---
import BaseLayout from "@/layouts/BaseLayout.astro"
import SiteHeader from "@/components/site-header.astro"
import Footer from "@/components/footer.astro"
import { siteTitleSuffix } from "@/data/site"
import { galleryConfig } from "@/data/gallery"
import { getAlbumCover, scanAlbumPhotos } from "@/lib/gallery"

export function getStaticPaths() {
  return galleryConfig.albums.map((album) => ({ params: { album: album.id } }))
}

const albumId = Astro.params.album as string
const album = galleryConfig.albums.find((a) => a.id === albumId)

if (!album) {
  return Astro.redirect("/404/")
}

const photos = scanAlbumPhotos(album.id)
const cover = getAlbumCover(album, photos)
const columnWidth = galleryConfig.columnWidth || 240

const title = `${album.name} | ${siteTitleSuffix}`
const description = album.description ?? "相册"
---

<BaseLayout {title} {description} fontProfile="interface">
  <div class="min-h-screen bg-background dark:bg-surface-subtle">
    <SiteHeader />
    <main class="pt-20 pb-16">
      {/* 封面横幅 */}
      <section class="relative w-full overflow-hidden">
        {cover ? (
          <div class="relative h-[240px] w-full sm:h-[320px]">
            <img src={cover} alt={album.name} class="h-full w-full object-cover" />
            <div class="absolute inset-0 bg-gradient-to-t from-black/80 via-black/35 to-black/10" />

            <a
              href="/gallery/"
              class="absolute left-4 top-4 rounded-lg bg-black/35 px-3 py-1.5 text-sm text-white/90 backdrop-blur-sm transition-colors hover:bg-black/55 hover:text-white"
            >
              ← 返回相册
            </a>

            <div class="absolute inset-x-0 bottom-0 p-6">
              <div class="mx-auto max-w-6xl">
                <h1 class="mb-2 text-2xl font-bold text-white drop-shadow-lg sm:text-3xl">
                  {album.name}
                </h1>
                {album.description && (
                  <p class="mb-2 max-w-2xl line-clamp-2 text-sm leading-relaxed text-white/75">
                    {album.description}
                  </p>
                )}
                <div class="flex flex-wrap items-center gap-4 text-sm text-white/80">
                  {album.date && <span>🗓 {album.date}</span>}
                  {album.location && <span>📍 {album.location}</span>}
                  <span>🖼 {photos.length} 张</span>
                </div>
                {album.tags && album.tags.length > 0 && (
                  <div class="mt-2.5 flex flex-wrap gap-1.5">
                    {album.tags.map((tag) => (
                      <span class="rounded bg-white/20 px-2 py-0.5 text-xs text-white/90 backdrop-blur-sm">
                        {tag}
                      </span>
                    ))}
                  </div>
                )}
              </div>
            </div>
          </div>
        ) : (
          <div class="mx-auto max-w-6xl px-6 pt-4">
            <a href="/gallery/" class="mb-3 inline-block text-sm text-primary hover:underline">
              ← 返回相册
            </a>
            <h1 class="text-2xl font-bold text-foreground sm:text-3xl">{album.name}</h1>
          </div>
        )}
      </section>

      {/* 瀑布流 */}
      <section class="mx-auto max-w-6xl px-6 pt-8">
        {photos.length > 0 ? (
          <div class="gallery-masonry" style={`--col-width: ${columnWidth}px;`}>
            {photos.map((photo, index) => (
              <button
                type="button"
                data-lightbox-src={photo}
                data-lightbox-index={index}
                aria-label={`查看第 ${index + 1} 张照片`}
                class="gallery-photo mb-3 block w-full cursor-zoom-in overflow-hidden rounded-xl border border-border/50 bg-card p-0"
              >
                <img
                  src={photo}
                  alt=""
                  loading="lazy"
                  decoding="async"
                  class="h-auto w-full object-cover transition-transform duration-300 hover:scale-[1.03]"
                />
              </button>
            ))}
          </div>
        ) : (
          <div class="py-20 text-center text-muted-foreground">
            这个相册还没有照片。往 <code class="rounded bg-secondary px-1.5 py-0.5">public/gallery/{album.id}/</code> 里放图片即可。
          </div>
        )}
      </section>
    </main>
    <Footer />
  </div>
</BaseLayout>

<style is:global>
  .gallery-masonry {
    column-width: var(--col-width, 240px);
    column-gap: 0.75rem;
  }
  .gallery-masonry .gallery-photo {
    break-inside: avoid;
  }
</style>

<script>
  /**
   * 无依赖灯箱。
   * 用事件委托 + 每次打开时重新收集当前页的照片，因此 ClientRouter 切页后依然有效。
   */
  const LB_ID = "vv-lightbox"

  const ensureOverlay = (): HTMLElement => {
    let overlay = document.getElementById(LB_ID)
    if (overlay) return overlay

    overlay = document.createElement("div")
    overlay.id = LB_ID
    overlay.setAttribute("role", "dialog")
    overlay.setAttribute("aria-modal", "true")
    overlay.className =
      "fixed inset-0 z-[100] hidden items-center justify-center bg-black/90 backdrop-blur-sm"
    overlay.innerHTML = `
      <button type="button" data-lb-close aria-label="关闭"
        class="absolute right-4 top-4 z-10 flex h-10 w-10 items-center justify-center rounded-full bg-white/10 text-2xl leading-none text-white/90 transition-colors hover:bg-white/20">×</button>
      <button type="button" data-lb-prev aria-label="上一张"
        class="absolute left-3 z-10 flex h-11 w-11 items-center justify-center rounded-full bg-white/10 text-2xl leading-none text-white/90 transition-colors hover:bg-white/20 sm:left-6">‹</button>
      <button type="button" data-lb-next aria-label="下一张"
        class="absolute right-3 z-10 flex h-11 w-11 items-center justify-center rounded-full bg-white/10 text-2xl leading-none text-white/90 transition-colors hover:bg-white/20 sm:right-6">›</button>
      <img data-lb-img src="" alt="" class="max-h-[88vh] max-w-[92vw] object-contain" />
      <div data-lb-count
        class="absolute bottom-5 left-1/2 -translate-x-1/2 rounded-full bg-white/10 px-3 py-1 font-mono text-xs text-white/80"></div>
    `
    document.body.appendChild(overlay)
    return overlay
  }

  let sources: string[] = []
  let current = 0

  const render = (overlay: HTMLElement) => {
    const img = overlay.querySelector<HTMLImageElement>("[data-lb-img]")
    const counter = overlay.querySelector<HTMLElement>("[data-lb-count]")
    if (img) img.src = sources[current] ?? ""
    if (counter) counter.textContent = `${current + 1} / ${sources.length}`
    const single = sources.length < 2
    for (const sel of ["[data-lb-prev]", "[data-lb-next]"]) {
      const el = overlay.querySelector<HTMLElement>(sel)
      if (el) el.style.display = single ? "none" : ""
    }
  }

  const openAt = (index: number) => {
    const overlay = ensureOverlay()
    current = index
    render(overlay)
    overlay.classList.remove("hidden")
    overlay.classList.add("flex")
    document.body.style.overflow = "hidden"
  }

  const close = () => {
    const overlay = document.getElementById(LB_ID)
    if (!overlay) return
    overlay.classList.add("hidden")
    overlay.classList.remove("flex")
    document.body.style.overflow = ""
  }

  const step = (delta: number) => {
    if (sources.length < 2) return
    current = (current + delta + sources.length) % sources.length
    const overlay = document.getElementById(LB_ID)
    if (overlay) render(overlay)
  }

  if (!(window as unknown as { __vvLightboxBound?: boolean }).__vvLightboxBound) {
    ;(window as unknown as { __vvLightboxBound?: boolean }).__vvLightboxBound = true

    document.addEventListener("click", (event) => {
      const target = event.target as Element | null

      const trigger = target?.closest<HTMLElement>("[data-lightbox-src]")
      if (trigger) {
        // 每次打开都重新收集当前页的照片
        const all = Array.from(document.querySelectorAll<HTMLElement>("[data-lightbox-src]"))
        sources = all.map((el) => el.dataset.lightboxSrc ?? "")
        openAt(Number(trigger.dataset.lightboxIndex ?? all.indexOf(trigger)))
        return
      }

      if (target?.closest("[data-lb-close]")) return close()
      if (target?.closest("[data-lb-prev]")) return step(-1)
      if (target?.closest("[data-lb-next]")) return step(1)

      // 点背景关闭（点图片本身不关）
      const overlay = document.getElementById(LB_ID)
      if (overlay && target === overlay) close()
    })

    document.addEventListener("keydown", (event) => {
      const overlay = document.getElementById(LB_ID)
      if (!overlay || overlay.classList.contains("hidden")) return
      if (event.key === "Escape") close()
      if (event.key === "ArrowLeft") step(-1)
      if (event.key === "ArrowRight") step(1)
    })

    // 切页时收拾干净，避免残留遮罩锁住滚动
    document.addEventListener("astro:page-load", () => {
      const overlay = document.getElementById(LB_ID)
      if (overlay) overlay.remove()
      document.body.style.overflow = ""
    })
  }
</script>