import Link from 'next/link';

import { FileText, 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',
  sent: 'default',
  paid: 'info',
  overdue: 'destructive',
  cancelled: 'destructive',
};

const STATUS_LABEL: Record<string, string> = {
  draft: 'Entwurf',
  sent: 'Versendet',
  paid: 'Bezahlt',
  overdue: 'Überfällig',
  cancelled: 'Storniert',
};

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

export default async function InvoicesPage({ 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 invoices = await api.listInvoices(acct.id);

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

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

        {/* Table or Empty State */}
        {invoices.length === 0 ? (
          <EmptyState
            icon={<FileText className="h-8 w-8" />}
            title="Keine Rechnungen vorhanden"
            description="Erstellen Sie Ihre erste Rechnung."
            actionLabel="Neue Rechnung"
            actionHref={`/home/${account}/finance/invoices/new`}
          />
        ) : (
          <Card>
            <CardHeader>
              <CardTitle>Alle Rechnungen ({invoices.length})</CardTitle>
            </CardHeader>
            <CardContent>
              <div className="rounded-md border">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b bg-muted/50">
                      <th className="p-3 text-left font-medium">Nr.</th>
                      <th className="p-3 text-left font-medium">Empfänger</th>
                      <th className="p-3 text-left font-medium">Datum</th>
                      <th className="p-3 text-left font-medium">Fällig</th>
                      <th className="p-3 text-right font-medium">Betrag</th>
                      <th className="p-3 text-left font-medium">Status</th>
                    </tr>
                  </thead>
                  <tbody>
                    {invoices.map((invoice: Record<string, unknown>) => {
                      const status = String(invoice.status);
                      return (
                        <tr
                          key={String(invoice.id)}
                          className="border-b hover:bg-muted/30"
                        >
                          <td className="p-3 font-mono text-xs">
                            <Link
                              href={`/home/${account}/finance/invoices/${String(invoice.id)}`}
                              className="hover:underline"
                            >
                              {String(invoice.invoice_number ?? '—')}
                            </Link>
                          </td>
                          <td className="p-3">
                            {String(invoice.recipient_name ?? '—')}
                          </td>
                          <td className="p-3">
                            {invoice.issue_date
                              ? new Date(
                                  String(invoice.issue_date),
                                ).toLocaleDateString('de-DE')
                              : '—'}
                          </td>
                          <td className="p-3">
                            {invoice.due_date
                              ? new Date(
                                  String(invoice.due_date),
                                ).toLocaleDateString('de-DE')
                              : '—'}
                          </td>
                          <td className="p-3 text-right">
                            {invoice.total_amount != null
                              ? formatCurrency(invoice.total_amount)
                              : '—'}
                          </td>
                          <td className="p-3">
                            <Badge
                              variant={
                                STATUS_VARIANT[status] ?? 'secondary'
                              }
                            >
                              {STATUS_LABEL[status] ?? status}
                            </Badge>
                          </td>
                        </tr>
                      );
                    })}
                  </tbody>
                </table>
              </div>
            </CardContent>
          </Card>
        )}
      </div>
    </CmsPageShell>
  );
}