/**
    * This file Copyright (c) 2013-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.dam.app;
  
  import info.magnolia.dam.app.ui.field.configuration.EditAssetAppConfiguration;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.google.common.net.MediaType;
  
  /**
   * DAM app configuration bean.
   */
  public class DamAppConfiguration {
  
      private List<EditAssetAppConfiguration> editAssetAppConfigurations = new ArrayList<>();
  
      public List<EditAssetAppConfiguration> getEditAssetAppConfigurations() {
          return editAssetAppConfigurations;
      }
  
      public void setEditAssetAppConfigurations(List<EditAssetAppConfiguration> editAssetAppConfigurations) {
          this.editAssetAppConfigurations = editAssetAppConfigurations;
      }
  
      public void addEditAssetAppConfiguration(EditAssetAppConfiguration editAssetAppConfiguration) {
          this.editAssetAppConfigurations.add(editAssetAppConfiguration);
      }
  
      /**
       * @return the {@link EditAssetAppConfiguration} configured for the requested mediaType.
       * throw new IllegalArgumentException if no {@link EditAssetAppConfiguration} is found in configuration.
       */
      public EditAssetAppConfiguration getEditAssetAppConfigurationForMediaType(MediaType mediaType) {
  
          if (mediaType == null) {
              throw new IllegalArgumentException("Requested mediaType must not be null");
          }
  
          EditAssetAppConfiguration resolvedConfiguration = null;
          MediaType bestCandidate = MediaType.ANY_TYPE;
          for (EditAssetAppConfiguration configuration : editAssetAppConfigurations) {
              for (MediaType configuredMediaType : configuration.getSupportedMediaTypes()) {
                  if (mediaType.is(configuredMediaType)) {
                      bestCandidate = getBestMatchingCandidate(bestCandidate, configuredMediaType, mediaType);
                      if (bestCandidate == configuredMediaType) {
                          resolvedConfiguration = configuration;
                      }
                  }
              }
          }
          if(resolvedConfiguration == null) {
              throw new IllegalArgumentException("Configuration do not define an EditAssetAppConfiguration for the following mediaType " + mediaType.toString());
          }
          return resolvedConfiguration;
      }
  
      /**
       * @return bets matching {@link MediaType} for 'reference' between 'candidate1' and 'candidate2'. If both candidate have the same matching average, return 'candidate1'.
       */
      MediaType getBestMatchingCandidate(MediaType candidate1, MediaType candidate2, MediaType reference) {
          if(reference.equals(candidate1)) {
              return candidate1;
          }
          if(reference.equals(candidate2)) {
             return candidate2;
         }
 
         if (voteOnMediaType(candidate1, reference) >= voteOnMediaType(candidate2, reference)) {
             return candidate1;
         }
         return candidate2;
     }
 
     int voteOnMediaType(MediaType candidate, MediaType reference) {
         int res = 0;
         if (!reference.parameters().isEmpty() && candidate.parameters().entries().containsAll(reference.parameters().entries())) {
             res += 1;
         }
         if (StringUtils.equals(reference.type(), candidate.type())) {
             res += 2;
         }
         if (StringUtils.equals(reference.subtype(), candidate.subtype())) {
             res += 3;
         }
         return res;
     }
 }