var day;
var month;
var year;
var hour;
var minute;
var second;
var clock_set = 0;

var month_names = new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
var day_names = new Array("Sun","Mon","Tue","Wed","Thu","Fri","Sat");
var submit_text = "Go";

/**
* Formats number to two digits.
*
* @param   int number to format.
* @param   string type of number
*/
function formatNum2(i, valtype) {
		f = (i < 10 ? '0' : '') + i;
		if (valtype && valtype != '') {
				switch(valtype) {
						case 'month':
								f = (f > 12 ? 12 : f);
								break;

						case 'day':
								f = (f > 31 ? 31 : f);
								break;

						case 'hour':
								f = (f > 24 ? 24 : f);
								break;

						default:
						case 'second':
						case 'minute':
								f = (f > 59 ? 59 : f);
								break;
				}
		}

		return f;
}

/**
* Formats number to two digits.
*
* @param   int number to format.
* @param   int default value
* @param   string type of number
*/
function formatNum2d(i, default_v, valtype) {
		i = parseInt(i, 10);
		if (isNaN(i)) return default_v;
		return formatNum2(i, valtype)
}

/**
* Formats number to four digits.
*
* @param   int number to format.
*/
function formatNum4(i) {
		i = parseInt(i, 10)
		return (i < 1000 ? i < 100 ? i < 10 ? '000' : '00' : '0' : '') + i;
}

/**
* Initializes calendar window.
*/
function initCalendar() {
		if (!year && !month && !day) {
				/* Called for first time */
				if (document.CalendarForm.date_field.value) {
						value = document.CalendarForm.date_field.value;
						if (document.CalendarForm.date_type.value == 'datetime' || document.CalendarForm.date_type.value == 'date') {
								if (document.CalendarForm.date_type.value == 'datetime') {
										parts   = value.split(' ');
										value   = parts[0];

										if (parts[1]) {
												time    = parts[1].split(':');
												hour    = parseInt(time[0],10);
												minute  = parseInt(time[1],10);
												second  = parseInt(time[2],10);
										}
								}
								date        = value.split("-");
								day         = parseInt(date[2],10);
								month       = parseInt(date[1],10) - 1;
								year        = parseInt(date[0],10);
						} else {
								year        = parseInt(value.substr(0,4),10);
								month       = parseInt(value.substr(4,2),10) - 1;
								day         = parseInt(value.substr(6,2),10);
								hour        = parseInt(value.substr(8,2),10);
								minute      = parseInt(value.substr(10,2),10);
								second      = parseInt(value.substr(12,2),10);
						}
				}
				if (isNaN(year) || isNaN(month) || isNaN(day) || day == 0) {
						dt      = new Date();
						year    = dt.getFullYear();
						month   = dt.getMonth();
						day     = dt.getDate();
				}
				if (isNaN(hour) || isNaN(minute) || isNaN(second)) {
						dt      = new Date();
						hour    = dt.getHours();
						minute  = dt.getMinutes();
						second  = dt.getSeconds();
				}
		} else {
				/* Moving in calendar */
				if (month > 11) {
						month = 0;
						year++;
				}
				if (month < 0) {
						month = 11;
						year--;
				}
		}

		if (document.getElementById) {
				cnt = document.getElementById("calendar_data");
		} else if (document.all) {
				cnt = document.all["calendar_data"];
		}

		cnt.innerHTML = "";

		str = ""

		//heading table
		str += '<table class="calendar" align="center"><tr><th width="50%">';
		str += '<form method="NONE" onsubmit="return 0">';
		str += '<a href="javascript:month--; initCalendar();">&laquo;</a> ';
		str += '<select id="select_month" name="monthsel" onchange="month = parseInt(document.getElementById(\'select_month\').value); initCalendar();" class="InputTextResizable" onfocus="this.className=\'InputTextResizableFocus\'" onblur="this.className=\'InputTextResizable\'">';
		for (i =0; i < 12; i++) {
				if (i == month) selected = ' selected="selected"';
				else selected = '';
				str += '<option value="' + i + '" ' + selected + '>' + month_names[i] + '</option>';
		}
		str += '</select>';
		str += ' <a href="javascript:month++; initCalendar();">&raquo;</a>';
		str += '</form>';
		str += '</th><th width="50%">';
		str += '<form method="NONE" onsubmit="return 0">';
		str += '<a href="javascript:year--; initCalendar();">&laquo;</a> ';
		str += '<select id="select_year" name="yearsel" onchange="year = parseInt(document.getElementById(\'select_year\').value); initCalendar();" class="InputTextResizable" onfocus="this.className=\'InputTextResizableFocus\'" onblur="this.className=\'InputTextResizable\'">';
		for (i = year - 25; i < year + 25; i++) {
				if (i == year) selected = ' selected="selected"';
				else selected = '';
				str += '<option value="' + i + '" ' + selected + '>' + i + '</option>';
		}
		str += '</select>';
		str += ' <a href="javascript:year++; initCalendar();">&raquo;</a>';
		str += '</form>';
		str += '</th></tr></table>';

		str += '<table class="calendar" align="center"><tr>';
		for (i = 0; i < 7; i++) {
				str += "<th>" + day_names[i] + "</th>";
		}
		str += "</tr>";

		var firstDay = new Date(year, month, 1).getDay();
		var lastDay = new Date(year, month + 1, 0).getDate();

		str += "<tr>";

		dayInWeek = 0;
		for (i = 0; i < firstDay; i++) {
				str += "<td>&nbsp;</td>";
				dayInWeek++;
		}
		for (i = 1; i <= lastDay; i++) {
				if (dayInWeek == 7) {
						str += "</tr><tr>";
						dayInWeek = 0;
				}

				dispmonth = 1 + month;

				if (document.CalendarForm.date_type.value == 'datetime' || document.CalendarForm.date_type.value == 'date') {
					actVal = "" + formatNum4(year) + "-" + formatNum2(dispmonth, 'month') + "-" + formatNum2(i, 'day');
				} else {
					actVal = "" + formatNum4(year) + formatNum2(dispmonth, 'month') + formatNum2(i, 'day');
				}

				if (i == day) {
					style = ' class="selected"';
					current_date = actVal;
				} else {
					style = '';
				}
				str += "<td" + style + "><a href=\"javascript:returnDate('" + actVal + "');\">" + i + "</a></td>"
				dayInWeek++;
		}
		for (i = dayInWeek; i < 7; i++) {
				str += "<td>&nbsp;</td>";
		}

		str += "</tr></table>";

		cnt.innerHTML = str;

		// Should we handle time also?
		if (document.CalendarForm.date_type.value == 'datetime') {

				if (document.getElementById) {
						cnt = document.getElementById("clock_data");
				} else if (document.all) {
						cnt = document.all["clock_data"];
				}

				str = '';
				init_hour = hour;
				init_minute = minute;
				init_second = second;
				str += '<form method="NONE" class="clock" onsubmit="returnDate(\'' + current_date + '\')">';
				str += '<input id="hour"    type="text" size="2" maxlength="2" onblur="this.value=formatNum2d(this.value, init_hour, \'hour\'); init_hour = this.value; this.className=\'InputTextResizable\'" value="' + formatNum2(hour, 'hour') + '" class="InputTextResizable" onfocus="this.className=\'InputTextResizableFocus\'" />:';
				str += '<input id="minute"  type="text" size="2" maxlength="2" onblur="this.value=formatNum2d(this.value, init_minute, \'minute\'); init_minute = this.value; this.className=\'InputTextResizable\'" value="' + formatNum2(minute, 'minute') + '" class="InputTextResizable" onfocus="this.className=\'InputTextResizableFocus\'" />:';
				str += '<input id="second"  type="text" size="2" maxlength="2" onblur="this.value=formatNum2d(this.value, init_second, \'second\'); init_second = this.value; this.className=\'InputTextResizable\';" value="' + formatNum2(second, 'second') + '" class="InputTextResizable" onfocus="this.className=\'InputTextResizableFocus\'" />';
				//str += '<br />';
				//str += '<input type="submit" value="' + submit_text + '"/>';
				str += '</form>';

				cnt.innerHTML = str;
		}

}

/**
* Returns date from calendar.
*
* @param   string     date text
*/
function returnDate(d) {
		txt = d;
		if (document.CalendarForm.date_type.value == 'datetime') {
				// need to get time
				h = parseInt(document.getElementById('hour').value,10);
				m = parseInt(document.getElementById('minute').value,10);
				s = parseInt(document.getElementById('second').value,10);
				if (document.CalendarForm.date_type.value == 'datetime') {
						txt += ' ' + formatNum2(h, 'hour') + ':' + formatNum2(m, 'minute') + ':' + formatNum2(s, 'second');
				} else {
						// timestamp
						txt += formatNum2(h, 'hour') + formatNum2(m, 'minute') + formatNum2(s, 'second');
				}
		}

		document.CalendarForm.date_field.value = txt;
		document.CalendarForm.submit();
}