package guiexample;

import java.awt.*; // older GUI library, has layout stuff for components
import java.awt.event.*; // events
import javax.swing.*; // swing is a library of GUI components

// example GUI 
// class extends JFrame, so it is its own window
public class BunnyGUI extends JFrame {

    // the bunny
    private Bunny mrBun;
    // input
    private JTextField namebox;
    private JTextField carrotbox;
    private JButton feedbutton;
    // output
    private JLabel display;

    // constructor does all setup of window and buttons
    public BunnyGUI() {
        // set up the window
        super("Your pet bunny");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new FlowLayout());

        mrBun = new Bunny();
        mrBun.setMyUI(this);

        // output text box
        display = new JLabel();
        // call our own method for updating the display
        updateDisplayBox();

        setupNameBox();
        setupCarrotBox();
        setupFeedButton();

        // put the widgets in the window
        add(new JLabel("Enter values to reset Bunny's data"));
        add(namebox);
        add(carrotbox);
        add(display);
        add(feedbutton);

        // make the window visible
        pack();
        setVisible(true);
    }

    // setup box for entering name
    public void setupNameBox() {
        // input text box for name
        namebox = new JTextField(10);
        namebox.setText("Bunny Name");
        // on enter, change the name of the bunny to the value given
        namebox.addActionListener(
                new ActionListener() {

                    public void actionPerformed(ActionEvent e) {
                        mrBun.setName(namebox.getText());
                        updateDisplayBox();
                    }
                }
        );

    }

    // setup the box for entering number of carrots
    public void setupCarrotBox() {
                // input text box for carrots
        carrotbox = new JTextField(10);
        carrotbox.setText("Carrots");
        // on enter, change the name of the bunny to the value given
        carrotbox.addActionListener(
                new ActionListener() {

                    public void actionPerformed(ActionEvent e) {
                        try {
                            // carrotbox contains a string, so need to parse as int
                            mrBun.setCarrotCount(Integer.parseInt(carrotbox.getText()));
                            updateDisplayBox();
                        } catch (Exception ex) {
                            // nasty message on bad input
                            JOptionPane.showMessageDialog(
                                    BunnyGUI.this, // parent window to center over
                                    // just this would be the actionlistener, BunnyGUI.this gets us the outer class
                                    "enter a whole number", // output to show
                                    "Bad Input", // message box title
                                    JOptionPane.ERROR_MESSAGE);	// message box style
                        }
                    }
                }
        );
    }

    // set up button for feeding Bunny
    public void setupFeedButton() {
        // button to feed the bunny
        feedbutton = new JButton("feed the bunny");
        // on button click, feed the bunny some carrots
        feedbutton.addActionListener(
                new ActionListener() {

                    public void actionPerformed(ActionEvent e) {
                        // this also causes output by the bunny...
                        mrBun.feed((int) (Math.random() * 5) + 1);
                        updateDisplayBox();
                    }
                }
        );
    }

    // need to update display in several places, so stick it in its own method
    public void updateDisplayBox() {
        display.setText(mrBun.getName() + " ate "
                + mrBun.getCarrotCount() + " carrots total.");
    }

    // send message from the bunny to the user
    public void messageToUser(String msg) {
        JOptionPane.showMessageDialog(null, msg, "Bunny Message", JOptionPane.INFORMATION_MESSAGE);
    }

    // main to launch the GUI
    public static void main(String[] args) {
        BunnyGUI gui = new BunnyGUI();
    }
}