import 'package:fis_measure/interfaces/process/items/terms.dart';
import 'package:fis_measure/process/primitives/combos/two_location.dart';
import 'package:vid/us/vid_us_unit.dart';

import 'calculator.dart';
import 'formulas/general.dart';

class PulsatilityIndexCal extends Calculator<TwoLocation, double> {
  PulsatilityIndexCal(super.ref);

  static const pulsatilityIndexKey = "PI(TCD)";

  @override
  void calculate() {
    if (ref.feature == null) return;

    final feature = ref.feature!;

    feature.values.clear();

    updateStringValue('');

    double pi = double.nan;
    double ps = double.nan;
    double ed = double.nan;
    double vMean = double.nan;

    final child1Feature = findChildFeature(ref.child1);
    final child2Feature = findChildFeature(ref.child2);
    if (child1Feature != null && child2Feature != null) {
      ps = pickChildFloatValue(ref.child1) ?? double.nan;
      ed = pickChildFloatValue(ref.child2) ?? double.nan;

      ps = roundDouble(ps);
      ed = roundDouble(ed);

      vMean = GeneralFormulas.medianVelocity(ps, ed);
      pi = GeneralFormulas.pi(ps, ed, vMean);
    }

    // 按照测试要求不显示数值
    // if (!pi.isNaN) {
    //   updateFloatValue(pi);
    // }

    for (var output in ref.meta.outputs) {
      if (output.name == pulsatilityIndexKey) {
        if (!pi.isNaN) {
          feature.updateFloatValue(output, roundDouble(pi), VidUsUnit.None);
        }
      } else if (output.name == MeasureTerms.VelocityMean) {
        if (!vMean.isNaN) {
          feature.updateFloatValue(output, roundDouble(vMean), VidUsUnit.cms);
        }
      }
    }
  }
}