/*
    * This file is part of ***  M y C o R e  ***
    * See http://www.mycore.de/ for details.
    *
    * MyCoRe is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    *
   * MyCoRe is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with MyCoRe.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package org.mycore.oai.set;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.solr.client.solrj.SolrQuery;
  import org.apache.solr.common.SolrDocument;
  import org.mycore.common.config.MCRConfiguration2;
  import org.mycore.common.config.MCRConfigurationException;
  
  /**
   * Default implementation for a set configuration. Loads the information from the
   * {@link MCRConfiguration2} (MCR.OAIDataProvider.myprovider.Sets.<b>SET_ID</b>).
   * 
   * @author Matthias Eichner
   */
  public class MCROAISolrSetConfiguration implements MCROAISetConfiguration<SolrQuery, SolrDocument, String> {
  
      private static final String SETS_PREFIX = "Sets.";
  
      private String id;
  
      private String uri;
  
      private MCROAISetHandler<SolrQuery, SolrDocument, String> handler;
  
      public MCROAISolrSetConfiguration(String configPrefix, String setId) {
          String setConfigPrefix = configPrefix + SETS_PREFIX + setId;
          String defaultname = getFallbackHandler(configPrefix, setId);
          MCROAISetHandler<SolrQuery, SolrDocument, String> handler = defaultname == null
              ? MCRConfiguration2.getOrThrow(setConfigPrefix + ".Handler", MCRConfiguration2::instantiateClass)
              : MCRConfiguration2.<MCROAISetHandler<SolrQuery, SolrDocument, String>>getInstanceOf(
                  setConfigPrefix + ".Handler")
                  .orElseGet(() -> MCRConfiguration2.instantiateClass(defaultname));
          handler.init(configPrefix, setId);
          this.id = setId;
          this.uri = getURI(setConfigPrefix);
          this.handler = handler;
      }
  
      private String getURI(String setConfigPrefix) {
          String uriProperty = setConfigPrefix + ".URI";
          try {
              return MCRConfiguration2.getStringOrThrow(uriProperty);
          } catch (MCRConfigurationException e) {
              String legacy = MCRConfiguration2.getString(setConfigPrefix).orElseThrow(() -> e);
              LogManager.getLogger().warn("Please rename deprecated property '{}' to '{}'.", setConfigPrefix,
                  uriProperty);
              return legacy;
          }
      }
  
      private String getFallbackHandler(String configPrefix, String setId) {
          String queryProperty = configPrefix + SETS_PREFIX + setId + ".Query";
          if (MCRConfiguration2.getString(queryProperty)
              .orElse(MCRConfiguration2.getString(configPrefix + "MapSetToQuery." + setId).orElse(null)) != null) {
              return MCROAIQueryToSetHandler.class.getName();
          }
          String classProperty = configPrefix + SETS_PREFIX + setId + ".Classification";
          if (MCRConfiguration2.getString(classProperty)
              .orElse(MCRConfiguration2.getString(configPrefix + "MapSetToClassification." + setId)
                  .orElse(null))
              != null) {
              return MCROAIClassificationToSetHandler.class.getName();
          }
          if (MCRConfiguration2.getString(configPrefix + SETS_PREFIX + setId + ".Handler").orElse(null) == null) {
              LogManager.getLogger().error(
                  "Neither '{}' nor '{}' is defined. Please map set '{}' to classification or query.", classProperty,
                  queryProperty, setId);
              return MCROAIClassificationToSetHandler.class.getName();
          }
          return null;
      }
  
      @Override
      public String getId() {
          return this.id;
      }
  
      @Override
      public String getURI() {
          return this.uri;
      }
 
     @Override
     public MCROAISetHandler<SolrQuery, SolrDocument, String> getHandler() {
         return this.handler;
     }
 
 }