// JavaScript Document
/*
1. everyTime(时间间隔, [计时器名称], 函式名称, [次数限制], [等待函式程序完成])
2. oneTime(时间间隔, [计时器名称], 呼叫的函式)
3. stopTime ([计时器名称], [函式名称])
*/
/*************************************************************
*   everyTime(时间间隔, [计时器名称], 函式名称, [次数限制], [等待函式程序完成])
*************************************************************/
/*
//每1秒执行函式test()
function test(){
   //do something...
}
$('body').everyTime('1s',test);
//每1秒执行
$('body').everyTime('1s',function(){
//do something...
});
//每1秒执行，并命名计时器名称为A
$('body').everyTime('1s','A',function(){
//do something...
});
//每20秒执行，最多5次，并命名计时器名称为B
$('body').everyTime('2das','B',function(){
//do something...
},5);
//每20秒执行，无限次，并命名计时器名称为C
//若时间间隔抵到，但函式程序仍未完成则需等待执行函式完成后再继续计时
$('body').everyTime('2das','C',function(){
    //执行一个会超过20秒以上的程式
},0,true);
*/
/***********************************************************
*   oneTime(时间间隔, [计时器名称], 呼叫的函式)
***********************************************************/
/*
//倒数10秒后执行
$('body').oneTime('1das',function(){
//do something...
});
//倒数100秒后执行，并命名计时器名称为D
$('body').oneTime('1hs','D',function(){
//do something...
});
*/
/************************************************************
*  stopTime ([计时器名称], [函式名称])
************************************************************/
//停止所有的在$('body')上计时器
/*
$('body').stopTime ();
//停止$('body')上名称为A的计时器
$('body').stopTime ('A');
//停止$('body')上所有呼叫test()的计时器
$('body').stopTime (test);
*/

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);
		}
	});