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
			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))
				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))
							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)) {
			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;
	}
		
}