package org.codemap.util;

//Send questions, comments, bug reports, etc. to the authors:

//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)

import java.io.File;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;

/**
 * This class provides a facade for the "save" FileDialog class. If the selected
 * file already exists, the user is asked to confirm before overwriting.
 */
public class SafeSaveDialog {
    // The wrapped FileDialog
    private FileDialog dlg;
    private IFileNameCallback callback;

    /**
     * SafeSaveDialog constructor
     * 
     * @param shell
     *            the parent shell
     */
    public SafeSaveDialog(Shell shell) {
        dlg = new FileDialog(shell, SWT.SAVE);
    }
    
    public SafeSaveDialog(Shell shell, IFileNameCallback cb) {
        this(shell);
        callback = cb;
    }    

    public String open() {
        // We store the selected file name in fileName
        String fileName = null;

        // The user has finished when one of the
        // following happens:
        // 1) The user dismisses the dialog by pressing Cancel
        // 2) The selected file name does not exist
        // 3) The user agrees to overwrite existing file
        boolean done = false;

        while (!done) {
            // Open the File Dialog
            fileName = dlg.open();
            if (fileName == null) {
                // User has cancelled, so quit and return
                done = true;
            } else {
                // User has selected a file; see if it already exists
                if (callback != null) {
                    fileName = callback.checkFileName(fileName);
                    String[] split = fileName.split(File.separator);
                    setFileName(split[split.length-1]);
                }
                File file = new File(fileName);
                if (file.exists()) {
                    // The file already exists; asks for confirmation
                    MessageBox mb = new MessageBox(dlg.getParent(),
                            SWT.ICON_WARNING
                                    | SWT.YES | SWT.NO);

                    // We really should read this string from a
                    // resource bundle
                    mb.setMessage(fileName
                            + " already exists. Do you want to replace it?");

                    // If they click Yes, we're done and we drop out. If
                    // they click No, we redisplay the File Dialog
                    done = mb.open() == SWT.YES;
                } else {
                    // File does not exist, so drop out
                    done = true;
                }
            }
        }
        return fileName;
    }

    public String getFileName() {
        return dlg.getFileName();
    }

    public String[] getFileNames() {
        return dlg.getFileNames();
    }

    public String[] getFilterExtensions() {
        return dlg.getFilterExtensions();
    }

    public String[] getFilterNames() {
        return dlg.getFilterNames();
    }

    public String getFilterPath() {
        return dlg.getFilterPath();
    }

    public void setFileName(String string) {
        dlg.setFileName(string);
    }

    public void setFilterExtensions(String[] extensions) {
        dlg.setFilterExtensions(extensions);
    }

    public void setFilterNames(String[] names) {
        dlg.setFilterNames(names);
    }

    public void setFilterPath(String string) {
        dlg.setFilterPath(string);
    }

    public Shell getParent() {
        return dlg.getParent();
    }

    public int getStyle() {
        return dlg.getStyle();
    }

    public String getText() {
        return dlg.getText();
    }

    public void setText(String string) {
        dlg.setText(string);
    }
}