import { defineConfig } from 'vitest/config';

export default defineConfig({
  test: {
    // Node environment for all tests (server-side CJS modules, no browser APIs needed)
    environment: 'node',
    // Global test helpers (describe, it, expect, vi) without per-file imports
    globals: true,
    // Run each test file in an isolated module registry so module-level state
    // (tokenStore cache, config singletons) doesn't leak between files
    isolate: true,
    // Give each file its own data directory so tokenStore file I/O doesn't collide
    setupFiles: ['./tests/setup.js'],
    // Coverage via V8 (built into Node — no babel transform needed)
    coverage: {
      provider: 'v8',
      reporter: ['text', 'lcov', 'html'],
      reportsDirectory: './coverage',
      // Only measure coverage on production source files
      include: ['server/**/*.js'],
      exclude: [
        'server/index.js',   // entry point with side-effects (process.exit, log streams)
        'node_modules/**',
        'tests/**',
        'coverage/**'
      ],
      // Global thresholds only — per-file thresholds are avoided because V8's
      // coverage counting varies across Node versions (CI consistently reports
      // ~10-15% lower than local for module-wrapper and require() lines).
      // The overall numbers reflect that dashboard.js and poller.js are large
      // untested files; the security-critical files (auth, middleware, utils)
      // are well-covered by the 115 tests.
      thresholds: {
        lines: 25,
        functions: 12,
        branches: 12,
        statements: 25
      }
    }
  }
});