package jp.gr.java_conf.skrb.util.photoframe;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseMotionAdapter;
import java.io.File;
import java.io.IOException;
import java.text.DateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.prefs.Preferences;
import java.util.prefs.BackingStoreException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JSlider;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import jp.gr.java_conf.skrb.gui.swing.transframe.JTransFrame;

public class PhotoFrame {
    private Preferences prefs;
    private final static String LOCATION_X = "x";
    private final static String LOCATION_Y = "y";
    private final static String ALPHA = "alpha";

    private JFrame frame;
    private JLabel label;
    private JPopupMenu popup;

    private JSlider alphaSlider;
    private JSpinner alphaField;
    private AlphaComposite ac;

    private volatile int locationX;
    private volatile int locationY;

    private volatile double alpha;

    public PhotoFrame(String filename) throws IOException {
        prefs = Preferences.userNodeForPackage(this.getClass());

        frame = new JTransFrame("PhotoFrame");
        frame.setUndecorated(true);
        
        frame.addMouseListener(new MouseAdapter() {
                public void mousePressed(MouseEvent event) {
                    if (event.getButton() == MouseEvent.BUTTON1) {
                        Point p = frame.getLocationOnScreen();
                        locationX = p.x - event.getX();
                        locationY = p.y - event.getY();

                        frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
                    }
                }

                public void mouseReleased(MouseEvent event) {
                    if (event.isPopupTrigger()) {
                        showPopupMenu(event.getComponent(), event.getX(), event.getY());
                    } else {
                        int x = locationX + event.getX();
                        int y = locationY + event.getY();

                        prefs.putInt(LOCATION_X, x);
                        prefs.putInt(LOCATION_Y, y);
                        try {
                            prefs.flush();
                        } catch (BackingStoreException ex) {
                            ex.printStackTrace();
                        }

                        frame.setLocation(x, y);
                        frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
                    }
                }
            });

        alpha = prefs.getDouble(ALPHA, 1.0);
	ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float)alpha);

        ImageComponent icomp = new ImageComponent(filename);
        popup = initPopupMenu();

        frame.getContentPane().add(icomp);

        int x = prefs.getInt(LOCATION_X, 0);
        int y = prefs.getInt(LOCATION_Y, 0);
        frame.setLocation(x, y);

        frame.pack();
        frame.setVisible(true);
    }

    private JPopupMenu initPopupMenu() {
        JPopupMenu menu = new JPopupMenu();
        JMenuItem item = new JMenuItem("アルファの設定...");
        item.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent event) {
                    changeAlpha();
                }
            });
        menu.add(item);

        item = new JMenuItem("終了");
        item.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent event) {
                    System.exit(0);
                }
            });
        menu.add(item);

        return menu;
    }

    private void changeAlpha() {
        JPanel panel = new JPanel();
        JLabel l = new JLabel("Alpha");
        panel.add(l);

        alphaSlider = new JSlider(JSlider.HORIZONTAL, 0, 255, (int)(alpha*255.0));
        alphaSlider.setMajorTickSpacing( 85 );
        alphaSlider.setMinorTickSpacing( 17 );
        alphaSlider.setPaintTicks( true );
        alphaSlider.setPaintLabels( true );
        alphaSlider.addChangeListener(new ChangeListener() {
                public void stateChanged( ChangeEvent e ) {
                    alpha = alphaSlider.getValue()/255.0 ;
                    alphaField.setValue(new Integer(alphaSlider.getValue()));

		    setAlpha(alpha);

                    frame.repaint();
                }
            });
        l.setLabelFor(alphaSlider);
        panel.add(alphaSlider);

        alphaField = new JSpinner(
            new SpinnerNumberModel((int)(alpha*255.0), 0, 255, 1));
        JPanel alphaFieldHolder = new JPanel(new FlowLayout());
        alphaField.addChangeListener(new ChangeListener() {
                public void stateChanged( ChangeEvent e ) {
                    alpha = ((Integer)alphaField.getValue()).intValue()/255.0;
                    alphaSlider.setValue(((Integer)alphaField.getValue()).intValue());
                    
		    setAlpha(alpha);

                    frame.repaint();
                }
            });
        alphaFieldHolder.add(alphaField);
        panel.add(alphaFieldHolder);
        
        JOptionPane.showMessageDialog(frame, panel,
                                      "アルファの設定", JOptionPane.PLAIN_MESSAGE, null);
    }

    private void setAlpha(double alpha) {
	this.alpha = alpha;
	ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float)alpha);
	prefs.putDouble(ALPHA, alpha);
    }

    private void showPopupMenu(Component comp, int x, int y) {
        popup.show(comp, x, y);
    }

    class ImageComponent extends JComponent {
        private Image image;

        public ImageComponent(String filename) throws IOException {
            image = ImageIO.read(new File(filename));
        }
        
        public Dimension getPreferredSize() {
            return new Dimension(image.getWidth(this), image.getHeight(this));
        }

        public void paintComponent(Graphics g) {
            Graphics2D g2d = (Graphics2D)g;
            
            g2d.setComposite(ac);
            g2d.drawImage(image, 0, 0, this);
        }
    }

    public static void main(String[] args) {
        if (args.length < 1) {
            System.out.println("java PhotoFrame [filename or URL]");
            return;
        }

        try {
            new PhotoFrame(args[0]);
        } catch (IOException ex) {
            System.out.println("ファイルが存在しません");
        }
    }
}