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var IPE_Timer = (function(){

	// Self calling function
	// Private property for holding the only existing instance
	var T;

	var createTimer = function(){
		// Private properties
		var stop_flag  = false;
		var speed      = 1000;
		var count      = 0;
		var start_time = new Date().getTime();
		var onTick     = function(){};
		// Private methods
		var tick  = function(){
			count = count + speed;
			if ( stop_flag ) {
				return;
			}
			onTick( ( count / 1000 ) );
			set_ticker();
		};
		var set_ticker = function(){
			var diff = (new Date().getTime() - start_time) - count;
			setTimeout( function(){ 
				tick();
			}, (speed - diff));
		};
		var stop = function(){
			stop_flag = true;
		};
		var pause = function(){
			stop();
		};
		var resume = function(){
			stop_flag = false;
			set_ticker();
		};
		var start = function(callback){
			count = 0;
			onTick = callback;
			start_time = new Date().getTime();
			set_ticker();
		};
		return {
			// returns methods which is a 
			// closure with access to private properties.
			tick: tick,
			stop: stop,
			pause: pause,
			resume: resume,
			start: start
		};
	};
	
	return {
		// Method for creating instance of Timer.
		getT: function(){
			// Condition checking existence of instance
			if(!T){
				T = createTimer();
			}
			// If instance already existing returning the same.
			return T;
		}
	};
})();

/*
//usage: 
var tt = IPE_timer.getT(); 
tt.start( function( CurrentTime ){ 
  console.log('current Time in seconds ' + CurrentTime); 
});
*/