/*
 * Date prototype extensions. Doesn't depend on any
 * other code. Doens't overwrite existing methods.
 *
 * Adds dayNames, abbrDayNames, monthNames and abbrMonthNames static properties and isLeapYear,
 * isWeekend, isWeekDay, getDaysInMonth, getDayName, getMonthName, getDayOfYear, getWeekOfYear,
 * setDayOfYear, addYears, addMonths, addDays, addHours, addMinutes, addSeconds methods
 *
 * Copyright (c) 2006 Jörn Zaefferer and Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
 *
 * Additional methods and properties added by Kelvin Luck: firstDayOfWeek, dateFormat, zeroTime, asString, fromString -
 * I've added my name to these methods so you know who to blame if they are broken!
 * 
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 */

Date.dayNames = ['Domenica', 'Lunedi', 'Martedi', 'Mercoledi', 'Giovedi', 'Venerdi', 'Sabato'];
Date.abbrDayNames = ['Dom', 'Lun', 'Mar', 'Mer', 'Gio', 'Ven', 'Sab'];
Date.monthNames = ['Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno', 'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre'];
Date.abbrMonthNames = ['Gen', 'Feb', 'Mar', 'Apr', 'Mag', 'Giu', 'Lug', 'Ago', 'Set', 'Ott', 'Nov', 'Dic'];
Date.firstDayOfWeek = 1;

Date.format = 'dd/mm/yyyy';
//Date.format = 'mm/dd/yyyy';
//Date.format = 'yyyy-mm-dd';
//Date.format = 'dd mmm yy';

Date.fullYearStart = '20';

(function() {

	function add(name, method) {
		if( !Date.prototype[name] ) {
			Date.prototype[name] = method;
		}
	};
	
	add("isLeapYear", function() {
		var y = this.getFullYear();
		return (y%4==0 && y%100!=0) || y%400==0;
	});
	
	add("isWeekend", function() {
		return this.getDay()==0 || this.getDay()==6;
	});
	
	add("isWeekDay", function() {
		return !this.isWeekend();
	});
	
	add("getDaysInMonth", function() {
		return [31,(this.isLeapYear() ? 29:28),31,30,31,30,31,31,30,31,30,31][this.getMonth()];
	});
	
	add("getDayName", function(abbreviated) {
		return abbreviated ? Date.abbrDayNames[this.getDay()] : Date.dayNames[this.getDay()];
	});

	add("getMonthName", function(abbreviated) {
		return abbreviated ? Date.abbrMonthNames[this.getMonth()] : Date.monthNames[this.getMonth()];
	});

	add("getDayOfYear", function() {
		var tmpdtm = new Date("1/1/" + this.getFullYear());
		return Math.floor((this.getTime() - tmpdtm.getTime()) / 86400000);
	});
	
	add("getWeekOfYear", function() {
		return Math.ceil(this.getDayOfYear() / 7);
	});

	add("setDayOfYear", function(day) {
		this.setMonth(0);
		this.setDate(day);
		return this;
	});
	
	add("addYears", function(num) {
		this.setFullYear(this.getFullYear() + num);
		return this;
	});
	
	add("addMonths", function(num) {
		var tmpdtm = this.getDate();
		
		this.setMonth(this.getMonth() + num);
		
		if (tmpdtm > this.getDate())
			this.addDays(-this.getDate());
		
		return this;
	});
	
	add("addDays", function(num) {
		//this.setDate(this.getDate() + num);
		this.setTime(this.getTime() + (num*86400000) );
		return this;
	});
	
	add("addHours", function(num) {
		this.setHours(this.getHours() + num);
		return this;
	});

	add("addMinutes", function(num) {
		this.setMinutes(this.getMinutes() + num);
		return this;
	});
	
	add("addSeconds", function(num) {
		this.setSeconds(this.getSeconds() + num);
		return this;
	});
	
	add("zeroTime", function() {
		this.setMilliseconds(0);
		this.setSeconds(0);
		this.setMinutes(0);
		this.setHours(0);
		return this;
	});
	
	add("asString", function(format) {
		var r = format || Date.format;
		if (r.split('mm').length>1) { // ugly workaround to make sure we don't replace the m's in e.g. noveMber
			r = r.split('mmmm').join(this.getMonthName(false))
				.split('mmm').join(this.getMonthName(true))
				.split('mm').join(_zeroPad(this.getMonth()+1))
		} else {
			r = r.split('m').join(this.getMonth()+1);
		}
		r = r.split('yyyy').join(this.getFullYear())
			.split('yy').join((this.getFullYear() + '').substring(2))
			.split('dd').join(_zeroPad(this.getDate()))
			.split('d').join(this.getDate());
		return r;
	});
	
	Date.fromString = function(s)
	{
		var f = Date.format;
		
		var d = new Date('01/01/1970');
		
		if (s == '') return d;

		s = s.toLowerCase();
		var matcher = '';
		var order = [];
		var r = /(dd?d?|mm?m?|yy?yy?)+([^(m|d|y)])?/g;
		var results;
		while ((results = r.exec(f)) != null)
		{
			switch (results[1]) {
				case 'd':
				case 'dd':
				case 'm':
				case 'mm':
				case 'yy':
				case 'yyyy':
					matcher += '(\\d+\\d?\\d?\\d?)+';
					order.push(results[1].substr(0, 1));
					break;
				case 'mmm':
					matcher += '([a-z]{3})';
					order.push('M');
					break;
			}
			if (results[2]) {
				matcher += results[2];
			}
			
		}
		var dm = new RegExp(matcher);
		var result = s.match(dm);
		for (var i=0; i<order.length; i++) {
			var res = result[i+1];
			switch(order[i]) {
				case 'd':
					d.setDate(res);
					break;
				case 'm':
					d.setMonth(Number(res)-1);
					break;
				case 'M':
					for (var j=0; j<Date.abbrMonthNames.length; j++) {
						if (Date.abbrMonthNames[j].toLowerCase() == res) break;
					}
					d.setMonth(j);
					break;
				case 'y':
					d.setYear(res);
					break;
			}
		}

		return d;
	};
	
	// utility method
	var _zeroPad = function(num) {
		var s = '0'+num;
		return s.substring(s.length-2)
		//return ('0'+num).substring(-2); // doesn't work on IE :(
	};
	
})();