import Link from 'next/link';

import { CalendarDays, MapPin, Plus, Users } from 'lucide-react';

import { getSupabaseServerClient } from '@kit/supabase/server-client';
import { Badge } from '@kit/ui/badge';
import { Button } from '@kit/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@kit/ui/card';

import { createEventManagementApi } from '@kit/event-management/api';

import { CmsPageShell } from '~/components/cms-page-shell';
import { EmptyState } from '~/components/empty-state';
import { StatsCard } from '~/components/stats-card';

interface PageProps {
  params: Promise<{ account: string }>;
}

const STATUS_BADGE_VARIANT: Record<
  string,
  'secondary' | 'default' | 'info' | 'outline' | 'destructive'
> = {
  draft: 'secondary',
  published: 'default',
  registration_open: 'info',
  registration_closed: 'outline',
  cancelled: 'destructive',
  completed: 'outline',
};

const STATUS_LABEL: Record<string, string> = {
  draft: 'Entwurf',
  published: 'Veröffentlicht',
  registration_open: 'Anmeldung offen',
  registration_closed: 'Anmeldung geschlossen',
  cancelled: 'Abgesagt',
  completed: 'Abgeschlossen',
};

export default async function EventsPage({ params }: PageProps) {
  const { account } = await params;
  const client = getSupabaseServerClient();

  const { data: acct } = await client
    .from('accounts')
    .select('id')
    .eq('slug', account)
    .single();

  if (!acct) return <div>Konto nicht gefunden</div>;

  const api = createEventManagementApi(client);
  const events = await api.listEvents(acct.id, { page: 1 });

  return (
    <CmsPageShell account={account} title="Veranstaltungen">
      <div className="flex w-full flex-col gap-6">
        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold">Veranstaltungen</h1>
            <p className="text-muted-foreground">
              Veranstaltungen und Ferienprogramme
            </p>
          </div>

          <Link href={`/home/${account}/events/new`}>
            <Button>
              <Plus className="mr-2 h-4 w-4" />
              Neue Veranstaltung
            </Button>
          </Link>
        </div>

        {/* Stats */}
        <div className="grid grid-cols-1 gap-4 sm:grid-cols-3">
          <StatsCard
            title="Veranstaltungen"
            value={events.total}
            icon={<CalendarDays className="h-5 w-5" />}
          />
          <StatsCard
            title="Orte"
            value={
              new Set(
                events.data
                  .map((e: Record<string, unknown>) => e.location)
                  .filter(Boolean),
              ).size
            }
            icon={<MapPin className="h-5 w-5" />}
          />
          <StatsCard
            title="Kapazität gesamt"
            value={events.data.reduce(
              (sum: number, e: Record<string, unknown>) =>
                sum + (Number(e.capacity) || 0),
              0,
            )}
            icon={<Users className="h-5 w-5" />}
          />
        </div>

        {/* Table or Empty State */}
        {events.data.length === 0 ? (
          <EmptyState
            icon={<CalendarDays className="h-8 w-8" />}
            title="Keine Veranstaltungen vorhanden"
            description="Erstellen Sie Ihre erste Veranstaltung, um loszulegen."
            actionLabel="Neue Veranstaltung"
            actionHref={`/home/${account}/events/new`}
          />
        ) : (
          <Card>
            <CardHeader>
              <CardTitle>Alle Veranstaltungen ({events.total})</CardTitle>
            </CardHeader>
            <CardContent>
              <div className="rounded-md border">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b bg-muted/50">
                      <th className="p-3 text-left font-medium">Name</th>
                      <th className="p-3 text-left font-medium">Datum</th>
                      <th className="p-3 text-left font-medium">Ort</th>
                      <th className="p-3 text-right font-medium">Kapazität</th>
                      <th className="p-3 text-left font-medium">Status</th>
                      <th className="p-3 text-right font-medium">Anmeldungen</th>
                    </tr>
                  </thead>
                  <tbody>
                    {events.data.map((event: Record<string, unknown>) => (
                      <tr
                        key={String(event.id)}
                        className="border-b hover:bg-muted/30"
                      >
                        <td className="p-3 font-medium">
                          <Link
                            href={`/home/${account}/events/${String(event.id)}`}
                            className="hover:underline"
                          >
                            {String(event.name)}
                          </Link>
                        </td>
                        <td className="p-3">
                          {event.event_date
                            ? new Date(String(event.event_date)).toLocaleDateString('de-DE')
                            : '—'}
                        </td>
                        <td className="p-3">
                          {String(event.location ?? '—')}
                        </td>
                        <td className="p-3 text-right">
                          {event.capacity != null
                            ? String(event.capacity)
                            : '—'}
                        </td>
                        <td className="p-3">
                          <Badge
                            variant={
                              STATUS_BADGE_VARIANT[String(event.status)] ?? 'secondary'
                            }
                          >
                            {STATUS_LABEL[String(event.status)] ?? String(event.status)}
                          </Badge>
                        </td>
                        <td className="p-3 text-right">—</td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </CardContent>
          </Card>
        )}
      </div>
    </CmsPageShell>
  );
}