package main

// lightboxGalleryComponent renders the gallery grid with lightbox triggers.
templ lightboxGalleryComponent(items []LightboxItem, cols int) {
	<section data-block="noir:lightbox_gallery" class="py-12">
		<div class="max-w-6xl mx-auto px-6">
			if len(items) == 0 {
				<div class="hairline p-12 text-center tracked-mono" style="color: hsl(var(--mutedForeground));">
					Add photographs to populate the gallery.
				</div>
			} else {
				<div class={ "grid gap-4", lightboxGridCols(cols) }>
					for i, item := range items {
						<figure class="noir-figure">
							<button
								type="button"
								data-noir-lightbox-trigger
								data-src={ item.Image }
								data-alt={ item.Caption }
								data-caption={ item.Caption }
								class="block w-full p-0 m-0 cursor-zoom-in bg-transparent border-0"
								style="background: transparent;"
								aria-label={ lightboxAriaLabel(i, item.Caption) }
							>
								<img
									src={ item.Image }
									alt={ item.Caption }
									loading="lazy"
									class="w-full h-auto block"
								/>
							</button>
							if item.Caption != "" {
								<figcaption class="tracked-mono mt-2" style="color: hsl(var(--mutedForeground));">
									{ item.Caption }
								</figcaption>
							}
						</figure>
					}
				</div>
			}
		</div>
	</section>
}

// lightboxGridCols returns Tailwind grid-template-columns utility for the requested columns.
func lightboxGridCols(cols int) string {
	switch cols {
	case 2:
		return "grid-cols-1 md:grid-cols-2"
	case 4:
		return "grid-cols-1 md:grid-cols-2 lg:grid-cols-4"
	default: // 3
		return "grid-cols-1 md:grid-cols-2 lg:grid-cols-3"
	}
}

// lightboxAriaLabel builds an accessible button label for each gallery entry.
func lightboxAriaLabel(index int, caption string) string {
	if caption != "" {
		return "Open photograph: " + caption
	}
	return "Open photograph " + intToString(index+1)
}

// intToString avoids importing strconv into a templ-generated file.
func intToString(n int) string {
	if n == 0 {
		return "0"
	}
	neg := false
	if n < 0 {
		neg = true
		n = -n
	}
	var b [20]byte
	i := len(b)
	for n > 0 {
		i--
		b[i] = byte('0' + n%10)
		n /= 10
	}
	if neg {
		i--
		b[i] = '-'
	}
	return string(b[i:])
}