// create window.TIMER
window.TIMER = window.TIMER || {};

// begin init function
var init = function() {
	var activeTime = 0;  // number of seconds active timer should run for
	var active_timer_is_on = false; // flag for active timer
	var intervals_left=0; //intializing interval counter
	var number_of_intervals = 0; // number of intervals the workout timer should perform.
	var nextPhase = ""; // number of intervals remaining while the timer is running.
	var restTime = 0; // number of seconds rest timer should run fo
	var rest_timer_is_on = false; // flag for rest time
	TIMER.time_left = 0; //intialize timer counter
	var timer_is_on = false; // flag for workout timer
	var wt; // initializing timeout variable

	// function to switch phases mid interval
	var switchPhase = function(){
		if (active_timer_is_on === true){
			active_timer_is_on = false;
			rest_timer_is_on = true;
			return;
		}
		if (rest_timer_is_on === true){
			rest_timer_is_on = false;
			active_timer_is_on = true;
		} else {
			console.log('both timers in "switchPhase" are false')
		}
	};

	// function to output how much time and intervals are left in timer
	// console.log is for debugging purposes and will be removed from final version
	var msgGenerator = function(time, phase, intervals){
		if (intervals > 1){
			console.log(time + " seconds left until the next " + phase + " phase and you have " + intervals + " intervals left.");
			return time + "<br/>" + intervals + " intervals left.";
		}
		if (intervals === 1){
			console.log (time + " seconds left until the next " + phase + " phase and you have " + intervals + " interval left.");
			return time + "<br/>" + intervals + " interval left.";
		}
		if (intervals === 0 && phase === "rest"){
			console.log (time + " seconds left in this active phase and this is the last interval.");
			return time + "<br /> Last active phase.  Long rest after this.  You can do it!";
		}
		if (intervals === 0 && phase === "active"){
			console.log (time + " seconds left until you are done!");
			return time + "<br /> The last rest phase!  You are almost done!";
		}
		if (intervals < 0){
		console.log ("YOUR ARE DONE!");
		return "FINISHED";
		}
		console.log ("no msg generated " + intervals + " intervals left");
		return;
	};

	// function that actually counts down the time
	TIMER.timedCount = function(time_left) {
		if (time_left >= 0){
			document.getElementById('counter').innerHTML = msgGenerator(time_left, nextPhase, intervals_left);
			time_left--;
			wt=setTimeout("TIMER.timedCount("+time_left+")",1000);
		} else {
			clearTimeout(wt);
			switchPhase();
			fartlekCounter();
		}
	}

	// checks interval count
	var fartlekCounter = function() {

		if (intervals_left > 0 && active_timer_is_on === true){
			//time_left = activeTime;
			nextPhase = "rest";
			intervals_left--;
			document.getElementById('counter').style.background = "green";
			TIMER.timedCount(activeTime);
		} else if (intervals_left >= 0 && rest_timer_is_on === true){
			//time_left = restTime;
			nextPhase = "active";
			document.getElementById('counter').style.background = "red";
			TIMER.timedCount(restTime);
		} else{
			timer_is_on = false;
			document.getElementById('counter').innerHTML = msgGenerator(intervals_left);
			console.log("YOU ARE DONE!");
		}
	};

	//starts the timer
	TIMER.doTimer = function () {
		if (timer_is_on === true){
			return;
		}
		activeTime = document.getElementById('active_time').value;
		number_of_intervals = document.getElementById('number_of_intervals').value;
		restTime = document.getElementById('rest_time').value;
		timer_is_on = true;
		active_timer_is_on = true;
		intervals_left = number_of_intervals;
		fartlekCounter();
		}

	//Stop Timer
	TIMER.stopCount = function (){
		clearTimeout(wt);
		timer_is_on = false;
	}
// end init function
};

$(document).ready(init);

//var add_event_handlers = function() {
//	$('#start_btn').on('click', TIMER.doTimer);
//};