import js from '@eslint/js';
import tseslint from 'typescript-eslint';
import reactHooks from 'eslint-plugin-react-hooks';
import reactRefresh from 'eslint-plugin-react-refresh';
import globals from 'globals';

export default tseslint.config(
  // Ignore build output and generated artifacts.
  { ignores: ['dist', 'dev-dist', 'coverage'] },

  js.configs.recommended,

  // Type-aware linting for the TypeScript sources only.
  {
    files: ['**/*.{ts,tsx}'],
    extends: [...tseslint.configs.recommendedTypeChecked],
    languageOptions: {
      ecmaVersion: 2022,
      globals: { ...globals.browser, __APP_VERSION__: 'readonly' },
      parserOptions: {
        // Type-aware linting: powers no-floating-promises, no-misused-promises, etc.
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },
    plugins: {
      'react-hooks': reactHooks,
      'react-refresh': reactRefresh,
    },
    rules: {
      ...reactHooks.configs.recommended.rules,
      'react-refresh/only-export-components': ['warn', { allowConstantExport: true }],
      // Allow intentionally-unused args/vars when prefixed with _ (matches tsconfig intent).
      '@typescript-eslint/no-unused-vars': [
        'error',
        { argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
      ],
    },
  },

  // Tests exercise looser patterns and run in Node.
  {
    files: ['**/*.test.{ts,tsx}'],
    languageOptions: { globals: { ...globals.node } },
  },

  // Plain JS config files (this file, etc.) are not part of the TS project —
  // run them through the untyped ruleset only.
  {
    files: ['**/*.js'],
    extends: [tseslint.configs.disableTypeChecked],
    languageOptions: { globals: { ...globals.node } },
  },
);
