/**
    * This file Copyright (c) 2003-2015 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.beans.config;
  
  import info.magnolia.context.MgnlContext;
  import info.magnolia.link.Link;
  import info.magnolia.link.LinkException;
  import info.magnolia.link.LinkUtil;
  
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Describes a uri to repository mapping.
   */
  public class URI2RepositoryMapping {
  
      private static Logger log = LoggerFactory.getLogger(URI2RepositoryMapping.class);
  
      /**
       * The prefix which triggers this mapping.
       */
      private String URIPrefix;
  
      /**
       * The repository used for this mapping.
       */
      private String repository;
  
      /**
       * The prefix added to the uri to create a full handle.
       */
      private String handlePrefix;
  
      public URI2RepositoryMapping(String uriPrefix, String repository, String handlePrefix) {
          this.URIPrefix = uriPrefix;
          this.repository = repository;
          this.handlePrefix = handlePrefix;
      }
  
      public URI2RepositoryMapping() {
      }
  
      /**
       * True if this mapping can get applied to the specified uri.
       */
      public boolean matches(String uri) {
          if (uri == null) {
              return false;
          }
          return uri.startsWith(URIPrefix);
      }
  
      /**
       * Create a node handle based on an uri.
       */
      public String getHandle(String uri) {
          String handle;
          handle = StringUtils.removeStart(uri, this.URIPrefix);
          if (StringUtils.isNotEmpty(this.handlePrefix)) {
              handle = StringUtils.removeStart(handle, "/");
              handle = this.handlePrefix + "/" + handle;
          }
         //remove extension (ignore . anywhere else in the uri)
         String fileName = StringUtils.substringAfterLast(handle, "/");
         String extension = StringUtils.substringAfterLast(fileName, ".");
         handle = StringUtils.removeEnd(handle, "." + extension);
         handle = cleanHandle(handle);
 
         try {
             final Session session = MgnlContext.getJCRSession(this.repository);
             if (!session.itemExists(handle)) {
                 String maybeHandle = (this.handlePrefix.endsWith("/") ? "/" : "") + StringUtils.removeStart(handle, this.handlePrefix);
                 // prefix might have been prepended incorrectly. Second part of the condition is there to match links to binary nodes
                 if (session.itemExists(maybeHandle) || (maybeHandle.lastIndexOf("/") > 0 && session.itemExists(StringUtils.substringBeforeLast(maybeHandle, "/")))) {
                     return maybeHandle;
                 }
             }
         } catch (RepositoryException e) {
             //Log the exception and return handle
             log.debug(e.getMessage(), e);
         }
         return handle;
     }
 
     /**
      * Clean a handle. Remove double / and add always a leading /.
      */
     protected String cleanHandle(String handle) {
         if (!handle.startsWith("/")) {
             handle = "/" + handle;
         }
         while (handle.indexOf("//") != -1) {
             handle = StringUtils.replace(handle, "//", "/");
         }
         return handle;
     }
 
     /**
      * Create a uri based on a handle.
      */
     public String getURI(String handle) {
         try {
             return getURI(LinkUtil.createLinkInstance(this.getRepository(), handle, null, null, null));
         } catch (LinkException e) {
             return handle;
         }
     }
 
     public String getURI(Link uuidLink) {
         String uri = uuidLink.getPath();
         if (StringUtils.isNotEmpty(this.handlePrefix)) {
             uri = StringUtils.removeStart(uri, this.handlePrefix);
         }
         if (StringUtils.isNotEmpty(this.URIPrefix)) {
             uri = this.URIPrefix + "/" + uri;
         }
 
         String nodeDataName = uuidLink.getNodeDataName();
         String fileName = uuidLink.getFileName();
         String extension = uuidLink.getExtension();
 
         if (StringUtils.isNotEmpty(nodeDataName)) {
             uri += "/" + nodeDataName;
         }
         if (StringUtils.isNotEmpty(fileName)) {
             uri += "/" + fileName;
         }
         if (StringUtils.isNotEmpty(uri) && StringUtils.isNotEmpty(extension) && !StringUtils.endsWith(uri, "/")) {
             uri += "." + extension;
         }
 
         return cleanHandle(uri);
     }
 
     public String getHandlePrefix() {
         return handlePrefix;
     }
 
     public void setHandlePrefix(String handlePrefix) {
         this.handlePrefix = handlePrefix;
     }
 
     public String getRepository() {
         return repository;
     }
 
     public void setRepository(String repository) {
         this.repository = repository;
     }
 
     public String getURIPrefix() {
         return URIPrefix;
     }
 
     public void setURIPrefix(String uriPrefix) {
         this.URIPrefix = uriPrefix;
     }
 
     @Override
     public String toString() {
         return this.URIPrefix + " --> " + repository + ":" + this.handlePrefix;
     }
 }