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

/**
 * Canvas of BMP file viewer
 * <p>
 * @author      Hiroyuki Murata
 * @since       JDK1.1
 */
class BmpCanvas extends Canvas implements ComponentListener {
    Frame frame;
    File file;
    BmpReader reader;
    int[] pix;
    Image img;
    int wid=200, hei=200;

    boolean isActive() { return file != null; }
    private boolean isbmp;
    boolean isBmp() { return isbmp; }

    BmpCanvas(Frame frame, File file) {
        this.frame = frame;
        this.file = file;
        setForeground(Color.red);
        addComponentListener(this);

        if (isActive()) {
            String lowfile = file.getName().toLowerCase();
            isbmp = lowfile.endsWith(".bmp");
            if (isbmp) {
                try {
                    reader = new BmpReader(file);
                    reader.read();
                    //System.out.println(reader.toString());
                    pix = reader.getPix();
                    wid = reader.getWidth();
                    hei = reader.getHeight();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else if (!(
                lowfile.endsWith(".gif") ||
                lowfile.endsWith(".jpg") ||
                lowfile.endsWith(".jpeg")
            )) {
                this.file = null;
            }
        }
    }

    void view() {
        if (isActive()) {
            if (isBmp()) {
                img = createImage( new MemoryImageSource(
                    wid,hei, pix, 0,wid
                ));
            } else {
                try {
                    img = Toolkit.getDefaultToolkit().getImage(
                        file.getCanonicalPath()
                    );
                } catch (IOException e) {
                    this.file = null;
                    return;
                }
            }

            MediaTracker mt = new MediaTracker(this);
            mt.addImage(img,0);
            try {
                mt.waitForAll();
            } catch (InterruptedException e) {
            }
            if (!isBmp()) {
                wid = img.getWidth(this);
                hei = img.getHeight(this);
            }
        }
    }

    String getReaderInfo() {
        if (isbmp)  return reader.toString();
        else        return "";
    }

    boolean saveBMP(File fileSave) {
        pix = new int[wid * hei];
        PixelGrabber pg = new PixelGrabber(
            img, 0, 0, wid, hei, pix, 0, wid
        );

        boolean complete = false;

        try {
            complete = pg.grabPixels();
        } catch (InterruptedException e) {
        }

        try {
            BmpWriter writer = new BmpWriter(fileSave, pix, wid, hei);
            writer.write();
        } catch (IOException e) {
            complete = false;
        }

        return complete;
    }

    public void update(Graphics g) {
        paint(g);
    }
    public void paint(Graphics g) {
        if (img == null) {
            g.drawString("null", 20,20);
        } else {
            g.drawImage(img,0,0,this);
        }
    }

    public Dimension getPreferredSize() {
        return new Dimension(wid,hei);
    }

    // as ComponentListener --------------------------------
    public void componentShown(ComponentEvent ev) {
        frame.pack();
    }
    public void componentResized(ComponentEvent ev) {}
    public void componentMoved(ComponentEvent ev) {}
    public void componentHidden(ComponentEvent ev) {}

    //------------------------------------------------------
    protected void finalize() throws Throwable {
        if (img != null)
            img.flush();
        super.finalize();
    }
}
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