/*
    * 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.driver.jdbc.adapter;
  
  import com.google.common.base.Preconditions;
  import lombok.Getter;
  import org.apache.shardingsphere.driver.jdbc.adapter.executor.ForceExecuteTemplate;
  import org.apache.shardingsphere.driver.jdbc.core.connection.ShardingSphereConnection;
  import org.apache.shardingsphere.driver.jdbc.core.resultset.ShardingSphereResultSetMetaData;
  import org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement;
  import org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSphereStatement;
  import org.apache.shardingsphere.driver.jdbc.unsupported.AbstractUnsupportedOperationResultSet;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
  
  import java.sql.ResultSet;
  import java.sql.ResultSetMetaData;
  import java.sql.SQLException;
  import java.sql.SQLWarning;
  import java.sql.Statement;
  import java.util.List;
  
  /**
   * Adapter for {@code ResultSet}.
   */
  public abstract class AbstractResultSetAdapter extends AbstractUnsupportedOperationResultSet {
      
      private final List<ResultSet> resultSets;
      
      @Getter
      private final Statement statement;
      
      private final SQLStatementContext sqlStatementContext;
      
      private final ForceExecuteTemplate<ResultSet> forceExecuteTemplate;
      
      private boolean closed;
      
      protected AbstractResultSetAdapter(final List<ResultSet> resultSets, final Statement statement, final SQLStatementContext sqlStatementContext) {
          Preconditions.checkArgument(!resultSets.isEmpty());
          this.resultSets = resultSets;
          this.statement = statement;
          this.sqlStatementContext = sqlStatementContext;
          forceExecuteTemplate = new ForceExecuteTemplate<>();
      }
      
      @Override
      public final ResultSetMetaData getMetaData() throws SQLException {
          return new ShardingSphereResultSetMetaData(resultSets.get(0).getMetaData(), getDatabase(), sqlStatementContext);
      }
      
      private ShardingSphereDatabase getDatabase() {
          ShardingSphereConnection connection = statement instanceof ShardingSpherePreparedStatement
                  ? ((ShardingSpherePreparedStatement) statement).getConnection()
                  : ((ShardingSphereStatement) statement).getConnection();
          return connection.getContextManager().getMetaDataContexts().getMetaData().getDatabase(connection.getCurrentDatabaseName());
      }
      
      @Override
      public final int findColumn(final String columnLabel) throws SQLException {
          return resultSets.get(0).findColumn(columnLabel);
      }
      
      @Override
      public final void setFetchDirection(final int direction) throws SQLException {
          forceExecuteTemplate.execute(resultSets, resultSet -> resultSet.setFetchDirection(direction));
      }
      
      @Override
      public final int getFetchDirection() throws SQLException {
          return resultSets.get(0).getFetchDirection();
      }
      
      @Override
      public final void setFetchSize(final int rows) throws SQLException {
          forceExecuteTemplate.execute(resultSets, resultSet -> resultSet.setFetchSize(rows));
      }
      
      @Override
      public final int getFetchSize() throws SQLException {
          return resultSets.get(0).getFetchSize();
      }
      
      @Override
     public final int getType() throws SQLException {
         return resultSets.get(0).getType();
     }
     
     @Override
     public final int getConcurrency() throws SQLException {
         return resultSets.get(0).getConcurrency();
     }
     
     @Override
     public final SQLWarning getWarnings() throws SQLException {
         return resultSets.get(0).getWarnings();
     }
     
     @Override
     public final void clearWarnings() throws SQLException {
         forceExecuteTemplate.execute(resultSets, ResultSet::clearWarnings);
     }
     
     @Override
     public final boolean isClosed() {
         return closed;
     }
     
     @Override
     public final void close() throws SQLException {
         closed = true;
         forceExecuteTemplate.execute(resultSets, ResultSet::close);
     }
 }