export const HEALTH_SYMPTOM_CODES = Object.freeze([
  'none',
  'dizziness',
  'headache',
  'chest_tightness',
  'palpitation',
  'fatigue',
  'shortness_of_breath',
  'leg_edema',
  'insomnia',
  'other',
]);

export const HEALTH_SYMPTOM_LABELS = Object.freeze({
  none: '无',
  dizziness: '头晕',
  headache: '头痛',
  chest_tightness: '胸闷',
  palpitation: '心慌心悸',
  fatigue: '乏力',
  shortness_of_breath: '气短',
  leg_edema: '下肢水肿',
  insomnia: '失眠',
  other: '其他',
});

export const HEALTH_SYMPTOM_SEVERITIES = Object.freeze([1, 2, 3]);

export function normalizeSymptomCode(value) {
  const raw = String(value ?? '').trim();
  if (HEALTH_SYMPTOM_CODES.includes(raw)) return raw;
  const byLabel = Object.entries(HEALTH_SYMPTOM_LABELS).find(([, label]) => label === raw);
  return byLabel ? byLabel[0] : null;
}

export function assertSymptomRecord({ code, severity, note = '' } = {}) {
  const symptom = normalizeSymptomCode(code);
  if (!symptom) {
    return { ok: false, error: 'unknown_symptom' };
  }
  if (symptom === 'none') {
    return { ok: true, code: 'none', severity: null, note: String(note ?? '').trim() || null };
  }
  const level = Number(severity);
  if (!HEALTH_SYMPTOM_SEVERITIES.includes(level)) {
    return { ok: false, error: 'invalid_severity' };
  }
  return { ok: true, code: symptom, severity: level, note: String(note ?? '').trim() || null };
}