"use client";

// Archive — the call-level view. Until now /calls was a ten-line stub that
// redirected to /incidents, so there was no way to look at a call anywhere in
// the app: the nav's "Archive" link led to the incident list, and a call that
// never correlated was invisible. That is the wrong way round when correlation
// quality is the thing under development — the orphans are the evidence.
//
// Readable by every org member — the Firestore rules already let any member
// read every call in their org. The manual attribution controls stay
// admin-only, matching the admin gate on the link/unlink routes.

import { useCallback, useEffect, useMemo, useState } from "react";
import { useRouter } from "next/navigation";
import { useAuth } from "@/components/AuthProvider";
import { useSystems } from "@/lib/useSystems";
import { useIncidents } from "@/lib/useIncidents";
import { c2api } from "@/lib/c2api";
import type { CallRecord, IncidentRecord } from "@/lib/types";
import { PageHeader } from "@/components/ui/PageHeader";
import { Card } from "@/components/ui/Card";
import { Badge } from "@/components/ui/Badge";
import { Button } from "@/components/ui/Button";
import { EmptyState, ErrorBanner } from "@/components/ui/EmptyState";
import { SkeletonCard } from "@/components/ui/Skeleton";
import { MachineOutputNotice } from "@/components/ui/MachineOutputNotice";

type LinkFilter = "any" | "orphan" | "linked";
type TranscriptFilter = "any" | "yes" | "no";

const LINK_FILTERS: { key: LinkFilter; label: string }[] = [
  { key: "any", label: "All" },
  { key: "orphan", label: "Orphans" },
  { key: "linked", label: "Linked" },
];

const TRANSCRIPT_FILTERS: { key: TranscriptFilter; label: string }[] = [
  { key: "any", label: "Any" },
  { key: "yes", label: "Transcribed" },
  { key: "no", label: "No transcript" },
];

const PAGE_SIZE = 50;

function fmtWhen(iso?: string | null): string {
  if (!iso) return "—";
  try {
    const d = new Date(iso);
    return `${d.toLocaleDateString([], { month: "short", day: "numeric" })} ${d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" })}`;
  } catch {
    return String(iso);
  }
}

function fmtDuration(call: CallRecord): string {
  if (!call.ended_at) return "active";
  const ms = new Date(call.ended_at).getTime() - new Date(call.started_at).getTime();
  const s = Math.max(0, Math.round(ms / 1000));
  return s < 60 ? `${s}s` : `${Math.floor(s / 60)}m${String(s % 60).padStart(2, "0")}`;
}

function callIncidentIds(call: CallRecord): string[] {
  if (call.incident_ids?.length) return call.incident_ids;
  return call.incident_id ? [call.incident_id] : [];
}

/** One archive row: metadata, transcript, audio, and the attribution control. */
function ArchiveRow({
  call,
  systemName,
  incidents,
  canEdit,
  onChanged,
}: {
  call: CallRecord;
  systemName?: string;
  incidents: IncidentRecord[];
  canEdit: boolean;
  onChanged: () => void;
}) {
  const [open, setOpen] = useState(false);
  const [audioUrl, setAudioUrl] = useState<string | null>(null);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [attachTo, setAttachTo] = useState("");

  const linkedIds = callIncidentIds(call);
  const text = call.transcript_corrected || call.transcript || "";

  // The stored document holds only the private gs:// object location; a
  // playable link is minted per read by the API, so fetch it on expand.
  useEffect(() => {
    if (!open || audioUrl) return;
    let cancelled = false;
    c2api
      .getCall(call.call_id)
      .then((full) => { if (!cancelled) setAudioUrl(full.audio_url ?? null); })
      .catch(() => { /* audio is optional — the row is still useful without it */ });
    return () => { cancelled = true; };
  }, [open, audioUrl, call.call_id]);

  async function attach() {
    if (!attachTo) return;
    setBusy(true); setError(null);
    try {
      await c2api.linkCallToIncident(attachTo, call.call_id);
      setAttachTo("");
      onChanged();
    } catch (e) {
      setError(String(e));
    } finally {
      setBusy(false);
    }
  }

  async function detach(incidentId: string) {
    setBusy(true); setError(null);
    try {
      await c2api.unlinkCallFromIncident(incidentId, call.call_id);
      onChanged();
    } catch (e) {
      setError(String(e));
    } finally {
      setBusy(false);
    }
  }

  return (
    <Card padding="none" className="overflow-hidden">
      <button
        onClick={() => setOpen((v) => !v)}
        className="w-full text-left px-4 py-3 hover:bg-raised/40 transition-colors"
      >
        <div className="flex flex-wrap items-center gap-x-3 gap-y-1">
          <span className="text-ink font-mono text-xs shrink-0">{fmtWhen(call.started_at)}</span>
          <span className="text-ink-2 text-sm font-medium truncate">
            {call.talkgroup_name || (call.talkgroup_id ? `TGID ${call.talkgroup_id}` : "unknown talkgroup")}
          </span>
          <span className="text-ink-muted text-xs font-mono">{fmtDuration(call)}</span>
          {linkedIds.length === 0 ? (
            <Badge tone="warning">orphan</Badge>
          ) : (
            <Badge tone="neutral">{linkedIds.length === 1 ? "linked" : `${linkedIds.length} incidents`}</Badge>
          )}
          {!text && <Badge tone="danger">no transcript</Badge>}
          {systemName && <span className="text-ink-muted text-xs ml-auto shrink-0">{systemName}</span>}
        </div>
        {text && !open && (
          <p className="text-ink-muted text-xs mt-1.5 truncate">{text}</p>
        )}
      </button>

      {open && (
        <div className="px-4 pb-4 space-y-3 border-t border-line pt-3">
          {text ? (
            <p className="text-ink-2 text-sm leading-relaxed">{text}</p>
          ) : (
            <p className="text-ink-muted text-xs italic">
              No transcript. Either STT was off when this call landed, or Whisper rejected it as
              silence or degenerate output.
            </p>
          )}

          {audioUrl && (
            /* eslint-disable-next-line jsx-a11y/media-has-caption */
            <audio controls src={audioUrl} className="w-full h-9" />
          )}

          <dl className="grid grid-cols-2 sm:grid-cols-4 gap-x-4 gap-y-1 text-xs">
            <div><dt className="text-ink-muted inline">call </dt><dd className="text-ink-2 font-mono inline">{call.call_id.slice(0, 8)}</dd></div>
            <div><dt className="text-ink-muted inline">node </dt><dd className="text-ink-2 font-mono inline">{call.node_id ?? "—"}</dd></div>
            <div><dt className="text-ink-muted inline">tgid </dt><dd className="text-ink-2 font-mono inline">{call.talkgroup_id ?? "—"}</dd></div>
            <div><dt className="text-ink-muted inline">path </dt><dd className="text-ink-2 font-mono inline">{call.corr_path ?? "—"}</dd></div>
          </dl>

          {/* Manual attribution */}
          <div className="space-y-2">
            {linkedIds.map((id) => {
              const inc = incidents.find((i) => i.incident_id === id);
              return (
                <div key={id} className="flex items-center gap-2 text-xs">
                  <span className="text-ink-muted">attached to</span>
                  <span className="text-ink-2 truncate">{inc?.title ?? id.slice(0, 8)}</span>
                  {canEdit && <button
                    onClick={() => detach(id)}
                    disabled={busy}
                    className="text-sev-major hover:underline disabled:opacity-50 shrink-0"
                  >
                    detach
                  </button>}
                </div>
              );
            })}

            {canEdit && <div className="flex flex-wrap items-center gap-2">
              <select
                value={attachTo}
                onChange={(e) => setAttachTo(e.target.value)}
                className="bg-surface border border-line rounded-md text-xs text-ink px-2 py-1.5 max-w-xs"
              >
                <option value="">Attach to incident…</option>
                {incidents
                  .filter((i) => !linkedIds.includes(i.incident_id))
                  .slice(0, 100)
                  .map((i) => (
                    <option key={i.incident_id} value={i.incident_id}>
                      {fmtWhen(i.started_at)} — {i.title}
                    </option>
                  ))}
              </select>
              <Button size="sm" variant="secondary" onClick={attach} disabled={!attachTo || busy}>
                {busy ? "Saving…" : "Attach"}
              </Button>
            </div>}
          </div>

          {error && <ErrorBanner message={error} />}
        </div>
      )}
    </Card>
  );
}

export default function ArchivePage() {
  const { user, orgId, isAdmin, loading: authLoading } = useAuth();
  const router = useRouter();
  const canView = Boolean(user && (orgId || isAdmin));
  const { systems } = useSystems();
  const { incidents } = useIncidents(200);

  const [calls, setCalls] = useState<CallRecord[]>([]);
  const [cursor, setCursor] = useState<string | null>(null);
  const [moreAvailable, setMoreAvailable] = useState(false);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const [link, setLink] = useState<LinkFilter>("any");
  const [transcript, setTranscript] = useState<TranscriptFilter>("any");
  const [systemId, setSystemId] = useState("");
  const [q, setQ] = useState("");
  const [submittedQ, setSubmittedQ] = useState("");

  useEffect(() => {
    if (!authLoading && !canView) router.replace("/");
  }, [authLoading, canView, router]);

  const load = useCallback(
    async (nextCursor: string | null, append: boolean) => {
      setLoading(true);
      setError(null);
      try {
        const res = await c2api.searchCalls({
          limit: PAGE_SIZE,
          cursor: nextCursor,
          link,
          transcript,
          system_id: systemId || undefined,
          q: submittedQ || undefined,
        });
        setCalls((prev) => (append ? [...prev, ...res.calls] : res.calls));
        setCursor(res.next_cursor);
        setMoreAvailable(Boolean(res.next_cursor));
      } catch (e) {
        setError(String(e));
      } finally {
        setLoading(false);
      }
    },
    [link, transcript, systemId, submittedQ],
  );

  // Reload from the top whenever a filter changes.
  useEffect(() => {
    if (authLoading || !canView) return;
    load(null, false);
  }, [authLoading, canView, load]);

  const systemName = useMemo(() => {
    const m = new Map(systems.map((s) => [s.system_id, s.name]));
    return (id?: string | null) => (id ? m.get(id) : undefined);
  }, [systems]);

  // Every hook runs before this guard — see the note in app/nodes/page.tsx.
  if (authLoading || !canView) return null;

  const orphanCount = calls.filter((c) => callIncidentIds(c).length === 0).length;
  const noTranscript = calls.filter((c) => !(c.transcript_corrected || c.transcript)).length;

  return (
    <div className="space-y-6">
      <PageHeader
        title="Archive"
        description={isAdmin
          ? "Every call on the account, correlated or not. Attach an orphan to the incident it belongs to, or detach one the correlator got wrong."
          : "Every call on the account, correlated or not."}
      />

      <div className="flex flex-wrap items-center gap-3">
        <div className="flex gap-1 bg-surface border border-line rounded-lg p-1">
          {LINK_FILTERS.map(({ key, label }) => (
            <button
              key={key}
              onClick={() => setLink(key)}
              className={`text-sm px-3 py-1.5 rounded-md transition-colors ${
                link === key ? "bg-raised text-ink" : "text-ink-muted hover:text-ink-2"
              }`}
            >
              {label}
            </button>
          ))}
        </div>

        <div className="flex gap-1 bg-surface border border-line rounded-lg p-1">
          {TRANSCRIPT_FILTERS.map(({ key, label }) => (
            <button
              key={key}
              onClick={() => setTranscript(key)}
              className={`text-sm px-3 py-1.5 rounded-md transition-colors ${
                transcript === key ? "bg-raised text-ink" : "text-ink-muted hover:text-ink-2"
              }`}
            >
              {label}
            </button>
          ))}
        </div>

        <select
          value={systemId}
          onChange={(e) => setSystemId(e.target.value)}
          className="bg-surface border border-line rounded-lg text-sm text-ink px-3 py-2"
        >
          <option value="">All systems</option>
          {systems.map((s) => (
            <option key={s.system_id} value={s.system_id}>{s.name}</option>
          ))}
        </select>

        <form
          onSubmit={(e) => { e.preventDefault(); setSubmittedQ(q.trim()); }}
          className="flex items-center gap-2 ml-auto"
        >
          <input
            value={q}
            onChange={(e) => setQ(e.target.value)}
            placeholder="Search transcripts…"
            className="bg-surface border border-line rounded-lg text-sm text-ink px-3 py-2 w-56"
          />
          <Button size="sm" variant="secondary" type="submit">Search</Button>
        </form>
      </div>

      {calls.length > 0 && (
        <p className="text-ink-muted text-xs font-mono">
          {calls.length} calls · {orphanCount} orphaned · {noTranscript} without a transcript
        </p>
      )}

      {/* Gate A / A2 (server-26#46) — every row expands to a transcript. */}
      <MachineOutputNotice
        detail="transcripts and the incident links derived from them are automated output and may contain errors, including misheard names, addresses and unit numbers. Check the recording before acting on them."
      />

      {error && <ErrorBanner message={`Couldn't load calls: ${error}`} />}

      {loading && calls.length === 0 ? (
        <div className="space-y-2">
          <SkeletonCard /><SkeletonCard /><SkeletonCard />
        </div>
      ) : calls.length === 0 && !error ? (
        <EmptyState
          title="No calls match these filters"
          description="The search scans a bounded window of the most recent calls — widen the filters or clear the search text."
        />
      ) : (
        <div className="space-y-2">
          {calls.map((call) => (
            <ArchiveRow
              key={call.call_id}
              call={call}
              systemName={systemName(call.system_id)}
              incidents={incidents}
              canEdit={isAdmin}
              onChanged={() => load(null, false)}
            />
          ))}
        </div>
      )}

      {moreAvailable && (
        <div className="flex justify-center">
          <Button variant="secondary" onClick={() => load(cursor, true)} disabled={loading}>
            {loading ? "Loading…" : "Load more"}
          </Button>
        </div>
      )}
    </div>
  );
}