import { NextResponse } from 'next/server';

import { getLogger } from '@kit/shared/logger';
import { getSupabaseServerAdminClient } from '@kit/supabase/server-admin-client';

export async function POST(request: Request) {
  const logger = await getLogger();

  try {
    const body = await request.json();
    const { courseId, firstName, lastName, email, phone } = body;

    if (!courseId || !firstName || !lastName || !email) {
      return NextResponse.json(
        { error: 'Kurs-ID, Vorname, Nachname und E-Mail sind erforderlich' },
        { status: 400 },
      );
    }

    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
      return NextResponse.json(
        { error: 'Ungültige E-Mail-Adresse' },
        { status: 400 },
      );
    }

    const supabase = getSupabaseServerAdminClient();

    const { error } = await supabase.from('course_participants').insert({
      course_id: courseId,
      first_name: firstName,
      last_name: lastName,
      email,
      phone: phone || null,
      status: 'enrolled',
      enrolled_at: new Date().toISOString(),
    });

    if (error) {
      logger.error(
        { error, context: 'course-register-insert' },
        '[course-register] Insert error',
      );
      return NextResponse.json(
        { error: 'Anmeldung fehlgeschlagen' },
        { status: 500 },
      );
    }

    return NextResponse.json({
      success: true,
      message: 'Anmeldung erfolgreich',
    });
  } catch (err) {
    logger.error(
      { error: err, context: 'course-register' },
      '[course-register] Error',
    );
    return NextResponse.json({ error: 'Serverfehler' }, { status: 500 });
  }
}