package horstmann.ch05_invoice;
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.ChangeListener;

/**
   A program that tests the invoice classes.
 */
public class InvoiceTester
{
	public static void main(String[] args)
	{
		final Invoice invoice = new Invoice();
		final InvoiceFormatter formatter = new SimpleFormatter();

		// This text area will contain the formatted invoice
		final JTextArea textArea = new JTextArea(20, 40);

		// When the invoice changes, update the text area
		ChangeListener listener = event -> textArea.setText(invoice.format(formatter));
		invoice.addChangeListener(listener);

		// Add line items to a combo box
		final JComboBox<LineItem> combo = new JComboBox<>();
		Product hammer = new Product("Hammer", 19.95);
		Product nails = new Product("Assorted nails", 9.95);
		combo.addItem(hammer);
		Bundle bundle = new Bundle();
		bundle.add(hammer);
		bundle.add(nails);
		combo.addItem(new DiscountedItem(bundle, 10));

		// Make a button for adding the currently selected
		// item to the invoice
		JButton addButton = new JButton("Add");
		addButton.addActionListener(event -> {
			LineItem item = (LineItem) combo.getSelectedItem();
			invoice.addItem(item);
		});

		// Put the combo box and the add button into a panel
		JPanel panel = new JPanel();
		panel.add(combo);
		panel.add(addButton);

		// Add the text area and panel to the content pane
		JFrame frame = new JFrame();
		frame.add(new JScrollPane(textArea),
				BorderLayout.CENTER);
		frame.add(panel, BorderLayout.SOUTH);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}
}