var monthInYear = new Array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
var dayInWeek = new Array("sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday");

var calendar = new Calendar();

function Calendar()
{
	this.elementId = "";
	this.element = null;

	this.weekday = 0;
	this.day = 0;
	this.month = 0;
	this.year = 0;

	this.cday = 0;
	this.cmonth = 0;
	this.cyear = 0;
	this.cyear2 = 0;

	this.mappingArray = new Array();

	this.cal = document.getElementById("cal");
	this.cald = document.getElementById("cald");
}

function initCalendar(date)
{
	// PICKED DATE
	calendar.weekday = date.getDay();
	calendar.day = date.getDate();
	calendar.month = date.getMonth() +1;
	calendar.year = date.getFullYear();

	//DATE ON DISPLAY
	calendar.cmonth = calendar.month;
	calendar.cyear = calendar.year;
	calendar.cday = calendar.day;
	
	//CURRENT DATE
	myDate=new Date();
	currentdate=myDate.getDate();
	currentmonth=myDate.getMonth()+1;
	currentyear=myDate.getFullYear();
}

function hideCalendar()
{
	calendar.cal.style.visibility = "hidden";
	calendar.cald.style.visibility = "hidden";
}

function displayCalendar(id)
{
	calendar = new Calendar();
	var i;
	var element;
	for (i=0 ; i<4 ; i++)
	{
		element = document.getElementById("cal_m_0" + i);
	}
	for (i=0 ; i<4 ; i++)
	{
		element = document.getElementById("cal_y_0" + i);
	}
	element = document.getElementById("cal_c");

	calendar.elementId = "";
	calendar.element = document.getElementById(id);
	
	var dateValue = calendar.element.value;
	if (dateValue != "")
	{
		var s = dateValue.split("/");
		var d;
		var m;
		var y;
		var validDate = true;
		if (s.length == 3)
		{
			d = s[0];
			if (d.charAt(0) == "0")
			{
				d = d.substr(1);
			}
			m = s[1];
			if (m.charAt(0) == "0")
			{
				m = m.substr(1);
			}
			y = s[2];
		}
		else
		{
			validDate = false;
		}

		if (validDate)
		{
			initCalendar(new Date(y, m-1, d));
		}
		else
		{
			initCalendar(new Date());
		}
	}
	else
	{
		initCalendar(new Date());
	}
	fillCalendar();
	//show calendar
	calendar.cal.style.visibility = "visible";
	calendar.cald.style.visibility = "visible";
	calendar.dates.style.visibility = "visible";
	
}

function fillCalendar()
{
	document.getElementById("cal_m_02").innerHTML = getStringMonth(calendar.cmonth);
	document.getElementById("cal_y_02").innerHTML = calendar.cyear;
	var element;

	var i = 0;
	var j = 0;
	for (i=0 ; i<6 ; i++)
	{
		for (j=0 ; j<7 ; j++)
		{
			element = document.getElementById("cal_d_" + i + j);
			element.innerHTML = "";
			element.onclick = "";
		}
	}
	i = 0;
	j = (new Date(calendar.cyear, calendar.cmonth-1, 1)).getDay();
	j = (j + 6) % 7;
	var count = 1;
	var days = getMonthLastDay();

	while (count <= days) //as long as the counter is smaller than the number of days in the current month
	{
		element = document.getElementById("cal_d_" + i + j);
		element.innerHTML = count;
			if ((count < currentdate)  && (calendar.cmonth <= currentmonth) && (calendar.cyear <= currentyear))
				 {
				element.className = 'nosel';
				element.onclick = selectionno;
				}
			else
				{
				element.className = 'sel';
				element.onclick = selectDay;
				}

		calendar.mappingArray[10 * i + j] = count;
		j++;
		
		if ((j==2)||(j==4)||(j==6)||(j==7)){ //SPANISH COOKING CLASS
			element.className = 'nosel';
			element.onclick = selectionno;
			}
		
		if (j == 7)
		{
			i++;
			j = 0;
		}
		
		
		count++;
	}
}

function selectionno()
{
	alert('Please select another date'+ '\n' +'Bar crawls are on Tuesay, Thursday and Saturday');
}

function selectDay()
{
	var id = event.srcElement.id;
	calendar.cday = calendar.mappingArray[parseInt(id.substr(id.length - 2))];
	calendar.cal.style.visibility = "hidden";
	calendar.cald.style.visibility = "hidden";
	var d = calendar.cday;
	var m = calendar.cmonth;
	var y = calendar.cyear;
	window.status = d + " - " + m + " - " + y;
	calendar.element.value = (d < 10 ? "0" : "") + d + "/" + (m < 10 ? "0" : "") + m + "/" + y;
}

function incrementMonth()
{
	if (calendar.cmonth == 12)
	{
		if(calendar.cyear < currentyear + 1){
		calendar.cmonth = 1;
		calendar.cyear = calendar.cyear + 1;}
	}
	else 
	{
		if (calendar.cyear < currentyear + 2){
		calendar.cmonth = calendar.cmonth + 1;}
	}
	fillCalendar();
}



function decrementMonthbis()
{
	if (calendar.cmonth == 1)
		{
		if (calendar.cyear > currentyear)
			{
			calendar.cmonth = 12;
			calendar.cyear = calendar.cyear - 1;
			}
		}
	
	else if (calendar.cmonth > currentmonth)
		{
		if(calendar.cyear > calendar.year)
			{
			calendar.cmonth = calendar.cmonth - 1;
			}
		else if (calendar.cyear = currentyear)
			{
			calendar.cmonth = calendar.cmonth - 1;
			}
		}
	else // if selected month is lower than current month : eg. february and april
		{
		calendar.cmonth = calendar.cmonth - 1;
		}
	fillCalendar();
}

function decrementMonth()
{
	if ((calendar.cmonth == 1) && (currentmonth > 1))
			{
				calendar.cmonth = 13;
				calendar.cyear = calendar.cyear - 1;
			}
	
	if (calendar.cmonth > currentmonth)
		{
		if(calendar.cyear > currentyear)
			{
			calendar.cmonth = calendar.cmonth - 1;
			}
		else {
			calendar.cmonth = calendar.cmonth - 1;
			}
		}
	else if(calendar.cmonth = currentmonth)// if selected month is lower than current month : eg. february and april
		{
			if (calendar.cyear > currentyear)
				{
				calendar.cmonth = calendar.cmonth - 1;
				}
		}
	fillCalendar();
}


function incrementYear()
{
	if (calendar.cyear < currentyear +1) // if selected year is maximum in 1 year of time
	calendar.cyear = calendar.cyear + 1;
	fillCalendar();
}

function decrementYear()
{
	if (calendar.cyear > currentyear){//Blocks the calendar. can't go in the past
		if (calendar.cmonth >= currentmonth){
			calendar.cyear = calendar.cyear - 1;
		}
		else{ //calendar.cmonth < currentmonth
			calendar.cmonth = currentmonth;
			calendar.cyear = calendar.cyear - 1;
		}
	}
	
	fillCalendar();
}

function getMonthLastDay()
{
	var testDate = new Date(calendar.cyear, calendar.cmonth-1, 29);
	if (testDate.getDate() == 29)
	{
		testDate.setDate(30);
		if (testDate.getDate() == 30)
		{
			testDate.setDate(31);
			if (testDate.getDate() == 31)
			{
				return 31
			}
			else
			{
				return 30;displayCalendar('w0')
			}
		}
		else
		{
			return 29;
		}
	}
	else
	{
		return 28;
	}
}

function getStringWeekDay(index)
{
	return dayInWeek[index];
}

function getStringMonth(index)
{
	return monthInYear[index - 1];
}