/**
 * /bureau — Investigation Bureau hub.
 *
 * Full listing of every artefact: evidence, hypotheses, contradictions,
 * witnesses, outliers, case reports, recent jobs. Each anchor-section
 * matches the hash-links from the homepage's counter row.
 */
import Link from "next/link";
import { pgQuery } from "@/lib/retrieval/db";
import { AuthBar } from "@/components/auth-bar";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

interface EvidenceRow {
  evidence_id: string;
  grade: string;
  verbatim_excerpt: string;
  source_page_id: string;
  confidence_band: string | null;
}
interface HypothesisRow {
  hypothesis_id: string;
  question: string;
  position: string;
  prior: number | string | null;
  posterior: number | string | null;
  confidence_band: string | null;
  status: string;
  reviewed_by: string | null;
  created_at: string;
}
interface ContradictionRow {
  contradiction_id: string;
  topic: string;
  resolution_status: string;
  chunks: unknown;
}
interface GapRow {
  gap_id: string;
  description: string;
  scope: unknown;
  status: string;
  suggested_next_move: string | null;
}
interface WitnessRow {
  witness_id: string;
  canonical_name: string | null;
  entity_id: string | null;
  credibility: string | null;
  verdict: string | null;
}
interface JobRow {
  job_id: string;
  kind: string;
  status: string;
  payload: Record<string, unknown> | null;
  created_at: string;
  finished_at: string | null;
  triggered_by: string | null;
}

const BAND_TONE: Record<string, string> = {
  high: "text-[#06d6a0] border-[#06d6a0]",
  medium: "text-[#3fde6a] border-[#3fde6a]",
  low: "text-[#ffa500] border-[#ffa500]",
  speculation: "text-[#ff6ec7] border-[#ff6ec7]",
};

const GRADE_TONE: Record<string, string> = {
  A: "text-[#06d6a0] border-[#06d6a0]",
  B: "text-[#3fde6a] border-[#3fde6a]",
  C: "text-[#ffa500] border-[#ffa500]",
};

export default async function BureauPage() {
  // All artefacts. Server component — single round per query, no n+1.
  const [hyp, ev, ctr, gap, wit, jobs] = await Promise.all([
    pgQuery<HypothesisRow>(
      `SELECT hypothesis_id, question, position, prior, posterior, confidence_band,
              status, reviewed_by, created_at
         FROM public.hypotheses ORDER BY created_at DESC LIMIT 100`,
    ).catch(() => []),
    pgQuery<EvidenceRow>(
      `SELECT evidence_id, grade, verbatim_excerpt, source_page_id, confidence_band
         FROM public.evidence ORDER BY created_at DESC LIMIT 100`,
    ).catch(() => []),
    pgQuery<ContradictionRow>(
      `SELECT contradiction_id, topic, resolution_status, chunks
         FROM public.contradictions ORDER BY created_at DESC LIMIT 100`,
    ).catch(() => []),
    pgQuery<GapRow>(
      `SELECT gap_id, description, scope, status, suggested_next_move
         FROM public.gaps ORDER BY created_at DESC LIMIT 100`,
    ).catch(() => []),
    pgQuery<WitnessRow>(
      `SELECT w.witness_id, e.canonical_name, e.entity_id, w.credibility, w.verdict
         FROM public.witnesses w
    LEFT JOIN public.entities e ON e.entity_pk = w.person_entity_pk
        ORDER BY w.created_at DESC LIMIT 100`,
    ).catch(() => []),
    pgQuery<JobRow>(
      `SELECT job_id, kind, status, payload, created_at, finished_at, triggered_by
         FROM public.investigation_jobs ORDER BY created_at DESC LIMIT 25`,
    ).catch(() => []),
  ]);

  const { readdir, stat, readFile } = await import("node:fs/promises");
  const path = await import("node:path");
  const reportsDir = path.join(process.env.CASE_ROOT || "/data/ufo/case", "reports");
  let reports: Array<{ slug: string; topic: string; mtimeMs: number; n_evidence: number; n_hypotheses: number }> = [];
  try {
    const files = await readdir(reportsDir);
    const items = await Promise.all(
      files.filter((f) => f.endsWith(".md")).map(async (f) => {
        const full = path.join(reportsDir, f);
        const st = await stat(full);
        const head = (await readFile(full, "utf-8")).slice(0, 2000);
        const topicMatch = head.match(/topic:\s*"([^"]+)"/);
        const eMatch = head.match(/n_evidence:\s*(\d+)/);
        const hMatch = head.match(/n_hypotheses:\s*(\d+)/);
        return {
          slug: f.replace(/\.md$/, ""),
          topic: topicMatch?.[1] ?? f,
          mtimeMs: st.mtimeMs,
          n_evidence: Number(eMatch?.[1] ?? 0),
          n_hypotheses: Number(hMatch?.[1] ?? 0),
        };
      }),
    );
    reports = items.sort((a, b) => b.mtimeMs - a.mtimeMs);
  } catch { /* fine */ }

  return (
    <div className="min-h-screen bg-[#0a0e1a] text-[#e7ecf3]">
      <AuthBar />
      <div className="mx-auto max-w-6xl px-4 py-8 pt-16">
        <div className="text-[11px] text-[#5a6678] font-mono mb-2">
          <Link href="/" className="hover:text-[#7fdbff]">disclosure.top</Link>
          <span className="mx-1">/</span>
          <span className="text-[#e0c080]">bureau</span>
        </div>

        <header className="mb-8 border-b border-[rgba(224,192,128,0.32)] pb-4">
          <h1 className="font-mono text-3xl text-[#e0c080]">▍ The Investigation Bureau</h1>
          <p className="text-[#8896aa] text-sm mt-1">
            Live case folder · {ev.length} evidence · {hyp.length} hypotheses · {ctr.length} contradictions ·{" "}
            {wit.length} witnesses · {gap.length} outliers · {reports.length} reports
          </p>
        </header>

        {/* Case reports */}
        <Section id="reports" title="Case reports" color="text-[#e0c080]">
          {reports.length === 0 ? <Empty /> : reports.map((r) => (
            <Link key={r.slug} href={`/c/${r.slug}`} className="block rounded border border-[rgba(224,192,128,0.18)] bg-[#0d1220] p-3 hover:bg-[rgba(224,192,128,0.04)] mb-2">
              <div className="text-[10px] font-mono text-[#5a6678]">/c/{r.slug}</div>
              <div className="text-[14px] text-[#e7ecf3] font-medium mt-1">{r.topic}</div>
              <div className="text-[10px] font-mono text-[#5a6678] mt-1">
                {r.n_hypotheses} hypotheses · {r.n_evidence} evidence
              </div>
            </Link>
          ))}
        </Section>

        {/* Hypotheses */}
        <Section id="hypotheses" title="Hypotheses" color="text-[#7fdbff]">
          {hyp.length === 0 ? <Empty /> : hyp.map((h) => {
            const post = h.posterior !== null ? Number(h.posterior) : null;
            const prior = h.prior !== null ? Number(h.prior) : null;
            const delta = post !== null && prior !== null ? post - prior : null;
            const bandTone = (h.confidence_band && BAND_TONE[h.confidence_band]) || "text-[#9aa6b8] border-[#9aa6b8]";
            return (
              <Link key={h.hypothesis_id} href={`/h/${h.hypothesis_id}`}
                className="block rounded border border-[rgba(127,219,255,0.18)] bg-[#0d1220] p-3 hover:bg-[rgba(127,219,255,0.04)] mb-2">
                <div className="flex items-baseline justify-between gap-2 mb-1 flex-wrap">
                  <span className="text-[10px] font-mono text-[#5a6678]">{h.hypothesis_id} · {h.status}</span>
                  <div className="flex items-center gap-1">
                    {h.confidence_band && (
                      <span className={`px-1.5 py-0.5 rounded text-[10px] font-mono uppercase border ${bandTone}`}>{h.confidence_band}</span>
                    )}
                    {h.reviewed_by && (
                      <span className="text-[9px] font-mono text-[#ff3344]">↳ {h.reviewed_by}</span>
                    )}
                  </div>
                </div>
                <div className="text-[13px] text-[#e7ecf3] leading-snug">{h.position}</div>
                <div className="text-[10px] font-mono text-[#5a6678] mt-1">
                  prior {prior?.toFixed(2) ?? "—"} → posterior {post?.toFixed(2) ?? "—"}
                  {delta !== null && <span className={delta > 0 ? " text-[#06d6a0]" : delta < 0 ? " text-[#ff6ec7]" : ""}> · Δ {delta >= 0 ? "+" : ""}{delta.toFixed(3)}</span>}
                </div>
              </Link>
            );
          })}
        </Section>

        {/* Evidence */}
        <Section id="evidence" title="Evidence" color="text-[#06d6a0]">
          {ev.length === 0 ? <Empty /> : ev.map((e) => {
            const tone = (e.grade && GRADE_TONE[e.grade]) || "text-[#9aa6b8] border-[#9aa6b8]";
            return (
              <div key={e.evidence_id} className="rounded border border-[rgba(6,214,160,0.18)] bg-[#0d1220] p-3 mb-2">
                <div className="flex items-baseline justify-between gap-2 mb-1">
                  <span className="text-[10px] font-mono text-[#5a6678]">{e.evidence_id} · {e.source_page_id}</span>
                  <span className={`px-1.5 py-0.5 rounded text-[10px] font-mono uppercase border ${tone}`}>Grade {e.grade}</span>
                </div>
                <blockquote className="text-[12px] text-[#cbd2dd] italic border-l-2 border-[#06d6a0] pl-2 mt-1">
                  “{e.verbatim_excerpt}”
                </blockquote>
              </div>
            );
          })}
        </Section>

        {/* Contradictions */}
        <Section id="contradictions" title="Contradictions" color="text-[#ff8a4d]">
          {ctr.length === 0 ? <Empty /> : ctr.map((c) => {
            const n = Array.isArray(c.chunks) ? c.chunks.length : 0;
            return (
              <div key={c.contradiction_id} className="rounded border border-[rgba(255,138,77,0.18)] bg-[#0d1220] p-3 mb-2">
                <div className="flex items-baseline justify-between gap-2 mb-1">
                  <span className="text-[10px] font-mono text-[#5a6678]">{c.contradiction_id}</span>
                  <span className="text-[10px] font-mono text-[#9aa6b8]">{n} positions · {c.resolution_status}</span>
                </div>
                <div className="text-[13px] text-[#e7ecf3] leading-snug">{c.topic}</div>
              </div>
            );
          })}
        </Section>

        {/* Outliers */}
        <Section id="outliers" title="Outliers" color="text-[#ffd23f]">
          {gap.length === 0 ? <Empty /> : gap.map((g) => {
            const s = (g.scope ?? {}) as Record<string, unknown>;
            const title = (s.title as string) || g.description;
            const isOutlier = s.kind === "outlier";
            return (
              <div key={g.gap_id} className="rounded border border-[rgba(255,210,63,0.25)] bg-[#0d1220] p-3 mb-2">
                <div className="flex items-baseline justify-between gap-2 mb-1">
                  <span className="text-[10px] font-mono text-[#5a6678]">{g.gap_id}{isOutlier && " · outlier"}</span>
                  <span className="text-[10px] font-mono text-[#9aa6b8]">{g.status}</span>
                </div>
                <div className="text-[13px] text-[#e7ecf3] leading-snug">{title}</div>
                {s.why_surprising !== undefined && (
                  <div className="text-[11px] text-[#cbd2dd] mt-1 leading-relaxed">{String(s.why_surprising)}</div>
                )}
                {g.suggested_next_move && (
                  <div className="text-[10px] font-mono text-[#06d6a0] mt-1">→ {g.suggested_next_move}</div>
                )}
              </div>
            );
          })}
        </Section>

        {/* Witnesses */}
        <Section id="witnesses" title="Witness analyses" color="text-[#9b5de5]">
          {wit.length === 0 ? <Empty /> : wit.map((w) => (
            <div key={w.witness_id} className="rounded border border-[rgba(155,93,229,0.18)] bg-[#0d1220] p-3 mb-2">
              <div className="flex items-baseline justify-between gap-2 mb-1">
                <span className="text-[10px] font-mono text-[#5a6678]">{w.witness_id}</span>
                <span className="text-[10px] font-mono text-[#9b5de5]">{w.credibility ?? "—"}</span>
              </div>
              <div className="text-[13px] text-[#e7ecf3] font-medium">
                {w.entity_id ? <Link href={`/e/people/${w.entity_id}`} className="hover:underline">{w.canonical_name ?? w.entity_id}</Link> : (w.canonical_name ?? "—")}
              </div>
              {w.verdict && <blockquote className="text-[12px] text-[#cbd2dd] italic mt-1 border-l-2 border-[#9b5de5] pl-2">{w.verdict}</blockquote>}
            </div>
          ))}
        </Section>

        {/* Recent jobs */}
        <Section id="jobs" title="Recent investigation jobs" color="text-[#9aa6b8]">
          {jobs.length === 0 ? <Empty /> : (
            <div className="rounded border border-[rgba(127,219,255,0.08)] bg-[#0d1220] overflow-hidden">
              <table className="w-full text-[11px] font-mono">
                <thead className="text-[#5a6678] border-b border-[rgba(127,219,255,0.1)]">
                  <tr>
                    <th className="text-left px-3 py-2">job</th>
                    <th className="text-left px-3 py-2">kind</th>
                    <th className="text-left px-3 py-2">status</th>
                    <th className="text-left px-3 py-2">created</th>
                  </tr>
                </thead>
                <tbody>
                  {jobs.map((j) => (
                    <tr key={j.job_id} className="border-t border-[rgba(127,219,255,0.04)] hover:bg-[rgba(127,219,255,0.03)]">
                      <td className="px-3 py-2">
                        <Link href={`/jobs/${j.job_id}`} className="text-[#7fdbff] hover:underline">{j.job_id.slice(0, 8)}…</Link>
                      </td>
                      <td className="px-3 py-2 text-[#cbd2dd]">{j.kind}</td>
                      <td className={`px-3 py-2 ${
                        j.status === "complete" ? "text-[#06d6a0]" :
                        j.status === "failed"   ? "text-[#ff6ec7]" :
                        j.status === "running"  ? "text-[#ffd23f]" :
                                                  "text-[#9aa6b8]"
                      }`}>{j.status}</td>
                      <td className="px-3 py-2 text-[#5a6678]">{new Date(j.created_at).toLocaleString("pt-BR")}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </Section>
      </div>
    </div>
  );
}

function Section({ id, title, color, children }: { id: string; title: string; color: string; children: React.ReactNode }) {
  return (
    <section id={id} className="mb-10 scroll-mt-20">
      <h2 className={`font-mono text-xs uppercase tracking-[0.18em] ${color} mb-3`}>// {title}</h2>
      <div>{children}</div>
    </section>
  );
}

function Empty() {
  return <div className="text-[11px] font-mono text-[#5a6678]">_(none yet)_</div>;
}
