import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.applet.Applet;
//<APPLET code = shopping21.class width=400 height=250> </APPLET>

public class shopping21 extends Applet implements ActionListener {

      private Choice food = new Choice();
      private Choice number = new Choice();
      private Button AddItem =new Button("Add");
      private Button Show = new Button ("show cost");
      private double [] price ={0.35, 1.00, 0.50, 1.15, 2.50, 0.50, 1.30, 0.75, 0.65, 1.00};
      private static DecimalFormat twoDP = new DecimalFormat("0.00");
      private double bill=0;
 	private List list;
 	private String[] s;

  public void init () {
 add(food);
    food.addItem("Select Item");
 food.addItem("Beans");
    food.addItem("cornflakes");
    food.addItem("sugar");
    food.addItem("Tea bag");
    food.addItem("coffee");
    food.addItem("Bread");
    food.addItem("Sausage");
    food.addItem("Eggs");
    food.addItem("Milk");
    food.addItem("Potatoes");


    add(number);
  number.addItem("----");
  number.addItem("1");
        number.addItem("2");
        number.addItem("3");
        number.addItem("4");
        number.addItem("5");
        number.addItem("6");
        number.addItem("7");
        number.addItem("8");
        number.addItem("9");
        number.addItem("10");
  number.addItem("11");
        number.addItem("12");
        number.addItem("13");
        number.addItem("14");
        number.addItem("15");
        number.addItem("16");
        number.addItem("17");
        number.addItem("18");
        number.addItem("19");
        number.addItem("20");
    
 add(Show);

      Show.addActionListener(this);
    add(AddItem);
      AddItem.addActionListener(this);

 	list= new List (10,true);   //i am trying to list the product selected by customer, but didn't work
    list.add("Beans");
  list.add("cornflakes");
  list.add("sugar");
  list.add("Tea bag");
  list.add("coffee");
  list.add("Bread");
  list.add("Sausage");
  list.add("Eggs");
  list.add("Milk");
  list.add("Potatoes");
 	add(list);
 	list.addActionListener(this);
 	s = list.getSelectedItems();	
  }

 /**
  * calculates the total of the sale from the lineItem subtotals
  * @return total of the sale
  */
 public double calcPayments() {
  paymentsTotal = 0.0;
  Iterator i = payments.iterator();
  while (i.hasNext()) paymentsTotal += ((Payment)i.next()).getAmount();
  return total;
 }

/**
  * calculates the total of the sale from the lineItem subtotals
  * @return total of the sale
  */
 public double calcTotal() {
  total = 0.0;
  Iterator i = lineItems.iterator();
  while (i.hasNext()) total += ((LineItem)i.next()).calcTotal();
  return total;
 }

/**
  * retrieves the cached total of the sale
  * @return total of sale, 0.0 if calcTotal() has not yet been called
  */
 public double getTotal() {
  return total;
 }

 /**
  * sets the status of the sale to compltete if payments equal price
  * @exception Exce[tion thrown if payments do not equal price
  */
 public void complete() throws Exception {
  if (calcTotal() != calcPayments()) {
   throw new Exception("Payments do not equal total price");
  }
  status = "Complete";
 }
 /** status of sale */
 private String status = "Incomplete";

 /**
  * adds a line item for a quantity of a type of item
  * @param product the type of item being sold
  * @param qty the quantity of the item being sold
  */
 public void addLineItem(Product product, int qty) throws Exception {
  if (status.equals("Incomplete")) {
   lineItems.add(new LineItem(product, qty));
  }
  else {
   throw new Exception("Cannot add items to a completed sale");
  }
 }
//CashPayment Class
/**
 * a subclass that extends the Payment class to represent cash payments
 * @stereotype moment-interval
 */
public class CashPayment extends Payment {
 /**
  * mandatory value constructor requires values for all attributes needed to
  * put the new object into a valid state
  *
  * @param amount the amount tendered for this payment
  */
 public CashPayment(double amount) {
  super(amount);
 }

	/**
  * amount tendered is what was passed into the constructor
  * @return amount tendered
  */
 public double getAmountTendered() {
  return super.getAmount();
 }

 /**
  * calculate the change to be given for a required amount
  * @return value of change
  */
 public double calcChange( double requiredAmount ) {
  change = super.getAmount() - requiredAmount;
  return change;
 }

 /**
  * override superclass to calc actual amount based on change given
  * @return amountTendered - change given
  */
	public double getAmount() {
  return super.getAmount() - change;
 }

	/** amopunt of change given */
 private double change = 0.0;









	//Might not necessary be part of code 

  /** public void actionPerformed (ActionEvent e) {
 s = list.getSelectedItems();
 repaint();
 if (e.getSource()== AddItem)
 	{
 int index = food.getSelectedIndex();
    int num = number.getSelectedIndex()+1;
 bill +=price[index]*num;
 }
 else
 	{
    JOptionPane.showMessageDialog(this, "please pay this amount £" + twoDP.format(bill));
 JOptionPane.showMessageDialog(this, "thank you for shopping and visit us again");
 JOptionPane.showMessageDialog(this, "I am ");
	
 	}
	
 public void paint (Graphics g) {
 	for ((int i=0; i< s.lenght;i++){
  g.drawSting(s(i),50, 150, 100+20*i);"
 	}*/
 	
 }
 }

}