/**
 * Admin: Kalenderverwaltung (Cards-Ansicht).
 * Zeigt alle Kalender als Karten - eigene und die anderer Benutzer.
 * Verwaltung direkt im Bearbeiten-Modal oder auf der Detailseite
 * /admin/calendars/[id] (Invites, Mitglieder, Reservierungen).
 */
import { redirect } from 'next/navigation';
import { prisma } from '@/lib/db/client';
import { requireDbUser } from '@/lib/api/context';
import { AppShell } from '@/components/layout/AppShell';
import { CalendarManager } from '@/components/admin/CalendarManager';

export default async function ManageCalendarsPage() {
  const user = await requireDbUser().catch(() => null);
  if (!user || user.role !== 'ADMIN') {
    redirect('/dashboard');
  }

  const calendars = await prisma.calendar.findMany({
    orderBy: { createdAt: 'desc' },
    select: {
      id: true,
      title: true,
      description: true,
      timezone: true,
      isActive: true,
      maxReservationMinutes: true,
      showTitleToMembers: true,
      showNotesToMembers: true,
      ownerId: true,
      owner: { select: { email: true, username: true } },
      _count: { select: { members: true, reservations: true } },
    },
  });

  return (
    <AppShell role={user.role} userEmail={user.email} username={user.username}>
      <CalendarManager
        currentUserId={user.id}
        isAdmin={user.role === 'ADMIN'}
        initialCalendars={calendars.map((calendar) => ({
          id: calendar.id,
          title: calendar.title,
          description: calendar.description,
          timezone: calendar.timezone,
          isActive: calendar.isActive,
          ownerEmail: calendar.owner.username ?? calendar.owner.email,
          isOwn: calendar.ownerId === user.id,
          memberCount: calendar._count.members,
          reservationCount: calendar._count.reservations,
          maxReservationMinutes: calendar.maxReservationMinutes,
          showTitleToMembers: calendar.showTitleToMembers,
          showNotesToMembers: calendar.showNotesToMembers,
        }))}
      />
    </AppShell>
  );
}