'use client';

/** Formular zum Erstellen eines Kalenders (nur Admin). */
import { useState } from 'react';
import { useRouter } from 'next/navigation';
import { Button, Card, ErrorMessage, Input, Label } from '@/components/ui/ui';

export function CreateCalendarForm() {
  const router = useRouter();
  const [error, setError] = useState<string | null>(null);
  const [busy, setBusy] = useState(false);

  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();
    setBusy(true);
    setError(null);

    const formData = new FormData(event.currentTarget);
    try {
      const response = await fetch('/api/calendars', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          title: formData.get('title'),
          description: formData.get('description') || undefined,
          timezone: formData.get('timezone'),
        }),
      });

      if (!response.ok) {
        const data = (await response.json()) as { error?: string };
        setError(data.error ?? 'Erstellen fehlgeschlagen.');
        return;
      }
      router.push('/dashboard');
      router.refresh();
    } catch {
      setError('Netzwerkfehler. Bitte erneut versuchen.');
    } finally {
      setBusy(false);
    }
  }

  return (
    <Card>
      <form onSubmit={handleSubmit} className="space-y-4">
        <ErrorMessage message={error} />
        <div>
          <Label htmlFor="title">Titel</Label>
          <Input id="title" name="title" type="text" required maxLength={120} />
        </div>
        <div>
          <Label htmlFor="description">Beschreibung (optional)</Label>
          <Input id="description" name="description" type="text" maxLength={2000} />
        </div>
        <div>
          <Label htmlFor="timezone">Zeitzone</Label>
          <Input
            id="timezone"
            name="timezone"
            type="text"
            required
            defaultValue="Europe/Berlin"
            maxLength={64}
          />
        </div>
        <Button disabled={busy}>{busy ? 'Erstellen …' : 'Kalender erstellen'}</Button>
      </form>
    </Card>
  );
}