package ij.io;
import ij.gui.GenericDialog;
import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import ij.*;
import ij.plugin.frame.Recorder;
import ij.util.Java2;
import ij.macro.Interpreter;

/** This class displays a dialog window from 
    which the user can save a file. */ 
public class SaveDialog {

    private String dir;
    private String name;
    private String title;
    private String ext;
    
    /** Displays a file save dialog with 'title' as the 
        title, 'defaultName' as the initial file name, and
        'extension' (e.g. ".tif") as the default extension.
    */
    public SaveDialog(String title, String defaultName, String extension) {
        this.title = title;
        ext = extension;
        if (isMacro())
            return;
        String defaultDir = OpenDialog.getDefaultDirectory();
        defaultName = setExtension(defaultName, extension);
        if (Prefs.useJFileChooser)
            jSave(title, defaultDir, defaultName);
        else
            save(title, defaultDir, defaultName);
        if (name!=null && dir!=null)
            OpenDialog.setDefaultDirectory(dir);
        IJ.showStatus(title+": "+dir+name);
    }
    
    /** Displays a file save dialog, using the specified 
        default directory and file name and extension. */
    public SaveDialog(String title, String defaultDir, String defaultName, String extension) {
        this.title = title;
        ext = extension;
        if (isMacro())
            return;
        defaultName = setExtension(defaultName, extension);
        if (Prefs.useJFileChooser)
            jSave(title, defaultDir, defaultName);
        else
            save(title, defaultDir, defaultName);
        IJ.showStatus(title+": "+dir+name);
    }
    
    boolean isMacro() {
        String macroOptions = Macro.getOptions();
        if (macroOptions!=null) {
            String path = Macro.getValue(macroOptions, title, null);
            if (path==null)
                path = Macro.getValue(macroOptions, "path", null);
            if (path!=null && path.indexOf(".")==-1 && !((new File(path)).exists())) {
                // Is 'path' a macro variable?
                if (path.startsWith("&")) path=path.substring(1);
                Interpreter interp = Interpreter.getInstance();
                String path2 = interp!=null?interp.getStringVariable(path):null;
                if (path2!=null) path = path2;
            }
            if (path!=null) {
                Opener o = new Opener();
                dir = o.getDir(path);
                name = o.getName(path);
                return true;
            }
        }
        return false;
    }
    
    public static String setExtension(String name, String extension) {
        if (name==null || extension==null || extension.length()==0)
            return name;
        int dotIndex = name.lastIndexOf(".");
        if (dotIndex>=0 && (name.length()-dotIndex)<=5) {
            if (dotIndex+1<name.length() && Character.isDigit(name.charAt(dotIndex+1)))
                name += extension;
            else
                name = name.substring(0, dotIndex) + extension;
        } else if (!name.endsWith(extension))
            name += extension;
        return name;
    }
        
    // Save using JFileChooser.
    void jSave(String title, String defaultDir, String defaultName) {
        Java2.setSystemLookAndFeel();
        if (EventQueue.isDispatchThread())
            jSaveDispatchThread(title, defaultDir, defaultName);
        else
            jSaveInvokeAndWait(title, defaultDir, defaultName);
    }

    // Save using JFileChooser.
    // assumes we are running on the event dispatch thread
    void jSaveDispatchThread(String title, String defaultDir, String defaultName) {
        JFileChooser fc = new JFileChooser();
        fc.setDialogTitle(title);
        if (defaultDir!=null) {
            File f = new File(defaultDir);
            if (f!=null)
                fc.setCurrentDirectory(f);
        }
        if (defaultName!=null)
            fc.setSelectedFile(new File(defaultName));
        int returnVal = fc.showSaveDialog(IJ.getInstance());
        if (returnVal!=JFileChooser.APPROVE_OPTION)
            {Macro.abort(); return;}
        File f = fc.getSelectedFile();
        if(f.exists()) {
            int ret = JOptionPane.showConfirmDialog (fc,
                "The file "+ f.getName() + " already exists. \nWould you like to replace it?",
                "Replace?",
                JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
            if (ret!=JOptionPane.OK_OPTION) f = null;
        }
        if (f==null)
            Macro.abort();
        else {
            dir = fc.getCurrentDirectory().getPath()+File.separator;
            name = fc.getName(f);
            if (noExtension(name)) {
                if (".raw".equals(ext))
                    ext = null;
                name = setExtension(name, ext);
            }
        }
    }

    // Save using JFileChooser. Runs on event
    // dispatch thread to avoid thread deadlocks.
    void jSaveInvokeAndWait(final String title, final String defaultDir, final String defaultName) {
        try {
            EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    JFileChooser fc = new JFileChooser();
                    fc.setDialogTitle(title);
                    if (defaultDir!=null) {
                        File f = new File(defaultDir);
                        if (f!=null)
                            fc.setCurrentDirectory(f);
                    }
                    if (defaultName!=null)
                        fc.setSelectedFile(new File(defaultName));
                    int returnVal = fc.showSaveDialog(IJ.getInstance());
                    if (returnVal!=JFileChooser.APPROVE_OPTION)
                        {Macro.abort(); return;}
                    File f = fc.getSelectedFile();
                    if(f.exists()) {
                        int ret = JOptionPane.showConfirmDialog (fc,
                            "The file "+ f.getName() + " already exists. \nWould you like to replace it?",
                            "Replace?",
                            JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
                        if (ret!=JOptionPane.OK_OPTION) f = null;
                    }
                    if (f==null)
                        Macro.abort();
                    else {
                        dir = fc.getCurrentDirectory().getPath()+File.separator;
                        name = fc.getName(f);
                        if (noExtension(name)) {
                            if (".raw".equals(ext))
                                ext = null;
                            name = setExtension(name, ext);
                        }
                    }
                }
            });
        } catch (Exception e) {}
    }

    // Save using FileDialog
    void save(String title, String defaultDir, String defaultName) {
        ImageJ ij = IJ.getInstance();
        Frame parent = ij!=null?ij:new Frame();
        FileDialog fd = new FileDialog(parent, title, FileDialog.SAVE);
        if (defaultName!=null)
            fd.setFile(defaultName);
        if (defaultDir!=null)
            fd.setDirectory(defaultDir);
        fd.show();
        name = fd.getFile();
        String origName = name;
        if (noExtension(name)) {
            if (".raw".equals(ext))
                ext = null;
            name = setExtension(name, ext);
            boolean dialog = name!=null && !name.equals(origName) && IJ.isMacOSX() && !IJ.isMacro();
            if (dialog) {
                File f = new File( fd.getDirectory()+getFileName());
                if (!f.exists()) dialog = false;
            }
            if (dialog) {
                Font font = new Font("SansSerif", Font.BOLD, 12);
                GenericDialog gd = new GenericDialog("Replace File?");
                gd.addMessage("\""+name+"\" already exists.\nDo you want to replace it?", font);
                gd.addMessage("To avoid this dialog, enable"
                +"\n\"Show all filename extensions\"\nin Finder Preferences.");
                gd.setOKLabel("Replace");
                gd.showDialog();
                if (gd.wasCanceled())
                    name = null;
            }
        }
        if (IJ.debugMode) IJ.log(origName+"->"+name);
        dir = fd.getDirectory();
        if (name==null)
            Macro.abort();
        fd.dispose();
        if (ij==null)
            parent.dispose();
    }
    
    private boolean noExtension(String name) {
        if (name==null) return false;
        int dotIndex = name.indexOf(".");
        return dotIndex==-1 || (name.length()-dotIndex)>5;
    }
    
    /** Returns the selected directory. */
    public String getDirectory() {
        OpenDialog.setLastDirectory(dir);
        return dir;
    }
    
    /** Returns the selected file name. */
    public String getFileName() {
        if (name!=null) {
            if (Recorder.record && dir!=null)
                Recorder.recordPath(title, dir+name);
            OpenDialog.setLastName(name);
        }
        return name;
    }
        
}