$(document).ready(function(){
	// declare freeDays global
	var freeDays = [];
	 
	// perform initial json request for free days
	fetchFreeDays();
	 
	 
	 $("#calendar").datepicker({
		changeMonth: false,
		changeYear: false,
		showOtherMonths: false,
		selectOtherMonths: true,
		dateFormat: 'DD, d MM, yy',
		altField: '#date_due',
		altFormat: 'yy-mm-dd',
		beforeShowDay: highlightDays,
		onChangeMonthYear: fetchFreeDays,
		onSelect: function(date, inst){
			var d = new Date(date);
			var curr_date = d.getDate();
			var curr_month = d.getMonth();
			curr_month++;
			var curr_year = d.getFullYear();
			var ndx_date = curr_month + "/" + curr_date + "/" + curr_year;
			
			var data = {};
			
			for(var i = 0; i < freeDays.length; i++){
				if(freeDays[i].date == ndx_date){
					data = freeDays[i];
					
					if(data.url.length > 0) {
						var redirect_url = "http://" + document.domain + "/" + data.url; 
						window.location = redirect_url;
					}
					
					
				}
			}
		},
		firstDay: 1 // rows starts on Monday
	});
	
	$('a.ui-state-default').click(function(evt){
		evt.preventDefault();
	});
 
	// query for free days in datepicker
	function fetchFreeDays(year, month) {
		var start_date = '';
	 
		// if a month and year were supplied, build a start_date in yyyy-mm-dd format
		if (year != undefined && month != undefined) {
		  start_date = year +'-';
		  start_date += month +'-';
		  start_date += '01';
		}
	 
		$.ajax({
			url: "/special-events.php?start_date="+ start_date,
			dataType: 'json',
			async: false,
			success: function(data){
				$.each(data, function(index, value) {
					freeDays.push({"date": value.freeDate, "isEvent": value.isEvent, "url": value.url}); // add this date to the freeDays array
				});	
			}
		});
	}
	 
	// runs for every day displayed in datepicker, adds class and tooltip if matched to days in freeDays array
	function highlightDays(date) {
		for (var i = 0; i < freeDays.length; i++) {
			var free_day = freeDays[i];
			var check_date = new Date(free_day.date).toString();
			var cal_date = date.toString();
			if ((check_date == cal_date) && free_day.isEvent == true) {
				return [true, 'event-day', 'Event']; // [0] = true | false if this day is selectable, [1] = class to add, [2] = tooltip to display
			}
		}
	 
		return [true, 'free-day'];
	}
	
});