// Set the initial date.
var ds_i_date = new Date();
ds_c_month = ds_i_date.getMonth() + 1;
ds_c_year = ds_i_date.getFullYear();

// Get Element By Id
function ds_getel(id) {
	return document.getElementById(id);
}

// Get the left and the top of the element.
function ds_getleft(el) {
	var tmp = el.offsetLeft;
	el = el.offsetParent
	while(el) {
		tmp += el.offsetLeft;
		el = el.offsetParent;
	}
	return tmp;
}
function ds_gettop(el) {
	var tmp = el.offsetTop;
	el = el.offsetParent
	while(el) {
		tmp += el.offsetTop;
		el = el.offsetParent;
	}
	return tmp;
}

// Output Element
var ds_oe = ds_getel('ds_calclass');
// Container
var ds_ce = ds_getel('ds_conclass');

// Output Buffering
var ds_ob = ''; 
function ds_ob_clean() {
	ds_ob = '';
}
function ds_ob_flush() {
	ds_oe.innerHTML = ds_ob;
	ds_ob_clean();
}
function ds_echo(t) {
	ds_ob += t;
}

var ds_element; // Text Element...

var ds_monthnames = [
'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
]; // You can translate it for your language.

var ds_daynames = [
'M', 'T', 'W', 'T', 'F', 'S', 'S'
]; // You can translate it for your language.

// Calendar template
function ds_template_main_above(t,showPrev,caltype) {
	var output = '<table cellpadding="1" cellspacing="1" class="ds_tbl">'
	     + '<tr>';
	if(showPrev) {
		output += '<td class="ds_headbuttons" onclick="ds_pm(\'' + caltype + '\');">&lt;</td>';
	}
	else {
		output += '<td class="ds_head"></td>';
	}
	
	output += '<td class="ds_head" colspan="5">' + t + '</td>'
		+ '<td class="ds_headbuttons" onclick="ds_nm(\'' + caltype + '\');">&gt;</td>'
		+ '</tr>'
		+ '<tr>';
		
	return output;
}

function ds_template_day_row(t) {
	return '<td class="ds_subhead">' + t + '</td>';
	// Define width in CSS, XHTML 1.0 Strict doesn't have width property for it.
}

function ds_template_new_week() {
	return '</tr><tr>';
}

function ds_template_blank_cell(colspan) {
	return '<td colspan="' + colspan + '"></td>'
}

function ds_template_day(d, m, y, beforetoday, greyday) {	
	if(beforetoday) {
		var output = '<td class="ds_cell_ghosted">' + d + '</td>';
	}
	else if(!greyday) {
		var output = '<td class="ds_cell" onclick="ds_onclick(' + parseInt(d,10) + ',' + parseInt(m,10) + ',' + y + ')">' + d + '</td>';
	}
	else {
		var output = '<td class="ds_cell_grey" onclick="ds_onclick(' + parseInt(d,10) + ',' + parseInt(m,10) + ',' + y + ')">' + d + '</td>';
	}
	return output;
	// Define width the day row.
}

function ds_template_main_below() {
	return '</tr>'
	     + '</table>';
}

// This one draws calendar...
function ds_draw_calendar(m, y, caltype) {
	// First clean the output buffer.
	ds_ob_clean();

	// Here we go, do the header
	var today = new Date();

	var showPrev = true;
	if(today.getMonth() == m-1 && today.getFullYear() == y) {
		showPrev = false;
	}
		
	ds_echo (ds_template_main_above(ds_monthnames[m - 1] + ' ' + y,showPrev,caltype));
	for (i = 0; i < 7; i ++) {
		ds_echo (ds_template_day_row(ds_daynames[i]));
	}
	// Make a date object.
	var ds_dc_date = new Date();
	ds_dc_date.setMonth(m - 1);
	ds_dc_date.setFullYear(y);
	ds_dc_date.setDate(1);
	if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) {
		days = 31;
	} else if (m == 4 || m == 6 || m == 9 || m == 11) {
		days = 30;
	} else {
		days = (y % 4 == 0) ? 29 : 28;
	}
	var first_day = ds_dc_date.getDay();
	var first_loop = 1;
	// Start the first week
	ds_echo (ds_template_new_week());
	// If monday is not the first day of the month, make a blank cell...
	if (first_day == 0) {
		ds_echo (ds_template_blank_cell(6));
	}
	else if(first_day != 1) {
		ds_echo (ds_template_blank_cell(first_day-1));
	}
	var j = first_day;
	for (i = 0; i < days; i ++) {
		// Today is monday, make a new week.
		// If this monday is the first day of the month,
		// we've made a new row for you already.
		if (j == 1 && !first_loop) {
			// New week!!
			ds_echo (ds_template_new_week());
		}
		// Make a row of that day!
		var beforetoday = false;
		if(i+1 < today.getDate() && m-1 == today.getMonth() && y == today.getFullYear()) {
			beforetoday = true;
		}

		if(caltype=="arrivaldate") {
			var greydate = document.getElementById('arrivaldate').value;
		}
		else {
			var greydate = document.getElementById('departuredate').value;
		}

		var greyday = false;
		var greydatesplit = greydate.split("/");
		if(!isNaN(parseInt(greydatesplit[0],10)) && !isNaN(parseInt(greydatesplit[1],10)) && !isNaN(parseInt(greydatesplit[2],10))) {
			if((i + 1) == parseInt(greydatesplit[0],10) && m == parseInt(greydatesplit[1],10) && y == greydatesplit[2]) {
				greyday = true;
			}
		}
		
		ds_echo (ds_template_day(i + 1, m, y, beforetoday, greyday));
		// This is not first loop anymore...
		first_loop = 0;
		// What is the next day?
		j ++;
		j %= 7;
	}
	
	ds_echo('<tr><td colspan="7" class="ds_foot" onclick="ds_hi();">Close</td></tr>');
	// Do the footer
	ds_echo (ds_template_main_below());
	// And let's display..
	ds_ob_flush();
	// Scroll it into view.
	//ds_ce.scrollIntoView();
}

// A function to show the calendar.
// When user click on the date, it will set the content of t.
function ds_sh(t,caltype) {
	document.getElementById('numadults').style.visibility = "hidden";
	document.getElementById('numchildren').style.visibility = "hidden";

	// Set the element to set...
	ds_element = t;
	
	// Make a new date, and set the current month and year.
	var arrivaldate = document.getElementById('arrivaldate').value;
	var departuredate = document.getElementById('departuredate').value;
	var ds_sh_date = new Date();
	ds_c_month = ds_sh_date.getMonth() + 1;
	ds_c_year = ds_sh_date.getFullYear();
	
	
	var arrivaldatesplit = arrivaldate.split("-");
	var departuredatesplit = departuredate.split("-");
	var arrivaldateset = false;
	var departuredateset = false;
	
	if(arrivaldatesplit.length==3) {
		if(!isNaN(parseInt(arrivaldatesplit[0],10)) && !isNaN(parseInt(arrivaldatesplit[2],10))) {
			arrivaldateset = true;
		}
	}
	if(departuredatesplit.length=3) {
		if(!isNaN(parseInt(departuredatesplit[0],10)) && !isNaN(parseInt(departuredatesplit[2],10))) {
			departuredateset = true;
		}
	}
	
	if(caltype=="arrivaldate" || departuredateset==false) {
		if(arrivaldateset) {
			month = arrivaldatesplit[1];
			ds_c_month = ds_monthnames.indexOf(month) + 1;
			ds_c_year = arrivaldatesplit[2];
		}
	}
	else if(caltype=="departuredate" && departuredateset==true) {
		month = departuredatesplit[1];
		ds_c_month = ds_monthnames.indexOf(month) + 1;
		ds_c_year = departuredatesplit[2];
	}

	// Draw the calendar
	ds_draw_calendar(ds_c_month, ds_c_year, caltype);
	// To change the position properly, we must show it first.
	ds_ce.style.display = '';
	// Move the calendar container!
	the_left = ds_getleft(t) + 1;
	the_top = ds_gettop(t) + t.offsetHeight;
	ds_ce.style.left = the_left + 'px';
	ds_ce.style.top = the_top + 'px';
	// Scroll it into view.
	//ds_ce.scrollIntoView();
}

// Hide the calendar.
function ds_hi() {
	ds_ce.style.display = 'none';
	document.getElementById('numadults').style.visibility = "visible";
	document.getElementById('numchildren').style.visibility = "visible";
}

// Moves to the next month...
function ds_nm(caltype) {
	// Increase the current month.
	ds_c_month ++;
	// We have passed December, let's go to the next year.
	// Increase the current year, and set the current month to January.
	if (ds_c_month > 12) {
		ds_c_month = 1; 
		ds_c_year++;
	}
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year, caltype);
}

// Moves to the previous month...
function ds_pm(caltype) {
	ds_c_month = ds_c_month - 1; // Can't use dash-dash here, it will make the page invalid.
	// We have passed January, let's go back to the previous year.
	// Decrease the current year, and set the current month to December.
	if (ds_c_month < 1) {
		ds_c_month = 12; 
		ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
	}
	// Redraw the calendar.
	ds_draw_calendar(ds_c_month, ds_c_year, caltype);
}

// Format the date to output.
function ds_format_date(d, m, y) {	
	// 2 digits month.
	// m2 = '00' + m;
	// m2 = m2.substr(m2.length - 2);
	// 2 digits day.
	d2 = '00' + d;
	d2 = d2.substr(d2.length - 2);
	// DD-MM-YYYY
	return d2 + '-' + ds_monthnames[m-1] + '-' + y;
}

// When the user clicks the day.
function ds_onclick(d, m, y) {
	// Hide the calendar.
	ds_hi();
	// Set the value of it, if we can.
	if (typeof(ds_element.value) != 'undefined') {
		ds_element.value = ds_format_date(d, m, y);
	// Maybe we want to set the HTML in it.
	} else if (typeof(ds_element.innerHTML) != 'undefined') {
		ds_element.innerHTML = ds_format_date(d, m, y);
	// I don't know how should we display it, just alert it to user.
	} else {
		alert (ds_format_date(d, m, y));
	}
	showUpdateButton(true);
}

if (!Array.prototype.indexOf){
	Array.prototype.indexOf = function(obj){
		var len = this.length;
		for (var i = 0; i < len; i++) {
		  if(this[i]==obj) { return i; }
		}
		return false;
  };
}