// -------------------------------------------------------------------------------------------
// 
// AVIA Countdown
// 
// @since 4.5.6  Countdown is UTC based to reflect different browser timezones
// 
// -------------------------------------------------------------------------------------------
(function($)
{ 
	"use strict";
	
	var _units	= ['years','months','weeks','days','hours','minutes','seconds'],
		_second = 1000,
		_minute = _second * 60,
		_hour 	= _minute * 60,
		_day 	= _hour * 24,
		_week	= _day * 7,
		
		getBetween = function( startDate, endDate, context )
		{
			var yearsDifference = endDate.getFullYear() - startDate.getFullYear();
			var monthsDifference = endDate.getMonth() - startDate.getMonth();
			var daysDifference = endDate.getDate() - startDate.getDate();
			var monthCorrection = 0;
			var result = {};
			
			if( daysDifference < 0 )
			{
				monthCorrection = -1;
				
				var days_start_month = new Date( startDate.getFullYear(), startDate.getMonth(), 0 ).getDate();
				daysDifference = days_start_month - startDate.getDate() + endDate.getDate();
			}
			
			if( context == 'months' )
			{
				result.months = yearsDifference * 12 + monthsDifference + monthCorrection,
				result.days = daysDifference;
			}
			else
			{
				result.years = yearsDifference;
				result.months = monthsDifference + monthCorrection,
				result.days = daysDifference;
			}
				
			return result;
		},
		
		ticker = function( _self )
		{
			var tmLoc 		= new Date(),
				_now		= new Date( tmLoc.getTime() + tmLoc.getTimezoneOffset() * 60000 ),		//	get UTC time
				_timestamp  = _self.end - _now;
			
			if( _timestamp <= 0 )
			{
				clearInterval( _self.countdown );
				return;
			}	
			
			_self.time.years	= 0;
			_self.time.months	= 0;
			_self.time.weeks   	= Math.floor( _timestamp / _week);
			_self.time.days 	= Math.floor( ( _timestamp % _week ) / _day );
			_self.time.hours	= Math.floor( ( _timestamp % _day ) / _hour ); 
			_self.time.minutes 	= Math.floor( ( _timestamp % _hour ) / _minute ); 
			_self.time.seconds 	= Math.floor( ( _timestamp % _minute ) / _second ); 
			
			switch( _self.data.maximum )
			{
				case 1: 
					_self.time.seconds = Math.floor( _timestamp / _second ); 
					break;
				case 2: 
					_self.time.minutes = Math.floor( _timestamp / _minute ); 
					break;
				case 3: 
					_self.time.hours = Math.floor( _timestamp / _hour );
					break;
				case 4: 
					_self.time.days = Math.floor( _timestamp / _day );
					break;
				case 6:
					var result = getBetween( _now, _self.end, 'months' );
					_self.time.days = result.days;
					_self.time.months = result.months;
					break;
				case 7:
					var result = getBetween( _now, _self.end, 'years' );
					_self.time.days = result.days;
					_self.time.months = result.months;
					_self.time.years  = result.years;
					break;
			}
			
			for( var i in _self.time )
			{	
				if( typeof _self.update[i] == "object" )
				{
					if(_self.firstrun || _self.oldtime[i] != _self.time[i])
					{
						var labelkey = ( _self.time[i] === 1 ) ? "single" : "multi"; 
					
						_self.update[i].time_container.text(_self.time[i]);
						_self.update[i].label_container.text(_self.update[i][labelkey]);
					}
				}
			}
			
			//show ticker
			if(_self.firstrun) _self.container.addClass('av-countdown-active');
			
			_self.oldtime 	= $.extend( {}, _self.time );
			_self.firstrun	= false;
		};
		
	
	$.fn.aviaCountdown = function( options )
	{	
		if( ! this.length) 
		{
			return;
		} 

		return this.each( function()
		{
			var _self = {};
			
			_self.update = {};
			_self.time = {};			
			_self.oldtime = {};			
			_self.firstrun = true;			
			_self.container = $(this);
			_self.data = _self.container.data();
			_self.end = new Date( _self.data.year, _self.data.month, _self.data.day, _self.data.hour, _self.data.minute );
			
			if( _self.data.timezone != '0' )
			{
				_self.end = new Date( _self.end.getTime() - _self.data.timezone * 60000 );
			}
			
			for( var i in _units )
			{
				_self.update[_units[i]] = {
										time_container:  _self.container.find('.av-countdown-' + _units[i] + ' .av-countdown-time'),
										label_container: _self.container.find('.av-countdown-' + _units[i] + ' .av-countdown-time-label')
									};
				
				if( _self.update[_units[i]].label_container.length )
				{
					_self.update[_units[i]].single = _self.update[_units[i]].label_container.data('label');
					_self.update[_units[i]].multi  = _self.update[_units[i]].label_container.data('label-multi');
				}
			}
			
			ticker( _self );
			_self.countdown = setInterval( function(){ ticker( _self ); }, 1000 );
		});
	};
	
}(jQuery));