/**
    * This file Copyright (c) 2003-2011 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.util;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.HierarchyManager;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.core.Path;
  import info.magnolia.cms.core.Content.ContentFilter;
  import info.magnolia.cms.security.AccessDeniedException;
  import info.magnolia.context.MgnlContext;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Comparator;
  import java.util.Iterator;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.jcr.ImportUUIDBehavior;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Some easy to use methods to handle with Content objects.
   */
  public class ContentUtil {
      private final static Logger log = LoggerFactory.getLogger(ContentUtil.class);
  
      /**
       * Content filter accepting everything.
       */
      public static ContentFilter ALL_NODES_CONTENT_FILTER = new ContentFilter() {
  
          public boolean accept(Content content) {
              return true;
          }
      };
  
      /**
       * Content filter accepting everything exept nodes with namespace jcr (version and system store).
       */
      public static ContentFilter ALL_NODES_EXCEPT_JCR_CONTENT_FILTER = new ContentFilter() {
  
          public boolean accept(Content content) {
              return !content.getName().startsWith("jcr:");
          }
      };
  
      /**
       * Content filter accepting everything except meta data and jcr types.
       */
      public static ContentFilter EXCLUDE_META_DATA_CONTENT_FILTER = new ContentFilter() {
          public boolean accept(Content content) {
              return !content.getName().startsWith("jcr:") && !content.isNodeType(ItemType.NT_METADATA);
          }
     };
 
     /**
      * Content filter accepting all nodes with a nodetype of namespace mgnl.
      */
     public static ContentFilter MAGNOLIA_FILTER = new ContentFilter() {
         public boolean accept(Content content) {
 
             try {
                 String nodetype = content.getNodeType().getName();
                 // export only "magnolia" nodes
                 return nodetype.startsWith("mgnl:");
             }
             catch (RepositoryException e) {
                 log.error("Unable to read nodetype for node {}", content.getHandle());
             }
             return false;
         }
     };
 
     /**
      * Used in {@link #visit(Content)} to visit the hierarchy.
      * @version $Id: ContentUtil.java 41137 2011-01-06 18:19:25Z gjoseph $
      */
     // TODO : throws RepositoryException or none, but not Exception !?
     public static interface Visitor {
         void visit(Content node) throws Exception;
     }
 
     /**
      * Used in {@link #visit(Content)} if the visitor wants to use post order.
      */
     public static interface PostVisitor extends Visitor {
         void postVisit(Content node) throws Exception;
     }
 
 
     /**
      * Returns a Content object of the named repository or null if not existing.
      * @return null if not found
      */
     public static Content getContent(String repository, String path) {
         try {
             return MgnlContext.getHierarchyManager(repository).getContent(path);
         }
         catch (RepositoryException e) {
             return null;
         }
     }
 
     /**
      * @return null if not found
      */
     public static Content getContentByUUID(String repository, String uuid) {
         try {
             return MgnlContext.getHierarchyManager(repository).getContentByUUID(uuid);
         }
         catch (RepositoryException e) {
             return null;
         }
     }
 
 
     /**
      * Get the node or null if not exists.
      * @param node
      * @param name
      * @return the sub node
      */
     public static Content getContent(Content node, String name) {
         try {
             return node.getContent(name);
         }
         catch (RepositoryException e) {
             return null;
         }
     }
 
     /**
      * If the node doesn't exist just create it. Attention the method does not save the newly created node.
      */
     public static Content getOrCreateContent(Content node, String name, ItemType contentType) throws AccessDeniedException, RepositoryException{
         return getOrCreateContent(node, name, contentType, false);
     }
 
     /**
      * If the node doesn't exist just create it. If the parameter save is true the parent node is saved.
      */
     public static Content getOrCreateContent(Content node, String name, ItemType contentType, boolean save)
         throws AccessDeniedException, RepositoryException {
         Content res = null;
         try {
             res = node.getContent(name);
         }
         catch (PathNotFoundException e) {
             res = node.createContent(name, contentType);
             if(save){
                 res.getParent().save();
             }
         }
         return res;
     }
 
     /**
      * Get a subnode case insensitive.
      * @param node
      * @param name
      * @return
      */
     public static Content getCaseInsensitive(Content node, String name) {
         if (name == null || node == null) {
             return null;
         }
         name = name.toLowerCase();
         for (Content child : node.getChildren(ALL_NODES_CONTENT_FILTER)) {
             if (child.getName().toLowerCase().equals(name)) {
                 return child;
             }
         }
         return null;
     }
 
     /**
      * Get all children recursively (content and contentnode).
      */
     public static List<Content> collectAllChildren(Content node) {
         List<Content> nodes = new ArrayList<Content>();
         return collectAllChildren(nodes, node, new ItemType[]{ItemType.CONTENT, ItemType.CONTENTNODE});
     }
 
     /**
      * Get all children using a filter.
      * @param node
      * @param filter
      * @return list of all found nodes
      */
     public static List<Content> collectAllChildren(Content node, ContentFilter filter) {
         List<Content> nodes = new ArrayList<Content>();
         return collectAllChildren(nodes, node, filter);
     }
 
     /**
      * Get the children using a filter.
      * @param nodes collection of already found nodes
      */
     private static List<Content> collectAllChildren(List<Content> nodes, Content node, ContentFilter filter) {
         // get filtered sub nodes first
         Collection<Content> children = node.getChildren(filter);
         for (Content child : children) {
             nodes.add(child);
         }
 
         // get all children to find recursively
         Collection<Content> allChildren = node.getChildren(EXCLUDE_META_DATA_CONTENT_FILTER);
 
         // recursion
         for (Content child : allChildren) {
             collectAllChildren(nodes, child, filter);
         }
 
         return nodes;
     }
 
     /**
      * Get all children of a particular type.
      */
     public static List<Content> collectAllChildren(Content node, ItemType type) {
         List<Content> nodes = new ArrayList<Content>();
         return collectAllChildren(nodes, node, new ItemType[]{type});
     }
 
     /**
      * Returns all children (not recursively) independent of there type.
      */
     public static Collection<Content> getAllChildren(Content node){
         return node.getChildren(EXCLUDE_META_DATA_CONTENT_FILTER);
     }
 
     /**
      * Returns all children (not recursively) independent of there type.
      */
     public static Collection<Content> getAllChildren(Content node, Comparator<Content> comp){
         return node.getChildren(EXCLUDE_META_DATA_CONTENT_FILTER, comp);
     }
 
     /**
      * Get all children of a particular type.
      */
     public static List<Content> collectAllChildren(Content node, ItemType[] types) {
         List<Content> nodes = new ArrayList<Content>();
         return collectAllChildren(nodes, node, types);
     }
 
     /**
      * Get all subnodes recursively and add them to the nodes collection.
      */
     private static List<Content> collectAllChildren(List<Content> nodes, Content node, ItemType[] types) {
         for (int i = 0; i < types.length; i++) {
             ItemType type = types[i];
 
             Collection<Content> children = node.getChildren(type);
             for (Content child : children) {
                 nodes.add(child);
                 collectAllChildren(nodes, child, types);
             }
         }
         return nodes;
     }
 
     /**
      * Convenient method to order a node before a target node.
      */
     public static void orderBefore(Content nodeToMove, String targetNodeName) throws RepositoryException{
         nodeToMove.getParent().orderBefore(nodeToMove.getName(), targetNodeName);
     }
 
     /**
      * Convenient method for ordering a node after a specific target node. This is not that simple as jcr only supports ordering before a node.
      */
     public static void orderAfter(Content nodeToMove, String targetNodeName) throws RepositoryException{
         Content parent = nodeToMove.getParent();
         Boolean readyToMove = false;
 
         Collection<Content> children = new ArrayList<Content>(ContentUtil.getAllChildren(parent));
         for (Content child : children) {
             if(readyToMove){
                 parent.orderBefore(nodeToMove.getName(), child.getName());
                 readyToMove = false;
                 break;
             }
 
             if(child.getName().equals(targetNodeName)){
                 readyToMove = true;
             }
         }
 
         if(readyToMove){
             for (Content child : children){
                 if(!nodeToMove.getName().equals(child.getName())){
                     parent.orderBefore(child.getName(), nodeToMove.getName());
                 }
             }
         }
     }
 
     public static void orderNodes(Content node, String[] nodes) throws RepositoryException{
         for (int i = nodes.length - 1; i > 0; i--) {
             node.orderBefore(nodes[i-1], nodes[i]);
         }
     }
 
     /**
      * Uses the passed comparator to create the jcr ordering of the children.
      */
     public static void orderNodes(Content node, Comparator<Content> comparator) throws RepositoryException {
         Collection<Content> children = ContentUtil.getAllChildren(node, comparator);
         String[] names = new String[children.size()];
 
         int i = 0;
         for (Content childNode : children) {
             names[i] = childNode.getName();
             i++;
         }
         orderNodes(node, names);
     }
 
     public static void visit(Content node, Visitor visitor) throws Exception{
         visit(node, visitor, EXCLUDE_META_DATA_CONTENT_FILTER);
     }
 
     public static void visit(Content node, Visitor visitor, ContentFilter filter) throws Exception{
         visitor.visit(node);
         for (Content content : node.getChildren(filter)) {
             visit(content, visitor, filter);
         }
         if(visitor instanceof PostVisitor){
             ((PostVisitor)visitor).postVisit(node);
         }
     }
 
     public static Content createPath(HierarchyManager hm, String path) throws AccessDeniedException,
         PathNotFoundException, RepositoryException {
         return createPath(hm, path, false);
     }
 
     public static Content createPath(HierarchyManager hm, String path, boolean save) throws AccessDeniedException,
         PathNotFoundException, RepositoryException {
         return createPath(hm, path, ItemType.CONTENT, save);
     }
 
     public static Content createPath(HierarchyManager hm, String path, ItemType type) throws AccessDeniedException,
         PathNotFoundException, RepositoryException {
         return createPath(hm, path, type, false);
     }
 
     public static Content createPath(HierarchyManager hm, String path, ItemType type, boolean save) throws AccessDeniedException,
         PathNotFoundException, RepositoryException {
         Content root = hm.getRoot();
         return createPath(root, path, type, save);
     }
 
     public static Content createPath(Content parent, String path, ItemType type) throws RepositoryException,
         PathNotFoundException, AccessDeniedException {
         return createPath(parent, path, type, false);
     }
 
     public static Content createPath(Content parent, String path, ItemType type, boolean save) throws RepositoryException,
         PathNotFoundException, AccessDeniedException {
         // remove leading /
         path = StringUtils.removeStart(path, "/");
 
         if (StringUtils.isEmpty(path)) {
             return parent;
         }
 
         String[] names = path.split("/"); //$NON-NLS-1$
 
         for (int i = 0; i < names.length; i++) {
             String name = names[i];
             if (parent.hasContent(name)) {
                 parent = parent.getContent(name);
             }
             else {
                 final Content newNode = parent.createContent(name, type);
                 if(save){
                     parent.save();
                 }
                 parent = newNode;
             }
         }
         return parent;
     }
 
     public static String uuid2path(String repository, String uuid){
         if(StringUtils.isNotEmpty(uuid)){
             HierarchyManager hm = MgnlContext.getHierarchyManager(repository);
             try {
                 Content node = hm.getContentByUUID(uuid);
                 return node.getHandle();
             }
             catch (Exception e) {
                 // return the uuid
             }
 
         }
         return uuid;
     }
 
     public static String path2uuid(String repository, String path) {
         if(StringUtils.isNotEmpty(path)){
             HierarchyManager hm = MgnlContext.getHierarchyManager(repository);
             try {
                 Content node = hm.getContent(path);
                 return node.getUUID();
             }
             catch (Exception e) {
                 // return the uuid
             }
 
         }
         return path;
     }
 
     public static void deleteAndRemoveEmptyParents(Content node) throws PathNotFoundException, RepositoryException,
     AccessDeniedException {
         deleteAndRemoveEmptyParents(node, 0);
     }
 
     public static void deleteAndRemoveEmptyParents(Content node, int level) throws PathNotFoundException, RepositoryException,
         AccessDeniedException {
         Content parent = null;
         if(node.getLevel() != 0){
              parent = node.getParent();
         }
         node.delete();
         if(parent != null && parent.getLevel()>level && parent.getChildren(ContentUtil.EXCLUDE_META_DATA_CONTENT_FILTER).size()==0){
             deleteAndRemoveEmptyParents(parent, level);
         }
     }
 
     /**
      * Session based copy operation. As JCR only supports workspace based copies this operation is performed
      * by using export import operations.
      */
     public static void copyInSession(Content src, String dest) throws RepositoryException {
         final String destParentPath = StringUtils.defaultIfEmpty(StringUtils.substringBeforeLast(dest, "/"), "/");
         final String destNodeName = StringUtils.substringAfterLast(dest, "/");
         final Session session = src.getWorkspace().getSession();
         try{
             final File file = File.createTempFile("mgnl", null, Path.getTempDirectory());
             final FileOutputStream outStream = new FileOutputStream(file);
             session.exportSystemView(src.getHandle(), outStream, false, false);
             outStream.flush();
             IOUtils.closeQuietly(outStream);
             FileInputStream inStream = new FileInputStream(file);
             session.importXML(
                 destParentPath,
                 inStream,
                 ImportUUIDBehavior.IMPORT_UUID_CREATE_NEW);
             IOUtils.closeQuietly(inStream);
             file.delete();
             if(!StringUtils.equals(src.getName(), destNodeName)){
                 String currentPath;
                 if(destParentPath.equals("/")){
                     currentPath = "/" + src.getName();
                 }
                 else{
                     currentPath = destParentPath + "/" + src.getName();
                 }
                 session.move(currentPath, dest);
             }
         }
         catch (IOException e) {
             throw new RepositoryException("Can't copy node " + src + " to " + dest, e);
         }
     }
 
     /**
      * Magnolia uses by default workspace move operation to move nodes. This is a util method to move a node inside a session.
      */
     public static void moveInSession(Content src, String dest) throws RepositoryException {
         src.getWorkspace().getSession().move(src.getHandle(), dest);
     }
 
     public static void rename(Content node, String newName) throws RepositoryException{
         Content parent = node.getParent();
         String placedBefore = null;
         for (Iterator<Content> iter = parent.getChildren(node.getNodeTypeName()).iterator(); iter.hasNext();) {
             Content child = iter.next();
             if (child.getUUID().equals(node.getUUID())) {
                 if (iter.hasNext()) {
                     child = iter.next();
                     placedBefore = child.getName();
                 }
             }
         }
 
         moveInSession(node, PathUtil.createPath(node.getParent().getHandle(), newName));
 
         // now set at the same place as before
         if (placedBefore != null) {
             parent.orderBefore(newName, placedBefore);
             parent.save();
         }
     }
 
     /**
      * Utility method to change the <code>jcr:primaryType</code> value of a node.
      * @param node - {@link Content} the node whose type has to be changed
      * @param newType - {@link ItemType} the new node type to be assigned
      * @param replaceAll - boolean when <code>true</code> replaces all occurrences
      * of the old node type. When <code>false</code> replaces only the first occurrence.
      * @throws RepositoryException
      */
     public static void changeNodeType(Content node, ItemType newType, boolean replaceAll) throws RepositoryException{
         if(node == null){
             throw new IllegalArgumentException("Content can't be null");
         }
         if(newType == null){
             throw new IllegalArgumentException("ItemType can't be null");
         }
         final String oldTypeName = node.getNodeTypeName();
         final String newTypeName = newType.getSystemName();
         if(newTypeName.equals(oldTypeName)){
             log.info("Old node type and new one are the same {}. Nothing to change.", newTypeName);
             return;
         }
         final Pattern nodeTypePattern = Pattern.compile("(<sv:property\\s+sv:name=\"jcr:primaryType\"\\s+sv:type=\"Name\"><sv:value>)("+oldTypeName+")(</sv:value>)");
         final String replacement = "$1"+newTypeName+"$3";
 
         log.debug("pattern is {}", nodeTypePattern.pattern());
         log.debug("replacement string is {}", replacement);
         log.debug("replaceAll? {}", replaceAll);
 
         final String destParentPath = StringUtils.defaultIfEmpty(StringUtils.substringBeforeLast(node.getHandle(), "/"), "/");
         final Session session = node.getWorkspace().getSession();
         FileOutputStream outStream = null;
         FileInputStream inStream = null;
         File file = null;
 
         try {
             file = File.createTempFile("mgnl", null, Path.getTempDirectory());
             outStream = new FileOutputStream(file);
             session.exportSystemView(node.getHandle(), outStream, false, false);
             outStream.flush();
             final String fileContents = FileUtils.readFileToString(file);
             log.debug("content string is {}", fileContents);
             final Matcher matcher = nodeTypePattern.matcher(fileContents);
             String replaced = null;
 
             log.debug("starting find&replace...");
             long start = System.currentTimeMillis();
             if(matcher.find()) {
                 log.debug("{} will be replaced", node.getHandle());
                 if(replaceAll){
                     replaced = matcher.replaceAll(replacement);
                 } else {
                     replaced = matcher.replaceFirst(replacement);
                 }
                 log.debug("replaced string is {}", replaced);
             } else {
                 log.debug("{} won't be replaced", node.getHandle());
                 return;
             }
             log.debug("find&replace operations took {}ms" + (System.currentTimeMillis() - start) / 1000);
 
             FileUtils.writeStringToFile(file, replaced);
             inStream = new FileInputStream(file);
             session.importXML(
                 destParentPath,
                 inStream,
                 ImportUUIDBehavior.IMPORT_UUID_COLLISION_REPLACE_EXISTING);
 
         } catch (IOException e) {
             throw new RepositoryException("Can't replace node " + node.getHandle(), e);
         } finally {
             IOUtils.closeQuietly(outStream);
             IOUtils.closeQuietly(inStream);
             FileUtils.deleteQuietly(file);
         }
     }
 }