//utils
(function() {
	window.Utils = {};

	Utils.uuidv4 = function() {
		return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
			var r = Math.random() * 16 | 0;
			var v = c == 'x' ? r : (r & 0x3 | 0x8);
			return v.toString(16);
		});
	};

	Utils.ellipsis = function(text, maxLength) {
		if (typeof maxLength === 'undefined') {
			maxLength = 9000; //a large number
		}
		if (typeof text === 'undefined') {
			return '';
		}
		if (text.length <= maxLength) {
			return text;
		}

		var xMaxFit = maxLength - 1;
		var xTruncateAt = text.lastIndexOf(' ', xMaxFit);
		if (xTruncateAt == -1 || xTruncateAt < maxLength / 2) {
			xTruncateAt = xMaxFit;
		}

		return text.substr(0, xTruncateAt) + '…';
	};

	Utils.getSelectionText = function() {
		var text = '';
		if (window.getSelection) {
			text = window.getSelection().toString();
		} else if (document.selection && document.selection.type != 'Control') {
			text = document.selection.createRange().text;
		}
		return text;
	};

	Utils.getParameterByName = function(name) {
		name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
		var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
		var results = regex.exec(location.search);
		return results == null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
	};

	Utils.isElementInViewport = function(el) {
		//special bonus for those using jQuery
		if (typeof jQuery === 'function' && el instanceof jQuery) {
			el = el[0];
		}

		var rect = el.getBoundingClientRect();

		return (
			rect.top >= 0 &&
			rect.left >= 0 &&
			rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && /*or $(window).height() */
			rect.right <= (window.innerWidth || document.documentElement.clientWidth) /*or $(window).width() */
		);
	};

	Utils.getUserColor = function(userstring) {
		var hashCode = function(str) {
			var hash = 0;
			for (var i = 0; i < str.length; i++) {
				hash = str.charCodeAt(i) + ((hash << 5) - hash);
			}
			return hash;
		};

		var intToRGB = function(i) {
			var c = (i & 0x00FFFFFF)
			.toString(16)
			.toUpperCase();

			return '#00000'.substring(0, 6 - c.length) + c;
		};

		var intToHSL = function(i) {
			var shortened = Math.abs(i) % 360;
			var l = 40 - (Math.abs(i) % 20);
			return 'hsl(' + shortened + ',100%,' + l + '%)';
		};

		return (userstring ? intToHSL(hashCode(userstring)) : '3a87ad');
	};
})();