// Regression test for the "no download logic in extension/" ESLint gate
// (eslint.config.mjs, answering gui/docs/ext-requests-m1.md). Runs ESLint's Node API
// directly against fixture source so a future edit to the rule set can't silently stop
// catching the patterns it was written for.
import { ESLint } from 'eslint';
import { describe, expect, it } from 'vitest';

async function lint(code: string): Promise<number> {
  const eslint = new ESLint({ cwd: new URL('../..', import.meta.url).pathname });
  // Path only needs to match the `files: ['src/**/*.ts']` glob in eslint.config.mjs.
  const [result] = await eslint.lintText(code, { filePath: 'src/background/__fixture.ts' });
  return result.messages.filter((m) => m.severity === 2).length;
}

describe('no-download-logic ESLint gate', () => {
  it('goes red on fetch() + a hand-built Range header + a stream reader', async () => {
    const errors = await lint(`
      export async function grabBytes(url: string) {
        const res = await fetch(url, { headers: { Range: 'bytes=0-1023' } });
        const reader = res.body!.getReader();
        return reader.read();
      }
    `);
    expect(errors).toBeGreaterThan(0);
  });

  it('goes red on XMLHttpRequest', async () => {
    const errors = await lint(`const x = new XMLHttpRequest();`);
    expect(errors).toBeGreaterThan(0);
  });

  it('stays green on ordinary transport/RPC code', async () => {
    const errors = await lint(`
      export function greet(name: string): string {
        return \`hello \${name}\`;
      }
    `);
    expect(errors).toBe(0);
  });
});