/*
    * 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.pi;
  
  import static org.mycore.pi.MCRPIJobService.CREATION_PREDICATE;
  
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.mycore.common.config.MCRConfiguration2;
  
  public class MCRPIServiceManager {
  
      public static final String REGISTRATION_SERVICE_CONFIG_PREFIX = "MCR.PI.Service.";
  
      public static MCRPIServiceManager getInstance() {
          return InstanceHolder.INSTANCE;
      }
  
      public List<String> getServiceIDList() {
          return MCRConfiguration2.getInstantiatablePropertyKeys(REGISTRATION_SERVICE_CONFIG_PREFIX)
              .map(s -> s.substring(MCRPIServiceManager.REGISTRATION_SERVICE_CONFIG_PREFIX.length()))
              .collect(Collectors.toList());
      }
  
      public List<MCRPIService<MCRPersistentIdentifier>> getServiceList() {
          return getServiceIDList()
              .stream()
              .map(this::getRegistrationService)
              .collect(Collectors.toList());
      }
  
      public List<MCRPIJobService<MCRPersistentIdentifier>> getAutoCreationList() {
          return getServiceList()
              .stream()
              .filter(service -> service instanceof MCRPIJobService)
              .map(s -> (MCRPIJobService<MCRPersistentIdentifier>) s)
              .filter(service -> MCRConfiguration2
                  .getString(REGISTRATION_SERVICE_CONFIG_PREFIX + service.getServiceID() + "." +
                      CREATION_PREDICATE)
                  .isPresent())
              .collect(Collectors.toList());
      }
  
      public <T extends MCRPersistentIdentifier> MCRPIService<T> getRegistrationService(String id) {
          return MCRConfiguration2
              .<MCRPIService<T>>getSingleInstanceOf(MCRPIServiceManager.REGISTRATION_SERVICE_CONFIG_PREFIX + id).get();
      }
  
      private static class InstanceHolder {
          private static final MCRPIServiceManager INSTANCE = new MCRPIServiceManager();
      }
  
  }