// k6 load-test: tenant-scoped mutating path (`POST /v1/entities/:slug/rows`).
//
// Profile: 30 VUs for 30s. Mutating writes are bounded by database write
// contention, idempotency-key bookkeeping, and audit logging — so the
// concurrency is intentionally lower than the read path. The p(99) latency
// budget covers transactional write + audit + queue enqueue.
//
// Run:
//   K6_TARGET_URL=http://localhost:3000 \
//   LOAD_TENANT_API_KEY=tnk_live_xxx \
//   k6 run tests/load/api-mutating.js
//
// Required env:
//   LOAD_TENANT_API_KEY  tenant-scoped API key for the test tenant
// Optional env:
//   LOAD_ENTITY_SLUG     entity slug to write to (default: load-test-entity)

import http from "k6/http";
import { check, group } from "k6";

export const options = {
  scenarios: {
    api_mutating: {
      executor: "constant-vus",
      vus: 30,
      duration: "30s",
      tags: { suite: "api-mutating" },
    },
  },
  thresholds: {
    http_req_failed: ["rate<0.02"],
    http_req_duration: ["p(99)<600"],
  },
  discardResponseBodies: true,
};

const TARGET_URL = __ENV.K6_TARGET_URL || "http://localhost:3000";
const TENANT_API_KEY = __ENV.LOAD_TENANT_API_KEY || "tnk_load_test_key";
const ENTITY_SLUG = __ENV.LOAD_ENTITY_SLUG || "load-test-entity";

export default function apiMutatingScenario() {
  group("api-mutating", function () {
    const payload = JSON.stringify({
      data: {
        // Deterministic, non-PII synthetic payload — load tests must not seed
        // customer-shaped data into the target environment.
        label: `load-test-row-${__VU}-${__ITER}`,
        value: __ITER,
      },
    });
    const params = {
      headers: {
        accept: "application/json",
        "content-type": "application/json",
        authorization: `Bearer ${TENANT_API_KEY}`,
        // Idempotency key keeps re-runs from accumulating duplicate rows when
        // the target environment supports the standard idempotency contract.
        "idempotency-key": `load-${__VU}-${__ITER}`,
      },
      tags: { name: "api-mutating" },
    };
    const res = http.post(`${TARGET_URL}/v1/entities/${ENTITY_SLUG}/rows`, payload, params);
    check(res, {
      "status is 2xx, 401, 404, or 409": (r) =>
        (r.status >= 200 && r.status < 300) || r.status === 401 || r.status === 404 || r.status === 409,
    });
  });
}