import http from 'k6/http';
import { check, sleep } from 'k6';

// k6 Load Test Configuration for NextGen Sync Engine & API
// SLA Target: 5,000 events/sec/shard
export const options = {
  stages: [
    { duration: '30s', target: 50 },  // Ramp up to 50 VUs
    { duration: '1m', target: 200 },  // Sustain 200 VUs for high throughput testing
    { duration: '30s', target: 0 },   // Ramp down
  ],
  thresholds: {
    http_req_duration: ['p(95)<200'], // 95% of requests must complete within 200ms
    http_req_failed: ['rate<0.01'],    // Error rate must be under 1%
  },
};

const BASE_URL = __ENV.TARGET_URL || 'http://localhost:3001';

export default function () {
  // Test 1: Health check / SLA probe
  const healthRes = http.get(`${BASE_URL}/api/health`);
  check(healthRes, {
    'health status is 200': (r) => r.status === 200,
  });

  // Test 2: Sync Engine metrics SLA probe
  const metricsRes = http.get(`${BASE_URL}/api/metrics`);
  check(metricsRes, {
    'metrics status is 200': (r) => r.status === 200,
  });

  sleep(0.1);
}