import { configDefaults, defineConfig } from 'vitest/config'
import react from '@vitejs/plugin-react'
import { resolve } from 'path'

export default defineConfig({
  plugins: [react()],
  resolve: {
    alias: {
      '@': resolve(__dirname, 'src'),
    },
  },
  test: {
    globals: true,
    environment: 'jsdom',
    setupFiles: ['./tests/setup.ts'],
    // The Playwright E2E suite lives under e2e/ and uses @playwright/test's
    // own test runner (`npm run e2e`), not Vitest's — exclude it here so
    // `vitest run` never tries to collect those specs.
    exclude: [...configDefaults.exclude, 'e2e/**'],
    coverage: {
      provider: 'v8',
      reporter: ['text', 'lcov'],
      // Thresholds set as a regression ratchet to prevent coverage from dropping.
      // Measured: lines 97.27%, functions 92.87%, statements 97.27%, branches 93.78%.
      // Set ~1-2pp below measured to catch real regressions without false positives.
      thresholds: {
        lines: 96,
        functions: 91,
        branches: 92,
        statements: 96,
      },
      include: ['src/**/*.{ts,tsx}'],
      exclude: [
        'src/main.tsx',
        'src/vite-env.d.ts',
        'src/types/**',
        '**/*.test.ts',
        '**/*.test.tsx',
      ],
    },
  },
})