/**
 * ElementUtils.js
 *
 * Copyright, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * Utility class for various element specific functions.
 *
 * @private
 */
define("tinymce/dom/ElementUtils", [
	"tinymce/dom/BookmarkManager",
	"tinymce/util/Tools"
], function(BookmarkManager, Tools) {
	var each = Tools.each;

	function ElementUtils(dom) {
		/**
		 * Compares two nodes and checks if it's attributes and styles matches.
		 * This doesn't compare classes as items since their order is significant.
		 *
		 * @method compare
		 * @param {Node} node1 First node to compare with.
		 * @param {Node} node2 Second node to compare with.
		 * @return {boolean} True/false if the nodes are the same or not.
		 */
		this.compare = function(node1, node2) {
			// Not the same name
			if (node1.nodeName != node2.nodeName) {
				return false;
			}

			/**
			 * Returns all the nodes attributes excluding internal ones, styles and classes.
			 *
			 * @private
			 * @param {Node} node Node to get attributes from.
			 * @return {Object} Name/value object with attributes and attribute values.
			 */
			function getAttribs(node) {
				var attribs = {};

				each(dom.getAttribs(node), function(attr) {
					var name = attr.nodeName.toLowerCase();

					// Don't compare internal attributes or style
					if (name.indexOf('_') !== 0 && name !== 'style' && name !== 'data-mce-style') {
						attribs[name] = dom.getAttrib(node, name);
					}
				});

				return attribs;
			}

			/**
			 * Compares two objects checks if it's key + value exists in the other one.
			 *
			 * @private
			 * @param {Object} obj1 First object to compare.
			 * @param {Object} obj2 Second object to compare.
			 * @return {boolean} True/false if the objects matches or not.
			 */
			function compareObjects(obj1, obj2) {
				var value, name;

				for (name in obj1) {
					// Obj1 has item obj2 doesn't have
					if (obj1.hasOwnProperty(name)) {
						value = obj2[name];

						// Obj2 doesn't have obj1 item
						if (typeof value == "undefined") {
							return false;
						}

						// Obj2 item has a different value
						if (obj1[name] != value) {
							return false;
						}

						// Delete similar value
						delete obj2[name];
					}
				}

				// Check if obj 2 has something obj 1 doesn't have
				for (name in obj2) {
					// Obj2 has item obj1 doesn't have
					if (obj2.hasOwnProperty(name)) {
						return false;
					}
				}

				return true;
			}

			// Attribs are not the same
			if (!compareObjects(getAttribs(node1), getAttribs(node2))) {
				return false;
			}

			// Styles are not the same
			if (!compareObjects(dom.parseStyle(dom.getAttrib(node1, 'style')), dom.parseStyle(dom.getAttrib(node2, 'style')))) {
				return false;
			}

			return !BookmarkManager.isBookmarkNode(node1) && !BookmarkManager.isBookmarkNode(node2);
		};
	}

	return ElementUtils;
});
