/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.google.security.zynamics.zylib.gui;

import com.google.security.zynamics.zylib.general.Pair;

import java.awt.Component;
import java.awt.Frame;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JOptionPane;


/**
 * Class that can be used to show simple message windows to the user, implemented as a simple
 * wrapper around <code>JOptionPane</code>. <br/>
 * By default, this class uses a system property with the key
 * <code>com.google.security.zynamics.zylib.gui.CMessageBox.DEFAULT_WINDOW_TITLE</code> as the title of the message
 * dialog box.
 */
public final class CMessageBox {
  public static final String DEFAULT_WINDOW_TITLE_PROPERTY = CMessageBox.class.getCanonicalName()
      + ".DEFAULT_WINDOW_TITLE";

  /**
   * You are not supposed to instantiate this class.
   */
  private CMessageBox() {
  }

  /**
   * Checks whether a <code>Component</code> is iconified. Always returns <code>false</code> on
   * <code>Component</code>s that are not descendants of <code>Frame</code>.
   * 
   * @param c the <code>Component</code> to check
   * @return <code>true</code> if <code>c</code> is non-null and a descendant of <code>Frame</code>
   *         and <code>c</code> is currently iconified, <code>false</code> otherwise.
   */
  private static boolean isIconified(final Component c) {
    if ((c != null) && (c instanceof Frame)) {
      return (((Frame) c).getExtendedState() & Frame.ICONIFIED) != 0;
    }
    return false;
  }

  public static int showCustomQuestionMessageBox(final Component parent, final String description,
      final String title, final JButton[] buttons, final JButton defaultButton) {
    return JOptionPane.showOptionDialog(parent, description, title, JOptionPane.DEFAULT_OPTION,
        JOptionPane.QUESTION_MESSAGE, null, buttons, defaultButton);
  }

  /**
   * Shows an error message.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   */
  public static void showError(final Component parent, final String msg) {
    JOptionPane.showMessageDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.ERROR_MESSAGE);
  }

  /**
   * Shows an informational message.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   */
  public static void showInformation(final Component parent, final String msg) {
    JOptionPane.showMessageDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.INFORMATION_MESSAGE);
  }

  /**
   * Shows a warning message.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   */
  public static void showWarning(final Component parent, final String msg) {
    JOptionPane.showMessageDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.WARNING_MESSAGE);
  }

  /**
   * Shows a question the user can answer with Yes/No/Cancel.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   * 
   * @return An integer indicating the option selected by the user.
   */
  public static int showYesNoCancelQuestion(final Component parent, final String msg) {
    return JOptionPane.showConfirmDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.YES_NO_CANCEL_OPTION,
        JOptionPane.QUESTION_MESSAGE);
  }

  /**
   * Shows an error message with a question the user can answer with Yes/No.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   * 
   * @return An integer indicating the option selected by the user.
   */
  public static int showYesNoError(final Component parent, final String msg) {
    return JOptionPane.showConfirmDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.YES_NO_OPTION,
        JOptionPane.ERROR_MESSAGE);
  }

  /**
   * Shows a question the user can answer with Yes/No.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   * 
   * @return An integer indicating the option selected by the user.
   */
  public static int showYesNoQuestion(final Component parent, final String msg) {
    return showYesNoQuestionWithCheckbox(parent, msg, null).first();
  }

  /**
   * Shows a question the user can answer with Yes/No with an additional checkbox below.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   * @param checkBoxTitle Title shown in the checkbox. If <code>null</code>, no checkbox is shown.
   * 
   * @return A <code>Pair</code>, where the first field indicates the button selected by the user
   *         and the second field indicates the selection state of the checkbox.
   */
  public static Pair<Integer, Boolean> showYesNoQuestionWithCheckbox(final Component parent,
      final String msg, final String checkBoxTitle) {
    JCheckBox checkbox = null;
    Object params;
    if (checkBoxTitle != null) {
      checkbox = new JCheckBox(checkBoxTitle);
      params = new Object[] {msg, checkbox};
    } else {
      params = msg;
    }

    final int option =
        JOptionPane.showConfirmDialog(isIconified(parent) ? null : parent, params,
            System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.YES_NO_OPTION,
            JOptionPane.QUESTION_MESSAGE);
    return Pair.make(option, checkBoxTitle != null ? checkbox.isSelected() : false);
  }

  /**
   * Shows an warning message with a question the user can answer with Yes/No.
   * 
   * @param parent Parent window of the message box.
   * @param msg Message shown in the message box.
   * 
   * @return An integer indicating the option selected by the user.
   */
  public static int showYesNoWarning(final Component parent, final String msg) {
    return JOptionPane.showConfirmDialog(isIconified(parent) ? null : parent, msg,
        System.getProperty(DEFAULT_WINDOW_TITLE_PROPERTY), JOptionPane.YES_NO_OPTION,
        JOptionPane.WARNING_MESSAGE);
  }


}
