import Link from 'next/link';

import {
  CalendarDays,
  MapPin,
  Users,
  Clock,
  Pencil,
  UserPlus,
} from 'lucide-react';

import { createEventManagementApi } from '@kit/event-management/api';
import { formatDate } from '@kit/shared/dates';
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 { CmsPageShell } from '~/components/cms-page-shell';

import { DeleteEventButton } from './delete-event-button';

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

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

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

export default async function EventDetailPage({ params }: PageProps) {
  const { account, eventId } = await params;
  const client = getSupabaseServerClient();
  const api = createEventManagementApi(client);

  const [event, registrations] = await Promise.all([
    api.getEvent(eventId),
    api.getRegistrations(eventId),
  ]);

  if (!event) return <div>Veranstaltung nicht gefunden</div>;

  const eventData = event as Record<string, unknown>;

  return (
    <CmsPageShell account={account} title={String(eventData.name)}>
      <div className="flex w-full flex-col gap-6">
        {/* Action Buttons */}
        <div className="flex justify-end gap-2">
          <Button asChild variant="outline" size="sm">
            <Link href={`/home/${account}/events/${eventId}/edit`}>
              <Pencil className="mr-2 h-4 w-4" />
              Bearbeiten
            </Link>
          </Button>
          <DeleteEventButton eventId={eventId} accountSlug={account} />
        </div>

        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold">{String(eventData.name)}</h1>
            <Badge
              variant={STATUS_VARIANT[String(eventData.status)] ?? 'secondary'}
              className="mt-1"
            >
              {STATUS_LABEL[String(eventData.status)] ??
                String(eventData.status)}
            </Badge>
          </div>
          <Button>
            <UserPlus className="mr-2 h-4 w-4" />
            Anmelden
          </Button>
        </div>

        {/* Detail Cards */}
        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-4">
          <Card>
            <CardContent className="flex items-center gap-3 p-4">
              <CalendarDays className="text-primary h-5 w-5" />
              <div>
                <p className="text-muted-foreground text-xs">Datum</p>
                <p className="font-semibold">
                  {formatDate(eventData.event_date as string)}
                </p>
              </div>
            </CardContent>
          </Card>
          <Card>
            <CardContent className="flex items-center gap-3 p-4">
              <Clock className="text-primary h-5 w-5" />
              <div>
                <p className="text-muted-foreground text-xs">Uhrzeit</p>
                <p className="font-semibold">
                  {String(eventData.start_time ?? '—')} –{' '}
                  {String(eventData.end_time ?? '—')}
                </p>
              </div>
            </CardContent>
          </Card>
          <Card>
            <CardContent className="flex items-center gap-3 p-4">
              <MapPin className="text-primary h-5 w-5" />
              <div>
                <p className="text-muted-foreground text-xs">Ort</p>
                <p className="font-semibold">
                  {String(eventData.location ?? '—')}
                </p>
              </div>
            </CardContent>
          </Card>
          <Card>
            <CardContent className="flex items-center gap-3 p-4">
              <Users className="text-primary h-5 w-5" />
              <div>
                <p className="text-muted-foreground text-xs">Anmeldungen</p>
                <p className="font-semibold">
                  {registrations.length} / {String(eventData.capacity ?? '∞')}
                </p>
              </div>
            </CardContent>
          </Card>
        </div>

        {/* Description */}
        {eventData.description ? (
          <Card>
            <CardHeader>
              <CardTitle>Beschreibung</CardTitle>
            </CardHeader>
            <CardContent>
              <p className="text-muted-foreground text-sm whitespace-pre-wrap">
                {String(eventData.description)}
              </p>
            </CardContent>
          </Card>
        ) : null}

        {/* Registrations Table */}
        <Card>
          <CardHeader>
            <CardTitle>Anmeldungen ({registrations.length})</CardTitle>
          </CardHeader>
          <CardContent>
            {registrations.length === 0 ? (
              <p className="text-muted-foreground py-6 text-center text-sm">
                Noch keine Anmeldungen
              </p>
            ) : (
              <div className="rounded-md border">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="bg-muted/50 border-b">
                      <th className="p-3 text-left font-medium">Name</th>
                      <th className="p-3 text-left font-medium">E-Mail</th>
                      <th className="p-3 text-left font-medium">Elternteil</th>
                      <th className="p-3 text-left font-medium">Datum</th>
                    </tr>
                  </thead>
                  <tbody>
                    {registrations.map((reg: Record<string, unknown>) => (
                      <tr
                        key={String(reg.id)}
                        className="hover:bg-muted/30 border-b"
                      >
                        <td className="p-3 font-medium">
                          {String(reg.last_name ?? '')},{' '}
                          {String(reg.first_name ?? '')}
                        </td>
                        <td className="p-3">{String(reg.email ?? '—')}</td>
                        <td className="p-3">
                          {String(reg.parent_name ?? '—')}
                        </td>
                        <td className="p-3">
                          {formatDate(reg.created_at as string)}
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            )}
          </CardContent>
        </Card>
      </div>
    </CmsPageShell>
  );
}
