/* jQuery countdown plugin
* version 1.0 (12/01/2008)
* developed by Alessandro Feijó
* alef@feijo.pro.br
* format_interval fn based on drupal homonym function
*/

(function($) { 

var vInt=0; // this variable controls the loop
var refresh=1; // refresh when a time finish
var interval=1000; // the loop interval


// this function autostarts the infinite loop, every second, triggers the countdown fn
jQuery.autocountdown = function () {
	$('.countdown').countdown(); // trigger the fn
	vInt=setInterval("$('.countdown').countdown();", interval); // set the loop
}

// countdown function, update second-by-second the time to finish
jQuery.fn.countdown = function (options) {
	var defaults = {  // set up default options
		refresh:     1,		 // refresh when a time finish
		interval:    1000, // the loop interval
		cdClass:     'countdown', // the class to apply this plugin
		granularity: 3,
		
		label:    ['w ', 'd ', 'h', ':', ''],
		units:    [604800, 86400, 3600, 60, 1]
	};
	if (options && options.label) {
		$.extend(defaults.label, options.label);
		delete options.label;
	}
    if (options && options.units) {
      $.extend(defaults.units, options.units);
      delete options.units;
    }
	$.extend(defaults, options);

	// pad fn, add left zeros to the string
	var pad = function (value, length) {
		value = String(value);
		length = parseInt(length) || 2;
		while (value.length < length)
			value = "0" + value;
		if (value<1) value = "00";
		return value;
	};

	var format_interval = function (timestamp) {
		var label = defaults.label;
		var units = defaults.units;
		var granularity = defaults.granularity;

		output = '';
		for (i=1; i<=units.length; i++) {
			value=units[i];
			if (timestamp >= value) {	      				
				var val=pad(Math.floor(timestamp / value), 2);
				val = val>0 ? val : '00';
				output += val + label[i];
				timestamp %= value;
				granularity--;
			} 
			else if (value==1) output += '00'; // we need the final seconds to allways show 00, i.e., 03:00

			if (granularity == 0)
				break; 
		}
		
		if (output.length<3) output = '00:'+output;
		return output ? output : '00:00';
	}
	
	// the countdown core
	return this.each(function() {
		secs=$(this).attr('secs');
		$(this).html(format_interval(secs));
		secs--;
		
		if (secs<1) {
			$(this).attr('secs', '...');
			clearInterval(vInt);
			if (refresh)
				window.location.href = window.location.href;
		} else
			$(this).attr('secs', secs);
		
	});

}

	$.autocountdown(); // loop
})(jQuery);