import * as z from 'zod';

import {
  apiError,
  apiSuccess,
  emailSchema,
  requiredString,
} from '@kit/next/route-helpers';
import { getLogger } from '@kit/shared/logger';
import { getSupabaseServerAdminClient } from '@kit/supabase/server-admin-client';

const CourseRegisterSchema = z.object({
  courseId: requiredString('Kurs-ID'),
  firstName: requiredString('Vorname'),
  lastName: requiredString('Nachname'),
  email: emailSchema,
  phone: z.string().optional(),
});

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

  try {
    const body = await request.json();
    const parsed = CourseRegisterSchema.safeParse(body);

    if (!parsed.success) {
      return apiError(parsed.error.issues[0]?.message ?? 'Ungültige Eingabe');
    }

    const { courseId, firstName, lastName, email, phone } = parsed.data;

    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 apiError('Anmeldung fehlgeschlagen', 500);
    }

    return apiSuccess({ message: 'Anmeldung erfolgreich' });
  } catch (err) {
    logger.error(
      { error: err, context: 'course-register' },
      '[course-register] Error',
    );
    return apiError('Serverfehler', 500);
  }
}