var NYTD = window.NYTD || {};

/*
 * Standard class to work with unencrypted cookies in JS.
 *  Use the NYTD.Cookies.getOrCreate() method to receive a cookie
 *  object to work with.  Details of cookie setting and parsing
 *  are private for protection. Can only modify existing cookies
 *  if this same class was the one that created it.
 */
NYTD.Cookies = {
	getOrCreate: function (cookieName) {
		var cookies = document.cookie.split(';');
		var nameSearchString = cookieName + '=';
		var cookieValueString = '';
		for (var c=0, len=cookies.length; c<len; ++c) {
			 var cur = cookies[c];
			 cur = cur.replace(/^ */, '');
			 if (cur.indexOf(nameSearchString) == 0) {
				  cookieValueString = cur.substring(nameSearchString.length,cur.length);
			 }
		}

		var Cookie = function (name,str) {
			var checkKey = 'creator';
			var checkVal = 'NYTD.Cookies';
			var cookieName = name;
			var cookieString = str || "";
			var keyValPairs = {};

			if (str != "") {
				var checkStr = checkKey + '|' + checkVal;
				if (cookieString.indexOf(checkStr) == -1) {
					throw(name + " cookie was NOT created by the NYTD.Cookies class and can't be modified.");
					return null;
				}
				else {
					var regex = new RegExp(checkStr, "g");
					cookieString.replace(regex, "");
				}
				var pairs = cookieString.split('^');
				for (var p=0, len=pairs.length; p<len; ++p) {
					var cur = pairs[p];
					var vals = cur.split('|');
					keyValPairs[vals[0]] = vals[1];
				}
			}

			var set = function(expirationMillis) {
				var exp = new Date();
				var expirationOffset = expirationMillis || 31536000000; // 1 year default
				var len = 0;
				var keyvals = [];
				if (keyValPairs[checkKey]) {
					delete keyValPairs[checkKey];
				}
				for (key in keyValPairs) {
					if (keyValPairs.hasOwnProperty(key)){
						keyvals.push(key + "|" + keyValPairs[key]);
						len++;
					}
				}
				keyvals.push(checkKey + "|" + checkVal);
				if (len > 0) {
					exp.setTime(exp.getTime() + expirationOffset);
				}
				else {
					exp.setTime(exp.getTime() - 86400000); // set to yesterday, to expire cookie
				}
				var expires = "; expires=" + exp.toGMTString();
				document.cookie = cookieName + "=" + keyvals.join('^') + expires + "; domain=nytimes.com; path=/";
			};

			/*
			 * The following functions are the interface for the Cookie object.
			 */
			this.lookup = function (key) {
				return keyValPairs[key];
			};

			this.add = function (obj, expiration) {
				for (key in obj) {
					if (obj.hasOwnProperty(key)) {
						keyValPairs[key] = obj[key];
					}
				}
				set(expiration);
			};

			this.remove = function () {
				for (var i=0, arg; arg = arguments[i]; ++i) {
					if (keyValPairs[arg]) {
						delete keyValPairs[arg];
					}
				}
				set();
			};
			/* End public interface */
		};

		return new Cookie(cookieName, cookieValueString);
	}
};