/**
 * @class Ext.DomHelper
 */
Ext.apply(Ext.DomHelper,
function(){
	var pub,
		afterbegin = 'afterbegin',
    	afterend = 'afterend',
    	beforebegin = 'beforebegin',
    	beforeend = 'beforeend';

	// private
    function doInsert(el, o, returnElement, pos, sibling, append){
        el = Ext.getDom(el);
        var newNode;
        if (pub.useDom) {
            newNode = createDom(o, null);
            if (append) {
	            el.appendChild(newNode);
            } else {
	        	(sibling == 'firstChild' ? el : el.parentNode).insertBefore(newNode, el[sibling] || el);
            }
        } else {
            newNode = Ext.DomHelper.insertHtml(pos, el, Ext.DomHelper.createHtml(o));
        }
        return returnElement ? Ext.get(newNode, true) : newNode;
    }

	// build as dom
    /** @ignore */
    function createDom(o, parentNode){
        var el,
        	doc = document,
        	useSet,
        	attr,
        	val,
        	cn;

        if (Ext.isArray(o)) {                       // Allow Arrays of siblings to be inserted
            el = doc.createDocumentFragment(); // in one shot using a DocumentFragment
	        Ext.each(o, function(v) {
                createDom(v, el);
            });
        } else if (Ext.isString(o)) {         // Allow a string as a child spec.
            el = doc.createTextNode(o);
        } else {
            el = doc.createElement( o.tag || 'div' );
            useSet = !!el.setAttribute; // In IE some elements don't have setAttribute
            Ext.iterate(o, function(attr, val){
                if(!/tag|children|cn|html|style/.test(attr)){
	                if(attr == 'cls'){
	                    el.className = val;
	                }else{
                        if(useSet){
                            el.setAttribute(attr, val);
                        }else{
                            el[attr] = val;
                        }
	                }
                }
            });
            pub.applyStyles(el, o.style);

            if ((cn = o.children || o.cn)) {
                createDom(cn, el);
            } else if (o.html) {
                el.innerHTML = o.html;
            }
        }
        if(parentNode){
           parentNode.appendChild(el);
        }
        return el;
    }

	pub = {
		
/**
	     * Creates a new Ext.Template from the DOM object spec.
	     * @param {Object} o The DOM object spec (and children)
	     * @return {Ext.Template} The new template
	     */
	    createTemplate : function(o){
	        var html = Ext.DomHelper.createHtml(o);
	        return new Ext.Template(html);
	    },

		
/** True to force the use of DOM instead of html fragments @type Boolean */
	    useDom : false,

	    
/**
	     * Applies a style specification to an element.
	     * @param {String/HTMLElement} el The element to apply styles to
	     * @param {String/Object/Function} styles A style specification string e.g. 'width:100px', or object in the form {width:'100px'}, or
	     * a function which returns such a specification.
	     */
	    applyStyles : function(el, styles){
		    if(styles){
				var i = 0,
	    			len,
	    			style;

	    		el = Ext.fly(el);
				if(Ext.isFunction(styles)){
   					styles = styles.call();
				}
				if(Ext.isString(styles)){
					styles = styles.trim().split(/\s*(?::|;)\s*/);
					for(len = styles.length; i < len;){
						el.setStyle(styles[i++], styles[i++]);
					}
				}else if (Ext.isObject(styles)){
					el.setStyle(styles);
				}
			}
	    },

	    
/**
	     * Creates new DOM element(s) and inserts them before el.
	     * @param {Mixed} el The context element
	     * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
	     * @param {Boolean} returnElement (optional) true to return a Ext.Element
	     * @return {HTMLElement/Ext.Element} The new node
         * @hide (repeat)
	     */
	    insertBefore : function(el, o, returnElement){
	        return doInsert(el, o, returnElement, beforebegin);
	    },

	    
/**
	     * Creates new DOM element(s) and inserts them after el.
	     * @param {Mixed} el The context element
	     * @param {Object} o The DOM object spec (and children)
	     * @param {Boolean} returnElement (optional) true to return a Ext.Element
	     * @return {HTMLElement/Ext.Element} The new node
         * @hide (repeat)
	     */
	    insertAfter : function(el, o, returnElement){
	        return doInsert(el, o, returnElement, afterend, 'nextSibling');
	    },

	    
/**
	     * Creates new DOM element(s) and inserts them as the first child of el.
	     * @param {Mixed} el The context element
	     * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
	     * @param {Boolean} returnElement (optional) true to return a Ext.Element
	     * @return {HTMLElement/Ext.Element} The new node
         * @hide (repeat)
	     */
	    insertFirst : function(el, o, returnElement){
	        return doInsert(el, o, returnElement, afterbegin, 'firstChild');
	    },

	    
/**
	     * Creates new DOM element(s) and appends them to el.
	     * @param {Mixed} el The context element
	     * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
	     * @param {Boolean} returnElement (optional) true to return a Ext.Element
	     * @return {HTMLElement/Ext.Element} The new node
         * @hide (repeat)
	     */
	    append: function(el, o, returnElement){
            return doInsert(el, o, returnElement, beforeend, '', true);
        },

	    
/**
	     * Creates new DOM element(s) without inserting them to the document.
	     * @param {Object/String} o The DOM object spec (and children) or raw HTML blob
	     * @return {HTMLElement} The new uninserted node
	     */
        createDom: createDom
	};
	return pub;
}());