package com.terradue.jcatalogue.client.download;
   
   import java.io.File;
   import java.net.URI;
   
   import lombok.AccessLevel;
   import lombok.Data;
   import lombok.Getter;
   
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.terradue.jcatalogue.client.HttpMethod;
  import com.terradue.jcatalogue.client.internal.ahc.HttpInvoker;
  
  @Data
  @Protocol({ "http", "https" })
  public final class HttpDownloader
      implements Downloader
  {
  
      private final Logger logger = LoggerFactory.getLogger( getClass() );
  
      @Getter( AccessLevel.NONE )
      private final HttpInvoker httpInvoker;
  
      @Override
      public <T> T download( File targetDir, URI fileUri, DownloadHandler<T> handler )
      {
          String fileName = fileUri.getPath().substring( fileUri.getPath().lastIndexOf( '/' ) + 1 );
  
          File targetFile = new File( targetDir, fileName );
  
          if ( logger.isInfoEnabled() )
          {
              logger.info( "Downloading {} to {}...", fileUri, targetDir );
          }
  
          try
          {
              return httpInvoker.invoke( HttpMethod.GET, fileUri, new HttpDownloadHandler<T>( targetFile, handler ) );
          }
          catch ( Exception e )
          {
              handler.onError( e );
              return null;
          }
      }
  
  }