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

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

fcp.week_days = ["Пн", "Вт", "Ср", "Чт", "Пн", "Сб", "Вс"];
fcp.months = ["январь", "февраль", "март", "апрель", "май", "июнь", "июль", "август", "сентябрь", "октябрь", "ноябрь", "декабрь"];
fcp.msg.prev_year = "предыдущий год";
fcp.msg.prev_month = "предыдущий месяц";
fcp.msg.next_month = "следующий месяц";
fcp.msg.next_year = "следующий год";

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

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.next_year = function ()
{
	var is_feb29 = (this.selection.getMonth() == 1) && (this.selection.getDate() == 29);
	if (is_feb29)
	{
		this.selection.setDate(1);
		this.selection.setMonth(2); // March
	}
	this.selection.setFullYear(this.selection.getFullYear() + 1);
	this.generate_month();
	this.render_calendar();
}

fcp.Calendar.prototype.prev_year = function ()
{
	var is_feb29 = (this.selection.getMonth() == 1)&& (this.selection.getDate() == 29);
	if (is_feb29)
	{
		this.selection.setDate(1);
		this.selection.setMonth(2); // March
	}
	this.selection.setFullYear(this.selection.getFullYear() - 1);
	this.generate_month();
	this.render_calendar();
}

fcp.Calendar.prototype.month_select = function ()
{
	location.href = "/news/" + this.selection.getFullYear() + "/" + ( this.selection.getMonth() + 1 );
}

fcp.Calendar.prototype.year_select = function ()
{
	location.href = "/news/" + this.selection.getFullYear();
}


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();
	first_weekday = (first_weekday == 0) ? 6 : first_weekday - 1;
	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;
	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);
		}
	}

	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_year = document.createElement("a");
	prev_year.href = "#";
	prev_year.calendar = this;
	prev_year.onclick = function()
	{
		this.calendar.prev_year();
		return false;
	};
	prev_year.innerHTML = "&lt;&lt;";
	prev_year.title = fcp.msg.prev_year;

	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 curr_month = document.createElement("a");
	curr_month.href = "#";
	curr_month.calendar = this;
	curr_month.className = "curr_month";
	curr_month.onclick = function() {
		this.calendar.month_select();
		return false;
	};
	curr_month.innerHTML = fcp.months[this.selection.getMonth()];

	var curr_year = document.createElement("a");
	curr_year.href = "#";
	curr_year.calendar = this;
	curr_month.className = "curr_year";
	curr_year.onclick = function() {
		this.calendar.year_select();
		return false;
	};
	curr_year.innerHTML = this.selection.getFullYear();

	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;

	var next_year = document.createElement("a");
	next_year.href = "#";
	next_year.calendar = this;
	next_year.onclick = function() {
		this.calendar.next_year();
		return false;
	};
	next_year.innerHTML = "&gt;&gt;";
	next_year.title = fcp.msg.next_year;

	heading.appendChild(prev_year);
	heading.appendChild(document.createTextNode("\u00a0"));
	heading.appendChild(prev_month);
	heading.appendChild(document.createTextNode("\u00a0"));
	heading.appendChild(curr_month);
	heading.appendChild(document.createTextNode("\u00a0"));
	heading.appendChild(curr_year);
	heading.appendChild(document.createTextNode("\u00a0"));
	heading.appendChild(next_month);
	heading.appendChild(document.createTextNode("\u00a0"));
	heading.appendChild(next_year);
	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);
		if (day_number == this.selection.getDate())
		{
			this.selected_cell = td;
			td.className = "in_month selected";
		}
		else
		{
			td.className = "in_month";
		}
	}
	return td;
}

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 ()
{
	if (this.calendar.selected_cell)
		this.calendar.selected_cell.className = "in_month";
	this.calendar.selected_cell = this.parentNode;
	this.parentNode.className = "in_month selected";
	this.calendar.selection.setDate(this.date);
	this.calendar.onselect(this.calendar.selection);
	return false;
}

fcp.Calendar.month_year_select = function ()
{
	alert( this );
	return false;
}

addLoadEvent( function()
	{
		cal = new fcp.Calendar(document.getElementById("cal_placeholder"));
		cal.onselect = function(date) { location.href = "/news/" + date.getFullYear() + "/" + ( date.getMonth() + 1 ) + "/" + date.getDate(); };
	}
)