(function(w) {
	"use strict";
	var uncode = 'uncodeAI',
		path = ';path=',
		doc = document,
		winWidth = w.innerWidth,
		screenWidth = screen.width,
		screenHeight = screen.height,
		cookies = {},
		cssBreakpoint,
		cookieRecorded = false,
		looped = false,
		cookiesEnable = navigator.cookieEnabled;

	/**
	 * Extract the uncode cookie values
	 *
	 * @return {Object}				uncode cookie values
	 */
	var getuncodeCookies = function() {
		for (var index = 0, cookieParts = doc.cookie.split(';'), cookiePattern = /^\suncodeAI\.([^=]+)=(.*?)\s*$/, cookies = {}, cookie; index < cookieParts.length; ++index) {
			if (cookie = cookieParts[index].match(cookiePattern)) {
				cookies[cookie[1]] = cookie[2];
			}
		}
		return cookies;
	}
	/**
	 * Measure the window width in em
	 *
	 * @return {Number}				Window width in em
	 */
	var measureWindowEmWidth = function(precision, f) {
		precision = Math.max(parseFloat(precision || 1, 10), .01);
		var docElement = doc.documentElement,
			createBlock = function() {
				var block = doc.createElement('div'),
					blockStyles = {
						'width': '1px',
						'height': '1px',
						'display': 'inline-block'
					};
				for (var property in blockStyles) {
					block.style[property] = blockStyles[property];
				}
				return block;
			},
			blockRow = doc.createElement('div'),
			block = blockRow.appendChild(createBlock());
		blockRow.appendChild(createBlock());
		docElement.appendChild(blockRow);
		var blockHeight = blockRow.clientHeight,
			ems = Math.floor(winWidth / blockHeight),
			delta = ems / 2,
			iteration = 0,
			iterations = [ems];
		// Iteratetively resize the measurement block until the breakpoint is found (taking the given precision into account)
		while ((iteration++ < 1000) && ((Math.abs(delta) > precision) || (blockRow.clientHeight > blockHeight))) {
			ems += delta;
			block.style.width = ems + 'em';
			delta /= ((blockRow.clientHeight > blockHeight) ? 1 : -1) * ((delta > 0) ? -2 : 2);
			iterations.push(ems);
		}
		// Remove the measurement elements
		docElement.removeChild(blockRow);
		return ems;
	}
	/**
	 * Extract the image breakpoints
	 *
	 * @param {String} str		Serialized breakpoints list
	 * @return {Array}			Ordered breakpoints list
	 */
	var getBreakpoints = function(str, emf) {
		// Split the breakpoint list and run through all breakpoints
		for (var index = 0, rawBreakpoints = (str || '').split(','), breakpointPattern = /(\d+(?:\.\d+)?)(px)?/i, breakpoints = [], match; index < rawBreakpoints.length; ++index) {
			// If this is a valid breakpoint definition (may have a "px" unit)
			if (match = rawBreakpoints[index].match(breakpointPattern)) {
				breakpoints.push(parseFloat(match[1], 10));
			}
		}
		// Sort the breakpoints in ascending order
		return breakpoints.sort(function(a, b) {
			return a - b;
		});
	}
	/**
	 * Return the device pixel ratio
	 *
	 * @return {Number}			Device pixel ratio
	 */
	var getDevicePixelRatio = function() {
		var ratio = ('devicePixelRatio' in w) ? w.devicePixelRatio : ((('deviceXDPI' in w) && ('logicalXDPI' in w)) ? (w.deviceXDPI / w.logicalXDPI) : 1);
		return ratio;
	}
	/**
	 * Round a floating point value to a certain precision
	 *
	 * @param {Number}			Floating point value
	 * @param {Number}			Precision
	 * @param {Number}			Rounded floating point value
	 */
	var roundToPrecision = function(em, precision) {
		return precision * Math.round(10 * em / precision) / 10;
	}
	if (cookiesEnable) cookies = getuncodeCookies();
	if (cookies.images !== undefined) cookieRecorded = true;
	// Run through all document JavaScripts and find the uncode script (must reference a script file with ID attribute = "uncodeAI")
	for (var index = 0, scripts = doc.getElementsByTagName('script'); index < scripts.length; ++index) {
		if (scripts[index].id == uncode) {
			var pixelRatio = getDevicePixelRatio();
			var imgBreakpoint = '2880';
			var limitDensity = scripts[index].getAttribute('data-limit-density');
			var secureFlag = location.protocol === 'https:' ? ';secure' : '';

			pixelRatio = limitDensity && pixelRatio > 2 ? 2 : pixelRatio;

			path = path + scripts[index].getAttribute('data-home');
			if (scripts[index].getAttribute('data-async') == 'true') cookiesEnable = false;
			// Set the general screen size cookie
			if (cookiesEnable) doc.cookie = uncode + '.screen=' + screenWidth + path + secureFlag; // + 'x' + screenHeight + '@' + pixelRatio + path;
			w.uncodeScreen = screenWidth;
			// Set the image engine cookie (if enabled)
			if (!scripts[index].getAttribute('data-disable-images')) {
				var breakpoints = getBreakpoints(scripts[index].getAttribute('data-breakpoints-images'));
				var useOrientationWidth = scripts[index].getAttribute('data-use-orientation-width');
				var maximum = useOrientationWidth ? screenWidth : Math.max(screenWidth, screenHeight);
				var nextBreakpoint = null;

				maximum = pixelRatio > 1 ? (maximum * pixelRatio) : maximum;

				do {
					if (maximum > (nextBreakpoint = breakpoints.pop())) {
						break;
					}

					imgBreakpoint = nextBreakpoint;
				} while (breakpoints.length);
			}

			if (cookiesEnable) {
				doc.cookie = uncode + '.images=' + imgBreakpoint + path + secureFlag;
			}

			w.uncodeImages = imgBreakpoint;

			// Determine the uncode cookie values
			if (cookiesEnable) {
				cookies = getuncodeCookies();
				cssBreakpoint = cookies.css || '-';
				if ((!('css' in cookies) || !cookies.css || (cookies.css == '-')) && !scripts[index].getAttribute('data-disable-css')) {
					var emRatio = winWidth / measureWindowEmWidth(parseFloat(scripts[index].getAttribute('data-em-precision') || .5, 10) / 100);
					cssBreakpoint = screenWidth + 'x' + screenHeight + '@' + (Math.round(emRatio * 10) / 10);
				}
				doc.cookie = uncode + '.css=' + cssBreakpoint + path + secureFlag;
			}
			break;
		}
	}

})(this);