//
// DataConverter.java
//

/*
VisAD system for interactive analysis and visualization of numerical
data.  Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/

package visad.util;

import visad.*;
import visad.data.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.reflect.*;
import java.util.Vector;
import javax.swing.*;

/**
 * DataConverter provides a simple GUI for converting data
 * between VisAD-supported formats, using the data form of choice.
 */
public class DataConverter {

  // -- CONSTANTS --

  protected static final ExtensionFileFilter FILTER =
    new ExtensionFileFilter("class", "Java classes");


  // -- FIELDS --

  protected Vector forms;
  protected DataImpl data;
  protected File lastDir;

  protected JFrame frame;
  protected JTextArea area;
  protected JScrollPane scroll;
  protected JButton read, write;


  // -- CONSTRUCTORS --

  public DataConverter() { this(new File("../data"), "visad"); }

  public DataConverter(File dir, String prefix) {
    forms = new Vector();
    findForms(dir, prefix);
    doGUI();
  }


  // -- HELPER METHODS --

  protected void doGUI() {
    frame = new JFrame("VisAD Data Converter");
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) { System.exit(0); }
    });
    JPanel pane = new JPanel();
    pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));
    frame.setContentPane(pane);

    area = new JTextArea("VisAD Data Converter\n\n");
    area.setEditable(false);
    scroll = new JScrollPane(area);
    pane.add(scroll);

    final JPopupMenu readMenu = new JPopupMenu();
    read = new JButton("Import");
    read.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        popup(read, readMenu);
      }
    });

    final JPopupMenu writeMenu = new JPopupMenu();
    write = new JButton("Export");
    write.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        popup(write, writeMenu);
      }
    });

    for (int i=0; i 0) xpos = 0;
    if (ypos > 0) ypos = 0;
    menu.show(button, b.width + xpos, ypos);
  }

  protected void importData(FormNode form) {
    final FormNode loader = form;
    final File file = doDialog(form, false);
    if (file == null) return;
    Thread t = new Thread(new Runnable() {
      public void run() {
        setBusy(true);
        print("Importing " + file.getPath() + ": ");
        try {
          data = loader.open(file.getPath());
          if (data == null) println("Data is null");
          else {
            println("OK");
            println(data.getType().prettyString());
          }
        }
        catch (Throwable tt) {
          println("Error");
          println(tt);
        }
        setBusy(false);
      }
    });
    t.start();
  }

  protected void exportData(FormNode form) {
    final FormNode saver = form;
    final File file = doDialog(form, true);
    if (file == null) return;
    Thread t = new Thread(new Runnable() {
      public void run() {
        setBusy(true);
        print("Exporting " + file.getPath() + ": ");
        try {
          saver.save(file.getPath(), data, true);
          println("OK");
        }
        catch (Throwable tt) {
          println("Error");
          println(tt);
        }
        setBusy(false);
      }
    });
    t.start();
  }

  protected File doDialog(FormNode form, boolean save) {
    JFileChooser chooser = lastDir == null ?
      new JFileChooser() : new JFileChooser(lastDir);
    String[] suffixes = getSuffixes(form);
    if (suffixes != null) {
      chooser.setFileFilter(new ExtensionFileFilter(
        suffixes, form.getClass().getName()));
    }
    int retVal = save ? chooser.showSaveDialog(frame) :
      chooser.showOpenDialog(frame);
    lastDir = chooser.getCurrentDirectory();
    return retVal == JFileChooser.APPROVE_OPTION ?
      chooser.getSelectedFile() : null;
  }

  protected String[] getSuffixes(FormNode form) {
    if (!(form instanceof FormFileInformer)) return null;
    FormFileInformer ffi = (FormFileInformer) form;
    String[] suffixes = ffi.getDefaultSuffixes();
    return suffixes == null || suffixes.length == 0 ||
      suffixes[0].trim().equals("") ? null : suffixes;
  }

  protected void setBusy(boolean busy) {
    read.setEnabled(!busy);
    write.setEnabled(!busy);
    frame.setCursor(busy ? Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR) :
      Cursor.getDefaultCursor());
  }

  protected void print(String text) {
    area.append(text);
    JViewport view = scroll.getViewport();
    Dimension size = view.getViewSize();
    view.setViewPosition(new Point(0, size.height));
  }

  protected void println(String text) { print(text + "\n\n"); }
  protected void println() { print("\n\n"); }
  protected void println(Throwable t) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    t.printStackTrace(pw);
    pw.close();
    print(sw.toString() + "\n\n");
  }

  protected void findForms(File f, String prefix) {
    if (f.isDirectory()) {
      File[] list = f.listFiles(FILTER);
      String name = f.getName();
      String pre = "".equals(prefix) ? name : prefix + "." + name;
      for (int i=0; i