/* 
    * Copyright (c) 2002-2022, City of 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.portal.service.fileimage;
  
  import org.apache.commons.fileupload.FileItem;
  
  import fr.paris.lutece.portal.business.file.File;
  import fr.paris.lutece.portal.service.cache.AbstractCacheableService;
  import fr.paris.lutece.portal.service.file.FileService;
  import fr.paris.lutece.portal.service.file.FileServiceException;
  import fr.paris.lutece.portal.service.file.IFileStoreServiceProvider;
  import fr.paris.lutece.portal.service.image.ImageResource;
  import fr.paris.lutece.portal.service.image.ImageResourceManager;
  import fr.paris.lutece.portal.service.image.ImageResourceProvider;
  import fr.paris.lutece.portal.service.init.LuteceInitException;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.util.file.FileUtil;
  
  public class FileImagePublicService extends AbstractCacheableService implements ImageResourceProvider 
  {
  	private static FileImagePublicServiceileImagePublicService.html#FileImagePublicService">FileImagePublicService _singleton = new FileImagePublicService( );
  	public static final String IMAGE_RESOURCE_TYPE_ID = "public_image_resource";
  	private static final IFileStoreServiceProvider _fileStoreService = FileService.getInstance( ).getFileStoreServiceProvider( );
  	
  	/**
       * Creates a new instance of FileImgService
       */
      private FileImagePublicService( )
      {
      	initCache();
      }
      
      /**
       * Init
       *
       * @throws LuteceInitException
       *             if an error occurs
       */
      public static synchronized void init( )
      {
          getInstance( ).register( );
      }
      
      /**
       * Initializes the service
       */
      public void register( )
      {
          ImageResourceManager.registerProvider( this );
      }
  
      /**
       * Get the unique instance of the service
       *
       * @return The unique instance
       */
      public static FileImagePublicService getInstance( )
      {
          return _singleton;
      }
  
  	@Override
  	/**
       * Return the Resource Type id
       *
       * @return The Resource Type Id
       */
      public String getResourceTypeId( )
     {
         return IMAGE_RESOURCE_TYPE_ID;
     }
 
 	@Override
 	public ImageResource getImageResource( int nIdResource )
 	{
         /*get from cache*/
 		String cacheKey = getCacheKey( nIdResource );
 		ImageResource imageresource = (ImageResource) getFromCache( cacheKey );
 		if ( imageresource != null )
 		{
 			return imageresource;
 		}
 		else
 		{
 			/*if no cache*/
 			try 
 			{
 				File file = _fileStoreService.getFile( String.valueOf( nIdResource ) );
 				
 				if ( ( file != null ) && ( file.getPhysicalFile( ) != null ) && FileUtil.hasImageExtension( file.getTitle( ) ) )
 		        {
 		        	ImageResource imageResource = new ImageResource( file );
 		        	putInCache( cacheKey, imageResource);
 		            return imageResource;
 		        }
 			}
 			catch ( FileServiceException e )
 			{
 				AppLogService.error(e);
 			}
 		}
 
         return null;
 	}
 	
 	/**
      * Return the Resource id
      *
      * @param iImageResource
      *            The resource identifier
      * @return The New Resource Id
      */
 	public String addImageResource( FileItem fileItem )
     {
 		try 
 		{
 			return _fileStoreService.storeFileItem( fileItem ) ;
 		}
 		catch ( FileServiceException e )
 		{
 			AppLogService.error(e);
 			return null;
 		}
     }
 
 	@Override
 	public String getName( )
 	{
 		return IMAGE_RESOURCE_TYPE_ID;
 	}
 	
 	/**
      * get the cache key
      * 
      * @param nId
      * @param user
      * @return the key
      */
     private static String getCacheKey( int nId )
     {
         StringBuilder sbKey = new StringBuilder( );
         return sbKey.append( "[" ).append( IMAGE_RESOURCE_TYPE_ID ).append( ":" ).append( nId )
         		.append( "]" ).toString( );
     }
 }