$(function() {

	var Timer = function(timer, settings) {

		var _this = this;

		_this.instance = timer instanceof $ ? timer : $(timer);

		_this.timer = false;

		_this.active = false;

		_this.settings = {
			time_end: _this.instance.data('time-end'),
			display_days: true
		}

		$.extend(true, _this.settings, settings);
		
		_this.start( _this.instance );

	}

	Timer.prototype.get_hours_left = function(timestamp, in_seconds) {

		var _this = this,
			hours;

		if ( typeof in_seconds === 'undefined' ) in_seconds = true;
		if ( !in_seconds ) timestamp = timestamp / 1000;

		hours = timestamp / 60 / 60;

		return _this.settings.display_days ? hours % 24 : hours;

	}

	Timer.prototype.get_time_breakdown = function(timestamp) {

		var _this = this;

		if ( timestamp <= 0 ) return false;
		timestamp = timestamp / 1000;

		return {
			days: Math.floor( timestamp / 60 / 60 / 24 ),
			hours: Math.floor( _this.get_hours_left(timestamp) ),
			minutes: Math.floor( ( timestamp / 60 ) % 60 ),
			seconds: Math.floor( timestamp % 60 )
		}

	}

	Timer.prototype.get_time_left = function() {

		var _this = this;
		
		// Needs local timezone support support
		
		return new Date(_this.settings.time_end).getTime() - new Date();

	}

	Timer.prototype.refresh_display = function() {

		var _this = this;

		if ( !_this.active ) {
			_this.instance.removeClass('timer-is-active').addClass('timer-is-expired');
			return;
		}

		_this.instance.removeClass('timer-is-expired').addClass('timer-is-active');

		for ( var key in _this.time ) {

			var $container = _this.instance.find('.timer-' + key),
				$label = $container.find('.timer-label'),
				$digits = $('<span class="timer-digits"></span>'),
				time_split = Array.prototype.slice.call(_this.time[key].toString().split('')),
				time_split_len = time_split.length;

			if ( time_split_len === 0 ) continue;

			$digits.html('');

			for ( var i = 0; i < time_split_len; i++ ) {

				var $digit = $('<span></span>');

				$digit.text(time_split[i]).attr('class', 'timer-digit-' + time_split[i])

				$digits.append($digit);

			}

			if ( !$container.find('.timer-digits')[0] ) {
				$container.prepend($digits);
			} else {
				$container.find('.timer-digits').html($digits.html());
			}

			$label.text( $label.attr('data-label') + ( _this.time[key] === 1 ? '' : 's' ) );
			$label.attr('data-multiple', _this.time[key] === 1 ? 'true' : 'false' )			

		}

		return _this;

	}

	Timer.prototype.update = function(time_left) {

		var _this = this;

		_this.time = _this.get_time_breakdown(time_left);
		_this.active = _this.time ? true : false;

		if ( !_this.active ) _this.stop();
		
		_this.refresh_display();

		return _this;

	}

	Timer.prototype.start = function() {

		var _this = this;

		_this.update( _this.get_time_left() );

		_this.timer = setInterval(function() {

			_this.update( _this.get_time_left() );

		}, 1000);

		return _this;

	}

	Timer.prototype.stop = function() {

		var _this = this;

		clearInterval(_this.timer);

		return _this;

	}

	$.fn.timer = function(action) {
		
		var _this = this,
			_this_len = _this.length;

		for ( var i = 0; i < _this_len; i++ ) {
			if ( typeof action === 'object' || typeof action === 'undefined' ) {
				_this[i].timer = new Timer(_this[i], action)
			} else {
				_this[i].timer[action]();
			}
		}

		return _this;

	}

});