Refactored_motor1.cs

public abstract class Invoice 
{
	protected Motorcycle Motor {get;}
	protected Duration TrackDuration {get;}
	
	public Invoice(Motorcycle motor, Duration duration)
	{
		this.Motor = motor;
		this.TrackDuration = duration;
	}
	
	public abstract Double CalculateInvoice();
	
	public virtual void PayInvoice()
	{
		// bayar tagihan
	}
}

public class RentInvoice : Invoice
{
	public RentInvoice(Motorcycle motor, Duration duration) : base(Motorcycle motor, Duration duration)
	{
	}

	public override Double CalculateInvoice()
	{
		// perhitungan tagihan tracking motor sewaan
	}
	
	public override void PayInvoice()
	{
		// pembayaran struk tracking khusus motor sewaan
	}
}

public class LoanInvoice : Invoice
{
	public LoanInvoice(Motorcycle motor, Duration duration) : base(Motorcycle motor, Duration duration)
	{
	}

	public override Double CalculateInvoice()
	{
		// perhitungan tagihan tracking motor pinjaman
	}
}

public class PersonalInvoice : Invoice
{
	public PersonalInvoice(Motorcycle motor, Duration duration) : base(Motorcycle motor, Duration duration)
	{
	}

	public override Double CalculateInvoice()
	{
		// perhitungan tagihan tracking motor personal
	}
}

public static class InvoiceFactory
{
	public static Invoice Create(Motorcycle motor, Duration duration)
	{
		return motor.type switch {
			"rent" => return new RentInvoice(motor, duration),
			"loan" => return new LoanInvoice(motor, duration),
			"personal" => return new PersonalInvoice(motor, duration),
			_ => throw new Exception("Motorcycle type is invalid!"),
		};
	}
}