/*

===== TODOs =====
BUGS

- start timer, try to close window, escapre from confirm dialog (adds about 12mins to time)

MVP

- cleanup
- deploy

Extras

- set alarm for after certain times have passed
- display previous entries (build API that saves in DB)
- auth (normal + google/twitter/facebook/apple/spotify sign in)
- use audo api to pause when no sound is detected
- hook up practice log or build it in

*/

let startTime = 0;
let savedPreviousSeconds = 0;
let running = false;
let windowInterval;

const previousSessionAccumulatedSeconds = parseInt(window.localStorage.getItem('savedPreviousSeconds'));
if(previousSessionAccumulatedSeconds){
	savedPreviousSeconds = previousSessionAccumulatedSeconds
}

const padDigits = (value) => {
	if(value < 10){
		return '0'+value;
	} else {
		return value;
	}
}

const getMinutes = (seconds) => {
	return Math.floor( seconds / 60 );
}

const formatSeconds = (total) => {
	const minutes = getMinutes(total);
	const seconds = total - minutes*60;
	return `${minutes}:${padDigits(seconds)}`;
}

const formatMinuteBlocks = (seconds) => {
	const minutes = getMinutes(seconds);
	const fiveMins = Math.floor(minutes/5);
	const tenMins = Math.floor(minutes/10);
	return `5 minute blocks: ${fiveMins}<br/>  10 minute blocks: ${tenMins}`;
}

const getAccumulatedSeconds = (newerTime, olderTime) => {
	return Math.floor((newerTime-olderTime)/1000);
}

const displayTime = () => {
	const totalSeconds = getAccumulatedSeconds(Date.now(),startTime) + savedPreviousSeconds;
	document.querySelector('code').innerHTML = formatSeconds(totalSeconds);
	document.querySelector('small').innerHTML = formatMinuteBlocks(totalSeconds);
}

const start = (event) => {
	startTime = Date.now();
	running = true;
	document.querySelector('body').classList.add('running');
	document.querySelector('#start').disabled=true;
	document.querySelector('#stop').disabled=false;
	document.querySelector('#reset').disabled=true;
	windowInterval = window.setInterval(displayTime,1000)
};

const stop = (event) => {
	updateSavedPreviousSeconds();
	running = false;
	document.querySelector('body').classList.remove('running');
	document.querySelector('#start').disabled=false;
	document.querySelector('#stop').disabled=true;
	document.querySelector('#reset').disabled=false;
	window.clearInterval(windowInterval)
};

const updateSavedPreviousSeconds = () => {
	savedPreviousSeconds += getAccumulatedSeconds(Date.now(), startTime);
}

const postToAPI = ()=>{
	if(savedPreviousSeconds > 0){
		fetch('http://localhost:8000/api/sessions',{
			method: 'POST',
			headers: {
				'Content-Type': 'application/json'
			},
			body: JSON.stringify({seconds:savedPreviousSeconds})
		});
	}
}

document.querySelector('code').innerHTML = formatSeconds(savedPreviousSeconds);
document.querySelector('small').innerHTML = formatMinuteBlocks(savedPreviousSeconds);
if(savedPreviousSeconds !== 0){
	document.querySelector('#reset').disabled=false;
}

document.querySelector('#start').addEventListener('click', start)

document.querySelector('#stop').addEventListener('click', stop)

document.querySelector('#reset').addEventListener('click', (event) => {
	postToAPI();
	savedPreviousSeconds = 0;
	document.querySelector('code').innerHTML = formatSeconds(savedPreviousSeconds);
	document.querySelector('small').innerHTML = formatMinuteBlocks(savedPreviousSeconds);
	document.querySelector('#reset').disabled=true;
})

document.querySelector('body').addEventListener('keyup', (event) => {
	if(event.keyCode === 32){
		if(running){
			stop();
		} else {
			start();
		}
	}
})

window.onbeforeunload = function(){
	if(running){
		updateSavedPreviousSeconds();
	}
	window.localStorage.setItem('savedPreviousSeconds', savedPreviousSeconds);
	if(savedPreviousSeconds > 0){
		postToAPI();
		return 'Good bye';
	}
}