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

public class GetAtlanticImages implements ActionListener {
    private JFrame frame = new JFrame();
    public static final int NBRIMAGES = 12;
    private Image[] images = new Image[NBRIMAGES];
    private Timer timer = new Timer(1000, this);
    int imageIndex = 0;
    ImageViewer image = new ImageViewer(); // JPanel displays images on frame
    SatelliteDate imageTime;

    public GetAtlanticImages() {
        imageTime = new SatelliteDate();
        start();
    }

    public void start() {
        frame.setSize(800, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        imageIndex = 0;
        frame.setVisible(true);
        fillArray();
        addControlPanel();
        image.setImage(images[imageIndex]);
        frame.add(image, BorderLayout.CENTER);
        frame.setVisible(true);
        timer.start();
    }

    public void addControlPanel()
    {
                JPanel controlPanel = new JPanel();
        JButton again = new JButton("Again");
        controlPanel.add(again);
        again.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt)
                {
                    timer.stop();
                    imageIndex = 0;
                    image.setImage(images[imageIndex]);
                    timer.start();
                }
            });
        frame.add(controlPanel, BorderLayout.SOUTH);
    }

    public void actionPerformed(ActionEvent e) {
        image.setImage(images[++imageIndex]);
        // stop the time at the last index
        if (imageIndex == NBRIMAGES - 1)
            timer.stop();
    }
        
    public void fillArray()
    {
        JLabel message = new JLabel("... Looking up URLS ...");
        frame.add(message, BorderLayout.CENTER);
        for (int i=0;i<12;i++)
        {
            String datePart = imageTime.toString();
            String urlName = getURL(datePart);
            images[i] = ImageViewer.createImage(urlName);
            message.setText(" ... Loading File " + (i+1)
                            + " from URL  " + urlName + " ... ");
            imageTime.addHours(2);
        }
        frame.remove(message);
    }
        
        
    /** gets URLs and stores them in images
     * assumes that f has a border layout */
    private String getURL (String datePart)  {
        return "http://www.goes-arch.noaa.gov/HUIR" +  datePart + "45.GIF";
    }

    public static void main(String[] args) {
        new GetAtlanticImages();
    }
}