package com.janumedia.util
{
	import flash.events.Event;
	import flash.events.KeyboardEvent;
	import flash.events.TextEvent;
	import flash.events.TimerEvent;
	import flash.text.TextField;
	import flash.text.TextFormat;
	import flash.ui.Keyboard;
	import flash.utils.Timer;
 
	public class PasswordMaker
	{
		private var _target:TextField;
		private var _regExp:RegExp = /./g;
		private var _timer:Timer
		private var _oriPass:String = "";
 
		public function PasswordMaker()
		{
		}
 
		public function setPassword (t:TextField, delay:Number=500) : void
		{
			_timer = new Timer(delay);
			_target = t;
			_oriPass = _target.text;
 
			_timer.addEventListener (TimerEvent.TIMER, replaceOnTime, false, 0, true);
			_target.addEventListener (TextEvent.TEXT_INPUT, startTimer, false, 0, true);
			_target.addEventListener (KeyboardEvent.KEY_DOWN, keyboardEvent, false, 0, true);
 
			// dispatchEvent in case already has text initializing
			_target.dispatchEvent( new TextEvent (TextEvent.TEXT_INPUT) );
		}
 
		public function getPassword () : String
		{
			return _oriPass;
		}
 
		private function replaceOnTime (e:TimerEvent) : void
		{
			var fm:TextFormat = _target.getTextFormat();
			fm.letterSpacing = 3;
 
			_target.text = _oriPass.replace (_regExp, "•");
			_target.setTextFormat(fm);
 
			_timer.stop();
		}
 
		private function keyboardEvent (e:KeyboardEvent) : void
		{
			// single char deletion
			if (_target.selectionBeginIndex == _target.selectionEndIndex)
			{
				if (e.keyCode == Keyboard.BACKSPACE)
				{
					_oriPass = _oriPass.substr(0, _target.caretIndex-1) + _oriPass.substr(_target.caretIndex)
 
				} else if (e.keyCode == Keyboard.DELETE)
				{
					_oriPass = _oriPass.substr(0, _target.caretIndex) + _oriPass.substr(_target.caretIndex+1)
				}
 
			// multiple chars deletion
			} else 
			{
				if (e.keyCode == Keyboard.BACKSPACE || e.keyCode == Keyboard.DELETE)
				{
					_oriPass = _oriPass.substr(0, _target.selectionBeginIndex) + _oriPass.substr(_target.selectionEndIndex)
				}
			}
		}
 
		private function startTimer (e:TextEvent) : void
		{
			if (_target.selectedText.length > 0)
			{
				_oriPass = _oriPass.substring(0,_target.selectionBeginIndex) + e.text + _oriPass.substring(_target.selectionEndIndex)
 
			} else 
			{
				_oriPass = _oriPass.substring(0,_target.caretIndex) + e.text + _oriPass.substring(_target.caretIndex)
			}
 
			if (_timer.running) _timer.reset();
 
			_timer.start();
		}
 
		public function reset () : void
		{
			_oriPass = "";
		}
 
	}
}