package ij;
import ij.process.*;
import ij.io.*;
import ij.gui.ImageCanvas;
import ij.util.Tools;
import java.io.*;
import java.awt.Font;
import java.awt.image.ColorModel;

/** This class represents an array of disk-resident images. */
public class VirtualStack extends ImageStack {
    private static final int INITIAL_SIZE = 100;
    private String path;
    private int nSlices;
    private String[] names;
    private String[] labels;
    private int bitDepth;
    private ImageProcessor ip;
    
    /** Default constructor. */
    public VirtualStack() { }

    /** Creates an empty virtual stack. */
    public VirtualStack(int width, int height, ColorModel cm, String path) {
        super(width, height, cm);
        this.path = path;
        names = new String[INITIAL_SIZE];
        labels = new String[INITIAL_SIZE];
        //IJ.log("VirtualStack: "+path);
    }

    /** Creates a virtual stack with no backing storage.
    This example creates a one million slice virtual
    stack that uses just 1MB of RAM:
    <pre>
    stack = new VirtualStack(1024,1024,1000000);
    new ImagePlus("No Backing Store Virtual Stack",stack).show();
    </pre>
    */
    public VirtualStack(int width, int height, int slices) {
        super(width, height, null);
        nSlices = slices;
        bitDepth = 8;
    }

     /** Adds an image to the end of the stack. */
    public void addSlice(String name) {
        if (name==null) 
            throw new IllegalArgumentException("'name' is null!");
        nSlices++;
       //IJ.log("addSlice: "+nSlices+"  "+name);
       if (nSlices==names.length) {
            String[] tmp = new String[nSlices*2];
            System.arraycopy(names, 0, tmp, 0, nSlices);
            names = tmp;
            tmp = new String[nSlices*2];
            System.arraycopy(labels, 0, tmp, 0, nSlices);
            labels = tmp;
        }
        names[nSlices-1] = name;
    }

   /** Does nothing. */
    public void addSlice(String sliceLabel, Object pixels) {
    }

    /** Does nothing.. */
    public void addSlice(String sliceLabel, ImageProcessor ip) {
    }
    
    /** Does noting. */
    public void addSlice(String sliceLabel, ImageProcessor ip, int n) {
    }

    /** Deletes the specified slice, were 1<=n<=nslices. */
    public void deleteSlice(int n) {
        if (n<1 || n>nSlices)
            throw new IllegalArgumentException("Argument out of range: "+n);
            if (nSlices<1)
                return;
            for (int i=n; i<nSlices; i++)
                names[i-1] = names[i];
            names[nSlices-1] = null;
            nSlices--;
        }
    
    /** Deletes the last slice in the stack. */
    public void deleteLastSlice() {
        if (nSlices>0)
            deleteSlice(nSlices);
    }
       
   /** Returns the pixel array for the specified slice, were 1<=n<=nslices. */
    public Object getPixels(int n) {
        ImageProcessor ip = getProcessor(n);
        if (ip!=null)
            return ip.getPixels();
        else
            return null;
    }       
    
     /** Assigns a pixel array to the specified slice,
        were 1<=n<=nslices. */
    public void setPixels(Object pixels, int n) {
    }

   /** Returns an ImageProcessor for the specified slice,
        were 1<=n<=nslices. Returns null if the stack is empty.
    */
    public ImageProcessor getProcessor(int n) {
        //IJ.log("getProcessor: "+n+"  "+names[n-1]+"  "+bitDepth);
        if (path==null) {
            if (ip==null)
                ip = new ByteProcessor(getWidth(), getHeight());
            return ip;
        }
        Opener opener = new Opener();
        opener.setSilentMode(true);
        IJ.redirectErrorMessages(true);
        ImagePlus imp = opener.openImage(path, names[n-1]);
        IJ.redirectErrorMessages(false);
        ImageProcessor ip = null;
        int depthThisImage = 0;
        if (imp!=null) {
            int w = imp.getWidth();
            int h = imp.getHeight();
            int type = imp.getType();
            ColorModel cm = imp.getProcessor().getColorModel();
            String info = (String)imp.getProperty("Info");
            if (info!=null && !(info.startsWith("Software")||info.startsWith("ImageDescription")))
                labels[n-1] = info;
            depthThisImage = imp.getBitDepth();
            ip = imp.getProcessor();
            ip.setOverlay(imp.getOverlay());
        } else {
            File f = new File(path, names[n-1]);
            String msg = f.exists()?"Error opening ":"File not found: ";
            ip = new ByteProcessor(getWidth(), getHeight());
            ip.invert();
            int size = getHeight()/20;
            if (size<9) size=9;
            Font font = new Font("Helvetica", Font.PLAIN, size);
            ip.setFont(font);
            ip.setAntialiasedText(true);
            ip.setColor(0);
            ip.drawString(msg+names[n-1], size, size*2);
            depthThisImage = 8;
        }
        if (depthThisImage!=bitDepth) {
            switch (bitDepth) {
                case 8: ip=ip.convertToByte(true); break;
                case 16: ip=ip.convertToShort(true); break;
                case 24:  ip=ip.convertToRGB(); break;
                case 32: ip=ip.convertToFloat(); break;
            }
        }
        if (ip.getWidth()!=getWidth() || ip.getHeight()!=getHeight()) {
            ImageProcessor ip2 = ip.createProcessor(getWidth(), getHeight());
            ip2.insert(ip, 0, 0);
            ip = ip2;
        }
        return ip;
     }
 
    /** Currently not implemented */
    public int saveChanges(int n) {
        return -1;
    }

     /** Returns the number of slices in this stack. */
    public int getSize() {
        return nSlices;
    }

    /** Returns the label of the Nth image. */
    public String getSliceLabel(int n) {
        if (labels==null)
            return null;
        String label = labels[n-1];
        if (label==null)
            return names[n-1];
        else if (label.length()<=60)
            return label;
        else
            return names[n-1]+"\n"+label;
    }
    
    /** Returns null. */
    public Object[] getImageArray() {
        return null;
    }

   /** Does nothing. */
    public void setSliceLabel(String label, int n) {
    }

    /** Always return true. */
    public boolean isVirtual() {
        return true;
    }

   /** Does nothing. */
    public void trim() {
    }
    
    /** Returns the path to the directory containing the images. */
    public String getDirectory() {
        return path;
    }
        
    /** Returns the file name of the specified slice, were 1<=n<=nslices. */
    public String getFileName(int n) {
        return names[n-1];
    }
    
    /** Sets the bit depth (8, 16, 24 or 32). */
    public void setBitDepth(int bitDepth) {
        this.bitDepth = bitDepth;
    }

    /** Returns the bit depth (8, 16, 24 or 32), or 0 if the bit depth is not known. */
    public int getBitDepth() {
        return bitDepth;
    }
    
    public ImageStack sortDicom(String[] strings, String[] info, int maxDigits) {
        int n = getSize();
        String[] names2 = new String[n];
        for (int i=0; i<n; i++)
            names2[i] = names[i];
        for (int i=0; i<n; i++) {
            int slice = (int)Tools.parseDouble(strings[i].substring(strings[i].length()-maxDigits), 0.0);
            if (slice==0) return null;
            names[i] = names2[slice-1];
            labels[i] = info[slice-1];
        }
        return this;
    }

}