/**
 * jCalendar 0.5
 *
 * Some code based on jQuery Date Picker (http://kelvinluck.com/assets/jquery/datePicker/)
 *
 * Copyright (c) 2007 Theodore Serbinski (http://tedserbinski.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */
jQuery.jcalendar = function () {
	//var months = ['Январь', 'Февраль', 'Март', 'Апрель', 'Май', 'Июнь', 'Июль', 'Август', 'Сентябрь', 'Октябрь', 'Ноябрь', 'Декабрь'];
	var months = ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
	//var days = ['S', 'M', 'Tu', 'W', 'Th', 'F', 'S'];
	var days = ['вс', 'пн', 'вт', 'ср', 'чт', 'пт', 'сб'];
	var navLinks = {
		p: 'Prev',
		n: 'Next',
		t: 'Today'
	};
	var _firstDayOfWeek;
	var _firstDate;
	var _lastDate;
	var _selectedDate;

	var _drawCalendar = function (dateIn, a, day, month, year, s0lar_uri) {
		var today = new Date();
		var d;

		if (dateIn == undefined) {
			// start from this month.
			d = new Date(today.getFullYear(), today.getMonth(), 1);
			year.val(today.getFullYear());
			month.val(today.getMonth() + 1);
			day.val(today.getDate());
		}
		else {
			// start from the passed in date
			d = dateIn;
			d.setDate(1);
		}

		// check that date is within allowed limits
		if ((d.getMonth() < _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear()) || d.getFullYear() < _firstDate.getFullYear()) {
			d = new Date(_firstDate.getFullYear(), _firstDate.getMonth(), 1);
		}
		else if ((d.getMonth() > _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear()) || d.getFullYear() > _lastDate.getFullYear()) {
			d = new Date(_lastDate.getFullYear(), _lastDate.getMonth(), 1);
		}

		var firstMonth = true;
		var firstDate = _firstDate.getDate();

		// create prev and next links
		if (!(d.getMonth() == _firstDate.getMonth() && d.getFullYear() == _firstDate.getFullYear())) {
			// not in first display month so show a previous link
			firstMonth = false;
			var lastMonth = d.getMonth() == 0 ? new Date(d.getFullYear() - 1, 11, 1) : new Date(d.getFullYear(), d.getMonth() - 1, 1);
			var prevLink = jQuery('<a href="" class="link-prev">&lsaquo; ' + navLinks.p + '</a>').click(function () {
				jQuery.jcalendar.changeMonth(lastMonth, this, day, month, year);
				return false;
			});
		}

		var finalMonth = true;
		var lastDate = _lastDate.getDate();

		if (!(d.getMonth() == _lastDate.getMonth() && d.getFullYear() == _lastDate.getFullYear())) {
			// in the last month - no next link
			finalMonth = false;
			var nextMonth = new Date(d.getFullYear(), d.getMonth() + 1, 1);
			var nextLink = jQuery('<a href="" class="link-next">' + navLinks.n + ' &rsaquo;</a>').click(function () {
				jQuery.jcalendar.changeMonth(nextMonth, this, day, month, year);
				return false;
			});
		}

		var todayLink = jQuery('<a href="" class="link-today">' + navLinks.t + '</a>').click(function () {
			day.val(today.getDate());
			jQuery.jcalendar.changeMonth(today, this, day, month, year);
			return false;
		});

		// update the year and month select boxes
		year.val(d.getFullYear());
		month.val(d.getMonth() + 1);

		var headRow = jQuery("<tr></tr>");
		for (var i = _firstDayOfWeek; i < _firstDayOfWeek + 7; i++) {
			var weekday = i % 7;
			var wordday = days[weekday];
			headRow.append('<th scope="col" abbr="' + wordday + '" title="' + wordday + '" class="' + (weekday == 0 || weekday == 6 ? 'weekend' : 'weekday') + '">' + wordday + '</th>');
		}
		headRow = jQuery("<thead></thead>").append(headRow);

		var tBody = jQuery("<tbody></tbody>");
		var lastDay = (new Date(d.getFullYear(), d.getMonth() + 1, 0)).getDate();
		var curDay = _firstDayOfWeek - d.getDay();
		if (curDay > 0) curDay -= 7;

		var todayDate = today.getDate();
		var thisMonth = d.getMonth() == today.getMonth() && d.getFullYear() == today.getFullYear();

		// render calendar
		do {
			var thisRow = jQuery("<tr></tr>");
			for (var i = 0; i < 7; i++) {
				var weekday = (_firstDayOfWeek + i) % 7;
				var atts = {
					'class': (weekday == 0 || weekday == 6 ? 'weekend ' : 'weekday ')
				};

				if (curDay < 0 || curDay >= lastDay) {
					dayStr = ' ';
				}
				else if (firstMonth && curDay < firstDate - 1) {
					dayStr = curDay + 1;
					atts['class'] += 'inactive';
				}
				else if (finalMonth && curDay > lastDate - 1) {
					dayStr = curDay + 1;
					atts['class'] += 'inactive';
				}
				else {
					d.setDate(curDay + 1);

					// attach a click handler to every day to select it if clicked
					// we use the rel attribute to keep track of the day that is being clicked
					//s0lar
					//day, month, year
					if ((curDay + 1) < 10) var s0lar_d = '0' + (curDay + 1);
					else var s0lar_d = (curDay + 1);
					//
					var __mDay = month.val();
					if (__mDay < 10) var s0lar_m = '0' + __mDay;
					else var s0lar_m = __mDay;

					if(year.val() > 0) s0lar_y = year.val();
					else var s0lar_y = today.getFullYear();
					
					dayStr = jQuery('<a href="'+s0lar_uri+'date-' + s0lar_d + '_' + s0lar_m + '_' + s0lar_y + '/" rel="' + d + '">' + (curDay + 1) + '</a>').click(function (e) {
						if (_selectedDate) {
							_selectedDate.removeClass('selected');
						}
						_selectedDate = jQuery(this);
						//_selectedDate.addClass('selected');
						day.val(new Date(_selectedDate.attr('rel')).getDate());
						//return false;
					}); 

					// highlight the current selected day
					if (day.val() == d.getDate()) {
						_selectedDate = dayStr;
						_selectedDate.addClass('selected');
					}
				}

				if (thisMonth && curDay + 1 == todayDate) {
					atts['class'] += 'today';
				}
				thisRow.append(jQuery("<td></td>").attr(atts).append(dayStr));
				curDay++;
			}

			tBody.append(thisRow);
		} while (curDay < lastDay);

		jQuery('div.jcalendar').html('<table cellspacing="1"></table><div class="jcalendar-links"></div>');
		jQuery('div.jcalendar table').append(headRow, tBody);
		jQuery('div.jcalendar > div.jcalendar-links').append(prevLink, todayLink, nextLink);
	};

	return {
		show: function (a, day, month, year, s0lar_uri) {
			_firstDate = a._startDate;
			_lastDate = a._endDate;
			_firstDayOfWeek = 1;

			// pass in the selected form date if one was set
			var selected;
			if (year.val() > 0 && month.val() > 0/*  && day.val() > 0 */) {
				selected = new Date(year.val(), month.val() - 1, day.val());
			}
			else {
				selected = null;
			}
			_drawCalendar(selected, a, day, month, year, s0lar_uri);
		},
		changeMonth: function (d, e, day, month, year, s0lar_uri) {
			_drawCalendar(d, e, day, month, year, s0lar_uri);
		},
		/**
		 * Function: setLanguageStrings
		 *
		 * Allows you to localise the calendar by passing in relevant text for the english strings in the plugin.
		 *
		 * Arguments:
		 * days		-	Array, e.g. ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
		 * months	-	Array, e.g. ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
		 * navLinks	-	Object, e.g. {p:'Prev', n:'Next', c:'Close', b:'Choose date'}
		 **/
		setLanguageStrings: function (aDays, aMonths, aNavLinks) {
			days = aDays;
			months = aMonths;
			navLinks = aNavLinks;
		},
		/**
		 * Function: setDateWindow
		 *
		 * Used internally to set the start and end dates for a given date select
		 *
		 * Arguments:
		 * i			-	The id of the INPUT element this date window is for
		 * w			-	The date window - an object containing startDate and endDate properties
		 *				e.g. {startDate:'24-11-1981', endDate:'25-12-2012}
		 **/
		setDateWindow: function (i, w, year) {
			if (w == undefined) w = {};
			if (w.startDate == undefined) {
				// set the minimum browseable date equal to January of the min year in the select box
				// don't get the first option because that is an empty year
				// note we can't do this: year.find('option:eq(1)').val()
				// it doesn't work in 1.0 since find() is destructive
				// so we copy the object to a new var
				i._startDate = new Date($(year).find('option:eq(1)').val(), 0, 1);
			}
			else {
				dateParts = w.startDate.split('-');
				i._startDate = new Date(dateParts[2], Number(dateParts[1]) - 1, Number(dateParts[0]));
			}
			if (w.endDate == undefined) {
				// set the maximum browseable date equal to December of the max year in the select box
				// note we can't do this: year.find('option:last').val()
				// it doesn't work in 1.0 since find() is destructive
				// so we copy the object to a new var
				i._endDate = new Date($(year).find('option:last').val(), 11, 1);
			}
			else {
				dateParts = w.endDate.split('-');
				i._endDate = new Date(dateParts[2], Number(dateParts[1]) - 1, Number(dateParts[0]));
			}
			i._firstDayOfWeek = w.firstDayOfWeek == undefined ? 0 : w.firstDayOfWeek;
		}
	};
}();

jQuery.fn.jcalendar = function (a) {
	var s0lar_uri = a.s0lar_uri;
	this.each(function () {
		var day = $(this).find('select.jcalendar-select-day');
		var month = $(this).find('select.jcalendar-select-month');
		var year = $(this).find('select.jcalendar-select-year');
		
		
		$('div.jcalendar-selects').after('<div class="jcalendar"></div>');
		jQuery.jcalendar.setDateWindow(this, a, year);
		jQuery.jcalendar.show(this, day, month, year, s0lar_uri);

		day.change(function () {
			// only if a valid day is selected
			if (this.value > 0) {
				d = new Date(year.val(), month.val() - 1, this.value);
				jQuery.jcalendar.changeMonth(d, a, day, month, year, s0lar_uri);
			}
		});

		month.change(function () {
			// only if a valid month is selected
			if (this.value > 0) {
				d = new Date(year.val(), this.value - 1, 1);
				jQuery.jcalendar.changeMonth(d, a, day, month, year, s0lar_uri);
			}
		});

		year.change(function () {
			// only if a valid year is selected
			if (this.value > 0) {
				d = new Date(this.value, month.val() - 1, 1);
				jQuery.jcalendar.changeMonth(d, a, day, month, year, s0lar_uri);
			}
		});

	});
	return this;
};