/*
    * 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.shardingsphere.sql.parser.sql.common.segment.generic.table;
  
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import lombok.Setter;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.AliasSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.OwnerAvailable;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.OwnerSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.PivotSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue;
  
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.Optional;
  
  /**
   * Simple table segment.
   */
  @RequiredArgsConstructor
  @Getter
  public final class SimpleTableSegment implements TableSegment, OwnerAvailable {
      
      private final TableNameSegment tableName;
      
      @Setter
      private OwnerSegment owner;
      
      @Setter
      private AliasSegment alias;
      
      private final Collection<IndexHintSegment> indexHintSegments = new LinkedList<>();
      
      @Setter
      private PivotSegment pivot;
      
      @Setter
      private IdentifierValue dbLink;
      
      @Setter
      private IdentifierValue at;
      
      @Override
      public int getStartIndex() {
          if (null == owner) {
              return tableName.getStartIndex();
          }
          return owner.getOwner().isPresent() ? owner.getOwner().get().getStartIndex() : owner.getStartIndex();
      }
      
      @Override
      public int getStopIndex() {
          return null == alias ? tableName.getStopIndex() : alias.getStopIndex();
      }
      
      @Override
      public Optional<OwnerSegment> getOwner() {
          return Optional.ofNullable(owner);
      }
      
      public Optional<IdentifierValue> getDbLink() {
          return Optional.ofNullable(dbLink);
      }
      
      public Optional<IdentifierValue> getAt() {
          return Optional.ofNullable(at);
      }
      
      @Override
      public Optional<String> getAliasName() {
          return null == alias ? Optional.empty() : Optional.ofNullable(alias.getIdentifier().getValue());
      }
      
      @Override
      public Optional<IdentifierValue> getAlias() {
          return Optional.ofNullable(alias).map(AliasSegment::getIdentifier);
      }
      
      /**
       * Get alias segment.
       * 
       * @return alias segment
       */
     public Optional<AliasSegment> getAliasSegment() {
         return Optional.ofNullable(alias);
     }
     
     /**
      * Get pivot segment.
      * 
      * @return pivot segment
      */
     public Optional<PivotSegment> getPivot() {
         return Optional.ofNullable(pivot);
     }
 }