/*
    * 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.mysql.packet.binlog.row;
  
  import lombok.Getter;
  import org.apache.shardingsphere.db.protocol.mysql.constant.MySQLBinaryColumnType;
  import org.apache.shardingsphere.db.protocol.mysql.packet.binlog.AbstractMySQLBinlogEventPacket;
  import org.apache.shardingsphere.db.protocol.mysql.packet.binlog.MySQLBinlogEventHeader;
  import org.apache.shardingsphere.db.protocol.mysql.packet.binlog.row.column.MySQLBinlogColumnDef;
  import org.apache.shardingsphere.db.protocol.mysql.packet.command.query.binary.execute.MySQLNullBitmap;
  import org.apache.shardingsphere.db.protocol.mysql.payload.MySQLPacketPayload;
  
  import java.util.LinkedList;
  import java.util.List;
  
  /**
   * MySQL binlog table map event packet.
   *
   * @see <a href="https://dev.mysql.com/doc/dev/mysql-server/latest/classbinary__log_1_1Table__map__event.html">TABLE_MAP_EVENT</a>
   */
  @Getter
  public final class MySQLBinlogTableMapEventPacket extends AbstractMySQLBinlogEventPacket {
      
      private final long tableId;
      
      private final int flags;
      
      private final String schemaName;
      
      private final String tableName;
      
      private final int columnCount;
      
      private final List<MySQLBinlogColumnDef> columnDefs;
      
      private final MySQLNullBitmap nullBitMap;
      
      public MySQLBinlogTableMapEventPacket(final MySQLBinlogEventHeader binlogEventHeader, final MySQLPacketPayload payload) {
          super(binlogEventHeader);
          tableId = payload.readInt6();
          flags = payload.readInt2();
          schemaName = payload.readStringFix(payload.readInt1());
          payload.skipReserved(1);
          tableName = payload.readStringFix(payload.readInt1());
          payload.skipReserved(1);
          columnCount = (int) payload.readIntLenenc();
          columnDefs = new LinkedList<>();
          readColumnDefs(payload);
          readColumnMetaDefs(payload);
          nullBitMap = new MySQLNullBitmap(columnCount, payload);
          // mysql 8 binlog table map event include column type def
          // for support lower than 8, read column type def by sql query
          // so skip readable bytes here
          int remainBytesLength = getRemainBytesLength(payload);
          if (remainBytesLength > 0) {
              payload.skipReserved(remainBytesLength);
          }
      }
      
      private void readColumnDefs(final MySQLPacketPayload payload) {
          for (int i = 0; i < columnCount; i++) {
              columnDefs.add(new MySQLBinlogColumnDef(MySQLBinaryColumnType.valueOf(payload.readInt1())));
          }
      }
      
      private void readColumnMetaDefs(final MySQLPacketPayload payload) {
          payload.readIntLenenc();
          for (MySQLBinlogColumnDef each : columnDefs) {
              each.setColumnMeta(readColumnMetaDef(each.getColumnType(), payload));
          }
      }
      
      private int readColumnMetaDef(final MySQLBinaryColumnType columnType, final MySQLPacketPayload payload) {
          switch (columnType) {
              case STRING:
              case DECIMAL:
              case NEWDECIMAL:
                  return payload.getByteBuf().readUnsignedShort();
              case BIT:
              case VAR_STRING:
              case VARCHAR:
              case ENUM:
                  return payload.readInt2();
              case BLOB:
             case TINY_BLOB:
             case DOUBLE:
             case FLOAT:
             case TIME2:
             case TIMESTAMP2:
             case DATETIME2:
             case JSON:
                 return payload.readInt1();
             default:
                 return 0;
         }
     }
     
     @Override
     protected void writeEvent(final MySQLPacketPayload payload) {
         // TODO
     }
 }