// fcp.Calendar - simple Calendar control for Javascript.
// Copyright (C) 2006 Felix Plesoianu
// This file is distributed under the MIT license.
// Customized for Niels Feijen by Frank Storck - http://www.frankstorck.nl/
// Last change (2006-09-06): current date can be highlighted.

window.onload = function() {
 cal = new fcp.Calendar(document.getElementById("cal_placeholder"));
 cal.onselect = function(t_day, t_month, t_year) {
		if(typeof(events[t_day+' '+fcp.months[t_month]+' '+t_year]) == "string") {
			document.getElementById("news_placeholder").innerHTML = 'Loading news, one moment please...';
			document.location.href='news.php?day='+t_day+'&month='+(t_month+1)+'&year='+t_year;
		} else {
			document.getElementById("news_placeholder").innerHTML = 'No news-items were posted on '+t_day+' '+fcp.months[(t_month)]+' '+t_year+'!';
		}
	}
}

if (!fcp)
	var fcp = new Object();
if (!fcp.msg)
	fcp.msg = new Object();

fcp.week_days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
fcp.months = ["January", "February", "March", "April", "May", "June",
	"July", "August", "September", "October", "November", "December"];
fcp.msg.prev_year = "Previous year";
fcp.msg.prev_month = "Previous month";
fcp.msg.next_month = "Next month";
fcp.msg.next_year = "Next year";

fcp.Calendar = function(element, show_clock) {
	if (!element.childNodes)
		throw "HTML element expected";
	this.element = element;
	this.selection = new Date(year,month,day);
	this.show_clock = show_clock;
	this.selected_cell = undefined;
	this.generate_month();
	this.render_calendar();
}

function correctYear() {
	if(year > 3000) {
		year = year-1900;
	} else if(year < 1901) {
		year = year+1900;
	}
}

fcp.Calendar.prototype.set_date_time = function (date_time) {
	if (date_time.constructor == Date) {
		this.selection = date_time;
		this.generate_month();
		this.render_calendar();
	} else {
		throw "Date object expected (in fcp.Calendar.set_date_time)";
	}
}

fcp.Calendar.prototype.next_month = function () {
	var month = this.selection.getMonth();
	if (month == 11) {
		this.selection.setMonth(0);
		this.selection.setYear(this.selection.getFullYear() + 1);
	} else {
		this.selection.setMonth(month + 1);
	}
	this.generate_month();
	this.render_calendar();
}

fcp.Calendar.prototype.prev_month = function () {
	var month = this.selection.getMonth();
	if (month == 0) {
		this.selection.setMonth(11);
		this.selection.setYear(this.selection.getFullYear() - 1);
	} else {
		this.selection.setMonth(month - 1);
	}
	this.generate_month();
	this.render_calendar();
}


fcp.Calendar.prototype.generate_month = function () {
	this.raw_data = new Array();
	var week = 0;
	this.raw_data[week] = new Array(7);
	
	var first_of_month = fcp.Calendar.clone_date(this.selection);
	first_of_month.setDate(1);
	var first_weekday = first_of_month.getDay();
	// Move Sunday last were it belongs, he he.
	first_weekday = (first_weekday == 0) ? 6 : first_weekday - 1;
	// Fill in the last days from the previous month.
	for (var i = 0; i < first_weekday; i++) {
		this.raw_data[week][i] = 0;
	}
	
	var last_of_month = fcp.Calendar.days_in_month(
		this.selection.getYear(),
		this.selection.getMonth());
	var weekday = first_weekday;
	
	month = this.selection.getMonth();
	year = this.selection.getYear();
	
	for (var i = 1; i <= last_of_month; i++) {
		this.raw_data[week][weekday] = i;
		weekday++;
		if (weekday > 6) {
			weekday = 0;
			week++;
			this.raw_data[week] = new Array(7);
		}
	}

	// Fill in the first days from the next month.
	for (var i = weekday; i < 7; i++) {
		this.raw_data[week][i] = 0;
	}
}

fcp.Calendar.prototype.render_calendar = function () {
	this.element.selected_cell = undefined;
	this.element.innerHTML = "";
	this.element.appendChild(this.render_month());
}

fcp.Calendar.prototype.render_heading = function () {
	var heading = document.createElement("caption");
		
	var prev_month = document.createElement("a");
	prev_month.href = "#";
	prev_month.calendar = this;
	prev_month.onclick = function() {
		this.calendar.prev_month();
		return false;
	};
	prev_month.innerHTML = "&lt;";
	prev_month.title = fcp.msg.prev_month;
	
	var month_year = document.createElement("span");
	month_year.innerHTML = "\u00a0\u00a0" + fcp.months[this.selection.getMonth()] + " " + this.selection.getFullYear() + "\u00a0\u00a0";
	month_year.className = "title";
		
	var next_month = document.createElement("a");
	next_month.href = "#";
	next_month.calendar = this;
	next_month.onclick = function() {
		this.calendar.next_month();
		return false;
	};
	next_month.innerHTML = "&gt;";
	next_month.title = fcp.msg.next_month;

	heading.appendChild(prev_month);
	heading.appendChild(month_year);
	heading.appendChild(next_month);
	return heading;
}

fcp.Calendar.prototype.render_month = function() {
	var html_month = document.createElement("table");
	html_month.className = "calendar";
	html_month.appendChild(this.render_heading());
	
	var thead = document.createElement("thead");
	var tr = document.createElement("tr");
	for (var i = 0; i < fcp.week_days.length; i++) {
		var th = document.createElement("th");
		th.innerHTML =  fcp.week_days[i];
		tr.appendChild(th);
	}
	thead.appendChild(tr);
	html_month.appendChild(thead);
	
	var tbody = document.createElement("tbody");
	for (var i = 0; i < this.raw_data.length; i++) {
		tbody.appendChild(this.render_week(this.raw_data[i]));
	}
	html_month.appendChild(tbody);
	return html_month;
}

fcp.Calendar.prototype.render_week = function (day_numbers) {
	var html_week = document.createElement("tr");
	html_week.align = "right";
	for (var i = 0; i < 7; i++) {
		html_week.appendChild(this.render_day(day_numbers[i]));
	}
	return html_week;
}


fcp.Calendar.prototype.render_day = function (day_number) {
	var td = document.createElement("td");
	if (day_number >= 1 && day_number <= 31) {
		var anchor = document.createElement("a");
		anchor.href = "#";
		anchor.innerHTML = day_number;
		anchor.calendar = this;
		anchor.date = day_number;
		anchor.onclick = fcp.Calendar.handle_select;
		td.appendChild(anchor);
		
		correctYear();
		
		if (day_number == this.selection.getDate()) {
			this.selected_cell = td;
			if(typeof(events[day_number+' '+fcp.months[month]+' '+(year)]) == "string") {
				td.className = "in_month selected event";
			} else {
				td.className = "in_month selected";
			}
			day = day_number;
		} else {
			if(typeof(events[day_number+' '+fcp.months[month]+' '+(year)]) == "string") {
				td.className = "in_month event";
			} else {
				td.className = "in_month";
			}
		}

	}
	return td;
}

// Do nothing by default.
fcp.Calendar.prototype.onselect = function () {}

fcp.Calendar.clone_date = function (date_obj) {
	if (date_obj.constructor != Date)
		throw "Date object expected (in fcp.Calendar.clone_date)";
	else
		return new Date(
			date_obj.getFullYear(),
			date_obj.getMonth(),
			date_obj.getDate(),
			date_obj.getHours(),
			date_obj.getMinutes(),
			date_obj.getSeconds());	
}

fcp.Calendar.days_in_month = function (year, month) {
	if (month < 0 || month > 11)
		throw "Month must be between 0 and 11";
	var day_count = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
	if (month != 1) {
		return day_count[month];
	} else if ((year % 4) != 0) {
		return 28;
	} else if ((year % 400) == 0) {
		return 29;
	} else if ((year % 100) == 0) {
		return 28;
	} else {
		return 29;
	}
}

fcp.Calendar.handle_select = function () {
	correctYear();
	
	if (this.calendar.selected_cell) {
		this.calendar.selected_cell.className = "in_month";
	}
	
	if(typeof(events[day+' '+fcp.months[month]+' '+(year)]) == "string") {
		this.calendar.selected_cell.className = "event";
	}
	
	this.calendar.selected_cell = this.parentNode;
	this.parentNode.className = "in_month selected"; 



	this.calendar.selection.setDate(this.date);
	this.calendar.onselect(this.date, month, year);
	
	day = this.date;
	return false;
}