import { metadata as homeMetadata } from '@/app/page';
import { metadata as rankingsMetadata } from '@/app/rankings/page';
import { metadata as admissionsMetadata } from '@/app/admissions/page';
import { generateMetadata as compareMetadata } from '@/app/compare/page';

describe('canonical URLs', () => {
  it('the homepage canonicalises to the bare root', () => {
    // page.tsx reads eleven search params. Without this, every filter
    // combination is a crawlable near-duplicate of the one page we want to
    // rank for "compare schools".
    expect(homeMetadata.alternates?.canonical)
      .toBe('https://www.schoolcompare.co.uk/');
  });

  it('rankings canonicalises to the bare path', () => {
    expect(rankingsMetadata.alternates?.canonical)
      .toBe('https://www.schoolcompare.co.uk/rankings');
  });

  it('admissions canonicalises to the bare path', () => {
    expect(admissionsMetadata.alternates?.canonical)
      .toBe('https://www.schoolcompare.co.uk/admissions');
  });
});

describe('/compare indexability', () => {
  it('the bare compare page is indexable and canonical to itself', async () => {
    // This is the landing page for the "compare schools" head term.
    const meta = await compareMetadata({ searchParams: Promise.resolve({}) });
    expect(meta.alternates?.canonical)
      .toBe('https://www.schoolcompare.co.uk/compare');
    expect(meta.robots).toBeUndefined();
  });

  it('a comparison of specific schools is noindex, follow', async () => {
    // ~317 million pairs before triples. Indexing the parameter space would
    // swamp everything else in the corpus.
    const meta = await compareMetadata({
      searchParams: Promise.resolve({ urns: '100001,100002' }),
    });
    expect(meta.robots).toEqual({ index: false, follow: true });
  });

  it('a parameterised comparison still canonicalises to the bare path', async () => {
    // follow:true plus a canonical means the outbound links to each school
    // page still pass value even though this URL is not indexed.
    const meta = await compareMetadata({
      searchParams: Promise.resolve({ urns: '100001,100002' }),
    });
    expect(meta.alternates?.canonical)
      .toBe('https://www.schoolcompare.co.uk/compare');
  });
});