utils.js

define(function(require, exports, module) {


	var utils = {};


	/*
	 * Returns epoch, seconds since 1970.
	 * Used for calculation of expire times.
	 */
	utils.epoch = function() {
		return Math.round(new Date().getTime()/1000.0);
	}


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



	utils.parseQueryString = function (qs) {
		var e,
			a = /\+/g,  // Regex for replacing addition symbol with a space
			r = /([^&;=]+)=?([^&;]*)/g,
			d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
			q = qs,
			urlParams = {};

		while (e = r.exec(q))
		   urlParams[d(e[1])] = d(e[2]);

		return urlParams;
	}





	/**
	 * Utility: scopeList(scopes )
	 * Takes a list of scopes that might be overlapping, and removed duplicates,
	 * then concatenates the list by spaces and returns a string.
	 * 
	 * @param  {[type]} scopes [description]
	 * @return {[type]}        [description]
	 */
	utils.scopeList = function(scopes) {
		return utils.uniqueList(scopes).join(' ');
	}


	utils.uniqueList = function(items) {
		var uniqueItems = {};
		var resultItems = [];
		for(var i = 0; i < items.length; i++) {
			uniqueItems[items[i]] = 1;
		}
		for(var key in uniqueItems) {
			if (uniqueItems.hasOwnProperty(key)) {
				resultItems.push(key);
			}
		}
		return resultItems;
	}





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

	/**
	 * A log wrapper, that only logs if logging is turned on in the config
	 * @param  {string} msg Log message
	 */
	utils.log = function(msg) {
		// if (!options.debug) return;
		if (!console) return;
		if (!console.log) return;

		// console.log("LOG(), Arguments", arguments, msg)
		if (arguments.length > 1) {
			console.log(arguments);	
		} else {
			console.log(msg);
		}
		
	}

	/**
	 * Set the global options.
	 */
	// utils.setOptions = function(opts) {
	// 	if (!opts) return;
	// 	for(var k in opts) {
	// 		if (opts.hasOwnProperty(k)) {
	// 			options[k] = opts[k];
	// 		}
	// 	}
	// 	log("Options is set to ", options);
	// }


	/* 
	 * Takes an URL as input and a params object.
	 * Each property in the params is added to the url as query string parameters
	 */
	utils.encodeURL = function(url, params) {
		var res = url;
		var k, i = 0;
		var firstSeparator = (url.indexOf("?") === -1) ? '?' : '&';
		for(k in params) {
			res += (i++ === 0 ? firstSeparator : '&') + encodeURIComponent(k) + '=' + encodeURIComponent(params[k]);
		}
		return res;
	}

	/*
	 * Returns epoch, seconds since 1970.
	 * Used for calculation of expire times.
	 */
	utils.epoch = function() {
		return Math.round(new Date().getTime()/1000.0);
	}




	return utils;

});