/*
 * DomUtils
 * Visit http://createjs.com/ for documentation, updates and examples.
 *
 *
 * Copyright (c) 2012 gskinner.com, inc.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * @module PreloadJS
 */

(function () {

	/**
	 * A few utilities for interacting with the dom.
	 * @class DomUtils
	 */
	var s = {
		container: null
	};

	s.appendToHead = function (el) {
		s.getHead().appendChild(el);
	}

	s.appendToBody = function (el) {
		if (s.container == null) {
			s.container = document.createElement("div");
			s.container.id = "preloadjs-container";
			var style = s.container.style;
			style.visibility = "hidden";
			style.position = "absolute";
			style.width = s.container.style.height = "10px";
			style.overflow = "hidden";
			style.transform = style.msTransform = style.webkitTransform = style.oTransform = "translate(-10px, -10px)"; //LM: Not working
			s.getBody().appendChild(s.container);
		}
		s.container.appendChild(el);
	}

	s.getHead = function () {
		return document.head || document.getElementsByTagName("head")[0];
	}

	s.getBody = function () {
		return document.body || document.getElementsByTagName("body")[0];
	}

	s.removeChild = function(el) {
		if (el.parent) {
			el.parent.removeChild(el);
		}
	}

	/**
	 * Check if item is a valid HTMLImageElement
	 * @method isImageTag
	 * @param {Object} item
	 * @returns {Boolean}
	 * @static
	 */
	s.isImageTag = function(item) {
		return item instanceof HTMLImageElement;
	};

	/**
	 * Check if item is a valid HTMLAudioElement
	 * @method isAudioTag
	 * @param {Object} item
	 * @returns {Boolean}
	 * @static
	 */
	s.isAudioTag = function(item) {
		if (window.HTMLAudioElement) {
			return item instanceof HTMLAudioElement;
		} else {
			return false;
		}
	};

	/**
	 * Check if item is a valid HTMLVideoElement
	 * @method isVideoTag
	 * @param {Object} item
	 * @returns {Boolean}
	 * @static
	 */
	s.isVideoTag = function(item) {
		if (window.HTMLVideoElement) {
			return item instanceof HTMLVideoElement;
		} else {
			return false;
		}
	};

	createjs.DomUtils = s;

}());