/*
    * Copyright (c) 2002-2017, 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.form.web;
  
  import com.keypoint.PngEncoder;
  
  import fr.paris.lutece.plugins.form.business.GraphType;
  import fr.paris.lutece.plugins.form.business.GraphTypeHome;
  import fr.paris.lutece.plugins.form.service.IResponseService;
  import fr.paris.lutece.plugins.form.utils.FormUtils;
  import fr.paris.lutece.plugins.genericattributes.business.Entry;
  import fr.paris.lutece.plugins.genericattributes.business.EntryHome;
  import fr.paris.lutece.plugins.genericattributes.business.StatisticEntrySubmit;
  import fr.paris.lutece.portal.service.plugin.Plugin;
  import fr.paris.lutece.portal.service.plugin.PluginService;
  import fr.paris.lutece.portal.service.spring.SpringContextService;
  import fr.paris.lutece.portal.service.util.AppLogService;
  import fr.paris.lutece.portal.service.util.AppPathService;
  
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.lang.StringUtils;
  
  import org.jfree.chart.ChartRenderingInfo;
  import org.jfree.chart.JFreeChart;
  import org.jfree.chart.entity.StandardEntityCollection;
  
  import java.awt.image.BufferedImage;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  
  import java.util.List;
  
  import javax.imageio.ImageIO;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   *
   * class DoDownloadGraph
   *
   */
  public class DoDownloadGraph
  {
      private static final String PARAMETER_ID_ENTRY = "id_entry";
      private static final String PARAMETER_ID_GRAPH_TYPE = "id_graph_type";
      private static final String PARAMETER_GRAPH_THREE_DIMENSION = "graph_three_dimension";
      private static final String PARAMETER_GRAPH_LABEL_VALUE = "graph_label_value";
      private static final String PARAMETER_PLUGIN_NAME = "plugin_name";
      private static final String EMPTY_STRING = "";
      private IResponseService _responseService = SpringContextService.getBean( FormUtils.BEAN_FORM_RESPONSE_SERVICE );
  
      /**
       * Write in the http response the statistic graph of a question
       * 
       * @param request
       *            the http request
       * @param response
       *            The http response
       *
       */
      public void doGenerateGraph( HttpServletRequest request, HttpServletResponse response )
      {
          JFreeChart chart = null;
          Plugin plugin = null;
          Entry entry;
          GraphType graphType = null;
         int nIdEntry = -1;
         int nIdGraphType = -1;
 
         String strIdEntry = request.getParameter( PARAMETER_ID_ENTRY );
         String strIdGraphType = request.getParameter( PARAMETER_ID_GRAPH_TYPE );
         String strPluginName = request.getParameter( PARAMETER_PLUGIN_NAME );
         String strGraphThreeDimension = request.getParameter( PARAMETER_GRAPH_THREE_DIMENSION );
         String strGraphLabelValue = request.getParameter( PARAMETER_GRAPH_LABEL_VALUE );
 
         boolean nGraphThreeDimension = false;
         boolean nGraphLabelValue = false;
 
         if ( ( strGraphThreeDimension != null ) && strGraphThreeDimension.equals( "1" ) )
         {
             nGraphThreeDimension = true;
         }
 
         if ( ( strGraphLabelValue != null ) && strGraphLabelValue.equals( "1" ) )
         {
             nGraphLabelValue = true;
         }
 
         if ( ( strIdEntry != null ) && !strIdEntry.equals( EMPTY_STRING ) && ( strIdGraphType != null ) && !strIdGraphType.equals( EMPTY_STRING )
                 && ( strPluginName != null ) && !strPluginName.equals( EMPTY_STRING ) )
         {
             plugin = PluginService.getPlugin( strPluginName );
 
             try
             {
                 nIdEntry = Integer.parseInt( strIdEntry );
                 nIdGraphType = Integer.parseInt( strIdGraphType );
             }
             catch( NumberFormatException ne )
             {
                 AppLogService.error( ne );
             }
 
             entry = EntryHome.findByPrimaryKey( nIdEntry );
 
             List<StatisticEntrySubmit> listStatistic = _responseService.getStatisticByIdEntry( nIdEntry );
             graphType = GraphTypeHome.findByPrimaryKey( nIdGraphType, plugin );
 
             if ( graphType != null )
             {
                 try
                 {
                     if ( isListStatisticValid( listStatistic ) )
                     {
                         chart = graphType.createChart( listStatistic, entry.getTitle( ), nGraphThreeDimension, nGraphLabelValue );
 
                         ChartRenderingInfo info = new ChartRenderingInfo( new StandardEntityCollection( ) );
                         BufferedImage chartImage = chart.createBufferedImage( 600, 200, info );
                         response.setContentType( "image/PNG" );
 
                         PngEncoder encoder = new PngEncoder( chartImage, false, 0, 9 );
                         response.getOutputStream( ).write( encoder.pngEncode( ) );
                         response.getOutputStream( ).close( );
                     }
                     else
                     {
                         BufferedImage image = ImageIO.read( new File( AppPathService.getWebAppPath( ) + "/images/none.jpg" ) );
                         ByteArrayOutputStream baos = new ByteArrayOutputStream( );
                         ImageIO.write( image, "png", baos );
 
                         response.getOutputStream( ).write( baos.toByteArray( ) );
                         response.getOutputStream( ).close( );
                     }
                 }
                 catch( Exception e )
                 {
                     AppLogService.error( e.getMessage( ), e );
                 }
             }
         }
     }
 
     /**
      * Check if list statistic is valid for display
      * 
      * @param listStatistic
      *            list of entry stats
      * @return true if list is valid, false otherwise
      */
     private boolean isListStatisticValid( List<StatisticEntrySubmit> listStatistic )
     {
         if ( CollectionUtils.isEmpty( listStatistic ) )
         {
             return false;
         }
 
         for ( StatisticEntrySubmit stat : listStatistic )
         {
             if ( StringUtils.isBlank( stat.getFieldLibelle( ) ) )
             {
                 return false;
             }
         }
 
         return true;
     }
 }