/*
    * 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.infra.binder.context.statement.ddl;
  
  import lombok.Getter;
  import org.apache.shardingsphere.infra.binder.context.segment.table.TablesContext;
  import org.apache.shardingsphere.infra.binder.context.statement.CommonSQLStatementContext;
  import org.apache.shardingsphere.infra.binder.context.type.ConstraintAvailable;
  import org.apache.shardingsphere.infra.binder.context.type.IndexAvailable;
  import org.apache.shardingsphere.infra.binder.context.type.TableAvailable;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.column.ColumnDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.ConstraintDefinitionSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.constraint.ConstraintSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.ddl.index.IndexSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.ColumnSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.SimpleTableSegment;
  import org.apache.shardingsphere.sql.parser.sql.common.statement.ddl.CreateTableStatement;
  
  import java.util.Collection;
  import java.util.LinkedList;
  
  /**
   * Create table statement context.
   */
  @Getter
  public final class CreateTableStatementContext extends CommonSQLStatementContext implements TableAvailable, IndexAvailable, ConstraintAvailable {
      
      private final TablesContext tablesContext;
      
      public CreateTableStatementContext(final CreateTableStatement sqlStatement) {
          super(sqlStatement);
          tablesContext = new TablesContext(sqlStatement.getTable(), getDatabaseType());
      }
      
      @Override
      public CreateTableStatement getSqlStatement() {
          return (CreateTableStatement) super.getSqlStatement();
      }
      
      @Override
      public Collection<SimpleTableSegment> getAllTables() {
          Collection<SimpleTableSegment> result = new LinkedList<>();
          result.add(getSqlStatement().getTable());
          for (ColumnDefinitionSegment each : getSqlStatement().getColumnDefinitions()) {
              result.addAll(each.getReferencedTables());
          }
          for (ConstraintDefinitionSegment each : getSqlStatement().getConstraintDefinitions()) {
              if (each.getReferencedTable().isPresent()) {
                  result.add(each.getReferencedTable().get());
              }
          }
          return result;
      }
      
      @Override
      public Collection<IndexSegment> getIndexes() {
          Collection<IndexSegment> result = new LinkedList<>();
          for (ConstraintDefinitionSegment each : getSqlStatement().getConstraintDefinitions()) {
              each.getIndexName().ifPresent(result::add);
          }
          return result;
      }
      
      @Override
      public Collection<ConstraintSegment> getConstraints() {
          Collection<ConstraintSegment> result = new LinkedList<>();
          for (ConstraintDefinitionSegment each : getSqlStatement().getConstraintDefinitions()) {
              each.getConstraintName().ifPresent(result::add);
          }
          return result;
      }
      
      @Override
      public Collection<ColumnSegment> getIndexColumns() {
          Collection<ColumnSegment> result = new LinkedList<>();
          for (ConstraintDefinitionSegment each : getSqlStatement().getConstraintDefinitions()) {
              result.addAll(each.getIndexColumns());
          }
          return result;
      }
  }