/*
    * 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.entity;
  
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  import javax.persistence.Column;
  import javax.persistence.FetchType;
  import javax.persistence.ManyToOne;
  import javax.persistence.MappedSuperclass;
  import javax.validation.constraints.NotNull;
  import org.apache.syncope.core.persistence.api.attrvalue.validation.PlainAttrValidationManager;
  import org.apache.syncope.core.persistence.api.entity.Any;
  import org.apache.syncope.core.persistence.api.entity.AnyUtils;
  import org.apache.syncope.core.persistence.api.entity.PlainAttr;
  import org.apache.syncope.core.persistence.api.entity.PlainAttrUniqueValue;
  import org.apache.syncope.core.persistence.api.entity.PlainAttrValue;
  import org.apache.syncope.core.persistence.api.entity.PlainSchema;
  import org.apache.syncope.core.persistence.jpa.validation.entity.PlainAttrCheck;
  
  @MappedSuperclass
  @PlainAttrCheck
  public abstract class AbstractPlainAttr<O extends Any<?>> extends AbstractGeneratedKeyEntity implements PlainAttr<O> {
  
      private static final long serialVersionUID = -9115431608821806124L;
  
      @NotNull
      @ManyToOne(fetch = FetchType.EAGER)
      @Column(name = "schema_id")
      protected JPAPlainSchema schema;
  
      @Override
      public JPAPlainSchema getSchema() {
          return schema;
      }
  
      @Override
      public void setSchema(final PlainSchema schema) {
          checkType(schema, JPAPlainSchema.class);
          this.schema = (JPAPlainSchema) schema;
      }
  
      protected abstract boolean addForMultiValue(PlainAttrValue attrValue);
  
      private void checkNonNullSchema() {
          if (getSchema() == null) {
              throw new IllegalStateException("First set owner then schema and finally add values");
          }
      }
  
      @Override
      public void add(final PlainAttrValidationManager validator, final String value, final PlainAttrValue attrValue) {
          checkNonNullSchema();
  
          attrValue.setAttr(this);
          validator.validate(getSchema(), value, attrValue);
  
          if (getSchema().isUniqueConstraint()) {
              setUniqueValue((PlainAttrUniqueValue) attrValue);
          } else {
              if (!getSchema().isMultivalue()) {
                  getValues().clear();
              }
              addForMultiValue(attrValue);
          }
      }
  
      @Override
      public void add(final PlainAttrValidationManager validator, final String value, final AnyUtils anyUtils) {
          checkNonNullSchema();
  
          PlainAttrValue attrValue;
          if (getSchema().isUniqueConstraint()) {
              attrValue = anyUtils.newPlainAttrUniqueValue();
              ((PlainAttrUniqueValue) attrValue).setSchema(getSchema());
          } else {
              attrValue = anyUtils.newPlainAttrValue();
          }
  
          add(validator, value, attrValue);
      }
  
     @Override
     public List<String> getValuesAsStrings() {
         List<String> result;
         if (getUniqueValue() == null) {
             result = getValues().stream().map(PlainAttrValue::getValueAsString).collect(Collectors.toList());
         } else {
             result = List.of(getUniqueValue().getValueAsString());
         }
 
         return Collections.unmodifiableList(result);
     }
 
 }