/*
    * 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.parse;
  
  import lombok.AccessLevel;
  import lombok.Getter;
  import org.apache.shardingsphere.db.protocol.packet.sql.SQLReceivedPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.PostgreSQLCommandPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.PostgreSQLCommandPacketType;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.command.query.extended.PostgreSQLColumnType;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLIdentifierTag;
  import org.apache.shardingsphere.db.protocol.postgresql.payload.PostgreSQLPacketPayload;
  import org.apache.shardingsphere.infra.hint.HintValueContext;
  import org.apache.shardingsphere.infra.hint.SQLHintUtils;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Command parse packet for PostgreSQL.
   */
  @Getter
  public final class PostgreSQLComParsePacket extends PostgreSQLCommandPacket implements SQLReceivedPacket {
      
      private final PostgreSQLPacketPayload payload;
      
      private final String statementId;
      
      @Getter(AccessLevel.NONE)
      private final String sql;
      
      private final HintValueContext hintValueContext;
      
      public PostgreSQLComParsePacket(final PostgreSQLPacketPayload payload) {
          this.payload = payload;
          payload.readInt4();
          statementId = payload.readStringNul();
          String originSQL = payload.readStringNul();
          hintValueContext = SQLHintUtils.extractHint(originSQL);
          sql = SQLHintUtils.removeHint(originSQL);
      }
      
      /**
       * Read parameter types from Parse message.
       * 
       * @return types of parameters
       */
      public List<PostgreSQLColumnType> readParameterTypes() {
          int parameterCount = payload.readInt2();
          List<PostgreSQLColumnType> result = new ArrayList<>(parameterCount);
          for (int i = 0; i < parameterCount; i++) {
              result.add(PostgreSQLColumnType.valueOf(payload.readInt4()));
          }
          return result;
      }
      
      @Override
      protected void write(final PostgreSQLPacketPayload payload) {
      }
      
      @Override
      public String getSQL() {
          return sql;
      }
      
      @Override
      public PostgreSQLIdentifierTag getIdentifier() {
          return PostgreSQLCommandPacketType.PARSE_COMMAND;
      }
  }