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const EVENT = 'mousedown';

const ripple = {
  mounted(el) {
    el.addEventListener(EVENT, createRipple);
  },
  unmounted(el) {
    el.removeEventListener(EVENT, createRipple);
  },
};

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function createRipple(event) {
  const target = event.currentTarget;
  const { top, left } = target.getBoundingClientRect();
  const { clientWidth, clientHeight } = target;
  const diameter = Math.sqrt(clientWidth ** 2 + clientHeight ** 2);
  const radius = diameter / 2;
  const localX = event.clientX - left;
  const localY = event.clientY - top;

  const ripple = document.createElement('span');
  ripple.setAttribute('class', 'v-ripple');
  ripple.setAttribute(
    'style',
    `
      width: ${diameter}px;
      height: ${diameter}px;
      left: ${localX - radius}px;
      top: ${localY - radius}px;
    `,
  );

  ripple.addEventListener('animationend', removeRipple);
  target.appendChild(ripple);
}

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function removeRipple(event) {
  const ripple = this;
  ripple.remove();
  ripple.addEventListener('animationend', removeRipple);
}

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.v-ripple {
  position: absolute;
  background-color: currentColor;
  border-radius: 50%;
  opacity: 0.2;
  transform: scale(0);
  animation: v-ripple-animation 0.6s linear;
}

@keyframes v-ripple-animation {
  to {
    opacity: 0;
    transform: scale(4);
  }
}