import { defineConfig } from "vitest/config";

/**
 * One worker per shard. A shard owns its whole topology — in-process freight
 * app, database, payment API, gateway mock, broker vhost — so files can run in
 * parallel without sharing anything mutable. See src/app.ts.
 */
const SHARDS = Number(process.env.IT_SHARDS ?? 1);

export default defineConfig({
  test: {
    include: ["src/**/*.it.ts"],
    globalSetup: ["src/global-setup.ts"],
    pool: "forks",
    // Pinned min = max: VITEST_POOL_ID is the shard key, and a worker that vitest
    // declines to spawn is a shard whose containers are idling.
    poolOptions: { forks: { minForks: SHARDS, maxForks: SHARDS } },
    fileParallelism: SHARDS > 1,
    // The freight app boots ONCE per worker and is memoised in module scope.
    // With isolation on, every file would pay a fresh Nest boot (60 modules,
    // TypeORM, 5 seeders) — 25 boots instead of `SHARDS`.
    isolate: false,
    testTimeout: 180_000,
    hookTimeout: 180_000,
    // Booking/scheduling steps are not idempotent — a retry would assert
    // against a half-advanced booking. (A whole-RUN retry is now safe, because
    // `it.mjs test` re-clones every shard database first.)
    retry: 0,
    // Workers hold a pg pool, three Socket.IO gateways, a RabbitMQ channel and
    // live cron timers; don't wait on those handles to unwind.
    teardownTimeout: 20_000,
    reporters: ["verbose"],
  },
});