module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'jsdom',
  roots: ['<rootDir>/src'],
  testMatch: ['**/__tests__/**/*.test.{ts,tsx}', '**/*.test.{ts,tsx}'],
  // 仅收集实际可单元测试的目录的覆盖率，排除 pages/API routes/admin 等需集成/E2E 测试的代码
  collectCoverageFrom: [
    'src/components/ui/**/*.{ts,tsx}',
    'src/components/layout/**/*.{ts,tsx}',
    'src/components/seo/**/*.{ts,tsx}',
    'src/components/detail/**/*.{ts,tsx}',
    'src/components/sections/**/*.{ts,tsx}',
    'src/components/content/**/*.{ts,tsx}',
    'src/hooks/**/*.{ts,tsx}',
    'src/lib/**/*.ts',
    '!src/**/*.d.ts',
    '!src/**/*.stories.{ts,tsx}',
    '!src/**/__tests__/**',
  ],
  // 覆盖率阈值采用渐进提升策略：初始值设低于当前实测值，每完成一个迭代任务后提升
  // 当前实测值: global(~17% stmts/~12% branches), hooks(~18%/~5%), lib(~33%/~10%), ui(~16%/~21%)
  coverageThreshold: {
    global: {
      branches: 10,
      functions: 10,
      lines: 15,
      statements: 14,
    },
    './src/hooks/': {
      branches: 3,
      functions: 15,
      lines: 15,
      statements: 14,
    },
    './src/lib/': {
      branches: 8,
      functions: 18,
      lines: 28,
      statements: 28,
    },
    './src/components/ui/': {
      branches: 16,
      functions: 9,
      lines: 14,
      statements: 13,
    },
  },
  coverageReporters: ['text', 'lcov', 'html', 'json'],
  coverageDirectory: '<rootDir>/coverage',
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/src/$1',
  },
  transform: {
    // ts-jest 需要明确指定 jsx: 'react-jsx'，因为项目 tsconfig 使用 'preserve'
    // 由后续 SWC/Babel 处理，但 Jest 环境下没有这些工具链
    '^.+\\.(ts|tsx)$': ['ts-jest', { tsconfig: { jsx: 'react-jsx' } }],
  },
  transformIgnorePatterns: [
    'node_modules/(?!(nanoid|next-auth|@auth)/)',
  ],
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  testTimeout: 10000,
  verbose: true,
  maxWorkers: '50%',
};