package ij.plugin;
import ij.*;
import ij.gui.*;
import ij.process.*;
import ij.measure.*;
import ij.io.*;
import ij.util.Tools;
import ij.plugin.frame.Editor;
import ij.plugin.filter.Analyzer;
import ij.text.TextWindow;
import ij.macro.Interpreter;
import java.awt.*;
import java.util.*;
import java.lang.reflect.*;

/** This plugin implements the Image/Show Info command. */
public class ImageInfo implements PlugIn {

    public void run(String arg) {
        ImagePlus imp = WindowManager.getCurrentImage();
        if (imp==null)
            showInfo();
        else {
            String info = getImageInfo(imp);
            if (info.contains("----"))
                showInfo(imp, info, 450, 500);
            else {
                int inc = info.contains("No Selection")?0:75;
                showInfo(imp, info, 300, 350+inc);
            }
        }
    }
    
    private void showInfo() {
        String s = new String("");
        if (IJ.getInstance()!=null)
            s += IJ.getInstance().getInfo()+"\n \n";
        s += "No images are open\n";
        Dimension screen = IJ.getScreenSize();
        s += "ImageJ home: "+IJ.getDir("imagej")+"\n";
        s += "Java home: "+System.getProperty("java.home")+"\n";
        s += "Screen size: "+screen.width+"x"+screen.height+"\n";
        if (IJ.isMacOSX()) {
            String time = " ("+ImageWindow.setMenuBarTime+"ms)";
            s += "SetMenuBarCount: "+Menus.setMenuBarCount+time+"\n";
        }
        new TextWindow("Info", s, 600, 300);
    }

    public String getImageInfo(ImagePlus imp) {
        ImageProcessor ip = imp.getProcessor();
        String infoProperty = null;
        if (imp.getStackSize()>1) {
            ImageStack stack = imp.getStack();
            String label = stack.getSliceLabel(imp.getCurrentSlice());
            if (label!=null && label.indexOf('\n')>0)
                infoProperty = label;
        }
        if (infoProperty==null) {
            infoProperty = (String)imp.getProperty("Info");
            if (infoProperty==null)
                infoProperty = getExifData(imp);
        }
        String info = getInfo(imp, ip);
        if (infoProperty!=null)
            return infoProperty + "\n------------------------------------------------------\n" + info;
        else
            return info;        
    }
    
    private String getExifData(ImagePlus imp) {
        FileInfo fi = imp.getOriginalFileInfo();
        if (fi==null)
            return null;
        String directory = fi.directory;
        String name = fi.fileName;
        if (directory==null)
            return null;
        if ((name==null||name.equals("")) && imp.getStack().isVirtual())
            name = imp.getStack().getSliceLabel(imp.getCurrentSlice());
        if (name==null || !(name.endsWith("jpg")||name.endsWith("JPG")))
            return null;
        String path = directory + name;
        String metadata = null;
        try {
            Class c = IJ.getClassLoader().loadClass("Exif_Reader");
            if (c==null) return null;
            String methodName = "getMetadata";
            Class[] argClasses = new Class[1];
            argClasses[0] = methodName.getClass();
            Method m = c.getMethod("getMetadata", argClasses);
            Object[] args = new Object[1];
            args[0] = path;
            Object obj = m.invoke(null, args);
            metadata = obj!=null?obj.toString():null;
        } catch(Exception e) {
            return null;
        }
        if (metadata!=null && !metadata.startsWith("Error:"))
            return metadata;
        else
            return null;
    }

    private String getInfo(ImagePlus imp, ImageProcessor ip) {
        String s = new String("");
        if (IJ.getInstance()!=null)
            s += IJ.getInstance().getInfo()+"\n \n";
        s += "Title: " + imp.getTitle() + "\n";
        Calibration cal = imp.getCalibration();
        int stackSize = imp.getStackSize();
        int channels = imp.getNChannels();
        int slices = imp.getNSlices();
        int frames = imp.getNFrames();
        int digits = imp.getBitDepth()==32?4:0;
        int dp, dp2;
        boolean nonUniformUnits = !cal.getXUnit().equals(cal.getYUnit());
        String xunit = cal.getXUnit();
        String yunit = cal.getYUnit();
        String zunit = cal.getZUnit();
        if (cal.scaled()) {
            String xunits = cal.getUnits();
            String yunits = xunits;
            String zunits = xunits;
            if (nonUniformUnits) {
                xunits = xunit;
                yunits = yunit;
                zunits = zunit;
            }
            double pw = imp.getWidth()*cal.pixelWidth;
            double ph = imp.getHeight()*cal.pixelHeight;
            s += "Width:  "+d2s(pw)+" " + xunits+" ("+imp.getWidth()+")\n";
            s += "Height:  "+d2s(ph)+" " + yunits+" ("+imp.getHeight()+")\n";
            if (slices>1) {
                double pd = slices*cal.pixelDepth;
                s += "Depth:  "+d2s(pd)+" " + zunits+" ("+slices+")\n";
            }
            s += "Size:  "+ImageWindow.getImageSize(imp)+"\n";
            double xResolution = 1.0/cal.pixelWidth;
            double yResolution = 1.0/cal.pixelHeight;
            if (xResolution==yResolution)
                s += "Resolution:  "+d2s(xResolution) + " pixels per "+xunit+"\n";
            else {
                s += "X Resolution:  "+d2s(xResolution) + " pixels per "+xunit+"\n";
                s += "Y Resolution:  "+d2s(yResolution) + " pixels per "+yunit+"\n";
            }
        } else {
            s += "Width:  " + imp.getWidth() + " pixels\n";
            s += "Height:  " + imp.getHeight() + " pixels\n";
            if (stackSize>1)
                s += "Depth:  " + slices + " pixels\n";
            s += "Size:  "+ImageWindow.getImageSize(imp)+"\n";
        }
        if (stackSize>1) {
            String vunit = cal.getUnit()+"^3";
            if (nonUniformUnits)
                vunit = "("+xunit+" x "+yunit+" x "+zunit+")";
            s += "Voxel size: "+d2s(cal.pixelWidth)+"x"+d2s(cal.pixelHeight)+"x"+d2s(cal.pixelDepth)+" "+vunit+"\n";
        } else {
            String punit = cal.getUnit()+"^2";
            if (nonUniformUnits)
                punit = "("+xunit+" x "+yunit+")";
            dp = Tools.getDecimalPlaces(cal.pixelWidth, cal.pixelHeight);
            s += "Pixel size: "+d2s(cal.pixelWidth)+"x"+d2s(cal.pixelHeight)+" "+punit+"\n";
        }

        s += "ID: "+imp.getID()+"\n";
        int type = imp.getType();
        switch (type) {
            case ImagePlus.GRAY8:
                s += "Bits per pixel: 8 ";
                String lut = "LUT";
                if (imp.getProcessor().isColorLut())
                    lut = "color " + lut;
                else
                    lut = "grayscale " + lut;
                if (imp.isInvertedLut())
                    lut = "inverting " + lut;
                s += "(" + lut + ")\n";
                if (imp.getNChannels()>1)
                    s += displayRanges(imp);
                else
                    s += "Display range: "+(int)ip.getMin()+"-"+(int)ip.getMax()+"\n";
                break;
            case ImagePlus.GRAY16: case ImagePlus.GRAY32:
                if (type==ImagePlus.GRAY16) {
                    String sign = cal.isSigned16Bit()?"signed":"unsigned";
                    s += "Bits per pixel: 16 ("+sign+")\n";
                } else
                    s += "Bits per pixel: 32 (float)\n";
                if (imp.getNChannels()>1)
                    s += displayRanges(imp);
                else {
                    s += "Display range: ";
                    double min = ip.getMin();
                    double max = ip.getMax();
                    if (cal.calibrated()) {
                        min = cal.getCValue((int)min);
                        max = cal.getCValue((int)max);
                    }
                    s += d2s(min) + " - " + d2s(max) + "\n";
                }
                break;
            case ImagePlus.COLOR_256:
                s += "Bits per pixel: 8 (color LUT)\n";
                break;
            case ImagePlus.COLOR_RGB:
                s += "Bits per pixel: 32 (RGB)\n";
                break;
        }
        double interval = cal.frameInterval;    
        double fps = cal.fps;   
        if (stackSize>1) {
            ImageStack stack = imp.getStack();
            int slice = imp.getCurrentSlice();
            String number = slice + "/" + stackSize;
            String label = stack.getShortSliceLabel(slice);
            if (label!=null && label.length()>0)
                label = " (" + label + ")";
            else
                label = "";
            if (interval>0.0 || fps!=0.0) {
                s += "Frame: " + number + label + "\n";
                if (fps!=0.0) {
                    String sRate = Math.abs(fps-Math.round(fps))<0.00001?IJ.d2s(fps,0):IJ.d2s(fps,5);
                    s += "Frame rate: " + sRate + " fps\n";
                }
                if (interval!=0.0)
                    s += "Frame interval: " + ((int)interval==interval?IJ.d2s(interval,0):IJ.d2s(interval,5)) + " " + cal.getTimeUnit() + "\n";
            } else
                s += "Image: " + number + label + "\n";
            if (imp.isHyperStack()) {
                if (channels>1)
                    s += "  Channel: " + imp.getChannel() + "/" + channels + "\n";
                if (slices>1)
                    s += "  Slice: " + imp.getSlice() + "/" + slices + "\n";
                if (frames>1)
                    s += "  Frame: " + imp.getFrame() + "/" + frames + "\n";
            }
            if (imp.isComposite()) {
                if (!imp.isHyperStack() && channels>1)
                    s += "  Channels: " + channels + "\n";
                String mode = ((CompositeImage)imp).getModeAsString();
                s += "  Composite mode: \"" + mode + "\"\n";
            }
            if (stack.isVirtual()) {
                String stackType = "virtual";
                if (stack instanceof AVI_Reader)
                    stackType += " (AVI Reader)";
                if (stack instanceof FileInfoVirtualStack)
                    stackType += " (FileInfoVirtualStack)";
                if (stack instanceof ListVirtualStack)
                    stackType += " (ListVirtualStack)";
                s += "Stack type: " + stackType+ "\n";
            }
        }
        
        if (imp.isLocked())
            s += "**Locked**\n";
        if (ip.getMinThreshold()==ImageProcessor.NO_THRESHOLD)
            s += "No threshold\n";
        else {
            double lower = ip.getMinThreshold();
            double upper = ip.getMaxThreshold();
            String uncalibrated = "";
            if (cal.calibrated()) {
                uncalibrated = " ("+(int)lower+"-"+(int)upper+")";
                lower = cal.getCValue((int)lower);
                upper = cal.getCValue((int)upper);
            }
            s += "Threshold: "+d2s(lower)+"-"+d2s(upper)+uncalibrated+"\n";
        }
        ImageCanvas ic = imp.getCanvas();
        double mag = ic!=null?ic.getMagnification():1.0;
        if (mag!=1.0)
            s += "Magnification: " + IJ.d2s(mag,2) + "\n";
            
        if (cal.calibrated()) {
            s += " \n";
            int curveFit = cal.getFunction();
            s += "Calibration function: ";
            if (curveFit==Calibration.UNCALIBRATED_OD)
                s += "Uncalibrated OD\n";           
            else if (curveFit==Calibration.CUSTOM)
                s += "Custom lookup table\n";           
            else
                s += CurveFitter.fList[curveFit]+"\n";
            double[] c = cal.getCoefficients();
            if (c!=null) {
                s += "  a: "+IJ.d2s(c[0],6)+"\n";
                s += "  b: "+IJ.d2s(c[1],6)+"\n";
                if (c.length>=3)
                    s += "  c: "+IJ.d2s(c[2],6)+"\n";
                if (c.length>=4)
                    s += "  c: "+IJ.d2s(c[3],6)+"\n";
                if (c.length>=5)
                    s += "  c: "+IJ.d2s(c[4],6)+"\n";
            }
            s += "  Unit: \""+cal.getValueUnit()+"\"\n";            
        } else
            s += "Uncalibrated\n";

        FileInfo fi = imp.getOriginalFileInfo();
        if (fi!=null) {
            if (fi.url!=null && !fi.url.equals(""))
                s += "URL: " + fi.url + "\n";
            else if (fi.directory!=null && fi.fileName!=null)
                s += "Path: " + fi.directory + fi.fileName + "\n";
        }
        
        ImageWindow win = imp.getWindow();
        if (win!=null) {
            Point loc = win.getLocation();
            Dimension screen = IJ.getScreenSize();
            s += "Screen location: "+loc.x+","+loc.y+" ("+screen.width+"x"+screen.height+")\n";
        }
        if (IJ.isMacOSX()) {
            String time = " ("+ImageWindow.setMenuBarTime+"ms)";
            s += "SetMenuBarCount: "+Menus.setMenuBarCount+time+"\n";
        }
        
        String zOrigin = stackSize>1||cal.zOrigin!=0.0?","+d2s(cal.zOrigin):"";
        String origin = d2s(cal.xOrigin)+","+d2s(cal.yOrigin)+zOrigin;
        if (!origin.equals("0,0") || cal.getInvertY())
            s += "Coordinate origin:  "+origin+"\n";
        if (cal.getInvertY())
            s += "Inverted y coordinates\n";

        Overlay overlay = imp.getOverlay();
        if (overlay!=null) {
            String hidden = imp.getHideOverlay()?" (hidden)":" ";
            int n = overlay.size();
            String elements = n==1?" element":" elements";
            s += "Overlay: " + n + elements + (imp.getHideOverlay()?" (hidden)":"") + "\n";
        } else
            s += "No overlay\n";

        Interpreter interp = Interpreter.getInstance();
        if (interp!=null)
            s += "Macro is running"+(Interpreter.isBatchMode()?" in batch mode":"")+"\n";

        Roi roi = imp.getRoi();
        if (roi == null) {
            if (cal.calibrated())
                s += " \n";
            s += "No selection\n";
        } else if (roi instanceof EllipseRoi) {
            s += "\nElliptical selection\n";
            double[] p = ((EllipseRoi)roi).getParams();
            double dx = p[2] - p[0];
            double dy = p[3] - p[1];
            double major = Math.sqrt(dx*dx+dy*dy);
            s += "  Major: " + IJ.d2s(major,2) + "\n";
            s += "  Minor: " + IJ.d2s(major*p[4],2) + "\n";
            s += "  X1: " + IJ.d2s(p[0],2) + "\n";
            s += "  Y1: " + IJ.d2s(p[1],2) + "\n";
            s += "  X2: " + IJ.d2s(p[2],2) + "\n";
            s += "  Y2: " + IJ.d2s(p[3],2) + "\n";
            s += "  Aspect ratio: " + IJ.d2s(p[4],2) + "\n";
        } else {
            s += " \n";
            s += roi.getTypeAsString()+" Selection";
            String points = null;
            if (roi instanceof PointRoi) {
                int npoints = ((PolygonRoi)roi).getNCoordinates();
                String suffix = npoints>1?"s)":")";
                points = " (" + npoints + " point" + suffix;
            }
            String name = roi.getName();
            if (name!=null) {
                s += " (\"" + name + "\")";
                if (points!=null) s += "\n " + points;      
            } else if (points!=null)
                s += points;
            s += "\n";      
            Rectangle r = roi.getBounds();
            if (roi instanceof Line) {
                Line line = (Line)roi;
                s += "  X1: " + IJ.d2s(line.x1d*cal.pixelWidth) + "\n";
                s += "  Y1: " + IJ.d2s(yy(line.y1d,imp)*cal.pixelHeight) + "\n";
                s += "  X2: " + IJ.d2s(line.x2d*cal.pixelWidth) + "\n";
                s += "  Y2: " + IJ.d2s(yy(line.y2d,imp)*cal.pixelHeight) + "\n";
            } else if (cal.scaled()) {
                s += "  X: " + IJ.d2s(cal.getX(r.x)) + " (" + r.x + ")\n";
                s += "  Y: " + IJ.d2s(cal.getY(r.y,imp.getHeight())) + " (" +  r.y + ")\n";
                s += "  Width: " + IJ.d2s(r.width*cal.pixelWidth) + " (" +  r.width + ")\n";
                s += "  Height: " + IJ.d2s(r.height*cal.pixelHeight) + " (" +  r.height + ")\n";
            } else {
                s += "  X: " + r.x + "\n";
                s += "  Y: " + yy(r.y,imp) + "\n";
                s += "  Width: " + r.width + "\n";
                s += "  Height: " + r.height + "\n";
            }
        }
        
        return s;
    }
    
    private String displayRanges(ImagePlus imp) {
        LUT[] luts = imp.getLuts();
        if (luts==null)
            return "";
        String s = "Display ranges\n";
        int n = luts.length;
        if (n>7) n=7;
        for (int i=0; i<n; i++) {
            double min = luts[i].min;
            double max = luts[i].max;
            s += "  " + (i+1) + ": " + d2s(min) + "-" + d2s(max) + "\n";
        }
        return s;
    }
    
    // returns a Y coordinate based on the "Invert Y Coodinates" flag
    private int yy(int y, ImagePlus imp) {
        return Analyzer.updateY(y, imp.getHeight());
    }

    // returns a Y coordinate based on the "Invert Y Coodinates" flag
    private double yy(double y, ImagePlus imp) {
        return Analyzer.updateY(y, imp.getHeight());
    }

    private void showInfo(ImagePlus imp, String info, int width, int height) {
        new TextWindow("Info for "+imp.getTitle(), info, width, height);
        //Editor ed = new Editor();
        //ed.setSize(width, height);
        //ed.create("Info for "+imp.getTitle(), info);
    }
    
    private String d2s(double n) {
        return IJ.d2s(n,Tools.getDecimalPlaces(n));
    }

}