// app/builds/[buildId]/page.tsx
import Link from "next/link";
import { notFound } from "next/navigation";

const API_BASE_URL =
  process.env.NEXT_PUBLIC_API_BASE_URL ?? "";

function formatMoney(n?: number | null) {
  if (n == null) return "—";
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
    maximumFractionDigits: 0,
  }).format(n);
}

function timeAgo(iso?: string | null) {
  if (!iso) return "";
  const d = new Date(iso);
  const diff = Math.max(0, Date.now() - d.getTime());
  const mins = Math.floor(diff / 60000);
  if (mins < 60) return `${mins}m ago`;
  const hrs = Math.floor(mins / 60);
  if (hrs < 24) return `${hrs}h ago`;
  const days = Math.floor(hrs / 24);
  return `${days}d ago`;
}

export default async function BuildBreakdownPage({
  params,
}: {
  params: Promise<{ buildId: string }>;
}) {
  const { buildId } = await params;

  // Public detail endpoint - use Next.js API route
  const baseUrl = process.env.NEXT_PUBLIC_APP_URL || 'http://localhost:3000';
  const res = await fetch(`${baseUrl}/api/builds/public/${buildId}`, {
    cache: "no-store",
  });

  if (res.status === 404) return notFound();

  const build = await res.json().catch(() => null);
  if (!build) return notFound();

  const items: any[] = build.items ?? [];

  const total = items.reduce((sum, it) => {
    const qty = Number(it.quantity ?? 1);
    const price = it.bestPrice == null ? 0 : Number(it.bestPrice);
    return sum + qty * price;
  }, 0);

  const images: any[] = build.images ?? build.photos ?? build.media ?? [];

  return (
    <main className="mx-auto max-w-6xl px-4 py-8">
      {/* Header crumb */}
      <div className="flex items-center justify-between">
        <Link
          href="/builds"
          className="text-sm text-zinc-400 hover:text-zinc-200"
        >
          ← Back to Community Builds
        </Link>

        <div className="flex items-center gap-2 text-[11px] text-zinc-500">
          <span className="rounded-full border border-zinc-800 bg-zinc-950 px-2 py-0.5">
            Public Build
          </span>
          {build.updatedAt && (
            <span className="hidden md:inline">
              updated {timeAgo(build.updatedAt)}
            </span>
          )}
        </div>
      </div>

      {/* Layout */}
      <div className="mt-6 grid grid-cols-1 gap-6 lg:grid-cols-[1fr_320px]">
        {/* Post column */}
        <div className="space-y-4">
          {/* “Reddit-ish” Post Card */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60">
            <div className="flex">
              {/* Vote rail */}
              <div className="flex w-12 flex-col items-center gap-2 border-r border-zinc-900 bg-black/20 py-4 text-zinc-500">
                <button className="rounded-md px-2 py-1 hover:bg-zinc-900 hover:text-amber-300">
                  ▲
                </button>
                <div className="text-xs font-semibold text-zinc-400">—</div>
                <button className="rounded-md px-2 py-1 hover:bg-zinc-900 hover:text-amber-300">
                  ▼
                </button>
              </div>

              {/* Post body */}
              <div className="flex-1 p-5">
                {/* Meta */}
                <div className="flex flex-wrap items-center gap-x-2 gap-y-1 text-[11px] text-zinc-500">
                  <span className="rounded-full border border-amber-500/30 bg-amber-500/10 px-2 py-0.5 text-amber-300">
                    r/BattlBuilders
                  </span>
                  <span>•</span>
                  <span>posted by</span>
                  <span className="text-zinc-300">u/anonymous</span>
                  {build.createdAt && (
                    <>
                      <span>•</span>
                      <span>{timeAgo(build.createdAt)}</span>
                    </>
                  )}
                </div>

                {/* Title */}
                <h1 className="mt-3 text-2xl font-semibold tracking-tight text-zinc-50">
                  {build.title ?? "Untitled Build"}
                </h1>

                {/* Description */}
                {build.description ? (
                  <p className="mt-2 text-sm text-zinc-300/90">
                    {build.description}
                  </p>
                ) : (
                  <p className="mt-2 text-sm text-zinc-500">
                    {/* placeholder copy */}
                    Field notes coming soon. This build breakdown will include
                    purpose, tradeoffs, and why each part made the cut.
                  </p>
                )}

                {/* Action bar */}
                <div className="mt-4 flex flex-wrap items-center gap-2 text-xs">
                  <button className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-zinc-300 hover:border-amber-500/40 hover:text-amber-300">
                    Comment
                  </button>
                  <button className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-zinc-300 hover:border-amber-500/40 hover:text-amber-300">
                    Share
                  </button>
                  <button className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-zinc-300 hover:border-amber-500/40 hover:text-amber-300">
                    Save
                  </button>

                  <div className="ml-auto flex items-center gap-2 text-zinc-500">
                    <span className="hidden sm:inline">Est. Total</span>
                    <span className="rounded-md border border-zinc-800 bg-black/30 px-2 py-1 text-zinc-200">
                      {formatMoney(total)}
                    </span>
                  </div>
                </div>
              </div>
            </div>
          </div>

          {/* Parts card */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60 p-5">
            <div className="flex items-center justify-between">
              <h2 className="text-sm font-semibold text-zinc-200">Parts</h2>
              <div className="text-xs text-zinc-500">{items.length} items</div>
            </div>

            <div className="mt-4 space-y-2">
              {items.map((it) => (
                <div
                  key={it.uuid ?? it.id}
                  className="flex items-center gap-3 rounded-lg border border-zinc-900 bg-black/30 px-3 py-3"
                >
                  {/* Thumb */}
                  <div className="h-12 w-12 flex-none overflow-hidden rounded-md border border-zinc-800 bg-zinc-950">
                    {it.productImageUrl ? (
                      // eslint-disable-next-line @next/next/no-img-element
                      <img
                        src={it.productImageUrl}
                        alt={it.productName ?? "Part image"}
                        className="h-full w-full object-cover"
                      />
                    ) : (
                      <div className="flex h-full w-full items-center justify-center text-[10px] text-zinc-600">
                        IMG
                      </div>
                    )}
                  </div>

                  {/* Info */}
                  <div className="min-w-0 flex-1">
                    <div className="truncate text-sm text-zinc-100">
                      {it.productName ?? "Part"}
                    </div>
                    <div className="mt-0.5 flex flex-wrap items-center gap-2 text-[11px] text-zinc-500">
                      <span className="rounded-md border border-zinc-800 bg-black/20 px-1.5 py-0.5">
                        {it.slot ?? "slot"}
                      </span>
                      {it.productBrand && <span>{it.productBrand}</span>}
                      <span className="text-zinc-600">•</span>
                      <span>x{it.quantity ?? 1}</span>
                    </div>
                  </div>

                  {/* Price */}
                  <div className="flex flex-col items-end gap-1">
                    <div className="text-sm font-medium text-zinc-200">
                      {formatMoney(it.bestPrice)}
                    </div>
                    <button className="text-[11px] text-amber-300/90 hover:text-amber-200">
                      View part →
                    </button>
                  </div>
                </div>
              ))}
            </div>
          </div>

          {/* Gallery */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60 p-5">
                <div className="flex items-center justify-between">
                  <h2 className="text-sm font-semibold text-zinc-200">
                    Gallery
                  </h2>
                  <span className="text-xs text-zinc-500">user submitted</span>
                </div>
                {images.length === 0 ? (
                  <div className="mt-4 rounded-lg border border-dashed border-zinc-800 bg-black/20 p-4">
                    <p className="text-sm text-zinc-400">
                      No photos yet. Be the first to add a build pic.
                    </p>
                    <p className="mt-1 text-[11px] text-zinc-600">
                      (Upload UI coming soon — we’ll store and moderate images
                      per build.)
                    </p>

                    {/* Mock thumbnails */}
                    <div className="mt-4 grid grid-cols-3 gap-2 sm:grid-cols-4">
                      {Array.from({ length: 8 }).map((_, i) => (
                        <div
                          key={i}
                          className="aspect-square rounded-md border border-zinc-800 bg-zinc-950 flex items-center justify-center text-[10px] text-zinc-600"
                        >
                          IMG
                        </div>
                      ))}
                    </div>

                    <button
                      className="mt-4 rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-sm text-zinc-200 hover:border-amber-500/40 hover:text-amber-300"
                      disabled
                      title="Upload UI coming soon"
                    >
                      Add Photo (coming soon)
                    </button>
                  </div>
                ) : (
                  <div className="mt-4">
                    {/* “Hero” preview */}
                    <div className="aspect-[16/9] overflow-hidden rounded-lg border border-zinc-900 bg-black/30">
                      {/* eslint-disable-next-line @next/next/no-img-element */}
                      <img
                        src={images[0].url ?? images[0]}
                        alt="Build photo"
                        className="h-full w-full object-cover"
                      />
                    </div>

                    {/* Thumbs */}
                    <div className="mt-3 grid grid-cols-4 gap-2 sm:grid-cols-6">
                      {images.slice(0, 12).map((img, idx) => (
                        <div
                          key={img.uuid ?? img.id ?? idx}
                          className="aspect-square overflow-hidden rounded-md border border-zinc-900 bg-black/30"
                        >
                          {/* eslint-disable-next-line @next/next/no-img-element */}
                          <img
                            src={img.thumbUrl ?? img.url ?? img}
                            alt={`Build photo ${idx + 1}`}
                            className="h-full w-full object-cover"
                          />
                        </div>
                      ))}
                    </div>

                    <div className="mt-4 flex flex-wrap items-center gap-2 text-xs">
                      <button className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-zinc-200 hover:border-amber-500/40 hover:text-amber-300">
                        View all
                      </button>
                      <button
                        className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-zinc-200 hover:border-amber-500/40 hover:text-amber-300"
                        disabled
                        title="Upload UI coming soon"
                      >
                        Add Photo
                      </button>
                      <span className="ml-auto text-[11px] text-zinc-600">
                        {images.length} photos
                      </span>
                    </div>
                  </div>
                )}
              </div>

          {/* Comments (placeholder) */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60 p-5">
            <div className="flex items-center justify-between">
              <h2 className="text-sm font-semibold text-zinc-200">Comments</h2>
              <span className="text-xs text-zinc-500">mocked</span>
            </div>

            <div className="mt-4 space-y-4">
              {[
                {
                  user: "u/gearhead",
                  body: "Solid parts list. Any reason you went with that upper over a BCM?",
                },
                {
                  user: "u/OP",
                  body: "Mostly availability + price. I’ll probably swap once I track deals for a week.",
                },
                {
                  user: "u/boltcarrier",
                  body: "Would love to see this with a pinned/weld option for 14.5 builds.",
                },
              ].map((c, idx) => (
                <div key={idx} className="flex gap-3">
                  <div className="mt-1 h-6 w-6 rounded-full bg-zinc-900 text-[10px] text-zinc-300 flex items-center justify-center">
                    {c.user === "u/OP" ? "OP" : "u"}
                  </div>
                  <div className="flex-1">
                    <div className="text-[11px] text-zinc-500">
                      <span className="text-zinc-300">{c.user}</span> • 1h ago
                    </div>
                    <div className="mt-1 text-sm text-zinc-300/90">
                      {c.body}
                    </div>
                    <div className="mt-2 flex items-center gap-3 text-[11px] text-zinc-500">
                      <button className="hover:text-amber-300">Reply</button>
                      <button className="hover:text-amber-300">Share</button>
                      <button className="hover:text-amber-300">Save</button>
                    </div>
                  </div>
                </div>
              ))}

              <div className="rounded-lg border border-dashed border-zinc-800 bg-black/20 p-4 text-sm text-zinc-500">
                Commenting is coming soon. This will become the “breakdown”
                thread for the build (notes, tradeoffs, deal alerts, revisions).
              </div>
              
            </div>
          </div>
        </div>

        {/* Sidebar */}
        <aside className="space-y-4">
          {/* Build stats */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60 p-5">
            <h3 className="text-xs font-semibold uppercase tracking-[0.18em] text-zinc-500">
              Build Summary
            </h3>

            <div className="mt-3 space-y-2 text-sm">
              <div className="flex items-center justify-between">
                <span className="text-zinc-500">Build ID</span>
                <span className="text-zinc-300">
                  {(build.uuid ?? buildId).slice(0, 8)}…
                </span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-zinc-500">Visibility</span>
                <span className="text-zinc-300">
                  {build.isPublic ? "Public" : "Private"}
                </span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-zinc-500">Items</span>
                <span className="text-zinc-300">{items.length}</span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-zinc-500">Est. Total</span>
                <span className="text-zinc-50 font-medium">
                  {formatMoney(total)}
                </span>
              </div>
            </div>

            <div className="mt-4 flex flex-col gap-2">
              <button className="rounded-md bg-amber-400 px-3 py-2 text-sm font-semibold text-black hover:bg-amber-300 transition">
                Open in Builder
              </button>
              <button className="rounded-md border border-zinc-800 bg-black/30 px-3 py-2 text-sm text-zinc-200 hover:border-amber-500/40 hover:text-amber-300">
                Copy share link
              </button>
            </div>
          </div>

          {/* Placeholder “OP notes” */}
          <div className="rounded-xl border border-zinc-900 bg-zinc-950/60 p-5">
            <h3 className="text-xs font-semibold uppercase tracking-[0.18em] text-zinc-500">
              OP Notes
            </h3>
            <ul className="mt-3 space-y-2 text-sm text-zinc-400">
              <li>• Purpose: home defense / range</li>
              <li>• Priority: reliability first</li>
              <li>• Next upgrades: optic, sling, light</li>
            </ul>
          </div>
        </aside>
      </div>
    </main>
  );
}