/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
   *
   * 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 org.apache.syncope.core.persistence.jpa.dao;
  
  import java.util.Collection;
  import java.util.List;
  import java.util.Objects;
  import java.util.stream.Collectors;
  import javax.persistence.Query;
  import javax.persistence.TypedQuery;
  import org.apache.syncope.core.persistence.api.dao.ExternalResourceDAO;
  import org.apache.syncope.core.persistence.api.dao.VirSchemaDAO;
  import org.apache.syncope.core.persistence.api.entity.AnyTypeClass;
  import org.apache.syncope.core.persistence.api.entity.ExternalResource;
  import org.apache.syncope.core.persistence.api.entity.VirSchema;
  import org.apache.syncope.core.persistence.jpa.entity.JPAVirSchema;
  
  public class JPAVirSchemaDAO extends AbstractDAO<VirSchema> implements VirSchemaDAO {
  
      protected final ExternalResourceDAO resourceDAO;
  
      public JPAVirSchemaDAO(final ExternalResourceDAO resourceDAO) {
          this.resourceDAO = resourceDAO;
      }
  
      @Override
      public VirSchema find(final String key) {
          return entityManager().find(JPAVirSchema.class, key);
      }
  
      @Override
      public List<VirSchema> findByAnyTypeClasses(final Collection<AnyTypeClass> anyTypeClasses) {
          StringBuilder queryString = new StringBuilder("SELECT e FROM ").
                  append(JPAVirSchema.class.getSimpleName()).
                  append(" e WHERE ");
          anyTypeClasses.forEach(anyTypeClass -> queryString.
                  append("e.anyTypeClass.id='").
                  append(anyTypeClass.getKey()).append("' OR "));
  
          TypedQuery<VirSchema> query = entityManager().createQuery(
                  queryString.substring(0, queryString.length() - 4), VirSchema.class);
  
          return query.getResultList();
      }
  
      @Override
      public List<String> find(final ExternalResource resource) {
          Query query = entityManager().createNativeQuery(
                  "SELECT id FROM " + JPAVirSchema.TABLE + " e WHERE e.resource_id=?");
          query.setParameter(1, resource.getKey());
  
          @SuppressWarnings("unchecked")
          List<Object> results = query.getResultList();
          return results.stream().
                  map(Object::toString).
                  collect(Collectors.toList());
      }
  
      @Override
      public List<VirSchema> find(final String resource, final String anyType) {
          Query query = entityManager().createNativeQuery(
                  "SELECT id FROM " + JPAVirSchema.TABLE + " e WHERE e.resource_id=? AND e.anyType_id=?");
          query.setParameter(1, resource);
          query.setParameter(2, anyType);
  
          @SuppressWarnings("unchecked")
          List<Object> results = query.getResultList();
          return results.stream().
                  map(row -> find(row.toString())).
                  filter(Objects::nonNull).
                  collect(Collectors.toList());
      }
  
      @Override
      public List<VirSchema> findByKeyword(final String keyword) {
          TypedQuery<VirSchema> query = entityManager().createQuery(
                  "SELECT e FROM " + JPAVirSchema.class.getSimpleName() + " e"
                  + " WHERE e.id LIKE :keyword", VirSchema.class);
          query.setParameter("keyword", keyword);
          return query.getResultList();
      }
  
      @Override
     public List<VirSchema> findAll() {
         TypedQuery<VirSchema> query = entityManager().createQuery(
                 "SELECT e FROM " + JPAVirSchema.class.getSimpleName() + " e", VirSchema.class);
         return query.getResultList();
     }
 
     @Override
     public VirSchema save(final VirSchema schema) {
         ((JPAVirSchema) schema).map2json();
         return entityManager().merge(schema);
     }
 
     @Override
     public void delete(final String key) {
         VirSchema schema = find(key);
         if (schema == null) {
             return;
         }
 
         resourceDAO.deleteMapping(key);
 
         if (schema.getAnyTypeClass() != null) {
             schema.getAnyTypeClass().getVirSchemas().remove(schema);
         }
 
         entityManager().remove(schema);
     }
 }