
                       window.eval(match[2]);
                    }
                }
            }
            
            el = DOC.getElementById(id);
            if (el) {
                Ext.removeNode(el);
            }
            Ext.callback(callback, me);
        }, 20);
        dom.innerHTML = html.replace(/(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)/ig, '');
        return me;
    },

    // inherit docs, overridden so we can add removeAnchor
    removeAllListeners : function() {
        this.removeAnchor();
        Ext.EventManager.removeAll(this.dom);
        return this;
    },

    /**
     * Creates a proxy element of this element
     * @param {String/Object} config The class name of the proxy element or a DomHelper config object
     * @param {String/HTMLElement} renderTo (optional) The element or element id to render the proxy to (defaults to document.body)
     * @param {Boolean} matchBox (optional) True to align and size the proxy to this element now (defaults to false)
     * @return {Ext.core.Element} The new proxy element
     */
    createProxy : function(config, renderTo, matchBox) {
        config = (typeof config == 'object') ? config : {tag : "div", cls: config};

        var me = this,
            proxy = renderTo ? Ext.core.DomHelper.append(renderTo, config, true) :
                               Ext.core.DomHelper.insertBefore(me.dom, config, true);

        proxy.setVisibilityMode(Ext.core.Element.DISPLAY);
        proxy.hide();
        if (matchBox && me.setBox && me.getBox) { // check to make sure Element.position.js is loaded
           proxy.setBox(me.getBox());
        }
        return proxy;
    }
});
Ext.core.Element.prototype.clearListeners = Ext.core.Element.prototype.removeAllListeners;
