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 { createNewsletterApi } from '@kit/newsletter/api';

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

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

export default async function NewsletterTemplatesPage({ 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 = createNewsletterApi(client);
  const templates = await api.listTemplates(acct.id);

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

          <Button>
            <Plus className="mr-2 h-4 w-4" />
            Neue Vorlage
          </Button>
        </div>

        {/* Table or Empty State */}
        {templates.length === 0 ? (
          <EmptyState
            icon={<FileText className="h-8 w-8" />}
            title="Keine Vorlagen vorhanden"
            description="Erstellen Sie Ihre erste Newsletter-Vorlage, um sie in Kampagnen wiederzuverwenden."
            actionLabel="Neue Vorlage"
          />
        ) : (
          <Card>
            <CardHeader>
              <CardTitle>Alle Vorlagen ({templates.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">Name</th>
                      <th className="p-3 text-left font-medium">Betreff</th>
                      <th className="p-3 text-left font-medium">Variablen</th>
                    </tr>
                  </thead>
                  <tbody>
                    {templates.map((template: Record<string, unknown>) => {
                      const variables = Array.isArray(template.variables)
                        ? (template.variables as string[])
                        : [];
                      return (
                        <tr
                          key={String(template.id)}
                          className="border-b hover:bg-muted/30"
                        >
                          <td className="p-3 font-medium">
                            {String(template.name ?? '—')}
                          </td>
                          <td className="p-3">
                            {String(template.subject ?? '—')}
                          </td>
                          <td className="p-3">
                            <div className="flex flex-wrap gap-1">
                              {variables.length > 0
                                ? variables.map((v) => (
                                    <Badge
                                      key={v}
                                      variant="secondary"
                                      className="text-xs"
                                    >
                                      {`{{${v}}}`}
                                    </Badge>
                                  ))
                                : <span className="text-muted-foreground">—</span>}
                            </div>
                          </td>
                        </tr>
                      );
                    })}
                  </tbody>
                </table>
              </div>
            </CardContent>
          </Card>
        )}
      </div>
    </CmsPageShell>
  );
}