import { validateBloodPressurePair, validateMetricValue } from './health-observation-validate.mjs';

export const EXTRACTION_CONFIDENCE_MIN = 0.9;

const METRIC_SET_FIELDS = Object.freeze({
  blood_pressure: ['systolic', 'diastolic'],
  heart_rate: ['hr'],
  weight: ['weight'],
  spo2: ['spo2'],
  temperature: ['temperature'],
});

export function validateExtractionResult(extracted = {}, { metricSetHint = null } = {}) {
  const metricSet = extracted.metric_set || metricSetHint;
  if (!metricSet || !METRIC_SET_FIELDS[metricSet]) {
    return { ok: false, error: 'unknown_metric_set', unreadable: true };
  }
  const confidence = extracted.confidence && typeof extracted.confidence === 'object'
    ? extracted.confidence
    : {};
  const lowConfidence = [];
  const values = {};

  if (metricSet === 'blood_pressure') {
    const pair = validateBloodPressurePair(extracted.systolic, extracted.diastolic);
    if (!pair.ok) {
      return { ok: false, error: pair.error, unreadable: pair.error === 'out_of_range', field: pair.field };
    }
    values.systolic = pair.systolic;
    values.diastolic = pair.diastolic;
    if (extracted.pulse != null) {
      const pulse = validateMetricValue('hr', extracted.pulse);
      if (!pulse.ok) return { ok: false, error: pulse.error, field: 'pulse' };
      values.pulse = pulse.value;
    }
  } else {
    const field = METRIC_SET_FIELDS[metricSet][0];
    const metricType = metricSet === 'heart_rate' ? 'hr' : metricSet === 'weight' ? 'weight' : metricSet;
    const checked = validateMetricValue(metricType, extracted[field] ?? extracted.value);
    if (!checked.ok) return { ok: false, error: checked.error, unreadable: checked.error === 'out_of_range' };
    values[field] = checked.value;
  }

  for (const field of Object.keys(values)) {
    const score = Number(confidence[field] ?? extracted.confidence?.[field] ?? 1);
    if (score < EXTRACTION_CONFIDENCE_MIN) lowConfidence.push(field);
  }

  return {
    ok: true,
    metricSet,
    values,
    lowConfidence,
    requireConfirm: true,
    unreadable: false,
  };
}