// app/api/user-groups/route.ts
import { NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';

export async function POST(req: Request) {
  try {
    const { name } = await req.json();

    if (!name || typeof name !== 'string') {
      return NextResponse.json(
        { error: 'Gruppenname ist erforderlich.' },
        { status: 400 },
      );
    }

    const trimmed = name.trim();
    if (!trimmed) {
      return NextResponse.json(
        { error: 'Gruppenname darf nicht leer sein.' },
        { status: 400 },
      );
    }

    const group = await prisma.userGroup.upsert({
      where: { name: trimmed },
      update: {},
      create: { name: trimmed },
    });

    return NextResponse.json(
      { id: group.id, name: group.name },
      { status: 200 },
    );
  } catch (err) {
    console.error('[POST /api/user-groups]', err);
    return NextResponse.json(
      { error: 'Interner Serverfehler beim Anlegen der User-Gruppe.' },
      { status: 500 },
    );
  }
}