/*
    * 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;
  
  import lombok.Getter;
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.db.protocol.binary.BinaryCell;
  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.packet.identifier.PostgreSQLIdentifierPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLIdentifierTag;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLMessagePacketType;
  import org.apache.shardingsphere.db.protocol.postgresql.payload.PostgreSQLPacketPayload;
  
  import java.sql.SQLException;
  import java.sql.SQLXML;
  import java.util.Collection;
  
  /**
   * Data row packet for PostgreSQL.
   */
  @RequiredArgsConstructor
  @Getter
  public final class PostgreSQLDataRowPacket extends PostgreSQLIdentifierPacket {
      
      private final Collection<Object> data;
      
      @Override
      protected void write(final PostgreSQLPacketPayload payload) {
          payload.writeInt2(data.size());
          for (Object each : data) {
              if (each instanceof BinaryCell) {
                  writeBinaryValue(payload, (BinaryCell) each);
              } else {
                  writeTextValue(payload, each);
              }
          }
      }
      
      private void writeBinaryValue(final PostgreSQLPacketPayload payload, final BinaryCell each) {
          Object value = each.getData();
          if (null == value) {
              payload.writeInt4(0xFFFFFFFF);
              return;
          }
          PostgreSQLBinaryProtocolValue binaryProtocolValue = PostgreSQLBinaryProtocolValueFactory.getBinaryProtocolValue(each.getColumnType());
          payload.writeInt4(binaryProtocolValue.getColumnLength(value));
          binaryProtocolValue.write(payload, value);
      }
      
      private void writeTextValue(final PostgreSQLPacketPayload payload, final Object each) {
          if (null == each) {
              payload.writeInt4(0xFFFFFFFF);
          } else if (each instanceof byte[]) {
              payload.writeInt4(((byte[]) each).length);
              payload.writeBytes((byte[]) each);
          } else if (each instanceof SQLXML) {
              writeSQLXMLData(payload, each);
          } else {
              byte[] columnData = each.toString().getBytes(payload.getCharset());
              payload.writeInt4(columnData.length);
              payload.writeBytes(columnData);
          }
      }
      
      private void writeSQLXMLData(final PostgreSQLPacketPayload payload, final Object data) {
          try {
              byte[] dataBytes = ((SQLXML) data).getString().getBytes(payload.getCharset());
              payload.writeInt4(dataBytes.length);
              payload.writeBytes(dataBytes);
          } catch (final SQLException ex) {
              throw new IllegalStateException(ex);
          }
      }
      
      @Override
      public PostgreSQLIdentifierTag getIdentifier() {
          return PostgreSQLMessagePacketType.DATA_ROW;
      }
  }