/*
    * 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.column.value.time;
  
  import org.apache.shardingsphere.db.protocol.mysql.packet.binlog.row.column.MySQLBinlogColumnDef;
  import org.apache.shardingsphere.db.protocol.mysql.packet.binlog.row.column.value.MySQLBinlogProtocolValue;
  import org.apache.shardingsphere.db.protocol.mysql.payload.MySQLPacketPayload;
  
  import java.io.Serializable;
  import java.sql.Timestamp;
  import java.time.LocalDateTime;
  import java.util.Date;
  
  /**
   * MySQL DATETIME binlog protocol value.
   * Stored value is in the format YYYYMMDDHHMMSS and can be easily extracted by repeatedly calculating the remainder of dividing the value by 100 and dividing the value by 100
   *
   * @see <a href="https://dev.mysql.com/doc/dev/mysql-server/latest/field__types_8h.html">field type</a>
   */
  public final class MySQLDatetimeBinlogProtocolValue implements MySQLBinlogProtocolValue {
      
      @Override
      public Serializable read(final MySQLBinlogColumnDef columnDef, final MySQLPacketPayload payload) {
          long datetime = payload.readInt8();
          return 0 == datetime ? MySQLTimeValueUtils.DATETIME_OF_ZERO : readDateTime(datetime);
      }
      
      private Date readDateTime(final long datetime) {
          int date = (int) (datetime / 1000000);
          int year = date / 10000;
          int month = (date % 10000) / 100;
          int day = date % 100;
          int time = (int) (datetime % 1000000);
          int hour = time / 10000;
          int minute = (time % 10000) / 100;
          int second = time % 100;
          return Timestamp.valueOf(LocalDateTime.of(year, month, day, hour, minute, second));
      }
  }