import type { Metadata } from "next";
import { requireAdmin } from "@/lib/auth";
import { getSettings } from "@/lib/settings";
import { prisma } from "@/lib/db";
import { env } from "@/lib/env";
import { AppShell } from "@/components/AppShell";
import { AdminSettings, UserRow } from "@/components/settings/Forms";
import { formatRelative } from "@/lib/labels";

export const metadata: Metadata = { title: "Verwaltung" };

export default async function AdminPage() {
  const admin = await requireAdmin();
  const settings = await getSettings();

  const [users, lastRun, catalog] = await Promise.all([
    prisma.user.findMany({
      orderBy: { createdAt: "asc" },
      select: {
        id: true,
        name: true,
        email: true,
        role: true,
        isActive: true,
        _count: { select: { entries: true } },
      },
    }),
    prisma.syncRun.findFirst({ orderBy: { startedAt: "desc" } }),
    Promise.all([
      prisma.title.count(),
      prisma.episode.count(),
      prisma.watch.count(),
    ]),
  ]);

  const [titleCount, episodeCount, watchCount] = catalog;

  return (
    <AppShell user={admin} instanceName={settings.instanceName}>
      <header className="mb-6">
        <h1 className="text-2xl font-semibold tracking-tight sm:text-3xl">Verwaltung</h1>
        <p className="mt-1 text-sm text-[var(--fl-muted)]">
          Einstellungen der Instanz, Konten und Hintergrundlauf.
        </p>
      </header>

      <div className="grid gap-6 lg:grid-cols-2">
        <section className="fl-card p-5">
          <h2 className="mb-4 text-lg font-semibold">Instanz</h2>
          <AdminSettings
            registrationEnabled={settings.registrationEnabled}
            publicProfilesEnabled={settings.publicProfilesEnabled}
            instanceName={settings.instanceName}
          />
        </section>

        <div className="space-y-6">
          <section className="fl-card p-5">
            <h2 className="mb-4 text-lg font-semibold">Zustand</h2>
            <dl className="grid grid-cols-2 gap-4 text-sm">
              <Fact label="Konten" value={String(users.length)} />
              <Fact label="Titel im Katalog" value={titleCount.toLocaleString("de-DE")} />
              <Fact label="Episoden" value={episodeCount.toLocaleString("de-DE")} />
              <Fact label="Sichtungen" value={watchCount.toLocaleString("de-DE")} />
              <Fact
                label="TMDB"
                value={env.tmdb.isConfigured ? "eingerichtet" : "kein Schlüssel"}
              />
              <Fact label="SMTP" value={env.smtp.isConfigured ? "eingerichtet" : "nicht gesetzt"} />
              <Fact
                label="Zeitplan"
                value={
                  env.scheduler.enabled
                    ? `täglich ${String(env.scheduler.hour).padStart(2, "0")}:05 Uhr`
                    : "abgeschaltet"
                }
              />
              <Fact label="OIDC" value={env.oidc.isConfigured ? "eingerichtet" : "nicht gesetzt"} />
            </dl>
          </section>

          <section className="fl-card p-5">
            <h2 className="mb-3 text-lg font-semibold">Letzter Abgleich</h2>
            {lastRun ? (
              <p className="text-sm text-[var(--fl-muted)]">
                {formatRelative(lastRun.startedAt)} ·{" "}
                <span style={{ color: lastRun.ok ? "var(--fl-success)" : "var(--fl-danger)" }}>
                  {lastRun.ok ? "erfolgreich" : "mit Fehlern"}
                </span>
                {lastRun.message ? ` · ${lastRun.message}` : ""}
              </p>
            ) : (
              <p className="text-sm text-[var(--fl-faint)]">Noch kein Abgleich gelaufen.</p>
            )}
          </section>
        </div>
      </div>

      <section className="fl-card mt-6 p-5">
        <h2 className="mb-2 text-lg font-semibold">Konten</h2>
        <ul className="divide-y divide-[var(--fl-border)]">
          {users.map((user) => (
            <UserRow
              key={user.id}
              user={{
                id: user.id,
                name: user.name,
                email: user.email,
                role: user.role,
                isActive: user.isActive,
                entries: user._count.entries,
              }}
              isSelf={user.id === admin.id}
            />
          ))}
        </ul>
      </section>
    </AppShell>
  );
}

function Fact({ label, value }: { label: string; value: string }) {
  return (
    <div>
      <dt className="text-xs uppercase tracking-wide text-[var(--fl-faint)]">{label}</dt>
      <dd className="mt-0.5 font-medium">{value}</dd>
    </div>
  );
}