(function($) {

	function calendarWidget(el, params) {

		var now   = new Date();
		var thismonth = now.getMonth();
		var thisyear  = now.getYear() + 1900;

		var opts = {
			month: thismonth,
			year: thisyear
		};

		$.extend(opts, params);

		var monthNames = ['Janeiro', 'Fevereiro', 'Março', 'Abril', 'Maio', 'Junho', 'Julho', 'Agosto', 'Setembro', 'Outubro', 'Novembro', 'Dezembro'];
		var dayNames = ['D', 'S', 'T', 'Q', 'Q', 'S', 'S'];
		month = i = parseInt(opts.month);
		year = parseInt(opts.year);
		var m = 0;
		var table = '';

		// next month
		if (month == 11) {
			var next_month = '<a href="?month=' + 1 + '&amp;year=' + (year + 1) + '" title="' + monthNames[0] + ' ' + (year + 1) + '">' + monthNames[0] + ' ' + (year + 1) + '</a>';
		} else {
			var next_month = '<a href="?month=' + (month + 2) + '&amp;year=' + (year) + '" title="' + monthNames[month + 1] + ' ' + (year) + '">' + monthNames[month + 1] + ' ' + (year) + '</a>';
		}

		// previous month
		if (month == 0) {
			var prev_month = '<a href="?month=' + 12 + '&amp;year=' + (year - 1) + '" title="' + monthNames[11] + ' ' + (year - 1) + '">' + monthNames[11] + ' ' + (year - 1) + '</a>';
		} else {
			var prev_month = '<a href="?month=' + (month) + '&amp;year=' + (year) + '" title="' + monthNames[month - 1] + ' ' + (year) + '">' + monthNames[month - 1] + ' ' + (year) + '</a>';
		}

		table += ('<h4 id="current-month">'+monthNames[month]+' - '+year+'</h4>');
		// uncomment the following lines if you'd like to display calendar month based on 'month' and 'view' paramaters from the URL
		//table += ('<div class="nav-prev">'+ prev_month +'</div>');
		//table += ('<div class="nav-next">'+ next_month +'</div>');
		table += ('<table class="calendar-month " ' +'id="calendar-month'+i+' " cellspacing="0">');

		table += '<tr>';

		for (d=0; d<7; d++) {
			table += '<th class="weekday">' + dayNames[d] + '</th>';
		}

		table += '</tr>';

		var days = getDaysInMonth(month,year);
		var firstDayDate=new Date(year,month,1);
		var firstDay=firstDayDate.getDay();

		var prev_days = getDaysInMonth(month,year);
		var firstDayDate=new Date(year,month,1);
		var firstDay=firstDayDate.getDay();

		var prev_m = month == 0 ? 11 : month-1;
		var prev_y = prev_m == 11 ? year - 1 : year;
		var prev_days = getDaysInMonth(prev_m, prev_y);
		firstDay = (firstDay == 0 && firstDayDate) ? 7 : firstDay;

		var i = 0;
		for (j=0;j<42;j++){

			if ((j<firstDay)){
				table += ('<td class="other-month"><span class="day">'+ dc(prev_days-firstDay+j+1) +'</span></td>');
			} else if ((j>=firstDay+getDaysInMonth(month,year))) {
				i = i+1;
				table += ('<td class="other-month"><span class="day">'+ dc(i) +'</span></td>');
			}else{
				table += ('<td class="current-month day'+(j-firstDay+1)+'"><span class="day">'+dc(j-firstDay+1)+'</span></td>');
			}
			if (j%7==6)  table += ('</tr>');
		}

		table += ('</table>');

		el.html(table);
	}

	function dc(n) {
		var str = '' + n;
		while (str.length < 2) {
			str = '0' + str;
		}
		return str;
	}

	function getDaysInMonth(month,year)  {
		var daysInMonth=[31,28,31,30,31,30,31,31,30,31,30,31];
		if ((month==1)&&(year%4==0)&&((year%100!=0)||(year%400==0))){
			return 29;
		}else{
			return daysInMonth[month];
		}
	}


	// jQuery plugin initialisation
	$.fn.calendarWidget = function(params) {
		calendarWidget(this, params);
		return this;
	};

})(jQuery);