/* eslint-env jest */
import fs from 'fs';
import path from 'path';

const SRC = path.resolve(__dirname, '../../..');

/** Every .tsx file under src, tests aside. */
const sources = (dir: string): string[] =>
  fs.readdirSync(dir, { withFileTypes: true }).flatMap(entry => {
    const full = path.join(dir, entry.name);
    if (entry.isDirectory()) {
      return entry.name === '__tests__' ? [] : sources(full);
    }

    return full.endsWith('.tsx') ? [full] : [];
  });

it('renders every link-shaped Button as a link to Base UI', () => {
  // A Button drawn as <a> or <Link> keeps button semantics unless told
  // otherwise: "disabled" lands on the anchor, where it means nothing to a
  // screen reader, and Base UI logs an error.
  const missing: string[] = [];
  for (const file of sources(SRC)) {
    const text = fs.readFileSync(file, 'utf8');
    const buttons = text.matchAll(
      /<Button\b((?:[^<>]|<(?!\/?Button\b)[^>]*>)*?)>/gs
    );
    for (const match of buttons) {
      const attributes = match[1];
      if (
        /render=\{\s*<(a|Link)\b/.test(attributes) &&
        !attributes.includes('nativeButton')
      ) {
        const line = text.slice(0, match.index).split('\n').length;
        missing.push(`${path.relative(SRC, file)}:${line}`);
      }
    }
  }

  expect(missing).toEqual([]);
});