/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions Copyright [year] [name of copyright owner]".
 *
 * Copyright 2006-2009 Sun Microsystems, Inc.
 * Portions Copyright 2013-2015 ForgeRock AS.
 */

package org.opends.quicksetup.ui;

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.HashSet;
import org.forgerock.i18n.LocalizableMessage;
import org.forgerock.i18n.slf4j.LocalizedLogger;


import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

import org.opends.quicksetup.*;
import org.opends.quicksetup.event.ButtonActionListener;
import org.opends.quicksetup.event.ButtonEvent;
import org.opends.quicksetup.event.MinimumSizeComponentListener;
import org.opends.quicksetup.ProgressDescriptor;
/**
 * This class represents the dialog used by quicksetup applications.
 *
 * In its constructor it gets as parameters an object describing the current
 * installation status and the default values to be proposed to the user
 * in the panels.
 *
 * If we are installing Open DS and the server has already been installed it
 * will display an error message.  In the other cases it will display a wizard.
 *
 */
public class QuickSetupDialog
{
  private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();

  private JFrame frame;
  private QuickSetupErrorPanel installedPanel;
  private JPanel framePanel;
  private StepsPanel stepsPanel;
  private CurrentStepPanel currentStepPanel;
  private ButtonsPanel buttonsPanel;

  private WizardStep displayedStep;

  private CurrentInstallStatus installStatus;

  private HashSet<ButtonActionListener> buttonListeners = new HashSet<>();

  private GuiApplication application;

  private QuickSetup quickSetup;

  private boolean forceToDisplay;

  /**
   * Constructor of QuickSetupDialog.
   * @param app Application to run in as a wizard
   * @param installStatus of the current environment
   * @param qs QuickSetup acting as controller
   */
  public QuickSetupDialog(GuiApplication app,
      CurrentInstallStatus installStatus,
      QuickSetup qs)
  {
    if (app == null) {
      throw new IllegalArgumentException("application cannot be null");
    }
    this.application = app;
    this.installStatus = installStatus;
    this.quickSetup = qs;
    frame = new JFrame(String.valueOf(application.getFrameTitle()));
    frame.getContentPane().add(getFramePanel());
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        application.windowClosing(QuickSetupDialog.this, e);
      }
    });
    frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
    Utilities.setFrameIcon(frame);
  }

  /**
   * Packs and displays this dialog.
   *
   */
  public void packAndShow()
  {
    frame.pack();
    int minWidth = (int) frame.getPreferredSize().getWidth();
    int minHeight = (int) frame.getPreferredSize().getHeight();
    Utilities.centerOnScreen(frame);
    setFocusOnButton(application.getInitialFocusButtonName());
    frame.addComponentListener(new MinimumSizeComponentListener(frame,
        minWidth, minHeight));

    frame.setVisible(true);
  }

  /**
   * This method is called when we detected that there is something installed
   * we inform of this to the user and the user wants to proceed with the
   * installation destroying the contents of the data and the configuration
   * in the current installation.
   */
  public void forceToDisplay()
  {
    this.forceToDisplay = true;
    framePanel = null;
    frame.getContentPane().removeAll();
    frame.getContentPane().add(getFramePanel());
    frame.pack();
    Utilities.centerOnScreen(frame);
    setFocusOnButton(ButtonName.NEXT);
  }

  /**
   * Displays the panel corresponding to the provided step.  The panel contents
   * are updated with the contents of the UserData object.
   * @param step the step that we want to display.
   * @param userData the UserData object that must be used to populate
   * the panels.
   */
  public void setDisplayedStep(WizardStep step, UserData userData)
  {
    displayedStep = step;
    //  First call the panels to do the required updates on their layout
    getButtonsPanel().updateButtons(step);
    getStepsPanel().setDisplayedStep(step, userData);
    getCurrentStepPanel().setDisplayedStep(step, userData);
  }

  /**
   * Returns the currently displayed step.
   * @return the currently displayed step.
   */
  public WizardStep getDisplayedStep()
  {
    return displayedStep;
  }

  /**
   * Forwards to the displayed panel the ProgressDescriptor so that they
   * can update their contents accordingly.
   * @param descriptor the descriptor of the Installation progress.
   */
  public void displayProgress(ProgressDescriptor descriptor)
  {
    getCurrentStepPanel().displayProgress(descriptor);
    ProgressStep status = descriptor.getProgressStep();
    if (status.isLast()) {
      setButtonEnabled(ButtonName.CLOSE, true);
    }
  }

  /**
   * Displays an error message dialog.
   *
   * @param msg
   *          the error message.
   * @param title
   *          the title for the dialog.
   */
  public void displayError(LocalizableMessage msg, LocalizableMessage title)
  {
    Utilities.displayError(getFrame(), msg, title);
  }

  /**
   * Displays a confirmation message dialog.
   *
   * @param msg
   *          the confirmation message.
   * @param title
   *          the title of the dialog.
   * @return <CODE>true</CODE> if the user confirms the message, or
   * <CODE>false</CODE> if not.
   */
  public boolean displayConfirmation(LocalizableMessage msg, LocalizableMessage title)
  {
    return Utilities.displayConfirmation(getFrame(), msg, title);
  }

  /**
   * Returns the value corresponding to the provided FieldName.
   * @param fieldName the FieldName for which we want to obtain the value.
   * @return the value corresponding to the provided FieldName.
   */
  public Object getFieldValue(FieldName fieldName)
  {
    return getCurrentStepPanel().getFieldValue(fieldName);
  }

  /**
   * Marks as invalid (or valid depending on the value of the invalid parameter)
   * a field corresponding to FieldName.  This basically implies udpating the
   * style of the JLabel associated with fieldName (the association is done
   * using the LabelFieldDescriptor class).
   * @param fieldName the FieldName to be marked as valid or invalid.
   * @param invalid whether to mark the field as valid or invalid.
   */
  public void displayFieldInvalid(FieldName fieldName, boolean invalid)
  {
    getCurrentStepPanel().displayFieldInvalid(fieldName, invalid);
  }

  /**
   * Adds a button listener.  All the button listeners will be notified when
   * the buttons are clicked (by the user or programatically).
   * @param l the ButtonActionListener to be added.
   */
  public void addButtonActionListener(ButtonActionListener l)
  {
    getButtonsPanel().addButtonActionListener(l);
    getInstalledPanel().addButtonActionListener(l);
    getCurrentStepPanel().addButtonActionListener(l);

    buttonListeners.add(l);
  }

  /**
   * This method is called to inform that a worker has started (the QuickSetup
   * is doing some data validation).  The worker is doing its tasks outside
   * the event thread to avoid blocking of the painting and this class is
   * notified of this fact.  The method basically simply the Next and Previous
   * buttons.
   *
   * This method can be called from the event thread or outside the event
   * thread.
   *
   */
  public void workerStarted()
  {
    Runnable r = new Runnable()
    {
      public void run()
      {
        displayWorkingProgressImage(true);
        setButtonEnabled(ButtonName.NEXT, false);
        setButtonEnabled(ButtonName.PREVIOUS, false);
        setButtonEnabled(ButtonName.FINISH, false);
      }
    };
    runOnEventThread(r);
  }

  /**
   * This method is called to inform that a worker has finished. The method just
   * enables the Next and Previous buttons.
   *
   * This method can be called from the event thread or outside the event
   * thread.
   *
   */
  public void workerFinished()
  {
    Runnable r = new Runnable()
    {
      public void run()
      {
        displayWorkingProgressImage(false);
        setButtonEnabled(ButtonName.NEXT, true);
        setButtonEnabled(ButtonName.PREVIOUS, true);
        setButtonEnabled(ButtonName.FINISH, true);
      }
    };
    runOnEventThread(r);
  }

  /**
   * Notification telling that the installation/uninstallation is finished.
   * @param successful a boolean telling whether the setup was successful or
   * not.
   */
  public void finished(boolean successful)
  {
    setButtonEnabled(ButtonName.CLOSE, true);
    if (!successful)
    {
      // Do nothing... all the error messages
    }
  }

  /**
   * Returns the frame containing the dialog.
   * @return the frame containing the dialog.
   */
  public JFrame getFrame()
  {
    return frame;
  }

  /**
   * Enables a button associated with the given Button Name.
   * @param buttonName the button name of the button.
   * @param enable boolean indicating to enable or to disable the button.
   */
  public void setButtonEnabled(ButtonName buttonName, boolean enable)
  {
    getButton(buttonName).setEnabled(enable);
  }

  /**
   * Returns the panel of the dialog.
   * @return the panel of the dialog.
   */
  private JPanel getFramePanel()
  {
    if (framePanel == null) {
      framePanel = application.createFramePanel(this);
    }
    return framePanel;
  }

  /**
   * Returns the steps panel.
   * @return the steps panel.
   */
  public StepsPanel getStepsPanel()
  {
    if (stepsPanel == null)
    {
      stepsPanel = new StepsPanel(application);
      stepsPanel.setQuickSetup(quickSetup);
    }
    return stepsPanel;
  }

  /**
   * Returns the current step panel.
   * @return the current step panel.
   */
  public CurrentStepPanel getCurrentStepPanel()
  {
    if (currentStepPanel == null)
    {
      currentStepPanel = new CurrentStepPanel(application, quickSetup);
    }
    return currentStepPanel;
  }


  /**
   * Returns the buttons panel.
   * @return the buttons panel.
   */
  public ButtonsPanel getButtonsPanel()
  {
    if (buttonsPanel == null)
    {
      buttonsPanel = new ButtonsPanel(application);
      buttonsPanel.setQuickSetup(quickSetup);
    }
    return buttonsPanel;
  }

  /**
   * Returns the button corresponding to the buttonName.
   * @param buttonName the ButtonName for which we want to get the button.
   * @return the button corresponding to the buttonName.
   */
  private JButton getButton(ButtonName buttonName)
  {
    JButton button;
    if (isInstalled() && !forceToDisplay)
    {
      if (buttonName == ButtonName.QUIT)
      {
        button = getInstalledPanel().getQuitButton();
      } else if (buttonName == ButtonName.CONTINUE_INSTALL)
      {
        button = getInstalledPanel().getContinueInstallButton();
      } else
      {
        button = getButtonsPanel().getButton(buttonName);
      }
    } else
    {
      button = getButtonsPanel().getButton(buttonName);
    }
    return button;
  }

  /**
   * Sets the focus in the button associated with the ButtonName.
   * @param buttonName the ButtonName associated with the button.
   */
  public void setFocusOnButton(ButtonName buttonName)
  {
    JButton button = getButton(buttonName);
    if (button != null) {
      button.requestFocusInWindow();
    } else {
      logger.info(LocalizableMessage.raw("Focus requested for unknown button '" +
              buttonName + "'"));
    }
  }

  /**
   * Sets the default button for the frame.
   * @param buttonName the ButtonName associated with the button.
   */
  public void setDefaultButton(ButtonName buttonName)
  {
    getFrame().getRootPane().setDefaultButton(getButton(buttonName));
  }

  /**
   * Method used to execute a Runnable in the event thread.  If we are in the
   * event thread it will be called synchronously and if we are not it will
   * be executed asynchronously.
   *
   * @param r the Runnable to be executed.
   */
  private void runOnEventThread(Runnable r)
  {
    if (SwingUtilities.isEventDispatchThread())
    {
      r.run();
    } else
    {
      SwingUtilities.invokeLater(r);
    }
  }

  /**
   * Returns <CODE>true</CODE> if the server is already installed and
   * <CODE>false</CODE> otherwise.
   * @return <CODE>true</CODE> if the server is already installed and
   * <CODE>false</CODE> otherwise.
   */
  private boolean isInstalled()
  {
    return installStatus.isInstalled();
  }

  /**
   * Returns (and creates if it is not already created) the panel that
   * informs the user that the server is already installed when the
   * installation has been launched.
   * @return the panel that is used
   * to inform the user that the server is already installed when the
   * installation has been launched.
   */
  public QuickSetupErrorPanel getInstalledPanel()
  {
    if (installedPanel == null)
    {
      installedPanel = new QuickSetupErrorPanel(
              application,
              installStatus);
      installedPanel.setQuickSetup(quickSetup);
    }
    return installedPanel;
  }

  /**
   * Notifies the ButtonActionListener objects that an ButtonEvent has occurred
   * in the button associated with buttonName.
   * @param buttonName the ButtonName associated with the button.
   */
  public void notifyButtonEvent(ButtonName buttonName)
  {
    ButtonEvent be = new ButtonEvent(this, buttonName);
    for (ButtonActionListener li : buttonListeners)
    {
      li.buttonActionPerformed(be);
    }
  }

  private void displayWorkingProgressImage(boolean display)
  {
    getCurrentStepPanel().setCheckingVisible(display);
  }
}