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Scripting steps for Pentaho kettle.
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/*
 * Ruby for pentaho kettle
 * Copyright (C) 2017 Twineworks GmbH
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.twineworks.kettle.ruby.step;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.pentaho.di.i18n.BaseMessages;

import java.util.List;

public class RubyStepRenameDialog extends Dialog {

  private static Class PKG = RubyStepMeta.class; // for i18n purposes
  Shell shell;
  Text text;
  String newName;
  List namesTaken;
  boolean nameOk;

  public RubyStepRenameDialog(Shell parent) {
    super(parent);
  }

  public RubyStepRenameDialog(Shell parent, int style) {
    super(parent, style);
  }

  private void cancel() {
    newName = null;
    shell.dispose();
  }

  private void ok() {
    newName = text.getText();
    shell.dispose();
  }

  public String open(String preset, List takenNames) {

    namesTaken = takenNames;

    Shell parent = getParent();
    shell = new Shell(parent, SWT.TITLE | SWT.BORDER | SWT.APPLICATION_MODAL);

    shell.setText(BaseMessages.getString(PKG, "RubyStepDialog.RenameScript", preset));
    shell.setLayout(new GridLayout(2, true));

    text = new Text(shell, SWT.SINGLE | SWT.BORDER);

    GridData d = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.GRAB_HORIZONTAL);
    d.horizontalSpan = 2;
    text.setLayoutData(d);

    final Button buttonOK = new Button(shell, SWT.PUSH);
    buttonOK.setText(BaseMessages.getString(PKG, "System.Button.OK"));
    buttonOK.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
    Button buttonCancel = new Button(shell, SWT.PUSH);
    buttonCancel.setText(BaseMessages.getString(PKG, "System.Button.Cancel"));

    text.addListener(SWT.Modify, new Listener() {
      public void handleEvent(Event event) {

        nameOk = !namesTaken.contains(text.getText());
        buttonOK.setEnabled(nameOk);

      }
    });

    SelectionAdapter lsDef = new SelectionAdapter() {
      public void widgetDefaultSelected(SelectionEvent e) {
        if (nameOk) {
          ok();
        }
      }

    };

    text.addSelectionListener(lsDef);
    buttonOK.addSelectionListener(lsDef);

    buttonCancel.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        cancel();
      }
    });

    buttonOK.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        if (nameOk) {
          ok();
        }
      }
    });

    shell.addListener(SWT.Traverse, new Listener() {
      public void handleEvent(Event event) {
        if (event.detail == SWT.TRAVERSE_ESCAPE) {
          cancel();
        }
      }
    });

    // initially the name is fine
    nameOk = true;
    text.setText(preset);

    shell.setDefaultButton(buttonOK);

    Point size = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT);
    if (size.x < 220) {
      size.x = 220;
    }

    shell.pack();
    shell.layout();

    Point cursorPos = shell.getDisplay().getCursorLocation();
    cursorPos.x -= text.getLocation().x;
    cursorPos.y -= text.getLocation().y;
    shell.setLocation(cursorPos);
    shell.open();

    Display display = parent.getDisplay();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }

    return newName;
  }
}