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 Image/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 String zstr = "1.0";
    private static int newWidth, newHeight;
    private int newDepth;
    private boolean doZScaling;
    private static boolean averageWhenDownsizing = true;
    private static boolean newWindow = true;
    private static int interpolationMethod = ImageProcessor.BILINEAR;
    private String[] methods = ImageProcessor.getInterpolationMethods();
    private static boolean fillWithBackground;
    private static boolean processStack = true;
    private double xscale, yscale, zscale;
    private String title = "Untitled";
    private Vector fields;
    private double bgValue;
    private boolean constainAspectRatio = true;
    private TextField xField, yField, zField, widthField, heightField, depthField;
    private Rectangle r;
    private Object fieldWithFocus;
    private int oldDepth;

    public void run(String arg) {
        imp = IJ.getImage();
        Roi roi = imp.getRoi();
        if (roi!=null && !roi.isArea())
            imp.deleteRoi(); // ignore any line selection
        ImageProcessor ip = imp.getProcessor();
        if (!showDialog(ip))
            return;
        doZScaling = newDepth>0 && newDepth!=oldDepth;
        if (doZScaling) {
            newWindow = true;
            processStack = true;
        }
        if ((ip.getWidth()>1 && ip.getHeight()>1) || newWindow)
            ip.setInterpolationMethod(interpolationMethod);
        else
            ip.setInterpolationMethod(ImageProcessor.NONE);
        ip.setBackgroundValue(bgValue);
        imp.startTiming();
        try {
            if (newWindow && imp.getStackSize()>1 && processStack)
                createNewStack(imp, ip);
            else {
                Overlay overlay = imp.getOverlay();
                if (imp.getHideOverlay())
                    overlay = null;
                if (overlay!=null && overlay.size()!=1)
                    overlay = null;
                if (overlay!=null)
                    overlay = overlay.duplicate();
                scale(ip, overlay);
            }
        }
        catch(OutOfMemoryError o) {
            IJ.outOfMemory("Scale");
        }
        IJ.showProgress(1.0);
    }
    
    void createNewStack(ImagePlus imp, ImageProcessor ip) {
        int nSlices = imp.getStackSize();
        int w=imp.getWidth(), h=imp.getHeight();
        ImagePlus imp2 = imp.createImagePlus();
        Rectangle r = ip.getRoi();
        boolean crop = r.width!=imp.getWidth() || r.height!=imp.getHeight();
        ImageStack stack1 = imp.getStack();
        ImageStack stack2 = new ImageStack(newWidth, newHeight);
        boolean virtualStack = stack1.isVirtual();
        double min = imp.getDisplayRangeMin();
        double max = imp.getDisplayRangeMax();
        ImageProcessor ip1, ip2;
        int method = interpolationMethod;
        if (w==1 || h==1)
            method = ImageProcessor.NONE;
        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.setInterpolationMethod(method);
            ip2 = ip1.resize(newWidth, newHeight, averageWhenDownsizing);
            if (ip2!=null)
                stack2.addSlice(label, ip2);
            IJ.showProgress(i, nSlices);
        }
        imp2.setStack(title, stack2);
        if (virtualStack)
            imp2.setDisplayRange(min, max);
        Calibration cal = imp2.getCalibration();
        if (cal.scaled()) {
            cal.pixelWidth *= 1.0/xscale;
            cal.pixelHeight *= 1.0/yscale;
        }
        Overlay overlay = imp.getOverlay();
        if (imp.getHideOverlay())
            overlay = null;
        if (overlay!=null) {
            overlay = overlay.duplicate();
            Overlay overlay2 = new Overlay();
            for (int i=0; i<overlay.size(); i++) {
                Roi roi = overlay.get(i);
                Rectangle bounds = roi.getBounds();
                if (roi instanceof ImageRoi && bounds.x==0 && bounds.y==0) {
                    ImageRoi iroi = (ImageRoi)roi;
                    ImageProcessor processor = iroi.getProcessor();
                    processor.setInterpolationMethod(method);
                    processor = processor.resize(newWidth, newHeight, averageWhenDownsizing);
                    iroi.setProcessor(processor);
                    overlay2.add(iroi);
                }
            }
            if (overlay2.size()>0)
                imp2.setOverlay(overlay2);
        }
        IJ.showProgress(1.0);
        int[] dim = imp.getDimensions();
        imp2.setDimensions(dim[2], dim[3], dim[4]);
        if (imp.isComposite()) {
            imp2 = new CompositeImage(imp2, ((CompositeImage)imp).getMode());
            ((CompositeImage)imp2).copyLuts(imp);
        }
        if (imp.isHyperStack())
            imp2.setOpenAsHyperStack(true);
        if (doZScaling) {
            Resizer resizer = new Resizer();
            resizer.setAverageWhenDownsizing(averageWhenDownsizing);
            imp2 = resizer.zScale(imp2, newDepth, interpolationMethod);
        }
        if (imp2!=null) {
            imp2.show();
            imp2.changes = true;
        }
    }

    private void scale(ImageProcessor ip, Overlay overlay) {
        if (newWindow) {
            Rectangle r = ip.getRoi();
            ImagePlus imp2 = imp.createImagePlus();
            imp2.setProcessor(title, ip.resize(newWidth, newHeight, averageWhenDownsizing));
            Calibration cal = imp2.getCalibration();
            if (cal.scaled()) {
                cal.pixelWidth *= 1.0/xscale;
                cal.pixelHeight *= 1.0/yscale;
            }
            if (overlay!=null) {
                Roi roi = overlay.get(0);
                Rectangle bounds = roi.getBounds();
                if (roi instanceof ImageRoi && bounds.x==0 && bounds.y==0) {
                    ImageRoi iroi = (ImageRoi)roi;
                    ImageProcessor processor = iroi.getProcessor();
                    processor.setInterpolationMethod(interpolationMethod);
                    processor =processor.resize(newWidth, newHeight, averageWhenDownsizing);
                    iroi.setProcessor(processor);
                    imp2.setOverlay(new Overlay(iroi));
                }
            }
            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.deleteRoi();
            imp.updateAndDraw();
            imp.changes = true;
        }
    }
    
    boolean showDialog(ImageProcessor ip) {
        String macroOptions = Macro.getOptions();
        if (macroOptions!=null) {
            if (macroOptions.indexOf(" interpolate")!=-1)
                macroOptions.replaceAll(" interpolate", " interpolation=Bilinear");
            else if (macroOptions.indexOf(" interpolation=")==-1)
                macroOptions = macroOptions+" interpolation=None";
            Macro.setOptions(macroOptions);
        }
        int bitDepth = imp.getBitDepth();
        int stackSize = imp.getStackSize();
        boolean isStack = stackSize>1;
        oldDepth = stackSize;
        if (isStack) {
            xstr = "1.0";
            ystr = "1.0";
            zstr = "1.0";
        }
        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);
        zscale = 1.0;
        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:", xstr);
        gd.addStringField("Y Scale:", ystr);
        if (isStack)
            gd.addStringField("Z Scale:", zstr);
        gd.setInsets(5, 0, 5);
        gd.addStringField("Width (pixels):", ""+width);
        gd.addStringField("Height (pixels):", ""+height);
        if (isStack) {
            String label = "Depth (images):";
            if (imp.isHyperStack()) {
                int slices = imp.getNSlices();
                int frames = imp.getNFrames();
                if (slices==1&&frames>1) {
                    label = "Depth (frames):";
                    oldDepth = frames;
                } else {
                    label = "Depth (slices):";
                    oldDepth = slices;
                }
            }
            gd.addStringField(label, ""+oldDepth);
        }
        fields = gd.getStringFields();
        for (int i=0; i<fields.size(); i++) {
            ((TextField)fields.elementAt(i)).addTextListener(this);
            ((TextField)fields.elementAt(i)).addFocusListener(this);
        }
        xField = (TextField)fields.elementAt(0);
        yField = (TextField)fields.elementAt(1);
        if (isStack) {
            zField = (TextField)fields.elementAt(2);
            widthField = (TextField)fields.elementAt(3);
            heightField = (TextField)fields.elementAt(4);
            depthField = (TextField)fields.elementAt(5);
        } else {
            widthField = (TextField)fields.elementAt(2);
            heightField = (TextField)fields.elementAt(3);
        }
        fieldWithFocus = xField;
        gd.addChoice("Interpolation:", methods, methods[interpolationMethod]);
        if (bitDepth==8 || bitDepth==24)
            gd.addCheckbox("Fill with background color", fillWithBackground);
        gd.addCheckbox("Average when downsizing", averageWhenDownsizing);
        boolean hyperstack = imp.isHyperStack() || imp.isComposite();
        if (isStack && !hyperstack)
            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);
        if (isStack) {
            zstr = gd.getNextString();
            zscale = Tools.parseDouble(zstr, 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);
        else if (newWidth!=0 && newHeight==0)
            newHeight= (int)(newWidth * (double)r.height/r.width);
        else if (newHeight!=0 && newWidth==0)
            newWidth = (int)(newHeight * (double)r.width/r.height);
        if (newWidth==0 || newHeight==0) {
            IJ.error("Scaler", "Width or height is 0");
            return false;
        }
        if (xscale>0.0 && yscale>0.0) {
            newWidth = (int)(r.width*xscale);
            newHeight = (int)(r.height*yscale);
        }
        if (isStack) {
            newDepth = (int)Tools.parseDouble(gd.getNextString(), 0);
            if (newDepth==stackSize && zscale!=1.0 && zscale>0.0)
                newDepth = (int)(stackSize*zscale);
        }
        interpolationMethod = gd.getNextChoiceIndex();
        if (bitDepth==8 || bitDepth==24)
            fillWithBackground = gd.getNextBoolean();
        averageWhenDownsizing = gd.getNextBoolean();
        if (isStack && !hyperstack)
            processStack = gd.getNextBoolean();
        if (hyperstack)
            processStack = true;
        newWindow = gd.getNextBoolean();
        if (xscale==0.0) {
            xscale = (double)newWidth/r.width;
            yscale = (double)newHeight/r.height;
        }
        gd.setSmartRecording(true);
        title = gd.getNextString();

        if (fillWithBackground) {
            Color bgc = Toolbar.getBackgroundColor();
            if (bitDepth==8)
                bgValue = ip.getBestIndex(bgc);
            else if (bitDepth==24)
                bgValue = bgc.getRGB();
        } else
            bgValue = 0.0;
        return true;
    }

    public void textValueChanged(TextEvent e) {
        Object source = e.getSource();
        double newXScale = xscale;
        double newYScale = yscale;
        double newZScale = zscale;
        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==zField && fieldWithFocus==zField) {
            String newZText = zField.getText();
            newZScale = Tools.parseDouble(newZText,0);
            if (newZScale==0) return;
            if (newZScale!=zscale) {
                int nSlices = imp.getStackSize();
                if (imp.isHyperStack()) {
                    int slices = imp.getNSlices();
                    int frames = imp.getNFrames();
                    if (slices==1&&frames>1)
                        nSlices = frames;
                    else
                        nSlices = slices;
                }
                int newDepth= (int)(newZScale*nSlices);
                depthField.setText(""+newDepth);
            }
        } 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;
            }
       } else if (source==depthField && fieldWithFocus==depthField) {
            int newDepth = (int)Tools.parseDouble(depthField.getText(), 0.0);
            if (newDepth!=0) {
                zField.setText("-");
                newZScale = 0.0;
            }
        }
        xscale = newXScale;
        yscale = newYScale;
        zscale = newZScale;
    }

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

    public void focusLost(FocusEvent e) {}

}