/*
 * 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 2008-2010 Sun Microsystems, Inc.
 * Portions Copyright 2013-2016 ForgeRock AS.
 */

package org.opends.guitools.controlpanel.task;

import static org.opends.messages.AdminToolMessages.*;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.DirContext;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.swing.SwingUtilities;

import org.opends.admin.ads.util.ConnectionUtils;
import org.opends.guitools.controlpanel.browser.BrowserController;
import org.opends.guitools.controlpanel.datamodel.BackendDescriptor;
import org.opends.guitools.controlpanel.datamodel.BaseDNDescriptor;
import org.opends.guitools.controlpanel.datamodel.ControlPanelInfo;
import org.opends.guitools.controlpanel.ui.ColorAndFontConstants;
import org.opends.guitools.controlpanel.ui.ProgressDialog;
import org.opends.guitools.controlpanel.util.Utilities;
import org.opends.messages.AdminToolMessages;
import org.forgerock.i18n.LocalizableMessage;
import org.forgerock.opendj.ldap.DN;
import org.opends.server.util.ServerConstants;

/**
 * The class that is in charge of adding a set of entries to a set of static
 * groups.
 */
public class AddToGroupTask extends Task
{
  private Set<String> backendSet;
  private LinkedHashSet<DN> dns = new LinkedHashSet<>();
  private LinkedHashSet<DN> groupDns = new LinkedHashSet<>();

  /**
   * Constructor of the task.
   * @param info the control panel information.
   * @param dlg the progress dialog where the task progress will be displayed.
   * @param dns the DNs of the entries we want to add to the groups.
   * @param groupDns the groups that we want to modify.
   */
  public AddToGroupTask(ControlPanelInfo info, ProgressDialog dlg,
      Set<DN> dns, Set<DN> groupDns)
  {
    super(info, dlg);
    backendSet = new HashSet<>();
    this.dns.addAll(dns);
    this.groupDns.addAll(groupDns);
    for (DN groupDn : groupDns)
    {
      for (BackendDescriptor backend :
        info.getServerDescriptor().getBackends())
      {
        for (BaseDNDescriptor baseDN : backend.getBaseDns())
        {
          if (groupDn.isSubordinateOrEqualTo(baseDN.getDn()))
          {
            backendSet.add(backend.getBackendID());
          }
        }
      }
    }
  }

  /** {@inheritDoc} */
  public Type getType()
  {
    return Type.MODIFY_ENTRY;
  }

  /** {@inheritDoc} */
  public Set<String> getBackends()
  {
    return backendSet;
  }

  /** {@inheritDoc} */
  public LocalizableMessage getTaskDescription()
  {
    return AdminToolMessages.INFO_CTRL_PANEL_ADD_TO_GROUP_TASK_DESCRIPTION.get();
  }

  /** {@inheritDoc} */
  protected String getCommandLinePath()
  {
    return null;
  }

  /** {@inheritDoc} */
  protected ArrayList<String> getCommandLineArguments()
  {
    return new ArrayList<>();
  }

  /** {@inheritDoc} */
  public boolean canLaunch(Task taskToBeLaunched,
      Collection<LocalizableMessage> incompatibilityReasons)
  {
    if (!isServerRunning()
        && state == State.RUNNING
        && runningOnSameServer(taskToBeLaunched))
    {
      // All the operations are incompatible if they apply to this
      // backend for safety.  This is a short operation so the limitation
      // has not a lot of impact.
      Set<String> backends = new TreeSet<>(taskToBeLaunched.getBackends());
      backends.retainAll(getBackends());
      if (!backends.isEmpty())
      {
        incompatibilityReasons.add(getIncompatibilityMessage(this, taskToBeLaunched));
        return false;
      }
    }
    return true;
  }

  /** {@inheritDoc} */
  public boolean regenerateDescriptor()
  {
    return false;
  }

  /** {@inheritDoc} */
  public void runTask()
  {
    state = State.RUNNING;
    lastException = null;

    try
    {
      for (final DN groupDn : groupDns)
      {
        final Collection<ModificationItem> modifications =
          getModifications(groupDn, dns);
        if (!modifications.isEmpty())
        {
          ModificationItem[] mods =
          new ModificationItem[modifications.size()];
          modifications.toArray(mods);

          SwingUtilities.invokeLater(new Runnable()
          {
            public void run()
            {
              printEquivalentCommandToModify(groupDn, modifications, false);
              getProgressDialog().appendProgressHtml(
                  Utilities.getProgressWithPoints(
                      INFO_CTRL_PANEL_ADDING_TO_GROUP.get(groupDn),
                      ColorAndFontConstants.progressFont));
            }
          });

          getInfo().getDirContext().modifyAttributes(
              Utilities.getJNDIName(groupDn.toString()), mods);

          SwingUtilities.invokeLater(new Runnable()
          {
            public void run()
            {
              getProgressDialog().appendProgressHtml(
                  Utilities.getProgressDone(
                      ColorAndFontConstants.progressFont));
            }
          });
        }
      }
      state = State.FINISHED_SUCCESSFULLY;
    }
    catch (Throwable t)
    {
      lastException = t;
      state = State.FINISHED_WITH_ERROR;
    }
  }

  /**
   * Returns the modifications that must be made to the provided group.
   * @param groupDn the DN of the static group that must be updated.
   * @param dns the list of entry DNs that must be added to the group.
   * @return the list of modifications (in form of ModificationItem) that
   *  must be made to the provided group.
   * @throws NamingException if an error occurs.
   */
  private Collection<ModificationItem> getModifications(DN groupDn,
  Set<DN> dns) throws NamingException
  {
    ArrayList<ModificationItem> modifications = new ArrayList<>();

    // Search for the group entry
    SearchControls ctls = new SearchControls();
    ctls.setSearchScope(SearchControls.OBJECT_SCOPE);
    ctls.setReturningAttributes(
        new String[] {
            ServerConstants.OBJECTCLASS_ATTRIBUTE_TYPE_NAME,
            ServerConstants.ATTR_MEMBER,
            ServerConstants.ATTR_UNIQUE_MEMBER
        });
    String filter = BrowserController.ALL_OBJECTS_FILTER;
    NamingEnumeration<SearchResult> result =
      getInfo().getDirContext().search(
          Utilities.getJNDIName(groupDn.toString()),
          filter, ctls);

    try
    {
      String memberAttr = ServerConstants.ATTR_MEMBER;
      while (result.hasMore())
      {
        SearchResult sr = result.next();
        Set<String> objectClasses =
          ConnectionUtils.getValues(sr, ServerConstants
            .OBJECTCLASS_ATTRIBUTE_TYPE_NAME);
        if (objectClasses.contains(ServerConstants.OC_GROUP_OF_UNIQUE_NAMES))
        {
          memberAttr = ServerConstants.ATTR_UNIQUE_MEMBER;
        }
        Set<String> values = ConnectionUtils.getValues(sr, memberAttr);
        Set<String> dnsToAdd = new LinkedHashSet<>();
        if (values != null)
        {
          for (DN newDn : dns)
          {
            boolean found = false;
            for (String dn : values)
            {
              if (Utilities.areDnsEqual(dn, newDn.toString()))
              {
                found = true;
                break;
              }
            }
            if (!found)
            {
              dnsToAdd.add(newDn.toString());
            }
          }
        }
        else
        {
          for (DN newDn : dns)
          {
            dnsToAdd.add(newDn.toString());
          }
        }
        if (!dnsToAdd.isEmpty())
        {
          Attribute attribute = new BasicAttribute(memberAttr);
          for (String dn : dnsToAdd)
          {
            attribute.add(dn);
          }
          modifications.add(new ModificationItem(
              DirContext.ADD_ATTRIBUTE,
              attribute));
        }
      }
    }
    finally
    {
      result.close();
    }
    return modifications;
  }
}