Generate Payment Options

readme.md

Generate Payment Options

Created with <3 with dartpad.dev.

main.dart

List<int> generatePaymentOptions(int grandTotal, bool isPiutang) {
  final options = <int>[];
  options.add(grandTotal);

  //for piutang, the options would be less than grand total
  if (isPiutang) {
    [0.75, 0.50, 0.25].forEach((divider) {
      final option = (grandTotal * divider).round();
      if (option <= 0) {
        return;
      }

      if (option % 10000 > 0) {
        final newOption = option - option %10000 +
            (option % 10000 < 5000 ? 5000 : 10000);
        if (!options.contains(newOption)) {
          options.add(newOption);
        }
      }

      options.add(option);
    });
  } else {
    if (grandTotal % 10000 > 5000) {
      options.add(grandTotal - grandTotal % 10000 + 10000);
    } else if (grandTotal % 5000 < 5000) {
      options.add(grandTotal - grandTotal % 5000 + 5000);
    }

    [10000, 20000, 50000, 100000].forEach((amt) {
      if (amt > options.last % 100000) {
        options.add(amt + options.last - options.last % 100000);
      }
    });
  }
  return options;
}

void main() {
  final grandTotal = 43000;
  print('Grand Total ${grandTotal}, payment options:');
  print(generatePaymentOptions(grandTotal, false));
}