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(function () {
	"use strict";
	var gFn = function (attr) {
		return function () {
			return this[attr];
		};
	};
	
	var sFn = function (attr) {
		return function (val) {
			this[attr] = val;
			return this;
		};
	};
	var attrs = ["years", "months", "days", "hours", "minutes", "seconds", "milliseconds"];
	var addSetFuncs = function (context, attrs) {
		for (var i = 0; i < attrs.length ; i++) {
			var $a = attrs[i], $b = $a.slice(0, 1).toUpperCase() + $a.slice(1);
			context.prototype[$a] = 0;
			context.prototype["get" + $b] = gFn($a);
			context.prototype["set" + $b] = sFn($a);
		}
	};
	/**
	 * new TimeSpan(milliseconds);
	 * new TimeSpan(days, hours, minutes, seconds);
	 * new TimeSpan(days, hours, minutes, seconds, milliseconds);
	 */
	var TimeSpan = function (days, hours, minutes, seconds, milliseconds) {
		if (arguments.length === 1 && typeof days === "number") {
			var orient = (days < 0) ? -1 : +1;
			var millsLeft = Math.abs(days);
			this.setDays(Math.floor(millsLeft / 86400000) * orient);
			millsLeft = millsLeft % 86400000;
			this.setHours(Math.floor(millsLeft / 3600000) * orient);
			millsLeft = millsLeft % 3600000;
			this.setMinutes(Math.floor(millsLeft / 60000) * orient);
			millsLeft = millsLeft % 60000;
			this.setSeconds(Math.floor(millsLeft / 1000) * orient);
			millsLeft = millsLeft % 1000;
			this.setMilliseconds(millsLeft * orient);
		} else {
			this.set(days, hours, minutes, seconds, milliseconds);
		}

		this.getTotalMilliseconds = function () {
			return	(this.getDays() * 86400000) +
					(this.getHours() * 3600000) +
					(this.getMinutes() * 60000) +
					(this.getSeconds() * 1000);
		};
		
		this.compareTo = function (time) {
			var t1 = new Date(1970, 1, 1, this.getHours(), this.getMinutes(), this.getSeconds()), t2;
			if (time === null) {
				t2 = new Date(1970, 1, 1, 0, 0, 0);
			}
			else {
				t2 = new Date(1970, 1, 1, time.getHours(), time.getMinutes(), time.getSeconds());
			}
			return (t1 < t2) ? -1 : (t1 > t2) ? 1 : 0;
		};

		this.equals = function (time) {
			return (this.compareTo(time) === 0);
		};

		this.add = function (time) {
			return (time === null) ? this : this.addSeconds(time.getTotalMilliseconds() / 1000);
		};

		this.subtract = function (time) {
			return (time === null) ? this : this.addSeconds(-time.getTotalMilliseconds() / 1000);
		};

		this.addDays = function (n) {
			return new TimeSpan(this.getTotalMilliseconds() + (n * 86400000));
		};

		this.addHours = function (n) {
			return new TimeSpan(this.getTotalMilliseconds() + (n * 3600000));
		};

		this.addMinutes = function (n) {
			return new TimeSpan(this.getTotalMilliseconds() + (n * 60000));
		};

		this.addSeconds = function (n) {
			return new TimeSpan(this.getTotalMilliseconds() + (n * 1000));
		};

		this.addMilliseconds = function (n) {
			return new TimeSpan(this.getTotalMilliseconds() + n);
		};

		this.get12HourHour = function () {
			return (this.getHours() > 12) ? this.getHours() - 12 : (this.getHours() === 0) ? 12 : this.getHours();
		};

		this.getDesignator = function () {
			return (this.getHours() < 12) ? Date.CultureInfo.amDesignator : Date.CultureInfo.pmDesignator;
		};

		this.toString = function (format) {
			this._toString = function () {
				if (this.getDays() !== null && this.getDays() > 0) {
					return this.getDays() + "." + this.getHours() + ":" + this.p(this.getMinutes()) + ":" + this.p(this.getSeconds());
				} else {
					return this.getHours() + ":" + this.p(this.getMinutes()) + ":" + this.p(this.getSeconds());
				}
			};
			
			this.p = function (s) {
				return (s.toString().length < 2) ? "0" + s : s;
			};
			
			var me = this;
			
			return format ? format.replace(/dd?|HH?|hh?|mm?|ss?|tt?/g,
			function (format) {
				switch (format) {
				case "d":
					return me.getDays();
				case "dd":
					return me.p(me.getDays());
				case "H":
					return me.getHours();
				case "HH":
					return me.p(me.getHours());
				case "h":
					return me.get12HourHour();
				case "hh":
					return me.p(me.get12HourHour());
				case "m":
					return me.getMinutes();
				case "mm":
					return me.p(me.getMinutes());
				case "s":
					return me.getSeconds();
				case "ss":
					return me.p(me.getSeconds());
				case "t":
					return ((me.getHours() < 12) ? Date.CultureInfo.amDesignator : Date.CultureInfo.pmDesignator).substring(0, 1);
				case "tt":
					return (me.getHours() < 12) ? Date.CultureInfo.amDesignator : Date.CultureInfo.pmDesignator;
				}
			}
			) : this._toString();
		};
		return this;
	};
	addSetFuncs(TimeSpan, attrs.slice(2));
	TimeSpan.prototype.set = function (days, hours, minutes, seconds, milliseconds){
		this.setDays(days || this.getDays());
		this.setHours(hours || this.getHours());
		this.setMinutes(minutes || this.getMinutes());
		this.setSeconds(seconds || this.getSeconds());
		this.setMilliseconds(milliseconds || this.getMilliseconds());
	};


	/**
	 * Gets the time of day for this date instances. 
	 * @return {TimeSpan} TimeSpan
	 */
	Date.prototype.getTimeOfDay = function () {
		return new TimeSpan(0, this.getHours(), this.getMinutes(), this.getSeconds(), this.getMilliseconds());
	};

	Date.TimeSpan = TimeSpan;

	if (typeof window !== "undefined" ) {
		// keeping API compatible for v1.x 
		window.TimeSpan = TimeSpan;
	}
}());