/*
 * 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 2009 Sun Microsystems, Inc.
 * Portions Copyright 2014-2016 ForgeRock AS.
 */
package org.opends.guitools.controlpanel.ui;

import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.swing.Box;
import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.JTextComponent;

import org.forgerock.opendj.ldap.Attribute;
import org.forgerock.opendj.ldap.responses.SearchResultEntry;
import org.opends.guitools.controlpanel.datamodel.BasicMonitoringAttributes;
import org.opends.guitools.controlpanel.datamodel.ServerDescriptor;
import org.opends.guitools.controlpanel.ui.components.BasicExpander;
import org.opends.guitools.controlpanel.util.Utilities;
import org.opends.server.util.CollectionUtils;

import static org.opends.messages.AdminToolMessages.*;
import static org.opends.server.util.ServerConstants.*;

/** The panel displaying the java monitoring information. */
public class JavaInformationMonitoringPanel extends GeneralMonitoringPanel
{
  private static final long serialVersionUID = 9031734563799969830L;

  private final List<BasicMonitoringAttributes> generalAttributes = CollectionUtils.newArrayList(
      BasicMonitoringAttributes.JVM_VERSION,
      BasicMonitoringAttributes.JVM_VENDOR,
      BasicMonitoringAttributes.JVM_ARCHITECTURE,
      BasicMonitoringAttributes.JVM_ARGUMENTS,
      BasicMonitoringAttributes.CLASS_PATH,
      BasicMonitoringAttributes.JAVA_VERSION,
      BasicMonitoringAttributes.JAVA_VENDOR);
  private final List<BasicMonitoringAttributes> extraAttributes = CollectionUtils.newArrayList(
      BasicMonitoringAttributes.CLASS_PATH,
      BasicMonitoringAttributes.JAVA_VERSION,
      BasicMonitoringAttributes.JAVA_VENDOR);
  private final List<JComponent> generalMonitoringComps = new ArrayList<>();
  {
    for (int i=0; i<generalAttributes.size(); i++)
    {
      if (generalAttributes.get(i) == BasicMonitoringAttributes.CLASS_PATH ||
          generalAttributes.get(i) == BasicMonitoringAttributes.JVM_ARGUMENTS)
      {
        JEditorPane pane = new JEditorPane();
        pane.setEditable(false);
        pane.setBorder(new EmptyBorder(0, 0, 0, 0));
        pane.setOpaque(false);
        pane.setFocusCycleRoot(false);
        generalMonitoringComps.add(pane);
      }
      else
      {
        generalMonitoringComps.add(Utilities.createDefaultLabel());
      }
    }
  }

  private final List<String> memoryAttributes = new ArrayList<>();
  private final List<JLabel> memoryLabels = new ArrayList<>();
  private JPanel memoryPanel;

  /** Default constructor. */
  public JavaInformationMonitoringPanel()
  {
    super();
    createLayout();
  }

  @Override
  public Component getPreferredFocusComponent()
  {
    return generalMonitoringComps.get(0);
  }

  /** Creates the layout of the panel (but the contents are not populated here). */
  private void createLayout()
  {
    GridBagConstraints gbc = new GridBagConstraints();
    JLabel lTitle = Utilities.createTitleLabel(
        INFO_CTRL_PANEL_JAVA_INFORMATION.get());
    gbc.fill = GridBagConstraints.NONE;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.gridwidth = 2;
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.insets.top = 5;
    gbc.insets.bottom = 7;
    add(lTitle, gbc);

    gbc.insets.bottom = 0;
    gbc.insets.top = 10;
    gbc.gridy ++;
    gbc.anchor = GridBagConstraints.WEST;
    gbc.gridwidth = 1;
    for (int i=0; i<generalAttributes.size(); i++)
    {
      if (extraAttributes.contains(generalAttributes.get(i)))
      {
        continue;
      }
      JLabel l = Utilities.createPrimaryLabel(
          getLabel(generalAttributes.get(i)));
      gbc.gridy ++;
      gbc.insets.left = 0;
      gbc.insets.right = 0;
      gbc.gridx = 0;
      gbc.weightx = 0.0;
      gbc.gridwidth = 1;
      gbc.fill = GridBagConstraints.NONE;
      boolean isTextComponent =
        generalMonitoringComps.get(i) instanceof JTextComponent;
      if (isTextComponent)
      {
        gbc.anchor = GridBagConstraints.NORTHWEST;
      }
      else
      {
        gbc.anchor = GridBagConstraints.WEST;
      }
      add(l, gbc);
      gbc.insets.left = 10;
      gbc.gridx = 1;
      if (isTextComponent)
      {
        gbc.insets.right = 10;
        gbc.weightx = 1.0;
        gbc.fill = GridBagConstraints.BOTH;
      }
      else
      {
        gbc.weightx = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
      }
      add(generalMonitoringComps.get(i), gbc);
    }

    final BasicExpander extraExpander = new BasicExpander(
        INFO_CTRL_PANEL_EXTRA_JAVA_ATTRIBUTES.get());
    gbc.gridwidth = 2;
    gbc.gridx = 0;
    gbc.weighty = 0.0;
    gbc.insets.left = 0;
    gbc.weightx = 1.0;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.gridy ++;
    add(extraExpander, gbc);
    final JPanel extraGeneralPanel = new JPanel(new GridBagLayout());
    gbc.insets.left = 15;
    gbc.gridy ++;
    add(extraGeneralPanel, gbc);
    extraGeneralPanel.setOpaque(false);
    extraGeneralPanel.setVisible(false);

    final BasicExpander memoryExpander = new BasicExpander(
        INFO_CTRL_PANEL_JAVA_MEMORY_ATTRIBUTES.get());
    gbc.gridy ++;
    gbc.insets.left = 0;
    add(memoryExpander, gbc);
    memoryPanel = new JPanel(new GridBagLayout());
    gbc.insets.left = 15;
    gbc.gridy ++;
    add(memoryPanel, gbc);
    memoryPanel.setOpaque(false);
    memoryPanel.setVisible(false);

    GridBagConstraints gbc1 = new GridBagConstraints();
    gbc1.fill = GridBagConstraints.HORIZONTAL;
    gbc1.gridy = 0;
    gbc1.gridx = 0;
    gbc1.gridwidth = 1;

    for (int i=0; i<extraAttributes.size(); i++)
    {
      int index = generalAttributes.indexOf(extraAttributes.get(i));
      JLabel l = Utilities.createPrimaryLabel(
          getLabel(extraAttributes.get(i)));
      gbc1.insets.left = 0;
      gbc1.insets.right = 0;
      gbc1.gridx = 0;
      gbc1.weightx = 0.0;
      gbc1.gridwidth = 1;
      gbc1.fill = GridBagConstraints.NONE;
      boolean isTextComponent =
        generalMonitoringComps.get(index) instanceof JTextComponent;
      if (isTextComponent)
      {
        gbc1.anchor = GridBagConstraints.NORTHWEST;
      }
      else
      {
        gbc1.anchor = GridBagConstraints.WEST;
      }
      extraGeneralPanel.add(l, gbc1);
      gbc1.insets.left = 10;
      gbc1.gridx = 1;
      if (isTextComponent)
      {
        gbc1.insets.right = 10;
        gbc1.weightx = 1.0;
        gbc1.fill = GridBagConstraints.BOTH;
      }
      else
      {
        gbc1.weightx = 1.0;
        gbc1.fill = GridBagConstraints.HORIZONTAL;
      }
      extraGeneralPanel.add(generalMonitoringComps.get(index), gbc1);
      gbc1.insets.top = 10;
      gbc1.gridy ++;
    }
    ChangeListener changeListener = new ChangeListener()
    {
      @Override
      public void stateChanged(ChangeEvent e)
      {
        extraGeneralPanel.setVisible(extraExpander.isSelected());
      }
    };
    extraExpander.addChangeListener(changeListener);

    changeListener = new ChangeListener()
    {
      @Override
      public void stateChanged(ChangeEvent e)
      {
        memoryPanel.setVisible(memoryExpander.isSelected());
      }
    };
    memoryExpander.addChangeListener(changeListener);

    gbc.gridx = 0;
    gbc.gridy ++;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.weightx = 1.0;
    gbc.weighty = 1.0;
    gbc.gridwidth = 2;
    add(Box.createGlue(), gbc);

    setBorder(PANEL_BORDER);
  }

  @Override
  public void updateContents()
  {
    ServerDescriptor server = null;
    if (getInfo() != null)
    {
      server = getInfo().getServerDescriptor();
    }
    SearchResultEntry csrSystem = null;
    SearchResultEntry csrMemory = null;
    if (server != null)
    {
      csrSystem = server.getSystemInformationMonitor();
      csrMemory = server.getJvmMemoryUsageMonitor();
    }
    if (csrSystem != null)
    {
      for (int i=0 ; i<generalAttributes.size(); i++)
      {
        String value =
          getMonitoringValue(generalAttributes.get(i), csrSystem);
        JComponent l = generalMonitoringComps.get(i);
        if (l instanceof JLabel)
        {
          ((JLabel)l).setText(value);
        }
        else if (l instanceof JTextComponent)
        {
          ((JTextComponent)l).setText(value);
        }
        else
        {
          throw new RuntimeException("Unexpected component: "+l);
        }
      }
    }
    else
    {
      for (JComponent l : generalMonitoringComps)
      {
        if (l instanceof JLabel)
        {
          ((JLabel)l).setText(NO_VALUE_SET.toString());
        }
        else if (l instanceof JTextComponent)
        {
          ((JTextComponent)l).setText(NO_VALUE_SET.toString());
        }
        else
        {
          throw new RuntimeException("Unexpected component: "+l);
        }
      }
    }
    if (csrMemory != null)
    {
      if (memoryAttributes.isEmpty())
      {
        SortedSet<String> sortedNames = new TreeSet<>();
        for (Attribute attribute : csrMemory.getAllAttributes())
        {
          String attrName = attribute.getAttributeDescriptionAsString();
          if (!OBJECTCLASS_ATTRIBUTE_TYPE_NAME.equalsIgnoreCase(attrName)
              && !ATTR_COMMON_NAME.equalsIgnoreCase(attrName))
          {
            sortedNames.add(attrName);
          }
        }
        memoryAttributes.addAll(sortedNames);

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.WEST;
        gbc.gridwidth = 1;

        for (String attrName : memoryAttributes)
        {
          JLabel l = Utilities.createPrimaryLabel(
              INFO_CTRL_PANEL_OPERATION_NAME_AS_LABEL.get(attrName));
          gbc.insets.left = 0;
          gbc.insets.right = 0;
          gbc.gridx = 0;
          gbc.weightx = 0.0;
          gbc.fill = GridBagConstraints.NONE;
          memoryPanel.add(l, gbc);
          gbc.insets.left = 10;
          gbc.gridx = 1;
          gbc.weightx = 1.0;
          gbc.fill = GridBagConstraints.HORIZONTAL;
          JLabel valueLabel = Utilities.createDefaultLabel();
          memoryLabels.add(valueLabel);
          memoryPanel.add(valueLabel, gbc);
          gbc.gridy ++;
          gbc.insets.top = 10;
        }
      }

      for (int i=0; i<memoryAttributes.size() ; i++)
      {
        String value = csrMemory.getAttribute(memoryAttributes.get(i)).firstValueAsString();
        if (value != null)
        {
          memoryLabels.get(i).setText(value);
        }
        else
        {
          memoryLabels.get(i).setText(NO_VALUE_SET.toString());
        }
      }
    }
    else
    {
      for (JLabel l : memoryLabels)
      {
        l.setText(NO_VALUE_SET.toString());
      }
    }
  }
}