// ESLint config for the extension.
//
// The "no download logic in extension/" rule (CLAUDE.md §3) used to be prose only.
// GUI turned its half into a ctest (gui/tests/no_download_logic.cmake); this is EXT's
// equivalent — a build-failing gate instead of something a reviewer has to remember to
// look for. See gui/docs/ext-requests-m1.md for the request this answers.
//
// The extension's whole job is: collect URL + headers + cookies, hand them to veloxd,
// render what comes back. It must never fetch bytes, assemble a Range request, or read
// a response body itself — that is download logic, and it belongs in core/daemon only.
import js from '@eslint/js';
import tseslint from 'typescript-eslint';

const noDownloadLogic = {
  name: 'velox/no-download-logic',
  files: ['src/**/*.ts'],
  rules: {
    'no-restricted-syntax': [
      'error',
      {
        selector: "NewExpression[callee.name='XMLHttpRequest']",
        message:
          'No XMLHttpRequest in extension/ — the extension hands URLs to veloxd, it never fetches bytes itself (CLAUDE.md §3).',
      },
      {
        selector: "NewExpression[callee.name='Request']",
        message:
          'No `new Request(...)` in extension/ — that is download-side plumbing. Hand the URL to veloxd instead (CLAUDE.md §3).',
      },
      {
        selector: "CallExpression[callee.name='fetch']",
        message:
          'No fetch() in extension/ — the extension never retrieves download bytes itself (CLAUDE.md §3). Talking to veloxd goes through transport/, not fetch.',
      },
      {
        selector: "MemberExpression[property.name='getReader']",
        message:
          'No ReadableStream reader in extension/ — reading a response body here is download logic (CLAUDE.md §3); the daemon owns transfer bytes.',
      },
      {
        selector:
          "Property[key.name='Range'], Property[key.name='range'], Property[key.name='Content-Range'], Property[key.name='content-range']",
        message:
          'No Range/Content-Range header construction in extension/ — resumption is the daemon\'s job (CLAUDE.md §3, docs/05).',
      },
      {
        selector: "NewExpression[callee.object.name='indexedDB'], CallExpression[callee.object.name='indexedDB']",
        message: 'No IndexedDB in extension/ for moving bytes — hand off to veloxd instead (CLAUDE.md §3).',
      },
    ],
    'no-restricted-globals': [
      'error',
      { name: 'fetch', message: 'No fetch() in extension/ — see CLAUDE.md §3.' },
      { name: 'XMLHttpRequest', message: 'No XMLHttpRequest in extension/ — see CLAUDE.md §3.' },
      { name: 'indexedDB', message: 'No IndexedDB in extension/ — see CLAUDE.md §3.' },
    ],
  },
};

export default tseslint.config(
  {
    // src/shared/protocol/** is generated (contracts/codegen/gen_ts.py) and must never
    // be hand-edited — linting it as if we could fix a finding would be a lie.
    ignores: ['dist/**', 'node_modules/**', 'scripts/**', 'src/shared/protocol/**'],
  },
  js.configs.recommended,
  ...tseslint.configs.recommended,
  {
    files: ['src/**/*.ts', 'tests/**/*.ts'],
    languageOptions: {
      parserOptions: {
        project: false,
      },
    },
    rules: {
      '@typescript-eslint/no-explicit-any': 'error',
      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
    },
  },
  noDownloadLogic,
  {
    // Tests legitimately construct fake Requests/fetch mocks to exercise transport code
    // against a fake server; the rule protects src/, not the harness that pokes at it.
    files: ['tests/**/*.ts'],
    rules: {
      'no-restricted-syntax': 'off',
      'no-restricted-globals': 'off',
    },
  },
);