import java.io.*;
//=================================================================================================
public class FileCarDealer {
//-------------------------------------------------------------------------------------------------
//----These can be static and every object will know
    private static final int MAX_CARS = 10;
    private static final double MARK_UP = 0.3;

    private String name;
    private FileCar[] carsOnLot;
//-------------------------------------------------------------------------------------------------
    public FileCarDealer() {

        int index;

        name = null;
        carsOnLot = new FileCar[MAX_CARS];
    }
//-------------------------------------------------------------------------------------------------
    public FileCarDealer(String newName) {

        this();
        name = newName;
    }
//-------------------------------------------------------------------------------------------------
    public void display() {

        int index;

        System.out.println(name);
        for (index = 0; index < carsOnLot.length; index++) {
            if (carsOnLot[index] != null) {
                System.out.print("   "+ (index+1) + ": ");
                System.out.println(carsOnLot[index]);
            }
        }
    }
//-------------------------------------------------------------------------------------------------
    public void buyCar(String makeAndModel,double price) {

        int index;

        index = 0;
        while (carsOnLot[index] != null) {
            index++;
        }
        if (index < carsOnLot.length) {
            carsOnLot[index] = new FileCar(makeAndModel,price,
            price * (1.0 + MARK_UP));
        } else {
            System.out.println("ERROR: No more space on the lot");
        }
    }
//-------------------------------------------------------------------------------------------------
    public double sellCar(int carIndex,double actualSalePrice) {

        FileCar soldCar;

        carIndex--;
        if (carsOnLot[carIndex] == null) {
            System.out.println("ERROR: No car there");
            return(0.0);
        } else {
            soldCar = carsOnLot[carIndex];
            carsOnLot[carIndex] = null;
            return(actualSalePrice - soldCar.getPurchasePrice());
        }
    }
//-------------------------------------------------------------------------------------------------
    public static boolean saveCarFile(String fileName,FileCarDealer dealer) {

        ObjectOutputStream toStream = null;
        int carNumber;

        try {
            toStream = new ObjectOutputStream(new FileOutputStream(fileName));
            for (carNumber = 0; carNumber < dealer.carsOnLot.length; carNumber++) {
                if (dealer.carsOnLot[carNumber] != null) {
                    toStream.writeObject(dealer.carsOnLot[carNumber]);
                }
            }
            return(true);
        } catch (IOException e) {
            System.out.println("ERROR: Saving cars: " + e.getMessage());
            return(false);
        } finally {
            if (toStream != null) {
                try {
                    toStream.close();
                } catch (IOException e) {
                    System.out.println(e.getMessage());
                    return(false);
                }
            }
        }
    }
    //-------------------------------------------------------------------------------------------------
    public static boolean loadCarFile(String fileName,FileCarDealer dealer) {

        ObjectInputStream fromStream = null;
        FileCar nextCar;
        int numberOfCars;

        numberOfCars = 0;
        try {
            fromStream = new ObjectInputStream(new FileInputStream(fileName));
            nextCar = (FileCar)fromStream.readObject();
            while (nextCar != null) {
                dealer.carsOnLot[numberOfCars] = nextCar;
                numberOfCars++;
                nextCar = (FileCar)fromStream.readObject();
            }
            return(true);
        } catch (EOFException e) {
//----Ignore it - we came to end of file. That's cool.
            return(true);
        } catch (IOException e) {
            System.out.println("ERROR: Loading cars: " + e.getMessage());
            return(false);
        } catch (ClassNotFoundException e) {
            System.out.println(e.getMessage());
            return(false);
        } finally {
            System.out.println(numberOfCars + " cars read from " + fileName);
            if (fromStream != null) {
                try {
                    fromStream.close();
                } catch (IOException e) {
                    System.out.println("ERROR: Closing file: " + e.getMessage());
                    return(false);
                }
            }
        }
    }
//-------------------------------------------------------------------------------------------------
}
//=================================================================================================