import Link from 'next/link';

import { Landmark, Plus } 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 { createFinanceApi } from '@kit/finance/api';

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

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

const STATUS_VARIANT: Record<
  string,
  'secondary' | 'default' | 'info' | 'outline' | 'destructive'
> = {
  draft: 'secondary',
  ready: 'default',
  submitted: 'info',
  completed: 'outline',
  failed: 'destructive',
};

const STATUS_LABEL: Record<string, string> = {
  draft: 'Entwurf',
  ready: 'Bereit',
  submitted: 'Eingereicht',
  completed: 'Abgeschlossen',
  failed: 'Fehlgeschlagen',
};

const formatCurrency = (amount: unknown) =>
  new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(
    Number(amount),
  );

export default async function SepaPage({ 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 = createFinanceApi(client);
  const batches = await api.listBatches(acct.id);

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

          <Link href={`/home/${account}/finance/sepa/new`}>
            <Button>
              <Plus className="mr-2 h-4 w-4" />
              Neuer Einzug
            </Button>
          </Link>
        </div>

        {/* Table or Empty State */}
        {batches.length === 0 ? (
          <EmptyState
            icon={<Landmark className="h-8 w-8" />}
            title="Keine SEPA-Einzüge"
            description="Erstellen Sie Ihren ersten SEPA-Einzug."
            actionLabel="Neuer Einzug"
            actionHref={`/home/${account}/finance/sepa/new`}
          />
        ) : (
          <Card>
            <CardHeader>
              <CardTitle>Alle Einzüge ({batches.length})</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">Status</th>
                      <th className="p-3 text-left font-medium">Typ</th>
                      <th className="p-3 text-left font-medium">
                        Beschreibung
                      </th>
                      <th className="p-3 text-right font-medium">Betrag</th>
                      <th className="p-3 text-right font-medium">Anzahl</th>
                      <th className="p-3 text-left font-medium">
                        Ausführungsdatum
                      </th>
                    </tr>
                  </thead>
                  <tbody>
                    {batches.map((batch: Record<string, unknown>) => (
                      <tr
                        key={String(batch.id)}
                        className="border-b hover:bg-muted/30"
                      >
                        <td className="p-3">
                          <Badge
                            variant={
                              STATUS_VARIANT[String(batch.status)] ?? 'secondary'
                            }
                          >
                            {STATUS_LABEL[String(batch.status)] ??
                              String(batch.status)}
                          </Badge>
                        </td>
                        <td className="p-3">
                          {batch.batch_type === 'direct_debit'
                            ? 'Lastschrift'
                            : 'Überweisung'}
                        </td>
                        <td className="p-3">
                          <Link
                            href={`/home/${account}/finance/sepa/${String(batch.id)}`}
                            className="hover:underline"
                          >
                            {String(batch.description ?? '—')}
                          </Link>
                        </td>
                        <td className="p-3 text-right">
                          {batch.total_amount != null
                            ? formatCurrency(batch.total_amount)
                            : '—'}
                        </td>
                        <td className="p-3 text-right">
                          {String(batch.item_count ?? 0)}
                        </td>
                        <td className="p-3">
                          {batch.execution_date
                            ? new Date(
                                String(batch.execution_date),
                              ).toLocaleDateString('de-DE')
                            : '—'}
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </CardContent>
          </Card>
        )}
      </div>
    </CmsPageShell>
  );
}