/**************************************************************
 *Class for the purchase of one kind of item, such as 3 oranges.
 *Prices are set supermarket style, such as 5 for $1.25.
 **************************************************************/
public class PurchaseVersion2
{
    private String name;
    private int groupCount;//Part of price, like the 2 in 2 for $1.99.
    private double groupPrice;
                      //Part of price, like the $1.99 in 2 for $1.99.
    private int numberBought;//Total number being purchased.
    private double priceForOne;

    public void setName(String newName)
    {
        name = newName;
    }

    /*********************************************************************
     *Sets price to groupCount pieces for $costForCount. E.g., 2 for $1.99.
     *********************************************************************/
    public void setPrice(int numberInGroup, double costForNumber)
    {
        if ((numberInGroup <= 0) || (costForNumber <= 0))
        {
            System.out.println("Error: Bad parameter in setPrice.");
            System.exit(0);
        }
        else
        {
            groupCount = numberInGroup;
            groupPrice = costForNumber;
            priceForOne = groupPrice/groupCount;
        }
    }

    public void setNumberBought(int number)
    {
        if (number <= 0)
        {
            System.out.println("Error: Bad parameter in setNumberBought.");
            System.exit(0);
        }
        else
            numberBought = number;
    }

    /****************************************************
     *Gets price and number being purchased from keyboard.
     *Does not check with user to see that the data is OK.
     ****************************************************/

    private void inputData()
    {
        System.out.println("Enter name of item you are purchasing:");
        name = SavitchIn.readLine();
        System.out.println("Enter price of item on two lines.");
        System.out.println("For example, 3 for $2.99 is entered as");
        System.out.println("3");
        System.out.println("2.99");
        System.out.println("Enter price of item on two lines, now:");
        groupCount = SavitchIn.readLineInt();
        groupPrice = SavitchIn.readLineDouble();

        while ((groupCount <= 0) || (groupPrice <= 0))
        {//Try again:
            System.out.println(
                        "Both numbers must be positive. Try again.");
            System.out.println("Enter price of item on two lines.");
            System.out.println(
                            "For example, 3 for $2.99 is entered as");
            System.out.println("3");
            System.out.println("2.99");
            System.out.println(
                            "Enter price of item on two lines, now:");
            groupCount = SavitchIn.readLineInt();
            groupPrice = SavitchIn.readLineDouble();
        }

        priceForOne = groupPrice/groupCount;

        System.out.println("Enter number of items purchased:");
        numberBought = SavitchIn.readLineInt();

        while (numberBought <= 0)
        {//Try again:
           System.out.println(
                             "Number must be positive. Try again.");
            System.out.println("Enter number of items purchased:");
            numberBought = SavitchIn.readLineInt();
        }
    }
    /****************************************************
     *Gets price and number being purchased from keyboard.
     ****************************************************/
    public void readInput()
    {
        inputData();
        writeOutput();
        System.out.println("Is that correct?(y/n)");
        char ans = SavitchIn.readLineNonwhiteChar();
        while ((ans != 'y') && (ans != 'Y'))
        {//Try again:
            inputData();
            writeOutput();
            System.out.println("Is that correct?(y/n)");
            ans = SavitchIn.readLineNonwhiteChar();
        }
    }

    /***************************************************
     *Outputs price and number being purchased to screen.
     ***************************************************/
    public void writeOutput()
    {
        System.out.println(numberBought + " " + name);
        System.out.println("at " + groupCount
                                    + " for $" + groupPrice);
    }

    public String getName()
    {
        return name;
    }

    public double getTotalCost()
    {
        return (priceForOne*numberBought);
    }

    public double getUnitCost()
    {
        return priceForOne;
    }

    public int getNumberBought()
    {
        return numberBought;
    }
}