import assert from 'node:assert/strict';
import { readdir } from 'node:fs/promises';
import test from 'node:test';
import { legacyBachelorRedirects } from '../src/config/legacy-bachelor-redirects.mjs';

async function routes(directory, prefix = '') {
  const entries = await readdir(directory, { withFileTypes: true });
  const found = [];
  for (const entry of entries) {
    const relative = `${prefix}${entry.name}`;
    if (entry.isDirectory()) found.push(...await routes(`${directory}/${entry.name}`, `${relative}/`));
    else if (/\.mdx?$/.test(entry.name)) {
      const stem = relative.replace(/\.mdx?$/, '').replace(/index$/, '');
      found.push(`/data-science-and-ai/${stem}`.replace(/\/+/g, '/'));
    }
  }
  return found.sort();
}

test('every Data Science & AI page has an exact legacy bachelor redirect', async () => {
  const canonical = await routes('src/content/docs/data-science-and-ai');
  const expected = Object.fromEntries(canonical.map((target) => [target.replace('/data-science-and-ai/', '/bachelor/'), target]));
  assert.deepEqual(legacyBachelorRedirects, expected);
  assert.equal(legacyBachelorRedirects['/bachelor/'], '/data-science-and-ai/');
  assert.equal(legacyBachelorRedirects['/bachelor/year-1/block-2/calculus'], '/data-science-and-ai/year-1/block-2/calculus');
});