/*
    * Copyright (c) 2002-2014, Mairie de Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.updater.service.catalog;
  
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  import fr.paris.lutece.util.httpaccess.HttpAccess;
  import fr.paris.lutece.util.httpaccess.HttpAccessException;
  
  import org.apache.commons.digester.Digester;
  import org.apache.commons.digester.xmlrules.DigesterLoader;
  
  import org.xml.sax.SAXException;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.StringReader;
  
  import java.net.URL;
  
  import java.util.ArrayList;
  import java.util.List;
  
  
  /**
   * CatalogService
   */
  public class CatalogService implements ICatalogService
  {
      private static final String FILE_CATALOGS_LIST_RULES = "/fr/paris/lutece/plugins/updater/service/catalog/catalogs-list-digester-rules.xml";
      private static final String FILE_CATALOG_RULES = "/fr/paris/lutece/plugins/updater/service/catalog/catalog-digester-rules.xml";
      private static final String FILE_CATALOGS_LIST = "/plugins/updater/catalogs.xml";
      private static final String EXCEPTION_MESSAGE = "Error loading catalog : ";
      private List<CatalogInfos> _listInfos = new ArrayList<CatalogInfos>(  );
      private List<Catalog> _listCatalogs = new ArrayList<Catalog>(  );
  
      /**
       * Retrieve all plugin releases from a repository
       * @return A CatalogInfos list
       */
      public List<CatalogInfos> getCatalogInfos(  )
      {
          // clear catalogs data
          _listCatalogs.clear(  );
          _listInfos.clear(  );
  
          try
          {
              // load catalogs list
              File fileCatalogs = new File( AppPathService.getWebAppPath(  ) + FILE_CATALOGS_LIST );
              FileReader readerFile = new FileReader( fileCatalogs );
              loadCatalogsList( readerFile );
  
              HttpAccess httpAccess = new HttpAccess(  );
  
              for ( Catalog catalog : _listCatalogs )
              {
                  String strXmlCatalog = httpAccess.doGet( catalog.getUrl(  ) );
  
                  Reader reader = new StringReader( strXmlCatalog );
                  load( reader );
              }
          }
          catch ( FileNotFoundException e )
          {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
         catch ( HttpAccessException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e.getCause(  ) );
         }
 
         return _listInfos;
     }
 
     /**
      * Add an entry to the catalog
      * @param ci A CatalogInfos entry
      */
     public void addEntry( CatalogInfos ci )
     {
         _listInfos.add( ci );
     }
 
     /**
      * Add a catalog to the list
      * @param catalog A Catalog
      */
     public void addCatalog( Catalog catalog )
     {
         _listCatalogs.add( catalog );
     }
 
     /**
      * Load a catalog list from a reader object
      * @param reader The reader
      */
     private void loadCatalogsList( Reader reader )
     {
         // Configure Digester from XML ruleset
         URL rules = getClass(  ).getResource( FILE_CATALOGS_LIST_RULES );
 
         Digester digester = DigesterLoader.createDigester( rules );
 
         // Push empty List onto Digester's Stack
         digester.push( this );
 
         try
         {
             digester.parse( reader );
         }
         catch ( FileNotFoundException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
         catch ( SAXException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
         catch ( IOException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
     }
 
     /**
      * Load a catalog from a reader object
      * @param reader The reader
      */
     private void load( Reader reader )
     {
         // Configure Digester from XML ruleset
         URL rules = getClass(  ).getResource( FILE_CATALOG_RULES );
 
         Digester digester = DigesterLoader.createDigester( rules );
 
         // Push empty List onto Digester's Stack
         digester.push( this );
 
         try
         {
             digester.parse( reader );
         }
         catch ( FileNotFoundException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
         catch ( SAXException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
         catch ( IOException e )
         {
             AppLogService.error( EXCEPTION_MESSAGE + e.getMessage(  ), e );
         }
     }
 }