/**
 * @author alexander.farkas
 * @version 1.2
 */
(function($) {
	$.testMedia = function(str) {
		var date = new Date().getTime(), styleS, div = $('<div class="testMediaQuery' + date + '"></div>').css({
			visibility : 'hidden',
			position : 'absolute'
		}).appendTo('body'), style = document.createElement('style');
		style.setAttribute('type', 'text/css');
		style.setAttribute('media', str);
		style = $(style).prependTo('head');
		styleS = document.styleSheets[0];
		if(styleS.cssRules || styleS.rules) {
			if(styleS.insertRule) {
				styleS.insertRule('.testMediaQuery' + date + ' {display:none !important;}', styleS.cssRules.length);
			} else if(styleS.addRule) {
				styleS.addRule('.testMediaQuery' + date, 'display:none');
			}
		}
		var ret = div.css('display') === 'none';
		div.remove();
		style.remove();
		return ret;
	};
	$.arrayInString = function(str, arr) {
		var ret = -1;
		$.each(arr, function(i, item) {
			if(str.indexOf(item) != -1) {
				ret = i;
				return false;
			}
		});
		return ret;
	};
	$.enableMediaQuery = (function() {
		var styles = [], styleLinks, date = new Date().getTime();
		function parseMedia(link) {
			var medias = link.getAttribute('media'), pMin = /\(\s*min-width\s*:\s*(\d+)px\s*\)/, pMax = /\(\s*max-width\s*:\s*(\d+)px\s*\)/, resMin, resMax, supportedMedia = ['handheld', 'all', 'screen', 'projection', 'tty', 'tv', 'print'], curMedia, mediaString = [];
			medias = (!medias) ? ['all'] : medias.split(',');

			for(var i = 0, len = medias.length; i < len; i++) {
				curMedia = $.arrayInString(medias[i], supportedMedia);

				if(curMedia != -1) {
					curMedia = supportedMedia[curMedia];
					if(!resMin) {
						resMin = pMin.exec(medias[i]);
						if(resMin) {
							resMin = parseInt(resMin[1], 10);
						}
					}
					if(!resMax) {
						resMax = pMax.exec(medias[i]);
						if(resMax) {
							resMax = parseInt(resMax[1], 10);
						}
					}
					mediaString.push(curMedia);
				}
			}
			if(resMin || resMax) {
				styles.push({
					obj : link,
					min : resMin,
					max : resMax,
					medium : mediaString.join(','),
					used : false
				});
			}
		}

		return {
			init : function() {
				if(!styleLinks) {
					var resizeTimer;
					styleLinks = $('link[rel*=style]').each(function() {
						parseMedia(this);
					});
					$.enableMediaQuery.adjust();
					$(window).bind('resize.mediaQueries', function() {
						clearTimeout(resizeTimer);
						resizeTimer = setTimeout($.enableMediaQuery.adjust, 29);
					});
				}
			},
			adjust : function() {
				var width = $(window).width(), addStyles = [], changeQuery, shouldUse, i, len;

				for( i = 0, len = styles.length; i < len; i++) {
					shouldUse = !styles[i].obj.disabled && ((!(styles[i].min && styles[i].min > width) && !(styles[i].max && styles[i].max < width)) || (!styles[i].max && !styles[i].min));
					if(shouldUse) {
						var n = styles[i].obj.cloneNode(true);
						n.setAttribute('media', styles[i].medium);
						n.className = 'insertStyleforMedia' + date;
						addStyles.push(n);
						if(!styles[i].used) {
							styles[i].used = true;
							changeQuery = true;
						}
					} else if(styles[i].used !== shouldUse) {
						styles[i].used = false;
						changeQuery = true;
					}
				}

				if(changeQuery) {
					$('link.insertStyleforMedia' + date).remove();
					var head = document.getElementsByTagName('head');
					for( i = 0, len = addStyles.length; i < len; i++) {
						head[0].appendChild(addStyles[i]);
					}
					//repaint
					$('body').css('zoom', '1').css('zoom', '');
				}
			}
		};
	})();
	//make some odd assumption before dom-ready
	$.support.mediaQueries = !($.browser.msie && parseFloat($.browser.version, 10) < 9) || ($.browser.mozilla && parseFloat($.browser.version, 10) < 1.9 );
	setTimeout(function() {
		if(!$.isReady && document.body && !$.support.mediaQueries) {
			try {
				$.enableMediaQuery.init();
			} catch (e) {
			}
		}
	}, 1);
	$(function() {
		//test media query compatibility
		$.support.mediaQueries = $.testMedia('only all');
		if(!$.support.mediaQueries) {
			$.enableMediaQuery.init();
		}
	});
})(jQuery);