/**
 * Binds a function to the given object's scope
 *
 * @param {Object} object The object to bind the function to.
 * @return {Function}	Returns the function bound to the object's scope.
 */
if (Function.prototype.bind == null) {
	Function.prototype.bind = function (object)
	{
		var method = this;
		return function ()
		{
			return method.apply(object, arguments);
		};
	};
}

if (Array.prototype.add == null)
{
	Array.prototype.add = function(ele){
		this[this.length] = ele;
	};
}

/**
 * Create a new instance of EventListener.
 *
 * @classDescription	This class creates a new Event.
 * @return {Object}	Returns a new Event object.
 * @constructor
 */
function EventListener()
{
	this.events = [];
	this.builtinEvts = [];
}

/**
 * Gets the index of the given action for the element
 *
 * @memberOf EventListener
 * @param {Object} obj The element attached to the action.
 * @param {String} evt The name of the event.
 * @param {Function} action The action to execute upon the event firing.
 * @param {Object} binding The object to scope the action to.
 * @return {Number} Returns an integer.
 */
EventListener.prototype.getActionIdx = function(obj,evt,action,binding)
{
	if(obj && evt)
	{
		var curel = this.events[obj][evt];
		if(curel)
		{
			var len = curel.length;
			for(var i = len-1; i >= 0; i--)
			{
				if(curel[i].action == action && curel[i].binding == binding)
				{
					return i;
				}
			}
		}
		else
		{
			return -1;
		}
	}
	return -1;
};

/**
 * Adds a listener
 *
 * @memberOf EventListener
 * @param {Object} obj The element attached to the action.
 * @param {String} evt The name of the event.
 * @param {Function} action The action to execute upon the event firing.
 * @param {Object} binding The object to scope the action to.
 * @return {null} Returns null.
 */
EventListener.prototype.addListener = function(obj,evt,action,binding)
{
	if(this.events[obj])
	{
		if(this.events[obj][evt])
		{
			if(this.getActionIdx(obj,evt,action,binding) == -1)
			{
				var curevt = this.events[obj][evt];
				curevt.add( {action:action,binding:binding} );
			}
		}
		else
		{
			this.events[obj][evt] = [];
			this.events[obj][evt].add( {action:action,binding:binding} );
		}
	}
	else
	{
		this.events[obj] = [];
		this.events[obj][evt] = [];
		this.events[obj][evt].add( {action:action,binding:binding} );
	}
};

/**
 * Removes a listener
 *
 * @memberOf EventListener
 * @param {Object} obj The element attached to the action.
 * @param {String} evt The name of the event.
 * @param {Function} action The action to execute upon the event firing.
 * @param {Object} binding The object to scope the action to.
 * @return {null} Returns null.
 */
EventListener.prototype.removeListener = function(obj,evt,action,binding)
{
	if(this.events[obj])
	{
		if(this.events[obj][evt])
		{
			var idx = this.getActionIdx(obj,evt,action,binding);
			if(idx >= 0)
			{
				this.events[obj][evt].splice(idx,1);
			}
		}
	}
};

/**
 * Fires an event
 *
 * @memberOf EventListener
 * @param e [(event)] A builtin event passthrough
 * @param {Object} obj The element attached to the action.
 * @param {String} evt The name of the event.
 * @param {Object} args The argument attached to the event.
 * @return {null} Returns null.
 */
EventListener.prototype.fireEvent = function(e,obj,evt,args)
{
	if(!e){e = window.event;}

	if(obj && this.events)
	{
		var evtel = this.events[obj];
		if(evtel)
		{
			var curel = evtel[evt];
			if(curel)
			{
				for(var act = 0; act < curel.length; act++)
				{
					var action = curel[act].action;
					if(curel[act].binding)
					{
						action = action.bind(curel[act].binding);
					}
					action(args);
				}
			}
		}
	}
};