// Flat config for ESLint v9
import tseslint from 'typescript-eslint';
import astro from 'eslint-plugin-astro';
import astroParser from 'astro-eslint-parser';

export default [
  // Astro flat recommended
  ...astro.configs['flat/recommended'],

  // TS typed linting only for TS files
  ...tseslint.configs.recommendedTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,
  {
    files: ['**/*.{ts,tsx}'],
    languageOptions: {
      parser: tseslint.parser,
      parserOptions: {
        project: true,
        tsconfigRootDir: process.cwd(),
        sourceType: 'module',
        ecmaVersion: 'latest'
      }
    },
    plugins: { '@typescript-eslint': tseslint.plugin },
    rules: {
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/consistent-type-imports': ['error', { prefer: 'type-imports' }],
      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
      '@typescript-eslint/explicit-module-boundary-types': 'error',
      '@typescript-eslint/explicit-function-return-type': [
        'error',
        {
          allowExpressions: false,
          allowHigherOrderFunctions: true,
          allowDirectConstAssertionInArrowFunctions: true,
          allowTypedFunctionExpressions: true
        }
      ]
    }
  },

  // Astro files: use astro parser; do not inject TS typed rules here
  {
    files: ['**/*.astro'],
    languageOptions: {
      parser: astroParser,
      parserOptions: {
        parser: tseslint.parser,
        project: true,
        tsconfigRootDir: process.cwd(),
        ecmaVersion: 'latest',
        sourceType: 'module'
      }
    },
    plugins: { '@typescript-eslint': tseslint.plugin, astro },
    rules: {
      // 在 .astro 文件中放宽部分 type-aware 规则，避免模板区误报
      '@typescript-eslint/no-unsafe-return': 'off',
      '@typescript-eslint/no-unsafe-assignment': 'off',
      '@typescript-eslint/no-unsafe-member-access': 'off',
      '@typescript-eslint/non-nullable-type-assertion-style': 'off'
    }
  },

  // Allow triple-slash reference in env.d.ts for Astro types
  {
    files: ['src/env.d.ts'],
    rules: {
      '@typescript-eslint/triple-slash-reference': 'off'
    }
  },

  // Ignores
  { ignores: ['dist', 'node_modules', 'eslint.config.js', '.astro', 'astro.config.*', 'ref/**'] }
];