(function(){
	"use strict";

	function Led(pin){

		return {
			on: function(){
				pin.output(1);
			},
			off: function(){
				pin.output(0);
			}
		};
	}



	function LedFlasher(led){
		var VSLOW = 1000;
		var SLOW = 666;
		var MODERATE = 333;
		var FAST = 100;

		var fTimer = null;
		function flashing(rate){
			console.log("Flashing: ", rate);
			if (null === state){
				led.off();
				state = false;
			}
			if (fTimer !== null){
				clearInterval(fTimer);
			}

			fTimer = setInterval(toggle, rate);
		}

		var state = null;
		function toggle(){
			state = !state;

			if (state){
				led.on();
			}
			else {
				led.off();
			}
		}

		function steady(state){
			console.log("Steady: ", state);
			if (null !== fTimer){
				clearInterval(fTimer);
				fTimer = null;
			}

			if (state) {
				led.on();
			}
			else {
				led.off();
			}
		}


		return {
			on: function(){ steady(true); },
			off: function(){ steady(false); },
			slowest: function(){ flashing(VSLOW); },
			slow: function(){ flashing(SLOW); },
			fast: function(){ flashing(FAST); },
			flash: function(){ flashing(MODERATE); }
		};
	}

	module.exports = {
		create: Led,
		createFlasher: LedFlasher
	};


})();