// @ts-check
import tseslint from '@typescript-eslint/eslint-plugin';
import tsparser from '@typescript-eslint/parser';

/**
 * Flat ESLint config for ESLint 9.x.
 * Migrated from .eslintrc.cjs which required legacy mode.
 *
 * Rules mirror the original: recommended + recommended-requiring-type-checking
 * plus project-specific overrides.
 */

/** @type {import('eslint').Linter.Config[]} */
const config = [
  // ── Global ignores ──────────────────────────────────────────────────────────
  {
    ignores: [
      '**/dist/**',
      '**/node_modules/**',
      '**/*.d.ts',
      'eslint.config.js',
      'vitest.config.ts',
    ],
  },

  // ── Source files (with project-based type checking) ─────────────────────────
  {
    files: ['packages/*/src/**/*.ts', 'servers/*/src/**/*.ts'],
    languageOptions: {
      parser: tsparser,
      parserOptions: {
        project: [
          './packages/calendar/tsconfig.json',
          './packages/gmail/tsconfig.json',
          './packages/google-maps/tsconfig.json',
          './packages/internal-data/tsconfig.json',
          './packages/knowledge-base/tsconfig.json',
          './packages/payments/tsconfig.json',
          './packages/qbo/tsconfig.json',
          './packages/reminders/tsconfig.json',
          './packages/shared/tsconfig.json',
          './packages/tasks/tsconfig.json',
          './servers/sh-mcp-ops/tsconfig.json',
          './servers/sh-mcp-finance/tsconfig.json',
        ],
        tsconfigRootDir: import.meta.dirname,
      },
      globals: {
        process: 'readonly',
        console: 'readonly',
      },
    },
    plugins: {
      '@typescript-eslint': tseslint,
    },
    rules: {
      'no-undef': 'off', // TypeScript handles this
      'no-unused-vars': 'off', // Use @typescript-eslint version

      // Core @typescript-eslint/recommended rules
      '@typescript-eslint/ban-ts-comment': 'error',
      '@typescript-eslint/no-array-constructor': 'error',
      '@typescript-eslint/no-duplicate-enum-values': 'error',
      '@typescript-eslint/no-explicit-any': 'warn',
      '@typescript-eslint/no-extra-non-null-assertion': 'error',
      '@typescript-eslint/no-misused-new': 'error',
      '@typescript-eslint/no-namespace': 'error',
      '@typescript-eslint/no-non-null-asserted-optional-chain': 'error',
      '@typescript-eslint/no-require-imports': 'error',
      '@typescript-eslint/no-this-alias': 'error',
      '@typescript-eslint/no-unnecessary-type-constraint': 'error',
      '@typescript-eslint/no-unsafe-declaration-merging': 'error',
      '@typescript-eslint/no-unused-expressions': 'error',
      '@typescript-eslint/prefer-as-const': 'error',
      '@typescript-eslint/prefer-namespace-keyword': 'error',
      '@typescript-eslint/triple-slash-reference': 'error',

      // Type-checked rules (require-type-checking)
      '@typescript-eslint/no-floating-promises': 'error',
      '@typescript-eslint/no-misused-promises': 'error',
      '@typescript-eslint/no-unsafe-argument': 'warn',
      '@typescript-eslint/no-unsafe-assignment': 'warn',
      '@typescript-eslint/no-unsafe-call': 'warn',
      '@typescript-eslint/no-unsafe-member-access': 'warn',
      '@typescript-eslint/no-unsafe-return': 'warn',
      '@typescript-eslint/require-await': 'warn',
      '@typescript-eslint/restrict-template-expressions': 'warn',

      // Project-specific overrides
      '@typescript-eslint/explicit-function-return-type': 'warn',
      '@typescript-eslint/no-unused-vars': [
        'error',
        {
          argsIgnorePattern: '^_',
          varsIgnorePattern: '^_',
        },
      ],
      '@typescript-eslint/strict-boolean-expressions': 'warn',
    },
  },

  // ── Test files + CDK synth apps (no project-based type checking) ────────────
  // test/ dirs and cdk/ apps are excluded from the package/server tsconfigs, so
  // type-checked rules are disabled here to avoid "file not in project" errors.
  {
    files: ['packages/*/test/**/*.ts', 'servers/*/test/**/*.ts', 'servers/*/cdk/**/*.ts'],
    languageOptions: {
      parser: tsparser,
      parserOptions: {
        // No `project` here — avoids "file not found in project" errors for
        // test files that are excluded from the package tsconfigss.
        // Type-checking rules are disabled below.
      },
      globals: {
        process: 'readonly',
        console: 'readonly',
      },
    },
    plugins: {
      '@typescript-eslint': tseslint,
    },
    rules: {
      'no-undef': 'off',
      'no-unused-vars': 'off',
      '@typescript-eslint/no-explicit-any': 'warn',
      '@typescript-eslint/no-unused-vars': [
        'error',
        {
          argsIgnorePattern: '^_',
          varsIgnorePattern: '^_',
        },
      ],
    },
  },
];

export default config;