<script>
	window.onload = function () {
		if (typeof window !== 'undefined') {
			const slider = document.querySelector('#demo-swiper-js-slides');
			const indicators = document.querySelectorAll('.demo-swiper-js-indicators span');

			slider.addEventListener('scroll', () => {
				updateActiveIndicator();
			});

			function updateActiveIndicator() {
				const { scrollLeft, clientWidth } = slider;
				const activeIndex = Math.round(scrollLeft / clientWidth);
				indicators.forEach((indicator, index) => {
					if (index === activeIndex) {
						indicator.dataset.active = true;
					} else {
						indicator.dataset.active = false;
					}
				});
			}
			updateActiveIndicator();
		}
	};
</script>

<div class="product">
	<div class="demo-slide-show">
		<div class="demo-slide-show-slides" id="demo-swiper-js-slides">
			<figure id="slide1" class="demo-slide-show-slide">
				<img src="/demo-images/1.png" alt="" />
			</figure>
			<figure id="slide2" class="demo-slide-show-slide">
				<img src="/demo-images/2.png" alt="" />
			</figure>
			<figure id="slide3" class="demo-slide-show-slide">
				<img src="/demo-images/3.png" alt="" />
			</figure>
			<figure id="slide4" class="demo-slide-show-slide">
				<img src="/demo-images/4.png" alt="" />
			</figure>
		</div>
		<div class="demo-swiper-js-indicators">
			<span></span>
			<span></span>
			<span></span>
			<span></span>
		</div>
	</div>
	<h4>Syntax Basketball</h4>
	<p>$42.00</p>
</div>

<style>
	.product {
		--demo-slide-show-size: 300px;
		margin-inline: auto;
		width: var(--demo-slide-show-size);
	}

	.demo-slide-show {
		position: relative;
		border-radius: 10px;
	}

	.slider__nav {
		position: absolute;
		display: flex;
		justify-content: space-between;
		width: 140%;
		inset: 0 -20%;
		z-index: 0;
		button {
			border: none;
			cursor: pointer;
			transition: 0.2s ease opacity;
			&:first-child {
				opacity: 0;
			}
		}
	}

	.demo-slide-show-slides {
		z-index: 1;
		position: relative;
		display: flex;
		align-items: center;
		overflow-x: scroll;
		scroll-snap-type: x mandatory;
		overscroll-behavior-x: contain;
		border-radius: 10px;
	}

	.demo-slide-show-slide {
		margin: 0;
		scroll-snap-align: start;
		flex-shrink: 0;
		display: flex;
		align-items: center;
		justify-content: center;
		width: var(--demo-slide-show-size);
	}

	.demo-slide-show-slide > img {
		max-width: 100%;
		height: 100%;
		object-fit: contain;
	}

	.demo-swiper-js-indicators {
		position: absolute;
		bottom: 10px;
		inset-inline: 0;
		justify-content: center;
		display: flex;
		gap: 10px;
		z-index: 2;
		span {
			block-size: 10px;
			inline-size: 10px;
			border-radius: 50%;
			background-color: #ccc;
			opacity: 0.8;
			&[data-active='true'] {
				background-color: #fff;
				scale: 1.3;
				opacity: 1;
			}
		}
	}
</style>

<!-- TODO clean up classes and names -->