/**
 * /d/<docId> — Document view (Sonnet 4.6 agentic chunks v0.2.0, the only view).
 *
 * Server component loads chunks from disk; client component <DocRendererV2>
 * provides language + flow/paged toggles, image crops on-demand, table CSVs.
 */
import Link from "next/link";
import { notFound } from "next/navigation";
import { readChunksByPage, readIndex, hasChunks, readReadingVersion } from "@/lib/chunks";
import { readDocument } from "@/lib/wiki";
import { pickPitch } from "@/lib/doc-summary";
import { getLocale } from "@/components/locale-toggle";
import { AuthBar } from "@/components/auth-bar";
import { ChatBubble } from "@/components/chat-bubble";
import { DocReadingView } from "@/components/doc-reading-view";
import { MarkdownBody } from "@/components/markdown-body";

export const dynamic = "force-dynamic";

export default async function DocPage({
  params,
}: {
  params: Promise<{ docId: string }>;
}) {
  const { docId } = await params;
  const locale = await getLocale();

  if (!(await hasChunks(docId))) {
    return (
      <main className="min-h-screen p-6 md:p-10 max-w-4xl mx-auto">
        <div className="flex items-start justify-between gap-4 mb-6">
          <Link href="/" className="font-mono text-xs text-[#7fdbff] hover:text-[#00ff9c]">
            ← home
          </Link>
          <AuthBar />
        </div>
        <div className="border border-[rgba(255,165,0,0.30)] bg-[rgba(255,165,0,0.05)] rounded p-6">
          <h1 className="font-mono text-lg text-[#ffa500] mb-2">▍ Documento ainda não processado</h1>
          <p className="text-[#c8d4e6] text-sm">
            Este documento ainda não foi indexado.
          </p>
          <p className="font-mono text-xs text-[#5a6678] mt-4">doc_id: {docId}</p>
        </div>
      </main>
    );
  }

  const [idx, byPage, doc, reading] = await Promise.all([
    readIndex(docId),
    readChunksByPage(docId),
    readDocument(docId),
    readReadingVersion(docId),
  ]);
  if (!idx) notFound();

  const ordered: Array<[number, typeof byPage extends Map<number, infer V> ? V : never]> =
    Array.from(byPage.entries()).sort((a, b) => a[0] - b[0]);

  const pitch = pickPitch(
    doc?.fm as Record<string, unknown> | undefined,
    locale === "en" ? "en" : "pt",
  );

  // Histogram chunk types
  const typeCounts = new Map<string, number>();
  for (const entry of idx.chunks ?? []) {
    typeCounts.set(entry.type, (typeCounts.get(entry.type) || 0) + 1);
  }
  const topTypes = Array.from(typeCounts.entries())
    .sort((a, b) => b[1] - a[1])
    .slice(0, 6);

  // Count UFO/cryptid anomalies across chunks
  let ufoCount = 0;
  let cryptidCount = 0;
  let imageCount = 0;
  for (const [, chunks] of byPage) {
    for (const c of chunks) {
      if (c.fm.ufo_anomaly_detected) ufoCount++;
      if (c.fm.cryptid_anomaly_detected) cryptidCount++;
      if (c.fm.type === "image") imageCount++;
    }
  }

  const classification = (doc?.fm.highest_classification as string) ?? "—";
  const collection = (doc?.fm.collection as string) ?? "—";

  return (
    <main className="min-h-screen p-6 md:p-10 max-w-5xl mx-auto">
      <div className="flex items-start justify-between gap-4 mb-6">
        <Link href="/" className="font-mono text-xs text-[#7fdbff] hover:text-[#00ff9c]">
          ← home
        </Link>
        <AuthBar />
      </div>

      <header className="mb-6 pb-6 border-b border-[rgba(0,255,156,0.32)]">
        <div className="font-mono text-[10px] text-[#5a6678] tracking-widest uppercase mb-2 flex items-center gap-2 flex-wrap">
          <span className="px-2 py-0.5 border border-[#ff3344] text-[#ff3344] rounded">
            {classification}
          </span>
          <span>· {collection}</span>
          <span>· doc_id: <span className="text-[#7fdbff]">{docId}</span></span>
        </div>
        <h1 className="font-mono text-3xl text-[#00ff9c] mb-3">
          ▍ {(doc?.fm.canonical_title as string) ?? docId}
        </h1>

        {pitch && (
          <div className="mt-4 mb-4 p-4 border-l-4 border-[#7fdbff] bg-[rgba(127,219,255,0.04)]">
            <div className="text-[15px] leading-relaxed text-[#c8d4e6] markdown-body">
              <MarkdownBody>{pitch}</MarkdownBody>
            </div>
          </div>
        )}

        <div className="flex flex-wrap items-center gap-4 mt-4 font-mono text-xs text-[#8896aa]">
          <span><span className="text-[#7fdbff]">{idx.total_pages}</span> páginas</span>
          <span><span className="text-[#00ff9c]">{idx.total_chunks}</span> trechos</span>
          {imageCount > 0 && <span><span className="text-[#a78bfa]">{imageCount}</span> imagens</span>}
          {ufoCount > 0 && <span><span className="text-[#ff3344]">🛸 {ufoCount}</span> UAP flags</span>}
          {cryptidCount > 0 && <span><span className="text-[#9b5de5]">{cryptidCount}</span> cryptid</span>}
        </div>

        {topTypes.length > 0 && (
          <div className="mt-3 flex flex-wrap gap-1.5 font-mono text-[10px]">
            {topTypes.map(([t, n]) => (
              <span
                key={t}
                className="px-2 py-0.5 border border-[rgba(127,219,255,0.20)] text-[#8896aa] rounded"
              >
                {t} <span className="text-[#7fdbff]">{n}</span>
              </span>
            ))}
          </div>
        )}
      </header>

      <DocReadingView docId={docId} reading={reading} chunksByPage={ordered} />

      <ChatBubble context={{ doc_id: docId }} />
    </main>
  );
}
