public abstract class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string ReportType { get; set; }
    public int Salary { get; set; }

    public virtual string GetProjectDetails(int employeeId)
    {
        return "Base Project";
    }

    public virtual string GetEmployeeDetails(int employeeId)
    {
        return $"Employee: { Name }";
    }

    public abstract bool InsertIntoEmployeeTable(Employee em);

    public void GenerateReport(Employee em)
    {
        if (ReportType == "CSV")
        {
            // Report generation code with employee data saved as CSV file.
        }

        if (ReportType == "PDF")
        {
            // Report generation code with employee data saved as CSV file.
        }
    }
}

public class RegularEmployee : Employee
{
    public override string GetProjectDetails(int employeeId)
    {
        return "Child Project";
    }

    public override string GetEmployeeDetails(int employeeId)
    {
        return "Child Employee";
    }

    public override bool InsertIntoEmployeeTable(Employee em)
    {
        // insert code;
        return true;
    }
}

public class SubcontractorEmployee : Employee
{
    public float ParentCompanyFee { get; set; }

    public override string GetProjectDetails(int employeeId)
    {
        return "Child Project";
    }

    public override string GetEmployeeDetails(int employeeId)
    {
        throw new NotImplementedException();
    }

    public override bool InsertIntoEmployeeTable(Employee em)
    {
        // subcontractors are not stored in the Employee table
        return false;
    }

    public float GetCompanyFee(float netSalary)
    {
        var feeCalculator = new CheatingFeeCalculator();

        float baseFee = feeCalculator.CalculateBaseFee(netSalary, ParentCompanyFee);
        float finalFee = baseFee * 0.95;

        return finalFee;
    }
}