import { computeSecondaryFlags, buildSecondaryNavItems } from '@/lib/schoolSections';
import type { School, SchoolDestinations } from '@/lib/types';

const schoolInfo = {
  urn: 137083, school_name: 'Northbrook Academy', phase: 'Secondary',
  has_sixth_form: true,
} as unknown as School;

const base = { schoolInfo, yearlyData: [], deprivation: null, finance: null };

const phase = (categories = 1) => ({
  cohort_year: '2022/23',
  groups: {
    all: {
      cohort: 180,
      categories: Array.from({ length: categories }, () => ({
        category: 'school_sixth_form' as const,
        pupils: 75, percentage: 41.7, status: 'published' as const,
      })),
    },
  },
});

const ks4Only: SchoolDestinations = { ks4: phase(), ks5: null };
const both: SchoolDestinations = { ks4: phase(), ks5: phase() };

describe('computeSecondaryFlags — destinations', () => {
  it('flags KS4 destinations when the block carries categories', () => {
    const flags = computeSecondaryFlags({ ...base, destinations: ks4Only });
    expect(flags.hasKs4Destinations).toBe(true);
    expect(flags.hasKs5Destinations).toBe(false);
  });

  it('flags both phases when both are present', () => {
    const flags = computeSecondaryFlags({ ...base, destinations: both });
    expect(flags.hasKs4Destinations).toBe(true);
    expect(flags.hasKs5Destinations).toBe(true);
  });

  it('flags neither when the block is absent', () => {
    const flags = computeSecondaryFlags({ ...base, destinations: null });
    expect(flags.hasKs4Destinations).toBe(false);
    expect(flags.hasKs5Destinations).toBe(false);
  });

  it('does not flag a phase whose groups carry no categories', () => {
    const empty: SchoolDestinations = {
      ks4: { cohort_year: '2022/23', groups: {} }, ks5: null,
    };
    expect(computeSecondaryFlags({ ...base, destinations: empty }).hasKs4Destinations)
      .toBe(false);
  });

  it('does not flag a phase whose only group has an empty category list', () => {
    const empty: SchoolDestinations = { ks4: phase(0), ks5: null };
    expect(computeSecondaryFlags({ ...base, destinations: empty }).hasKs4Destinations)
      .toBe(false);
  });
});

describe('buildSecondaryNavItems — destinations', () => {
  const navInput = {
    ofsted: null, admissions: null, admissionDistance: null,
    hasLocation: false, yearlyDataLength: 0,
  };

  it('adds both entries, after GCSEs', () => {
    const flags = computeSecondaryFlags({ ...base, destinations: both });
    const ids = buildSecondaryNavItems({ ...flags, hasResults: true }, navInput)
      .map(i => i.id);
    expect(ids).toContain('destinations');
    expect(ids).toContain('post16-destinations');
    expect(ids.indexOf('destinations')).toBeGreaterThan(ids.indexOf('gcse'));
    expect(ids.indexOf('post16-destinations')).toBe(ids.indexOf('destinations') + 1);
  });

  it('adds no entry for a phase that will not render — the nav must not link to a missing anchor', () => {
    const flags = computeSecondaryFlags({ ...base, destinations: null });
    const ids = buildSecondaryNavItems(flags, navInput).map(i => i.id);
    expect(ids).not.toContain('destinations');
    expect(ids).not.toContain('post16-destinations');
  });
});