/*
    * 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.db.protocol.postgresql.packet.command.query.extended;
  
  import lombok.Getter;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.PostgreSQLCommandPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.bind.PostgreSQLComBindPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.execute.PostgreSQLComExecutePacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.parse.PostgreSQLComParsePacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLIdentifierTag;
  import org.apache.shardingsphere.db.protocol.postgresql.payload.PostgreSQLPacketPayload;
  
  import java.util.List;
  
  @Getter
  public final class PostgreSQLAggregatedCommandPacket extends PostgreSQLCommandPacket {
      
      private final List<PostgreSQLCommandPacket> packets;
      
      private final boolean containsBatchedStatements;
      
      private final int batchPacketBeginIndex;
      
      private final int batchPacketEndIndex;
      
      public PostgreSQLAggregatedCommandPacket(final List<PostgreSQLCommandPacket> packets) {
          this.packets = packets;
          String firstStatementId = null;
          String firstPortal = null;
          int parsePacketCount = 0;
          int bindPacketCountForFirstStatement = 0;
          int executePacketCountForFirstStatement = 0;
          int batchPacketBeginIndex = -1;
          int batchPacketEndIndex = -1;
          int index = 0;
          for (PostgreSQLCommandPacket each : packets) {
              if (each instanceof PostgreSQLComParsePacket) {
                  if (++parsePacketCount > 1) {
                      break;
                  }
                  if (null == firstStatementId) {
                      firstStatementId = ((PostgreSQLComParsePacket) each).getStatementId();
                  } else if (!firstStatementId.equals(((PostgreSQLComParsePacket) each).getStatementId())) {
                      break;
                  }
              }
              if (each instanceof PostgreSQLComBindPacket) {
                  if (-1 == batchPacketBeginIndex) {
                      batchPacketBeginIndex = index;
                  }
                  if (null == firstStatementId) {
                      firstStatementId = ((PostgreSQLComBindPacket) each).getStatementId();
                  } else if (!firstStatementId.equals(((PostgreSQLComBindPacket) each).getStatementId())) {
                      break;
                  }
                  if (null == firstPortal) {
                      firstPortal = ((PostgreSQLComBindPacket) each).getPortal();
                  } else if (!firstPortal.equals(((PostgreSQLComBindPacket) each).getPortal())) {
                      break;
                  }
                  bindPacketCountForFirstStatement++;
              }
              if (each instanceof PostgreSQLComExecutePacket) {
                  if (index > batchPacketEndIndex) {
                      batchPacketEndIndex = index;
                  }
                  if (null == firstPortal) {
                      firstPortal = ((PostgreSQLComExecutePacket) each).getPortal();
                  } else if (!firstPortal.equals(((PostgreSQLComExecutePacket) each).getPortal())) {
                      break;
                  }
                  executePacketCountForFirstStatement++;
              }
              index++;
          }
          this.batchPacketBeginIndex = batchPacketBeginIndex;
          this.batchPacketEndIndex = batchPacketEndIndex;
          containsBatchedStatements = bindPacketCountForFirstStatement == executePacketCountForFirstStatement && bindPacketCountForFirstStatement >= 3;
      }
      
      @Override
      protected void write(final PostgreSQLPacketPayload payload) {
      }
      
     @Override
     public PostgreSQLIdentifierTag getIdentifier() {
         return () -> '?';
     }
 }