// Stuart Reges
// 1/19/00
//
// Class ShoppingFrame provides the user interface for a simple shopping
// program.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;

public class ShoppingFrame extends JFrame {
    private final ShoppingCart myItems;
    private final JTextField myTotal;

    public ShoppingFrame(Catalog products)      {
        // create frame and order list
        setTitle(products.getName());
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container contentPane = getContentPane();
        myItems = new ShoppingCart();

        // set up text field with order total
        myTotal = new JTextField("$0.00", 12);
        myTotal.setEditable(false);
        myTotal.setEnabled(false);
        myTotal.setDisabledTextColor(Color.black);
        JPanel p = new JPanel();
        p.setBackground(Color.blue);
        JLabel l = new JLabel("order total");
        l.setForeground(Color.yellow);
        p.add(l);
        p.add(myTotal);
        contentPane.add(p, "North");

        p = new JPanel(new GridLayout(products.length(), 1));
        for (int i = 0; i < products.length(); i++)
            addItem(products.get(i), p);
        contentPane.add(p, "Center");

        p = new JPanel();
        contentPane.add(makeCheckBoxPanel(), "South");

        // adjust size to just fit
        pack();
    }

    private JPanel makeCheckBoxPanel() {
        JPanel p = new JPanel();
        p.setBackground(Color.blue);
        final JCheckBox cb = new JCheckBox("qualify for discount");
        p.add(cb);
        cb.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                myItems.setDiscount(cb.isSelected());
                updateTotal();
            }
        });
        return p;
    }


    private void addItem(final Item product, JPanel p) {
        JPanel sub = new JPanel(new FlowLayout(FlowLayout.LEFT));
        sub.setBackground(new Color(0, 180, 0));
        final JTextField quantity = new JTextField(3);
        quantity.setHorizontalAlignment(SwingConstants.CENTER);
        quantity.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                updateItem(product, quantity);
                quantity.transferFocus();
            }
        });
        quantity.addFocusListener(new FocusAdapter() {
            public void focusLost(FocusEvent e) {
                updateItem(product, quantity);
            }
        });
        sub.add(quantity);
        JLabel l = new JLabel("" + product);
        l.setForeground(Color.white);
        sub.add(l);
        p.add(sub);
    }

    private void updateItem(Item product, JTextField quantity)
    {
        int number;
        String text = quantity.getText().trim();
        try {
            number = Integer.parseInt(text);
        } catch (NumberFormatException error) {
            number = 0;
        }
        myItems.add(new ItemOrder(product, number));
        updateTotal();
    }

    private void updateTotal() {
        double total = myItems.getTotal();
        myTotal.setText(NumberFormat.getCurrencyInstance().format(total));
    }

}