/**
 * @class Ext.dom.AbstractElement
 */
Ext.dom.AbstractElement.override({
    /**
     * Looks at this node and then at parent nodes for a match of the passed simple selector (e.g. div.some-class or span:first-child)
     * @param {String} selector The simple selector to test
     * @param {Number/String/HTMLElement/Ext.Element} [limit]
     * The max depth to search as a number or an element which causes the upward traversal to stop
     * and is <b>not</b> considered for inclusion as the result. (defaults to 50 || document.documentElement)
     * @param {Boolean} [returnEl=false] True to return a Ext.Element object instead of DOM node
     * @return {HTMLElement} The matching DOM node (or null if no match was found)
     */
    findParent: function(simpleSelector, limit, returnEl) {
        var target = this.dom,
            topmost = document.documentElement,
            depth = 0,
            stopEl;

        limit = limit || 50;
        if (isNaN(limit)) {
            stopEl = Ext.getDom(limit);
            limit = Number.MAX_VALUE;
        }
        while (target && target.nodeType == 1 && depth < limit && target != topmost && target != stopEl) {
            if (Ext.DomQuery.is(target, simpleSelector)) {
                return returnEl ? Ext.get(target) : target;
            }
            depth++;
            target = target.parentNode;
        }
        return null;
    },

    /**
     * Looks at parent nodes for a match of the passed simple selector (e.g. div.some-class or span:first-child)
     * @param {String} selector The simple selector to test
     * @param {Number/String/HTMLElement/Ext.Element} [limit]
     * The max depth to search as a number or an element which causes the upward traversal to stop
     * and is <b>not</b> considered for inclusion as the result. (defaults to 50 || document.documentElement)
     * @param {Boolean} [returnEl=false] True to return a Ext.Element object instead of DOM node
     * @return {HTMLElement} The matching DOM node (or null if no match was found)
     */
    findParentNode: function(simpleSelector, limit, returnEl) {
        var p = Ext.fly(this.dom.parentNode, '_internal');
        return p ? p.findParent(simpleSelector, limit, returnEl) : null;
    },

    /**
     * Walks up the dom looking for a parent node that matches the passed simple selector (e.g. div.some-class or span:first-child).
     * This is a shortcut for findParentNode() that always returns an Ext.dom.Element.
     * @param {String} selector The simple selector to test
     * @param {Number/String/HTMLElement/Ext.Element} [limit]
     * The max depth to search as a number or an element which causes the upward traversal to stop
     * and is <b>not</b> considered for inclusion as the result. (defaults to 50 || document.documentElement)
     * @return {Ext.Element} The matching DOM node (or null if no match was found)
     */
    up: function(simpleSelector, limit) {
        return this.findParentNode(simpleSelector, limit, true);
    },

    /**
     * Creates a {@link Ext.CompositeElement} for child nodes based on the passed CSS selector (the selector should not contain an id).
     * @param {String} selector The CSS selector
     * @param {Boolean} [unique] True to create a unique Ext.Element for each element. Defaults to a shared flyweight object.
     * @return {Ext.CompositeElement} The composite element
     */
    select: function(selector, composite) {
        return Ext.dom.Element.select(selector, this.dom, composite);
    },

    /**
     * Selects child nodes based on the passed CSS selector (the selector should not contain an id).
     * @param {String} selector The CSS selector
     * @return {HTMLElement[]} An array of the matched nodes
     */
    query: function(selector) {
        return Ext.DomQuery.select(selector, this.dom);
    },

    /**
     * Selects a single child at any depth below this element based on the passed CSS selector (the selector should not contain an id).
     * @param {String} selector The CSS selector
     * @param {Boolean} [returnDom=false] True to return the DOM node instead of Ext.dom.Element
     * @return {HTMLElement/Ext.dom.Element} The child Ext.dom.Element (or DOM node if returnDom = true)
     */
    down: function(selector, returnDom) {
        var n = Ext.DomQuery.selectNode(selector, this.dom);
        return returnDom ? n : Ext.get(n);
    },

    /**
     * Selects a single *direct* child based on the passed CSS selector (the selector should not contain an id).
     * @param {String} selector The CSS selector
     * @param {Boolean} [returnDom=false] True to return the DOM node instead of Ext.dom.Element.
     * @return {HTMLElement/Ext.dom.Element} The child Ext.dom.Element (or DOM node if returnDom = true)
     */
    child: function(selector, returnDom) {
        var node,
            me = this,
            id;

        // Pull the ID from the DOM (Ext.id also ensures that there *is* an ID).
        // If this object is a Flyweight, it will not have an ID
        id = Ext.id(me.dom);
        // Escape "invalid" chars
        id = Ext.escapeId(id);
        node = Ext.DomQuery.selectNode('#' + id + " > " + selector, me.dom);
        return returnDom ? node : Ext.get(node);
    },

     /**
     * Gets the parent node for this element, optionally chaining up trying to match a selector
     * @param {String} [selector] Find a parent node that matches the passed simple selector
     * @param {Boolean} [returnDom=false] True to return a raw dom node instead of an Ext.dom.Element
     * @return {Ext.dom.Element/HTMLElement} The parent node or null
     */
    parent: function(selector, returnDom) {
        return this.matchNode('parentNode', 'parentNode', selector, returnDom);
    },

     /**
     * Gets the next sibling, skipping text nodes
     * @param {String} [selector] Find the next sibling that matches the passed simple selector
     * @param {Boolean} [returnDom=false] True to return a raw dom node instead of an Ext.dom.Element
     * @return {Ext.dom.Element/HTMLElement} The next sibling or null
     */
    next: function(selector, returnDom) {
        return this.matchNode('nextSibling', 'nextSibling', selector, returnDom);
    },

    /**
     * Gets the previous sibling, skipping text nodes
     * @param {String} [selector] Find the previous sibling that matches the passed simple selector
     * @param {Boolean} [returnDom=false] True to return a raw dom node instead of an Ext.dom.Element
     * @return {Ext.dom.Element/HTMLElement} The previous sibling or null
     */
    prev: function(selector, returnDom) {
        return this.matchNode('previousSibling', 'previousSibling', selector, returnDom);
    },


    /**
     * Gets the first child, skipping text nodes
     * @param {String} [selector] Find the next sibling that matches the passed simple selector
     * @param {Boolean} [returnDom=false] True to return a raw dom node instead of an Ext.dom.Element
     * @return {Ext.dom.Element/HTMLElement} The first child or null
     */
    first: function(selector, returnDom) {
        return this.matchNode('nextSibling', 'firstChild', selector, returnDom);
    },

    /**
     * Gets the last child, skipping text nodes
     * @param {String} [selector] Find the previous sibling that matches the passed simple selector
     * @param {Boolean} [returnDom=false] True to return a raw dom node instead of an Ext.dom.Element
     * @return {Ext.dom.Element/HTMLElement} The last child or null
     */
    last: function(selector, returnDom) {
        return this.matchNode('previousSibling', 'lastChild', selector, returnDom);
    },

    matchNode: function(dir, start, selector, returnDom) {
        if (!this.dom) {
            return null;
        }

        var n = this.dom[start];
        while (n) {
            if (n.nodeType == 1 && (!selector || Ext.DomQuery.is(n, selector))) {
                return !returnDom ? Ext.get(n) : n;
            }
            n = n[dir];
        }
        return null;
    },

    isAncestor: function(element) {
        return this.self.isAncestor.call(this.self, this.dom, element);
    }
});
