/**
 * SpecialSchoolNote — the context note shown on special-school / PRU / AP
 * detail pages explaining why the mainstream England-average comparison is
 * dropped. Renders nothing for mainstream schools.
 *
 * The copy is type-aware: only genuine special schools have pupils with special
 * educational needs. Pupil referral units and alternative provision teach
 * pupils educated outside a mainstream setting (e.g. after exclusion, or for
 * medical reasons) who are not necessarily SEND — so their note says so rather
 * than mischaracterising them. Suppressing the England comparison is reasonable
 * for all three.
 */

import { isSpecialSchool } from '@/lib/utils';
import styles from './SpecialSchoolNote.module.css';

type SpecialKind = 'special' | 'pru' | 'ap';

function specialKind(schoolType: string | null | undefined): SpecialKind {
  const t = (schoolType ?? '').toLowerCase();
  if (/pupil referral/.test(t)) return 'pru';
  if (/alternative provision/.test(t)) return 'ap';
  return 'special';
}

export function SpecialSchoolNote({ school }: { school: { school_type?: string | null } }) {
  if (!isSpecialSchool(school)) return null;
  const kind = specialKind(school.school_type);

  return (
    <div className={styles.note} role="note">
      {kind === 'special' && (
        <>
          <strong>This is a special school.</strong> Its pupils have special educational needs and
          work towards individual targets. They sit the same national assessments, but very few
          reach the mainstream &ldquo;expected standard&rdquo; these measures report, so a
          comparison with the England average isn&rsquo;t a meaningful guide to the school.
        </>
      )}
      {kind === 'pru' && (
        <>
          <strong>This is a pupil referral unit.</strong> It teaches pupils educated outside a
          mainstream school, for example after exclusion or for medical or behavioural reasons.
          The mainstream &ldquo;expected standard&rdquo; and the England-average comparison
          aren&rsquo;t a meaningful guide to the school.
        </>
      )}
      {kind === 'ap' && (
        <>
          <strong>This is an alternative provision setting.</strong> It teaches pupils educated
          outside a mainstream school. The mainstream &ldquo;expected standard&rdquo; and the
          England-average comparison aren&rsquo;t a meaningful guide to the school.
        </>
      )}{' '}
      Where available, the progress its pupils make is a fairer measure.
    </div>
  );
}