/**
    * This file Copyright (c) 2003-2010 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.security;
  
  import info.magnolia.cms.beans.config.ContentRepository;
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.HierarchyManager;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.core.NodeData;
  import info.magnolia.cms.core.Path;
  import info.magnolia.cms.util.NodeDataUtil;
  import info.magnolia.cms.util.SystemContentWrapper;
  
  import org.apache.commons.codec.binary.Base64;
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.lang.exception.ExceptionUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.jcr.ItemNotFoundException;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.PropertyType;
  import javax.jcr.RepositoryException;
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.GregorianCalendar;
  import java.util.Set;
  import java.util.TreeSet;
  
  
  /**
   * This class wraps a user content object.
   * @version $Revision: 36890 $ ($Author: pbaerfuss $)
   */
  public class MgnlUser extends AbstractUser implements Serializable {
  
      private static final long serialVersionUID = 222L;
  
      private static final Logger log = LoggerFactory.getLogger(MgnlUser.class);
  
      /**
       * Under this subnodes the assigned roles are saved.
       */
      private static final String NODE_ROLES = "roles"; //$NON-NLS-1$
  
      private static final String NODE_GROUPS = "groups"; //$NON-NLS-1$
  
      /**
       * Used to to synchronize write operations in {@link MgnlUser#setLastAccess().
       */
      private static final Object mutex = new Object();
  
      // serialized
      private final SystemContentWrapper userNode;
  
      /**
       * @param userNode the Content object representing this user
       */
      protected MgnlUser(Content userNode) {
          this.userNode = new SystemContentWrapper(userNode);
      }
  
      /**
       * Is this user in a specified role?
       * @param groupName the name of the role
       * @return true if in role
       */
      public boolean inGroup(String groupName) {
         return this.hasAny(groupName, NODE_GROUPS);
     }
 
     /**
      * Remove a group. Implementation is optional
      * @param groupName
      */
     public void removeGroup(String groupName) throws UnsupportedOperationException {
         this.remove(groupName, NODE_GROUPS);
     }
 
     /**
      * Adds this user to a group. Implementation is optional
      * @param groupName
      */
     public void addGroup(String groupName) throws UnsupportedOperationException {
         this.add(groupName, NODE_GROUPS);
     }
 
     public boolean isEnabled() {
         return NodeDataUtil.getBoolean(getUserNode(), "enabled", true);
     }
 
     public void setEnabled(boolean enabled) {
         try {
             NodeDataUtil.getOrCreateAndSet(getUserNode(), "enabled", enabled);
             getUserNode().save();
         } catch (RepositoryException e) {
             throw new RuntimeException(e); // TODO
         }
     }
 
     /**
      * Is this user in a specified role?
      * @param roleName the name of the role
      * @return true if in role
      */
     public boolean hasRole(String roleName) {
         return this.hasAny(roleName, NODE_ROLES);
     }
 
     public void removeRole(String roleName) {
         this.remove(roleName, NODE_ROLES);
     }
 
     public void addRole(String roleName) {
         this.add(roleName, NODE_ROLES);
     }
 
     // TODO this are the same methods as in {@link MgnlGroup}. A rewrite is needed.
 
     private boolean hasAny(String name, String nodeName) {
         try {
             HierarchyManager hm;
             if (StringUtils.equalsIgnoreCase(nodeName, NODE_ROLES)) {
                 hm = MgnlSecurityUtil.getSystemHierarchyManager(ContentRepository.USER_ROLES);
             }
             else {
                 hm = MgnlSecurityUtil.getSystemHierarchyManager(ContentRepository.USER_GROUPS);
             }
 
             Content node = this.getUserNode().getContent(nodeName);
             for (NodeData nodeData : node.getNodeDataCollection()) {
                 // check for the existence of this ID
                 try {
                     if (hm.getContentByUUID(nodeData.getString()).getName().equalsIgnoreCase(name)) {
                         return true;
                     }
                 }
                 catch (ItemNotFoundException e) {
                     log.debug("Role [{}] does not exist in the ROLES repository", name);
                 }
                 catch (IllegalArgumentException e) {
                     log.debug("{} has invalid value", nodeData.getHandle());
                 }
             }
         }
         catch (RepositoryException e) {
             log.debug(e.getMessage(), e);
         }
         return false;
     }
 
     private void remove(String name, String nodeName) {
         try {
             HierarchyManager hm;
             if (StringUtils.equalsIgnoreCase(nodeName, NODE_ROLES)) {
                 hm = MgnlSecurityUtil.getContextHierarchyManager(ContentRepository.USER_ROLES);
             }
             else {
                 hm = MgnlSecurityUtil.getContextHierarchyManager(ContentRepository.USER_GROUPS);
             }
             Content node = this.getUserNode().getContent(nodeName);
 
             for (NodeData nodeData : node.getNodeDataCollection()) {
                 // check for the existence of this ID
                 try {
                     if (hm.getContentByUUID(nodeData.getString()).getName().equalsIgnoreCase(name)) {
                         nodeData.delete();
                     }
                 }
                 catch (ItemNotFoundException e) {
                     log.debug("Role [{}] does not exist in the ROLES repository", name);
                 }
                 catch (IllegalArgumentException e) {
                     log.debug("{} has invalid value", nodeData.getHandle());
                 }
             }
             this.getUserNode().save();
         }
         catch (RepositoryException e) {
             log.error("failed to remove " + name + " from user [" + this.getName() + "]", e);
         }
     }
 
     private void add(String name, String nodeName) {
         try {
             final String hmName;
             if (StringUtils.equalsIgnoreCase(nodeName, NODE_ROLES)) {
                 hmName = ContentRepository.USER_ROLES;
             }
             else {
                 hmName = ContentRepository.USER_GROUPS;
             }
             final HierarchyManager hm = MgnlSecurityUtil.getContextHierarchyManager(hmName);
 
             if (!this.hasAny(name, nodeName)) {
                if (!this.getUserNode().hasContent(nodeName)) {
                     this.getUserNode().createContent(nodeName, ItemType.CONTENTNODE);
                }
                 Content node = this.getUserNode().getContent(nodeName);
                 // add corresponding ID
                 try {
                     String value = hm.getContent("/" + name).getUUID(); // assuming that there is a flat hierarchy
                     // used only to get the unique label
                     HierarchyManager usersHM = MgnlSecurityUtil.getSystemHierarchyManager(ContentRepository.USERS);
                     String newName = Path.getUniqueLabel(usersHM, node.getHandle(), "0");
                     node.createNodeData(newName).setValue(value);
                     this.getUserNode().save();
                 }
                 catch (PathNotFoundException e) {
                     log.debug("[{}] does not exist in the {} repository", name, hmName);
                 }
             }
         }
         catch (RepositoryException e) {
             log.error("failed to add " + name + " to user [" + this.getName() + "]", e);
         }
     }
 
     public String getName() {
         return this.getUserNode().getName();
     }
 
     public String getPassword() {
         final String encodedPassword = this.getUserNode().getNodeData("pswd").getString().trim();
         return decodePassword(encodedPassword);
     }
 
     protected String decodePassword(String encodedPassword) {
         return new String(Base64.decodeBase64(encodedPassword.getBytes()));
     }
 
     public String getLanguage() {
         return this.getUserNode().getNodeData("language").getString(); //$NON-NLS-1$
     }
 
     public String getProperty(String propertyName) {
         return NodeDataUtil.getString(getUserNode(), propertyName, null);
     }
 
     public void setProperty(String propertyName, String value) {
         try {
             NodeDataUtil.getOrCreateAndSet(getUserNode(), propertyName, value);
             getUserNode().save();
         } catch (RepositoryException e) {
             throw new RuntimeException(e); // TODO
         }
     }
 
     public Collection<String> getGroups() {
         return MgnlSecurityUtil.collectPropertyNames(getUserNode(), "groups", ContentRepository.USER_GROUPS, false);
     }
 
     public Collection<String> getAllGroups() {
         final Set<String> allGroups = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
         try {
             // add the user's direct groups
             final Collection<String> groups = getGroups();
             allGroups.addAll(groups);
 
             // add all groups from direct groups
             final GroupManager gm = SecuritySupport.Factory.getInstance().getGroupManager();
             for (String groupName : groups) {
                 final Group g = gm.getGroup(groupName);
                 allGroups.addAll(g.getAllGroups());
             }
 
             return allGroups;
         } catch (AccessDeniedException e) {
             throw new RuntimeException(e); // TODO
         }
     }
 
     public Collection<String> getRoles() {
         return MgnlSecurityUtil.collectPropertyNames(getUserNode(), "roles", ContentRepository.USER_ROLES, false);
     }
 
     public Collection<String> getAllRoles() {
         final Set<String> allRoles = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
         try {
             // add the user's direct roles
             allRoles.addAll(getRoles());
 
             // add roles from all groups
             final GroupManager gm = SecuritySupport.Factory.getInstance().getGroupManager();
             final Collection<String> allGroups = getAllGroups();
             for (String groupName : allGroups) {
                 final Group g = gm.getGroup(groupName);
                 allRoles.addAll(g.getRoles());
             }
 
             return allRoles;
         } catch (AccessDeniedException e) {
             throw new RuntimeException(e); // TODO
         }
     }
 
     /**
      * Update the "last access" timestamp.
      */
     public void setLastAccess() {
         NodeData lastaccess;
         Exception finalException = null;
         boolean success = false;
         // try three times to save the lastaccess property
         for(int i= 1; !success && i <=3; i++){
             finalException = null;
             try {
                 // synchronize on a static mutex
                 synchronized (mutex) {
                     // refresh the session on retries
                     if(i>1){
                         getUserNode().refresh(false);
                     }
                     lastaccess = NodeDataUtil.getOrCreate(this.getUserNode(), "lastaccess", PropertyType.DATE);
                     lastaccess.setValue(new GregorianCalendar());
                     getUserNode().save();
                     success = true;
                 }
             }
             catch (RepositoryException e) {
                 finalException = e;
                 log.debug("Unable to set the last access", e);
             }
         }
         if(finalException != null){
             log.warn("Unable to set the last access date due to a " + ExceptionUtils.getMessage(finalException));
         }
     }
 
     public Content getUserNode() {
         return userNode;
     }
 }