import { defineConfig } from 'vitest/config'

/**
 * Perf/scale + environment-dependent test configuration.
 *
 * The exclusive on-demand slot for everything the correctness gate
 * (`vitest.config.ts`, the config a bare `vitest run` picks up) excludes:
 * wall-clock/scale benchmarks and the two tests whose outcome depends on
 * the host machine or network rather than the code. See CONTRIBUTING.md's
 * "Test gate" section and the exclude list in `vitest.config.ts` (root) for
 * why each file lives here instead of the gate.
 *
 * `include` names this set explicitly — it is the mirror image of the
 * root config's exclude list, not an independent glob, so the two stay in
 * sync by inspection. Longer timeouts than the gate's 120s/60s: one case in
 * tests/critical-performance-benchmark.test.ts measures ~128s of real work.
 */
export default defineConfig({
  test: {
    globals: true,
    setupFiles: ['./tests/setup.ts'],
    environment: 'node',

    // The marker a test uses to tell it is running under this lane (see
    // tests/integration/storage-batch-operations.test.ts's batch-vs-
    // individual timing case) — a wall-clock RATIO assertion self-skips
    // with a reason when this is absent, rather than flaking the
    // correctness gate on whichever path happens to be faster this build.
    env: { BRAINY_PERF_LANE: '1' },

    // Sequential, single fork — same isolation the gate uses, so a perf
    // measurement isn't skewed by sibling test contention.
    pool: 'forks',
    poolOptions: {
      forks: {
        maxForks: 1,
        minForks: 1,
        singleFork: true,
        isolate: true
      }
    },

    testTimeout: 300000, // 5 minutes per test (the 128s case plus headroom)
    hookTimeout: 120000,
    teardownTimeout: 10000,

    maxConcurrency: 1,
    fileParallelism: false,

    include: [
      'tests/performance/**/*.{test,spec}.{js,ts}',
      'tests/critical-performance-benchmark.test.ts',
      'tests/api/performance-benchmarks.test.ts',
      'tests/package-size-limit.test.ts',
      'tests/model-loading.test.ts',
      // Not a whole perf file — one wall-clock-ratio case inside an
      // otherwise-correctness integration suite (self-skipped everywhere
      // else via BRAINY_PERF_LANE). Stays in the integration gate's
      // include too, so every OTHER test in the file keeps running there.
      'tests/integration/storage-batch-operations.test.ts',
      // Same pattern: one wall-clock budget case (100-file write + readdir,
      // 5.5s budget) inside an otherwise-correctness VFS unit suite
      // (self-skipped everywhere else via BRAINY_PERF_LANE — see
      // tests/vfs/vfs.unit.test.ts's 'Performance > should handle many
      // files efficiently'). Stays in the unit gate's *.unit.test.ts match
      // too, so every OTHER test in the file keeps running there.
      'tests/vfs/vfs.unit.test.ts'
    ],

    reporters: process.env.CI ? ['dot'] : ['basic'],

    retry: process.env.CI ? 1 : 0,
    shard: process.env.VITEST_SHARD
  }
})