const displayedImage = document.querySelector('.displayed-img');
const thumbBar = document.querySelector('.thumb-bar');

const btn = document.querySelector('button');
const overlay = document.querySelector('.overlay');

//Looping image

for (let i = 1; i <= 5; i++) {
  const newImage = document.createElement('img');
  newImage.setAttribute('src', 'pic' + i + '.jpg');
  thumbBar.appendChild(newImage);
  newImage.onclick = function (e) {
    displayedImage.src = e.target.src;
  }
}

//Adding darken effect and revert option

btn.onclick = function () {
  const btnClass = btn.getAttribute('class');
  if (btnClass === 'dark') {
    btn.setAttribute('class', 'light');
    btn.textContent = 'Lighten';
    overlay.style.backgroundColor = 'rgba(0,0,0,0.5)';
  } else {
    btn.setAttribute('class', 'dark');
    btn.textContent = 'Darken';
    overlay.style.backgroundColor = 'rgba(0,0,0,0)';
  }
}