import http from 'k6/http';
import { check } from 'k6';
import { Counter } from 'k6/metrics';

const seed = JSON.parse(open('./seed-data.json'));
const BASE_URL = __ENV.BASE_URL || 'http://app:3000';

const successfulBookings = new Counter('successful_bookings');

export const options = {
  scenarios: {
    concurrent_booking: {
      executor: 'per-vu-iterations',
      vus: 10,
      iterations: 1,
      maxDuration: '30s',
    },
  },
  thresholds: {
    successful_bookings: ['count==1'],
  },
};

export default function () {
  const session = seed.sessions[0];
  const user = seed.users[__VU - 1];

  const response = http.post(
    `${BASE_URL}/sessions/${session.id}/book`,
    JSON.stringify({ userId: user.id }),
    {
      headers: { 'Content-Type': 'application/json' },
      responseCallback: http.expectedStatuses(200, 400),
    }
  );

  if (response.status === 200) {
    successfulBookings.add(1);
  }

  check(response, {
    'booking returned expected status': (r) =>
      r.status === 200 || r.status === 400,
  });

  console.log(
    `VU ${__VU}: status=${response.status}, session=${session.id}`
  );
}