/*
    * 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.dml.column;
  
  import lombok.Getter;
  import lombok.Setter;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.ExpressionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.ParenthesesSegment;
  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.bounded.ColumnSegmentBoundedInfo;
  import org.apache.shardingsphere.sql.parser.sql.common.value.identifier.IdentifierValue;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  /**
   * Column segment.
   */
  @Getter
  @Setter
  public final class ColumnSegment implements ExpressionSegment, OwnerAvailable {
      
      private final int startIndex;
      
      private final int stopIndex;
      
      private final IdentifierValue identifier;
      
      private List<IdentifierValue> nestedObjectAttributes;
      
      private OwnerSegment owner;
      
      private ColumnSegmentBoundedInfo columnBoundedInfo;
      
      private ColumnSegmentBoundedInfo otherUsingColumnBoundedInfo;
      
      private boolean isVariable;
      
      private List<ParenthesesSegment> parentheses = new LinkedList<>();
      
      public ColumnSegment(final int startIndex, final int stopIndex, final IdentifierValue identifier) {
          this.startIndex = startIndex;
          this.stopIndex = stopIndex;
          this.identifier = identifier;
          columnBoundedInfo = new ColumnSegmentBoundedInfo(identifier);
      }
      
      /**
       * Get qualified name with quote characters.
       * i.e. `field1`, `table1`, field1, table1, `table1`.`field1`, `table1`.field1, table1.`field1` or table1.field1
       *
       * @return qualified name with quote characters
       */
      public String getQualifiedName() {
          String column = identifier.getValueWithQuoteCharacters();
          if (null != nestedObjectAttributes && !nestedObjectAttributes.isEmpty()) {
              column = String.join(".", column, nestedObjectAttributes.stream().map(IdentifierValue::getValueWithQuoteCharacters).collect(Collectors.joining(".")));
          }
          return null == owner ? column : String.join(".", owner.getIdentifier().getValueWithQuoteCharacters(), column);
      }
      
      /**
       * Get expression.
       * 
       * @return expression
       */
      public String getExpression() {
          String column = identifier.getValue();
          if (null != nestedObjectAttributes && !nestedObjectAttributes.isEmpty()) {
              column = String.join(".", column, nestedObjectAttributes.stream().map(IdentifierValue::getValue).collect(Collectors.joining(".")));
          }
          return null == owner ? column : String.join(".", owner.getIdentifier().getValue(), column);
      }
      
      @Override
      public Optional<OwnerSegment> getOwner() {
          return Optional.ofNullable(owner);
      }
      
      @Override
      public String getText() {
         return getExpression();
     }
 }