/**
 * Load test: health, readyz, status
 * Usage: k6 run loadtests/backend/health.js
 */
import http from 'k6/http';
import { check, sleep } from 'k6';
import { Rate, Trend } from 'k6/metrics';

const errorRate = new Rate('errors');
const healthCheckDuration = new Trend('health_check_duration');
const readyzCheckDuration = new Trend('readyz_check_duration');

const BASE_URL = __ENV.BASE_URL || __ENV.API_ORIGIN || 'http://localhost:8080';

export const options = {
  stages: [
    { duration: '30s', target: 10 },
    { duration: '1m', target: 10 },
    { duration: '30s', target: 0 },
  ],
  thresholds: {
    http_req_duration: ['p(95)<500', 'p(99)<1000'],
    errors: ['rate<0.05'],
    health_check_duration: ['p(95)<100'],
    readyz_check_duration: ['p(95)<200'],
  },
};

export default function () {
  const healthRes = http.get(`${BASE_URL}/health`);
  const healthCheck = check(healthRes, {
    'health status is 200': (r) => r.status === 200,
    'health response has status': (r) => {
      try {
        const body = JSON.parse(r.body);
        return body.success === true && body.data && body.data.status;
      } catch (e) {
        return false;
      }
    },
  });
  errorRate.add(!healthCheck);
  healthCheckDuration.add(healthRes.timings.duration);
  sleep(0.5);

  const readyzRes = http.get(`${BASE_URL}/readyz`);
  const readyzCheck = check(readyzRes, {
    'readyz status is 200': (r) => r.status === 200,
    'readyz response has status': (r) => {
      try {
        const body = JSON.parse(r.body);
        return body.success === true && body.data && body.data.status;
      } catch (e) {
        return false;
      }
    },
  });
  errorRate.add(!readyzCheck);
  readyzCheckDuration.add(readyzRes.timings.duration);
  sleep(0.5);

  const statusRes = http.get(`${BASE_URL}/api/v1/status`);
  check(statusRes, { 'status returns 200 or 503': (r) => r.status === 200 || r.status === 503 });
  sleep(1);
}