package bmpviewer;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

/**
 * BMP file viewer
 * <p>
 * @author      Hiroyuki Murata
 * @since       JDK1.1
 */
class BmpViewer extends Frame implements WindowListener {
    BmpCanvas canvas;
    FileDialog diaLoad;
    TextInputDialog diaSave;
    Button
        btnLoad = new Button("Load"),
        btnSave = new Button("Save"),
        btnInfo = new Button("Info")
    ;
    String strCurrentDir;

    BmpViewer(String filename) {
        setupBasic();
        setupDialog();
        //setupMenu(); // buggy!
        setupButton();
        setupCanvas(filename);
        pack();
        show();
    }

    // - - - - - - - - - - - - - - - - - - - - - - - - - - -
    private void setupBasic() {
        setBackground(Color.white);
        addWindowListener(this);
    }

    private void setupDialog() {
        diaLoad = new FileDialog(this, "select BMP|GIF|JPG file");
        diaLoad.setFilenameFilter( new FilenameFilter() {
            public boolean accept(File dir, String name) {
                String lowname = name.toLowerCase();
                return
                    lowname.endsWith(".bmp") ||
                    lowname.endsWith(".gif") ||
                    lowname.endsWith(".jpg") ||
                    lowname.endsWith(".jpeg")
                ;
            }
        });
        strCurrentDir = diaLoad.getDirectory();

        diaSave = new TextInputDialog(
            this, "TextInputDialog", "save BMP file as:", 20
        );
    }

    private void setupButton() {
        Panel pBtns = new Panel();
        add("South",pBtns);

        pBtns.add(btnLoad);
        btnLoad.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                diaLoad.show();
                String strDir  = diaLoad.getDirectory();
                String strFile = diaLoad.getFile();
                if (strDir == null || strFile == null)
                    return;
                File file = new File(strDir, strFile);
                strCurrentDir = strDir;

                remove(canvas);
                canvas = new BmpCanvas(BmpViewer.this, file);
                add("Center",canvas);
                canvas.view();

                setTitle(strFile);
                btnSave.setEnabled(true);
                btnInfo.setEnabled(canvas.isBmp());
                pack();
            }
        });

        pBtns.add(btnSave);
        btnSave.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                diaSave.setVisible(true);
            }
        });
        //
        diaSave.addEnter( new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                String filename = diaSave.getText();
                String lowName = filename.toLowerCase();
                if (!lowName.endsWith(".bmp"))
                    filename += filename.equals(lowName) ? ".bmp" : ".BMP";
                File savepath = new File(strCurrentDir, filename);

                if (savepath.exists()) {
                    MessageDialog md = new MessageDialog(
                        BmpViewer.this, "warning",
                        "File \"" + filename + "\":\n already exists."
                    );
                } else {
                    boolean complete = canvas.saveBMP(savepath);
                    if (!complete) {
                        MessageDialog md = new MessageDialog(
                            BmpViewer.this, "warning",
                            "File \"" + filename + "\":\n save failed."
                        );
                    }
                }
                diaSave.setVisible(false);
            }
        });

        pBtns.add(btnInfo);
        btnInfo.setEnabled(false);
        btnInfo.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                MessageDialog md = new MessageDialog(
                    BmpViewer.this, "BMP header",
                    canvas.getReaderInfo()
                );
            }
        });
    }

    private void setupCanvas(String filename) {
        File file;
        if (filename == null) {
            file = null;
            btnSave.setEnabled(false);
        } else {
            file = new File(System.getProperty("user.dir"), filename);
        }
        canvas = new BmpCanvas(this, file);
        add("Center",canvas);
        canvas.view();
    }

    //------------------------------------------------------
    public static void main(String[] args) {
        if (args.length == 0) {
            new BmpViewer(null);
        } else {
            new BmpViewer(args[0]);
        }
    }

    // as WindowListener -----------------------------------
    public void windowClosing(WindowEvent ev) { System.exit(0); }
    public void windowOpened(WindowEvent ev) {}
    public void windowClosed(WindowEvent ev) {}
    public void windowIconified(WindowEvent ev) {}
    public void windowDeiconified(WindowEvent ev) {}
    public void windowActivated(WindowEvent ev) {}
    public void windowDeactivated(WindowEvent ev) {}
}