// ============================================================
// PE-GUIDE DATA — ported verbatim from public/js/peGuide.js
// (lines 23-311 of the vanilla file, as of commit before this one).
//
// This file ONLY contains the stable reference data:
//   • SCALES         — grading scales (MRC, DTR, Levine, Beighton, …)
//   • SYSTEM_SCALES  — which scales belong to which body system
//   • APTM_LEGEND    — the 5 cardiac auscultation points
//   • INNOCENT_MURMURS — benign childhood murmurs
//   • RESP_SOUNDS    — respiratory sounds library (audio paths)
//   • CARDIAC_SOUNDS — cardiac sounds library (audio paths)
//
// PE_DATA (the full age-group × system × component × step hierarchy,
// ~1000 lines) is intentionally NOT ported here. It holds clinically
// reviewed content and the migration checkpoint explicitly warns
// "An LLM will sometimes 'simplify' a long array — don't let that
// happen." PE_DATA port belongs in its own dedicated session with
// per-entry counts + visual diff verification against the vanilla
// source. Until that session, the React PE Guide surfaces the
// reference libraries below and links to the legacy viewer for
// exam-step checklists and narrative generation.
//
// Audio files stay in public/audio/respiratory/ and public/audio/cardiac/
// and are served unchanged from Express.
// ============================================================

export interface ScaleDef {
  title: string;
  icon: string;
  rows: Array<[string, string]>;
}

export const SCALES: Record<string, ScaleDef> = {
  mrc: {
    title: 'MRC strength grade (0–5)',
    icon: 'fa-hand-fist',
    rows: [
      ['5', 'Normal power — holds against full resistance'],
      ['4', 'Reduced — moves against gravity + some resistance'],
      ['3', 'Moves against gravity only (no added resistance)'],
      ['2', 'Full range with gravity eliminated (horizontal plane)'],
      ['1', 'Flicker / trace contraction, no joint movement'],
      ['0', 'No contraction'],
    ],
  },
  dtr: {
    title: 'Deep-tendon reflex grade (0–4+)',
    icon: 'fa-circle-dot',
    rows: [
      ['0',  'Absent'],
      ['1+', 'Hypoactive — trace, only with reinforcement'],
      ['2+', 'Normal'],
      ['3+', 'Brisk — may still be normal in anxious patients'],
      ['4+', 'Hyperactive with sustained clonus — always abnormal'],
    ],
  },
  plantar: {
    title: 'Plantar response (Babinski)',
    icon: 'fa-shoe-prints',
    rows: [
      ['Down-going', 'Normal in anyone ≥ 2 years'],
      ['Up-going',   'Normal < 2 years; abnormal after — UMN lesion'],
      ['Asymmetric', 'Always abnormal at any age'],
    ],
  },
  beighton: {
    title: 'Beighton hypermobility score (0–9)',
    icon: 'fa-hands',
    rows: [
      ['≤ 3', 'Normal flexibility'],
      ['4',   'Borderline — consider in context'],
      ['≥ 5', 'Hypermobility spectrum; screen for hEDS if other features present'],
    ],
  },
  atr: {
    title: 'Scoliometer — angle of trunk rotation',
    icon: 'fa-ruler',
    rows: [
      ['< 5°',  'Normal, no follow-up'],
      ['5–6°',  'Borderline — re-check at each visit'],
      ['≥ 7°',  'Refer for PA/lateral spine x-ray + orthopedic evaluation'],
    ],
  },
  rr: {
    title: 'Respiratory rate — upper limit by age (awake)',
    icon: 'fa-lungs',
    rows: [
      ['Newborn',       '≤ 60 /min'],
      ['< 2 months',    '≤ 60 /min (WHO tachypnea cutoff)'],
      ['2–12 months',   '≤ 50 /min (WHO tachypnea cutoff)'],
      ['1–5 years',     '≤ 40 /min (WHO tachypnea cutoff)'],
      ['6–11 years',    '≤ 30 /min'],
      ['≥ 12 years',    '≤ 20 /min (adult pattern)'],
    ],
  },
  spo2: {
    title: 'Pulse oximetry (SpO₂) — at room air',
    icon: 'fa-heart-pulse',
    rows: [
      ['≥ 95%',   'Normal'],
      ['92–94%',  'Mild hypoxemia — investigate cause'],
      ['< 92%',   'Moderate hypoxemia — supplemental O₂'],
      ['< 88%',   'Severe — urgent intervention; target ≥ 90% acutely'],
    ],
  },
  silverman: {
    title: 'Silverman–Andersen retraction score (neonatal, 0–10)',
    icon: 'fa-baby',
    rows: [
      ['0',     'No respiratory distress'],
      ['1–3',   'Mild — close observation'],
      ['4–6',   'Moderate distress — consider CPAP / support'],
      ['7–10',  'Severe — imminent respiratory failure, intubate'],
    ],
  },
  westley: {
    title: 'Westley croup severity score',
    icon: 'fa-stethoscope',
    rows: [
      ['≤ 2',    'Mild — home management, cool mist, oral dexamethasone'],
      ['3–5',    'Moderate — nebulised epinephrine + dexamethasone'],
      ['6–11',   'Severe — admit, continuous monitoring'],
      ['≥ 12',   'Impending respiratory failure — ICU / airway management'],
    ],
  },
  murmurGrade: {
    title: 'Heart-murmur grading (Levine 1–6)',
    icon: 'fa-wave-square',
    rows: [
      ['1/6',   'Very faint — heard only with concentration'],
      ['2/6',   'Soft but readily heard'],
      ['3/6',   'Moderately loud, no thrill'],
      ['4/6',   'Loud WITH a palpable thrill'],
      ['5/6',   'Very loud; audible with stethoscope just off the chest'],
      ['6/6',   'Audible without the stethoscope touching the chest'],
    ],
  },
  pulseAmp: {
    title: 'Pulse amplitude grade (0–4)',
    icon: 'fa-heart-pulse',
    rows: [
      ['0',   'Absent'],
      ['1+',  'Diminished, thready'],
      ['2+',  'Normal'],
      ['3+',  'Bounding'],
      ['4+',  'Bounding with visible pulsation (e.g., aortic regurgitation)'],
    ],
  },
  capRefill: {
    title: 'Capillary refill time',
    icon: 'fa-hand',
    rows: [
      ['< 2 sec',  'Normal'],
      ['2–3 sec',  'Borderline — consider hydration / perfusion'],
      ['≥ 3 sec',  'Delayed — dehydration, shock, low cardiac output'],
    ],
  },
};

export const SYSTEM_SCALES: Record<string, string[]> = {
  msk:   ['atr', 'beighton'],
  neuro: ['mrc', 'dtr', 'plantar'],
  resp:  ['rr', 'spo2', 'silverman', 'westley'],
  cv:    ['murmurGrade', 'pulseAmp', 'capRefill'],
};

// APTM — the 5 classic cardiac auscultation points
export interface AptmEntry {
  letter: string;
  color: string;
  title: string;
  location: string;
  listen: string;
  innocent?: string;
}
export const APTM_LEGEND: AptmEntry[] = [
  { letter: 'A', color: '#dc2626', title: 'Aortic area',      location: '2nd ICS, right sternal border',       listen: 'S2 (aortic component), aortic stenosis, aortic regurgitation' },
  { letter: 'P', color: '#2563eb', title: 'Pulmonic area',    location: '2nd ICS, left sternal border',        listen: 'S2 (pulmonic component), pulmonic stenosis, PDA, physiologic split of S2',
    innocent: 'Pulmonary flow murmur (children, adolescents) — upper left sternal border' },
  { letter: 'E', color: '#059669', title: 'Erb\'s point',     location: '3rd ICS, left sternal border',        listen: 'Aortic regurgitation (best here), transitional zone murmurs',
    innocent: 'Still\'s murmur classically radiates to Erb\'s / LLSB' },
  { letter: 'T', color: '#d97706', title: 'Tricuspid area',   location: '4th–5th ICS, lower left sternal border', listen: 'Tricuspid regurgitation, VSD, S3/S4, holosystolic murmurs',
    innocent: 'Still\'s murmur — vibratory, musical, age 3–7 y (loudest between LLSB and apex)' },
  { letter: 'M', color: '#7c3aed', title: 'Mitral area (apex)', location: '5th ICS, mid-clavicular line',      listen: 'S1, mitral regurgitation, mitral stenosis (with bell, left-lateral decubitus)' },
];

// Innocent (benign) childhood murmurs
export interface InnocentMurmur {
  name: string;
  age: string;
  location: string;
  character: string;
  confirm: string;
}
export const INNOCENT_MURMURS: InnocentMurmur[] = [
  { name: 'Still\'s (vibratory) murmur',
    age: '3–7 y (most common in children)',
    location: 'LLSB, radiating to apex',
    character: 'Low-frequency vibratory / musical systolic, grade 2–3/6, mid-systolic, "twanging-string" quality',
    confirm: 'Louder supine, softer or disappears on standing or Valsalva. No radiation to neck/back. Normal S2.' },
  { name: 'Pulmonary flow murmur',
    age: 'School-age and adolescents, thin chest',
    location: 'Upper left sternal border (2nd–3rd ICS)',
    character: 'Soft blowing early systolic ejection, grade 1–2/6, higher-pitched',
    confirm: 'No ejection click. Physiologic split of S2. Louder supine, softer on standing. No radiation.' },
  { name: 'Venous hum',
    age: 'Ages 3–8, disappears by adolescence',
    location: 'Supraclavicular or infraclavicular area, usually right',
    character: 'Soft continuous hum, louder in diastole. Only innocent continuous murmur.',
    confirm: 'Disappears when supine OR when jugular vein is gently compressed (key maneuver). Turning head to opposite side also alters it.' },
  { name: 'Carotid bruit / supraclavicular bruit',
    age: 'Children and adolescents',
    location: 'Supraclavicular fossa, right > left; may radiate to carotid',
    character: 'Brief early systolic, grade 2–3/6, higher-pitched than Still\'s',
    confirm: 'Softer or disappears with hyperextension of the shoulders. Normal cardiac exam otherwise. No radiation below the clavicles.' },
  { name: 'Peripheral pulmonary stenosis (PPS, neonatal)',
    age: 'Newborns and infants < 6–12 months',
    location: 'Upper LSB, radiates to BOTH axillae and the back',
    character: 'Soft systolic ejection murmur, grade 1–2/6',
    confirm: 'Typical age + radiation to back/axillae. Resolves by age 1 as branch pulmonary arteries grow. Persistence or louder grade warrants echo.' },
];

// Respiratory sounds library — real recordings served from /public/audio/respiratory/
export interface SoundEntry {
  key: string;
  src: string;
  title: string;
  where: string;
  rate?: string;
  features: string;
  clinical: string;
}
export const RESP_SOUNDS: SoundEntry[] = [
  { key: 'normal',         src: '/audio/respiratory/normal-vesicular.ogg', title: 'Normal vesicular breath sounds',
    where: 'Peripheral lung fields',
    features: 'Soft, rustling. Inspiration louder and longer than expiration.',
    clinical: 'Baseline — deviation elsewhere is what you listen for.' },
  { key: 'wheeze',         src: '/audio/respiratory/wheeze.ogg',      title: 'Wheeze',
    where: 'Diffuse in asthma; localised in foreign body',
    features: 'Continuous, high-pitched, musical. Usually expiratory; biphasic if severe.',
    clinical: 'Lower-airway narrowing — asthma, bronchiolitis, foreign body, bronchomalacia. Silent chest in severe asthma is an ominous sign.' },
  { key: 'stridor',        src: '/audio/respiratory/stridor.ogg',     title: 'Stridor',
    where: 'Louder over neck than chest — upper airway',
    features: 'Continuous, high-pitched, harsh. Classically inspiratory (extrathoracic obstruction); biphasic if fixed.',
    clinical: 'Croup, epiglottitis, foreign body, laryngomalacia (infant). Distinguish from wheeze by auscultating the neck — stridor is loudest there.' },
  { key: 'finecrackles',   src: '/audio/respiratory/crackles-fine.ogg',   title: 'Fine (end-inspiratory) crackles',
    where: 'Bibasilar in pulmonary edema/fibrosis; focal in pneumonia',
    features: 'Discontinuous, brief, high-pitched. "Velcro" quality. Late inspiratory, do NOT clear with cough.',
    clinical: 'Alveolar opening — pulmonary fibrosis, pulmonary edema, early pneumonia, atelectasis.' },
  { key: 'coarsecrackles', src: '/audio/respiratory/crackles-coarse.ogg', title: 'Coarse crackles',
    where: 'Lower lobes; either side',
    features: 'Discontinuous, longer and louder than fine crackles. Lower-pitched. Can be early or late inspiratory; often clear partly with cough.',
    clinical: 'Secretions in larger airways — bronchitis, later pneumonia, bronchiectasis, aspiration.' },
  { key: 'rhonchi',        src: '/audio/respiratory/rhonchi.ogg',    title: 'Rhonchi',
    where: 'Central or anywhere with airway secretions',
    features: 'Continuous, low-pitched, snore-like. Typically expiratory. Clear or change with cough.',
    clinical: 'Large-airway secretions — bronchitis, pneumonia with large-airway involvement, cystic fibrosis, bronchiectasis.' },
  { key: 'pleuralrub',     src: '/audio/respiratory/pleural-rub.ogg', title: 'Pleural friction rub',
    where: 'Focal, often lateral or posterior lower chest',
    features: 'Grating, creaky — "leather on leather". Biphasic (heard in inspiration and expiration). Does NOT clear with cough.',
    clinical: 'Pleural inflammation — pleuritis, pulmonary embolism, pneumonia with pleural involvement, viral pleurisy.' },
];

// Cardiac sounds library — real recordings from Wikimedia Commons
export const CARDIAC_SOUNDS: SoundEntry[] = [
  { key: 'normal', src: '/audio/cardiac/normal.ogg', title: 'Normal heart sounds (S1, S2)',
    where: 'All four classic auscultation points', rate: '~61 bpm reference',
    features: '"lub-dub": S1 (closure of mitral + tricuspid) louder at apex; S2 (closure of aortic + pulmonic) louder at base. Physiologic S2 split on inspiration.',
    clinical: 'Reference for rhythm, rate, and the normal S1–S2 interval. Listen for what\'s changed — not just what\'s added.' },
  { key: 'infant-normal', src: '/audio/cardiac/infant-normal.ogg', title: 'Infant normal heart sounds',
    where: 'Infant chest — rate will be higher than adult', rate: 'Pediatric reference (120–160 bpm range)',
    features: 'Same S1–S2 pattern, faster rate. Short diastole makes murmurs easier to miss — careful auscultation needed.',
    clinical: 'Reference for neonatal/infant rhythm. Any murmur in the first 72 h should prompt pre/postductal sat screening.' },
  { key: 'vsd', src: '/audio/cardiac/vsd.wav', title: 'Ventricular septal defect (VSD)',
    where: 'Lower left sternal border (4th ICS)',
    features: 'Harsh, blowing, holosystolic (pansystolic) murmur — plateau shape through all of systole. Often accompanied by a thrill if large.',
    clinical: 'Most common congenital heart defect. Small VSD: loud murmur, usually asymptomatic, may close spontaneously. Large VSD: softer murmur (less pressure gradient) but signs of heart failure, pulmonary hypertension.' },
  { key: 'mvp', src: '/audio/cardiac/mitral-prolapse.wav', title: 'Mitral valve prolapse (MVP) — click + late systolic murmur',
    where: 'Apex (5th ICS, mid-clavicular line)',
    features: 'Mid-systolic click followed by a late-systolic crescendo murmur. Timing of click changes with maneuvers: earlier with standing or Valsalva, later with squatting.',
    clinical: 'Often benign, especially in thin young women. Features suggesting need for echo: thickened/redundant leaflets, associated MR, symptoms (palpitations, chest pain), arrhythmias.' },
  { key: 'stills', src: '/audio/cardiac/stills-murmur.ogg', title: 'Still\'s murmur (innocent)',
    where: 'LLSB, radiating to apex', rate: 'Classic age 3–7 y (this recording is a toddler)',
    features: 'Low-frequency vibratory / musical systolic, grade 2–3/6, mid-systolic, "twanging-string" quality.',
    clinical: 'The most common innocent murmur of childhood. Louder supine, softer or disappears on standing or Valsalva. Normal S2. No radiation to neck or back. No workup needed when classic.' },
  { key: 'functional', src: '/audio/cardiac/functional-murmur.wav', title: 'Functional (innocent) murmur — adult female',
    where: 'Left sternal border, soft systolic',
    features: 'Soft systolic murmur in a structurally normal heart — often from increased cardiac output, thin chest wall, anemia, hyperthyroidism, or pregnancy.',
    clinical: 'Benign if it meets the 7 S criteria. Investigate if loud (≥3/6), holosystolic, diastolic, radiating, or with thrill / symptoms.' },
];