fis_lib_measure/lib/process/unit/convert/abstract.dart

import 'package:fis_measure/utils/number.dart';
import 'package:vid/us/vid_us_unit.dart';

abstract class UnitMapBase {
  Map<VidUsUnit, double>? _map;
  final VidUsUnit unit;

  UnitMapBase(this.unit) {
    initMap();
  }

  Map<VidUsUnit, double> get map {
    _map ??= <VidUsUnit, double>{};
    return _map!;
  }

  void initMap();

  void add(VidUsUnit target, double scale) {
    map[target] = scale;
  }

  double convert(VidUsUnit target, double value) {
    if (target == unit) return value;

    if (map.containsKey(target)) {
      final scale = map[target]!;
      final result = NumUtil.roundDouble(value / scale, 2);
      return result;
    }
    return value;
  }
}