package ij.plugin;
import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;

/** Implements the conversion commands in the Image/Type submenu. */
public class Converter implements PlugIn {

    /** obsolete */
    public static boolean newWindowCreated;
    private ImagePlus imp;

    public void run(String arg) {
        imp = WindowManager.getCurrentImage();
        if (imp!=null) {
            if (imp.isComposite() && arg.equals("RGB Color") && !imp.getStack().isRGB() && !imp.getStack().isHSB() && !imp.getStack().isLab()) {
                if (imp.getWindow()==null && !ij.macro.Interpreter.isBatchMode())
                    RGBStackConverter.convertToRGB(imp);
                else {
                    (new RGBStackConverter()).run("");
                    imp.setTitle(imp.getTitle()); // updates size in Window menu
                }
            } else if (imp.lock()) {
                convert(arg);
                imp.unlock();
                imp.setTitle(imp.getTitle());
            } else 
                IJ.log("<<Converter: image is locked ("+imp+")>>");
        } else
            IJ.noImage();
    }

    /** Converts the ImagePlus to the specified image type. The string
    argument corresponds to one of the labels in the Image/Type submenu
    ("8-bit", "16-bit", "32-bit", "8-bit Color", "RGB Color", "RGB Stack" or "HSB Stack"). */
    public void convert(String item) {
        int type = imp.getType();
        ImageStack stack = null;
        if (imp.getStackSize()>1)
            stack = imp.getStack();
        String msg = "Converting to " + item;
        IJ.showStatus(msg + "...");
        long start = System.currentTimeMillis();
        Roi roi = imp.getRoi();
        imp.deleteRoi();
        if (imp.isThreshold())
            imp.getProcessor().resetThreshold();
        boolean saveChanges = imp.changes;
        imp.changes = IJ.getApplet()==null; //if not applet, set 'changes' flag
        ImageWindow win = imp.getWindow();
        try {
            if (stack!=null) {
                boolean wasVirtual = stack.isVirtual();
                // do stack conversions
                if (stack.isRGB() && item.equals("RGB Color")) {
                    new ImageConverter(imp).convertRGBStackToRGB();
                    if (win!=null) new ImageWindow(imp, imp.getCanvas()); // replace StackWindow with ImageWindow
                } else if (stack.isHSB() && item.equals("RGB Color")) {
                    new ImageConverter(imp).convertHSBToRGB();
                    if (win!=null) new ImageWindow(imp, imp.getCanvas());
                } else if (stack.isLab() && item.equals("RGB Color")) {
                    new ImageConverter(imp).convertLabToRGB();
                    if (win!=null) new ImageWindow(imp, imp.getCanvas());
                } else if (item.equals("8-bit"))
                    new StackConverter(imp).convertToGray8();
                else if (item.equals("16-bit"))
                    new StackConverter(imp).convertToGray16();
                else if (item.equals("32-bit"))
                    new StackConverter(imp).convertToGray32();
                else if (item.equals("RGB Color"))
                    new StackConverter(imp).convertToRGB();
                else if (item.equals("RGB Stack"))
                    new StackConverter(imp).convertToRGBHyperstack();
                else if (item.equals("HSB Stack"))
                    new StackConverter(imp).convertToHSBHyperstack();
                else if (item.equals("Lab Stack"))
                    new StackConverter(imp).convertToLabHyperstack();
                else if (item.equals("8-bit Color")) {
                    int nColors = getNumber();
                    if (nColors!=0)
                        new StackConverter(imp).convertToIndexedColor(nColors);
                } else throw new IllegalArgumentException();
                if (wasVirtual) imp.setTitle(imp.getTitle());
            } else {
                // do single image conversions
                Undo.setup(Undo.TYPE_CONVERSION, imp);
                ImageConverter ic = new ImageConverter(imp);
                if (item.equals("8-bit"))
                    ic.convertToGray8();
                else if (item.equals("16-bit"))
                    ic.convertToGray16();
                else if (item.equals("32-bit"))
                    ic.convertToGray32();
                else if (item.equals("RGB Stack")) {
                    Undo.reset(); // Reversible; no need for Undo
                    ic.convertToRGBStack();
                } else if (item.equals("HSB Stack")) {
                    Undo.reset();
                    ic.convertToHSB();
                } else if (item.equals("Lab Stack")) {
                    Undo.reset();
                    ic.convertToLab();
                } else if (item.equals("RGB Color")) {
                    ic.convertToRGB();
                } else if (item.equals("8-bit Color")) {
                    int nColors = getNumber();
                    start = System.currentTimeMillis();
                    if (nColors!=0)
                        ic.convertRGBtoIndexedColor(nColors);
                } else {
                    imp.changes = saveChanges;
                    return;
                }
                IJ.showProgress(1.0);
            }
            
        }
        catch (IllegalArgumentException e) {
            unsupportedConversion(imp);
            IJ.showStatus("");
            Undo.reset();
            imp.changes = saveChanges;
            Menus.updateMenus();
            Macro.abort();
            return;
        }
        if (roi!=null)
            imp.setRoi(roi);
        IJ.showTime(imp, start, "");
        imp.repaintWindow();
        Menus.updateMenus();
    }

    void unsupportedConversion(ImagePlus imp) {
        IJ.error("Converter",
            "Supported Conversions:\n" +
            " \n" +
            "8-bit -> 16-bit*\n" +
            "8-bit -> 32-bit*\n" +
            "8-bit -> RGB Color*\n" +
            "16-bit -> 8-bit*\n" +
            "16-bit -> 32-bit*\n" +
            "16-bit -> RGB Color*\n" +
            "32-bit -> 8-bit*\n" +
            "32-bit -> 16-bit\n" +
            "32-bit -> RGB Color*\n" +
            "8-bit Color -> 8-bit (grayscale)*\n" +
            "8-bit Color -> RGB Color\n" +
            "RGB -> 8-bit (grayscale)*\n" +
            "RGB -> 8-bit Color*\n" +
            "RGB -> RGB Stack*\n" +
            "RGB -> HSB Stack*\n" +
            "RGB -> Lab Stack\n" +
            "RGB Stack -> RGB Color\n" +
            "HSB Stack -> RGB Color\n" +
            " \n" +
            "* works with stacks\n"
            );
    }

    int getNumber() {
        if (imp.getType()!=ImagePlus.COLOR_RGB)
            return 256;
        GenericDialog gd = new GenericDialog("MedianCut");
        gd.addNumericField("Number of Colors (2-256):", 256, 0);
        gd.showDialog();
        if (gd.wasCanceled())
            return 0;
        int n = (int)gd.getNextNumber();
        if (n<2) n = 2;
        if (n>256) n = 256;
        return n;
    }
        
}