/**
 *
 * Copyright
 * 2009-2015 Jayway Products AB
 * 2016-2017 Föreningen Sambruk
 *
 * Licensed under AGPL, Version 3.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.gnu.org/licenses/agpl.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package se.streamsource.dci.restlet.server.responsewriter;

import org.restlet.Request;
import org.restlet.data.CharacterSet;
import org.restlet.data.Language;
import org.restlet.data.MediaType;
import org.restlet.representation.Variant;
import se.streamsource.dci.restlet.server.ResponseWriter;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * Helper methods for ResultWriters
 */
public abstract class AbstractResponseWriter
   implements ResponseWriter
{
   protected static List<Language> ENGLISH = Arrays.asList( Language.ENGLISH );

   protected Variant getVariant( Request request, List<Language> possibleLanguages, List<MediaType> possibleMediaTypes )
   {
      Language language = request.getClientInfo().getPreferredLanguage( possibleLanguages );

      if (language == null)
         language = possibleLanguages.get( 0 );

      MediaType responseType = request.getClientInfo().getPreferredMediaType( possibleMediaTypes );

      if (responseType == null && request.getClientInfo().getPreferredMediaType( Collections.singletonList( MediaType.ALL)) == MediaType.ALL)
      {
         responseType = possibleMediaTypes.get( 0 );
      }

      Variant variant = new Variant( responseType, language );
      variant.setCharacterSet( CharacterSet.UTF_8 );

      return variant;
   }

}