/**
 * jQuery.timers - Timer abstractions for jQuery
 * Written by Blair Mitchelmore (blair DOT mitchelmore AT gmail DOT com)
 * Licensed under the WTFPL (http://sam.zoy.org/wtfpl/).
 * Date: 2008/08/26
 *
 * @author Blair Mitchelmore
 * @version 1.0.0
 *
 **/

jQuery.fn.extend({
	everyTime: function(interval, label, fn, times, belay){
		return this.each(function(){
			jQuery.timer.add(this, interval, label, fn, times, belay);
		});
	},
	oneTime: function(interval, label, fn){
		return this.each(function(){
			jQuery.timer.add(this, interval, label, fn, 1);
		});
	},
	stopTime: function(label, fn){
		return this.each(function(){
			jQuery.timer.remove(this, label, fn);
		});
	}
});

jQuery.extend({
	timer: {
		guid: 1,
		global: {},
		regex: /^([0-9]+)\s*(.*s)?$/,
		powers: {
			// Yeah this is major overkill...
			'ms': 1,
			'cs': 10,
			'ds': 100,
			's': 1000,
			'das': 10000,
			'hs': 100000,
			'ks': 1000000
		},
		timeParse: function(value){
			if(value == undefined || value == null)
				return null;
			var result = this.regex.exec(jQuery.trim(value.toString()) );
			if(result[2]){
				var num = parseInt(result[1], 10);
				var mult = this.powers[result[2]] || 1;
				return num * mult;
			} else {
				return value;
			}
		},
		add: function(element, interval, label, fn, times, belay){
			var counter = 0;
			
			if(jQuery.isFunction(label) ){
				if(!times) 
					times = fn;
				fn = label;
				label = interval;
			}
			
			interval = jQuery.timer.timeParse(interval);

			if(typeof interval != 'number' || isNaN(interval) || interval <= 0)
				return;

			if(times && times.constructor != Number){
				belay = !!times;
				times = 0;
			}
			
			times = times || 0;
			belay = belay || false;
			
			if(!element.$timers) 
				element.$timers = {};
			
			if(!element.$timers[label])
				element.$timers[label] = {};
			
			fn.$timerID = fn.$timerID || this.guid++;
			
			var handler = function(){
				if(belay && this.inProgress) 
					return;
				this.inProgress = true;
				if((++counter > times && times !== 0) || fn.call(element, counter) === false)
					jQuery.timer.remove(element, label, fn);
				this.inProgress = false;
			};
			
			handler.$timerID = fn.$timerID;
			
			if(!element.$timers[label][fn.$timerID]) 
				element.$timers[label][fn.$timerID] = window.setInterval(handler,interval);
			
			if( !this.global[label] )
				this.global[label] = [];
			this.global[label].push( element );
			
		},
		remove: function(element, label, fn){
			var timers = element.$timers, ret;
			
			if( timers ){
				
				if(!label){
					for ( label in timers )
						this.remove(element, label, fn);
				} else if( timers[label] ){
					if( fn ){
						if( fn.$timerID ){
							window.clearInterval(timers[label][fn.$timerID]);
							delete timers[label][fn.$timerID];
						}
					} else {
						for ( var fn in timers[label] ){
							window.clearInterval(timers[label][fn]);
							delete timers[label][fn];
						}
					}
					
					for ( ret in timers[label] ) break;
					if( !ret ){
						ret = null;
						delete timers[label];
					}
				}
				
				for ( ret in timers ) break;
				if( !ret ) 
					element.$timers = null;
			}
		}
	}
});

if(jQuery.browser.msie)
	jQuery(window).one("unload", function(){
		var global = jQuery.timer.global;
		for ( var label in global ){
			var els = global[label], i = els.length;
			while ( --i )
				jQuery.timer.remove(els[i], label);
		}
	});