FetchLoanDetailUseCase.dart

class LoanParamRequest {
  final double amount, time;

  LoanParamRequest(this.amount, this.time);
}

class LoanDetailResponse {
    String? _emi;
}

class LoanDetailDTO {
  final double _rate;

  LoanDetailDTO(this._rate);
}

abstract class ILoanRepository
{
  Future<LoanDetailDTO> getLoanFromServer(String amount,String time);
}

class UseCaseNotImplementedException implements Exception {}

class FetchLoanDetail extends UseCase<LoanParamRequest, LoanDetailResponse> {
  final ILoanRepository _loanRepository;

  FetchLoanDetail(this._loanRepository);

  @override
  Stream<LoanDetailResponse> buildUseCase(LoanParamRequest param) {
    return Stream.error(UseCaseNotImplementedException());
  }
}