const timeDown = document.getElementById('time-down');

const timeUp = document.getElementById('time-up');

const timeSelect = document.getElementById('time-select');

const time = document.getElementById('time');

const play = document.getElementById('play');

const pause = document.getElementById('pause');

const stop = document.getElementById('stop');

const bell = new Audio('bell.mp3');

let minute = parseInt(timeSelect.textContent);

let second = 0;

timeUp.addEventListener('click', increaseTime);

timeDown.addEventListener('click', decreaseTime);

stop.addEventListener('click', stopTimer);

play.addEventListener('click', playTimer);

function playTimer() {

timeUp.removeEventListener('click', increaseTime);

timeDown.removeEventListener('click', decreaseTime);

play.removeEventListener('click', playTimer);

pause.addEventListener('click', pauseTimer);

stop.removeEventListener('click', stopTimer);

timer();

const timing = setInterval(timer, 1000);

function timer() {

switch (true) {

case (second == 0):

second = 60;

minute--;

break;

case (minute == 0 && second == 1):

bell.play();

time.textContent = "Time's up!";

clearInterval(timing);

stop.addEventListener('click', stopTimer);

break;

default:

second--;

time.textContent = minute + ':' + second;

};

};

function pauseTimer() {

clearInterval(timing);

pause.removeEventListener('click', pauseTimer);

stop.addEventListener('click', stopTimer);

play.addEventListener('click', playTimer);

};

};

function increaseTime() {

if (timeSelect.textContent == 59) {

timeSelect.textContent = 1;

} else {

timeSelect.textContent = parseInt(timeSelect.textContent) + 1;

minute++;

};

};

function decreaseTime() {

if (timeSelect.textContent == 1) {

timeSelect.textContent = 59;

} else {

timeSelect.textContent = parseInt(timeSelect.textContent) - 1;

minute--;

};

};

function stopTimer() {

minute = 25;

second = 0;

timeSelect.textContent = minute;

time.textContent = minute + ':00';

timeUp.addEventListener('click', increaseTime);

timeDown.addEventListener('click', decreaseTime);

play.addEventListener('click', playTimer);

};