package ij.plugin;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.measure.*;
import ij.util.Tools;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

/** This plugin implements the Edit/Scale command. */
public class Scaler implements PlugIn, TextListener, FocusListener {
    private ImagePlus imp;
    private static String xstr = "0.5";
    private static String ystr = "0.5";
    private static int newWidth, newHeight;
    private static boolean newWindow = true;
    private static boolean interpolate = true;
    private static boolean fillWithBackground;
    private static boolean processStack = true;
    private double xscale;
    private double yscale;
    private String title = "Untitled";
    private Vector fields;
    private double bgValue;
    private boolean constainAspectRatio = true;
    private TextField xField, yField, widthField, heightField;
    private Rectangle r;
    private Object fieldWithFocus;

    public void run(String arg) {
        imp = IJ.getImage();
        Roi roi = imp.getRoi();
        if (roi!=null && !roi.isArea())
            imp.killRoi(); // ignore any line selection
        ImageProcessor ip = imp.getProcessor();
        if (!showDialog(ip))
            return;
        if (ip.getWidth()>1 && ip.getHeight()>1)
            ip.setInterpolate(interpolate);
        else
            ip.setInterpolate(false);
        ip.setBackgroundValue(bgValue);
        imp.startTiming();
        try {
            if (newWindow && imp.getStackSize()>1 && processStack)
                createNewStack(imp, ip);
            else
                scale(ip);
        }
        catch(OutOfMemoryError o) {
            IJ.outOfMemory("Scale");
        }
        IJ.showProgress(1.0);
    }
    
    void createNewStack(ImagePlus imp, ImageProcessor ip) {
        Rectangle r = ip.getRoi();
        boolean crop = r.width!=imp.getWidth() || r.height!=imp.getHeight();
        int nSlices = imp.getStackSize();
        ImageStack stack1 = imp.getStack();
        ImageStack stack2 = new ImageStack(newWidth, newHeight);
        ImageProcessor ip1, ip2;
        boolean interp = interpolate;
        if (imp.getWidth()==1 || imp.getHeight()==1)
            interp = false;
        for (int i=1; i<=nSlices; i++) {
            IJ.showStatus("Scale: " + i + "/" + nSlices);
            ip1 = stack1.getProcessor(i);
            String label = stack1.getSliceLabel(i);
            if (crop) {
                ip1.setRoi(r);
                ip1 = ip1.crop();
            }
            ip1.setInterpolate(interp);
            ip2 = ip1.resize(newWidth, newHeight);
            if (ip2!=null)
                stack2.addSlice(label, ip2);
            IJ.showProgress(i, nSlices);
        }
        ImagePlus imp2 = imp.createImagePlus();
        imp2.setStack(title, stack2);
        Calibration cal = imp2.getCalibration();
        if (cal.scaled()) {
            cal.pixelWidth *= 1.0/xscale;
            cal.pixelHeight *= 1.0/yscale;
        }
        int[] dim = imp.getDimensions();
        imp2.setDimensions(dim[2], dim[3], dim[4]);
        IJ.showProgress(1.0);
        imp2.show();
        imp2.changes = true;
    }

    void scale(ImageProcessor ip) {
        if (newWindow) {
            Rectangle r = ip.getRoi();
            ImagePlus imp2 = imp.createImagePlus();
            imp2.setProcessor(title, ip.resize(newWidth, newHeight));
            Calibration cal = imp2.getCalibration();
            if (cal.scaled()) {
                cal.pixelWidth *= 1.0/xscale;
                cal.pixelHeight *= 1.0/yscale;
            }
            imp2.show();
            imp.trimProcessor();
            imp2.trimProcessor();
            imp2.changes = true;
        } else {
            if (processStack && imp.getStackSize()>1) {
                Undo.reset();
                StackProcessor sp = new StackProcessor(imp.getStack(), ip);
                sp.scale(xscale, yscale, bgValue);
            } else {
                ip.snapshot();
                Undo.setup(Undo.FILTER, imp);
                ip.setSnapshotCopyMode(true);
                ip.scale(xscale, yscale);
                ip.setSnapshotCopyMode(false);
            }
            imp.killRoi();
            imp.updateAndDraw();
            imp.changes = true;
        }
    }
    
    boolean showDialog(ImageProcessor ip) {
        int bitDepth = imp.getBitDepth();
        boolean isStack = imp.getStackSize()>1;
        r = ip.getRoi();
        int width = newWidth;
        if (width==0) width = r.width;
        int height = (int)((double)width*r.height/r.width);
        xscale = Tools.parseDouble(xstr, 0.0);
        yscale = Tools.parseDouble(ystr, 0.0);
        if (xscale!=0.0 && yscale!=0.0) {
            width = (int)(r.width*xscale);
            height = (int)(r.height*yscale);
        } else {
            xstr = "-";
            ystr = "-";
        }
        GenericDialog gd = new GenericDialog("Scale");
        gd.addStringField("X Scale (0.05-25):", xstr);
        gd.addStringField("Y Scale (0.05-25):", ystr);
        gd.setInsets(5, 0, 5);
        gd.addStringField("Width (pixels):", ""+width);
        gd.addStringField("Height (pixels):", ""+height);
        fields = gd.getStringFields();
        for (int i=0; i<3; i++) {
            ((TextField)fields.elementAt(i)).addTextListener(this);
            ((TextField)fields.elementAt(i)).addFocusListener(this);
        }
        xField = (TextField)fields.elementAt(0);
        yField = (TextField)fields.elementAt(1);
        widthField = (TextField)fields.elementAt(2);
        heightField = (TextField)fields.elementAt(3);
        fieldWithFocus = xField;
        gd.addCheckbox("Interpolate", interpolate);
        if (bitDepth==8 || bitDepth==24)
            gd.addCheckbox("Fill with Background Color", fillWithBackground);
        if (isStack)
            gd.addCheckbox("Process Entire Stack", processStack);
        gd.addCheckbox("Create New Window", newWindow);
        title = WindowManager.getUniqueName(imp.getTitle());
        gd.setInsets(10, 0, 0);
        gd.addStringField("Title:", title, 12);
        gd.showDialog();
        if (gd.wasCanceled())
            return false;
        xstr = gd.getNextString();
        ystr = gd.getNextString();
        xscale = Tools.parseDouble(xstr, 0.0);
        yscale = Tools.parseDouble(ystr, 0.0);
        String wstr = gd.getNextString();
        newWidth = (int)Tools.parseDouble(wstr, 0);
        newHeight = (int)Tools.parseDouble(gd.getNextString(), 0);
        if (newHeight!=0 && (wstr.equals("-") || wstr.equals("0")))
                newWidth= (int)(newHeight*(double)r.width/r.height);
        if (newWidth==0 || newHeight==0) {
            IJ.error("Invalid width or height entered");
            return false;
        }
        if (xscale>25.0) xscale = 25.0;
        if (yscale>25.0) yscale = 25.0;
        if (xscale>0.0 && yscale>0.0) {
            newWidth = (int)(r.width*xscale);
            newHeight = (int)(r.height*yscale);
        }
        interpolate = gd.getNextBoolean();
        if (bitDepth==8 || bitDepth==24)
            fillWithBackground = gd.getNextBoolean();
        if (isStack)
            processStack = gd.getNextBoolean();
        newWindow = gd.getNextBoolean();
        if (!newWindow && xscale==0.0) {
            xscale = (double)newWidth/r.width;
            yscale = (double)newHeight/r.height;
        }
        title = gd.getNextString();

        if (fillWithBackground) {
            Color bgc = Toolbar.getBackgroundColor();
            if (bitDepth==8)
                bgValue = ip.getBestIndex(bgc);
            else if (bitDepth==24)
                bgValue = bgc.getRGB();
        } else {
            if (bitDepth==8)
                bgValue = ip.isInvertedLut()?0.0:255.0; // white
            else if (bitDepth==24)
                bgValue = 0xffffffff; // white
        }
        return true;
    }

    public void textValueChanged(TextEvent e) {
        Object source = e.getSource();
        double newXScale = xscale;
        double newYScale = yscale;
        if (source==xField && fieldWithFocus==xField) {
            String newXText = xField.getText();
            newXScale = Tools.parseDouble(newXText,0);
            if (newXScale==0) return;
            if (newXScale!=xscale) {
                int newWidth = (int)(newXScale*r.width);
                widthField.setText(""+newWidth);
                if (constainAspectRatio) {
                    yField.setText(newXText);
                    int newHeight = (int)(newXScale*r.height);
                    heightField.setText(""+newHeight);
                }
            }
        } else if (source==yField && fieldWithFocus==yField) {
            String newYText = yField.getText();
            newYScale = Tools.parseDouble(newYText,0);
            if (newYScale==0) return;
            if (newYScale!=yscale) {
                int newHeight = (int)(newYScale*r.height);
                heightField.setText(""+newHeight);
            }
        } else if (source==widthField && fieldWithFocus==widthField) {
            int newWidth = (int)Tools.parseDouble(widthField.getText(), 0.0);
            if (newWidth!=0) {
                int newHeight = (int)(newWidth*(double)r.height/r.width);
                heightField.setText(""+newHeight);
                xField.setText("-");
                yField.setText("-");
                newXScale = 0.0;
                newYScale = 0.0;
            }
        }
        xscale = newXScale;
        yscale = newYScale;
    }

    public void focusGained(FocusEvent e) {
        fieldWithFocus = e.getSource();
        if (fieldWithFocus==widthField)
            constainAspectRatio = true;
        else if (fieldWithFocus==yField)
            constainAspectRatio = false;
    }

    public void focusLost(FocusEvent e) {}

}