/*
    * 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.opengauss.packet.command.query.extended.bind;
  
  import lombok.Getter;
  import org.apache.shardingsphere.db.protocol.opengauss.packet.command.OpenGaussCommandPacket;
  import org.apache.shardingsphere.db.protocol.opengauss.packet.command.OpenGaussCommandPacketType;
  import org.apache.shardingsphere.db.protocol.opengauss.packet.identifier.OpenGaussIdentifierTag;
  import org.apache.shardingsphere.db.protocol.postgresql.constant.PostgreSQLValueFormat;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.PostgreSQLColumnType;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.bind.protocol.PostgreSQLBinaryProtocolValue;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.bind.protocol.PostgreSQLBinaryProtocolValueFactory;
  import org.apache.shardingsphere.db.protocol.postgresql.payload.PostgreSQLPacketPayload;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Batch bind packet for openGauss.
   */
  @Getter
  public final class OpenGaussComBatchBindPacket extends OpenGaussCommandPacket {
      
      private final PostgreSQLPacketPayload payload;
      
      private final int batchNum;
      
      private final String statementId;
      
      private final List<Integer> parameterFormats;
      
      private final List<PostgreSQLValueFormat> resultFormats;
      
      private final int eachGroupParametersCount;
      
      public OpenGaussComBatchBindPacket(final PostgreSQLPacketPayload payload) {
          this.payload = payload;
          payload.readInt4();
          batchNum = payload.readInt4();
          payload.readStringNul();
          statementId = payload.readStringNul();
          int parameterFormatCount = payload.readInt2();
          parameterFormats = new ArrayList<>(parameterFormatCount);
          for (int i = 0; i < parameterFormatCount; i++) {
              parameterFormats.add(payload.readInt2());
          }
          int resultFormatsLength = payload.readInt2();
          resultFormats = new ArrayList<>(resultFormatsLength);
          for (int i = 0; i < resultFormatsLength; i++) {
              resultFormats.add(PostgreSQLValueFormat.valueOf(payload.readInt2()));
          }
          eachGroupParametersCount = payload.readInt2();
      }
      
      /**
       * Read parameter sets from payload.
       *
       * @param parameterTypes types of parameters
       * @return parameter sets
       */
      public List<List<Object>> readParameterSets(final List<PostgreSQLColumnType> parameterTypes) {
          List<List<Object>> result = new ArrayList<>(batchNum);
          for (int i = 0; i < batchNum; i++) {
              result.add(readOneGroupOfParameters(parameterTypes));
          }
          payload.skipReserved(payload.getByteBuf().readableBytes());
          return result;
      }
      
      private List<Object> readOneGroupOfParameters(final List<PostgreSQLColumnType> parameterTypes) {
          List<Object> result = new ArrayList<>(eachGroupParametersCount);
          for (int paramIndex = 0; paramIndex < eachGroupParametersCount; paramIndex++) {
              int paramValueLength = payload.readInt4();
              if (-1 == paramValueLength) {
                  result.add(null);
                  continue;
              }
              Object parameterValue = isTextParameterValue(paramIndex)
                      ? getTextParameters(paramValueLength, parameterTypes.get(paramIndex))
                      : getBinaryParameters(paramValueLength, parameterTypes.get(paramIndex));
              result.add(parameterValue);
          }
          return result;
      }
     
     private boolean isTextParameterValue(final int paramIndex) {
         return parameterFormats.isEmpty() || 0 == parameterFormats.get(paramIndex % parameterFormats.size());
     }
     
     private Object getTextParameters(final int paramValueLength, final PostgreSQLColumnType paramType) {
         String value = payload.getByteBuf().readCharSequence(paramValueLength, payload.getCharset()).toString();
         return paramType.getTextValueParser().parse(value);
     }
     
     private Object getBinaryParameters(final int paramValueLength, final PostgreSQLColumnType columnType) {
         PostgreSQLBinaryProtocolValue binaryProtocolValue = PostgreSQLBinaryProtocolValueFactory.getBinaryProtocolValue(columnType);
         return binaryProtocolValue.read(payload, paramValueLength);
     }
     
     @Override
     protected void write(final PostgreSQLPacketPayload payload) {
     }
     
     @Override
     public OpenGaussIdentifierTag getIdentifier() {
         return OpenGaussCommandPacketType.BATCH_BIND_COMMAND;
     }
 }