package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import java.awt.image.*;
import ij.plugin.frame.ContrastAdjuster;
import ij.macro.Interpreter;

/** This plugin implements the Image/Color/Make Composite command. */
public class CompositeConverter implements PlugIn {

    public void run(String arg) {
        String[] modes = {"Composite", "Color", "Grayscale"};
        ImagePlus imp = IJ.getImage();
        if (imp.isComposite()) {
            CompositeImage ci = (CompositeImage)imp;
            if (ci.getMode()!=IJ.COMPOSITE) {
                ci.setMode(IJ.COMPOSITE);
                ci.updateAndDraw();
            }
            return;
        }
        String mode = modes[0];
        int z = imp.getStackSize();
        int c = imp.getNChannels();
        if (c==1) {
            c = z;
            imp.setDimensions(c, 1, 1);
            if (c>7) mode = modes[2];
        }
        if (imp.getBitDepth()==24) {
            ImageWindow win = imp.getWindow();
            Point loc = win!=null?win.getLocation():null;
            int slice = imp.getCurrentSlice();
            ImagePlus imp2 = makeComposite(imp);
            if (loc!=null) ImageWindow.setNextLocation(loc);
            imp2.show();
            imp.changes = false;
            if (z==1) {
                imp.hide();
                WindowManager.setCurrentWindow(imp2.getWindow());
            } else {
                if (arg!=null && arg.equals("color"))
                    ((CompositeImage)imp2).setMode(IJ.COLOR);
                imp2.setZ(slice);
                imp.close();
            }
            if (IJ.isMacro() && !Interpreter.isBatchMode())
                IJ.wait(500);
        } else if (c>=2 || (IJ.macroRunning()&&c>=1)) {
            GenericDialog gd = new GenericDialog("Make Composite");
            gd.addChoice("Display Mode:", modes, mode);
            gd.showDialog();
            if (gd.wasCanceled()) return;
            int index = gd.getNextChoiceIndex();
            CompositeImage ci = new CompositeImage(imp, index+1);
            if (imp.getBitDepth()!=8) {
                ci.reset();
                ci.resetDisplayRanges();
            }
            ImageWindow win = imp.getWindow();
            Point location = win!=null?win.getLocation():null;
            imp.hide();
            if (location!=null)
                ImageWindow.setNextLocation(location);
            if (IJ.isMacro())
                IJ.wait(250);
            ci.show();
        } else
            IJ.error("To create a composite, the current image must be\n a stack with at least 2 channels or be in RGB format.");
    }
    
    public static ImagePlus makeComposite(ImagePlus imp) {
        if (imp.getBitDepth()==24)
            return convertRGBToComposite(imp);
        else
            return null;
    }
    
    private static ImagePlus convertRGBToComposite(ImagePlus imp) {
        if (imp.getBitDepth()!=24)
            throw new IllegalArgumentException("RGB image or stack required");
        if (imp.getStackSize()==1)
            return new CompositeImage(imp, IJ.COMPOSITE);
        int width = imp.getWidth();
        int height = imp.getHeight();
        ImageStack stack1 = imp.getStack();
        int n = stack1.getSize();
        ImageStack stack2 = new ImageStack(width, height);
        for (int i=0; i<n; i++) {
            ColorProcessor ip = (ColorProcessor)stack1.getProcessor(1);
            stack1.deleteSlice(1);
            byte[] R = new byte[width*height];
            byte[] G = new byte[width*height];
            byte[] B = new byte[width*height];
            ip.getRGB(R, G, B);
            stack2.addSlice(null, R);
            stack2.addSlice(null, G);
            stack2.addSlice(null, B);
        }
        n *= 3;
        ImagePlus imp2 = new ImagePlus(imp.getTitle(), stack2);
        imp2.setDimensions(3, n/3, 1);
        imp2 = new CompositeImage(imp2, IJ.COMPOSITE);
        return imp2;
    }

}