fetchProductVariant function

DeliveryDoseCriteria? fetchProductVariant(ProjectCycleDelivery? currentDelivery, IndividualModel? individualModel, HouseholdModel? householdModel)

Implementation

DeliveryDoseCriteria? fetchProductVariant(ProjectCycleDelivery? currentDelivery,
    IndividualModel? individualModel, HouseholdModel? householdModel) {
  if (currentDelivery != null) {
    var individualAgeInMonths = 0;
    var gender;
    var roomCount;
    var memberCount;

    if (individualModel != null) {
      final individualAge = DigitDateUtils.calculateAge(
        DigitDateUtils.getFormattedDateToDateTime(
              individualModel.dateOfBirth!,
            ) ??
            DateTime.now(),
      );
      individualAgeInMonths = individualAge.years * 12 + individualAge.months;

      gender = individualModel.gender?.index;
    }
    if (householdModel != null && householdModel.additionalFields != null) {
      memberCount = householdModel.memberCount;
      roomCount = int.tryParse(householdModel.additionalFields?.fields
              .where((h) => h.key == AdditionalFieldsType.noOfRooms.toValue())
              .firstOrNull
              ?.value
              .toString() ??
          '1')!;
    }

    final filteredCriteria = currentDelivery.doseCriteria?.where((criteria) {
      final condition = criteria.condition;
      if (condition != null) {
        final conditions = condition.split('and');

        List expressionParser = [];
        for (var element in conditions) {
          final expression = FormulaParser(
            element,
            {
              'age': individualAgeInMonths,
              if (gender != null) 'gender': gender,
              if (memberCount != null) 'memberCount': memberCount,
              if (roomCount != null) 'roomCount': roomCount
            },
          );
          final error = expression.parse;
          expressionParser.add(error["value"]);
        }

        return expressionParser.where((element) => element == true).length ==
            conditions.length;
      }

      return false;
    }).toList();

    return (filteredCriteria ?? []).isNotEmpty ? filteredCriteria?.first : null;
  }

  return null;
}