package msg

import (
	"bytes"
	"encoding/binary"
	"joylink.club/bj-rtsts-server/third_party/message"
)

type SsrMsg struct {
	MsgHeader
	SeqNumSsr uint32 // 应答方的序列号
	SeqNumSse uint32 // 请求方的序列号
	SeqInit1  uint32 // 时序初始化通道1 SEQENQ_1^SID_1^T_1(NR)^DATAVER_1
	SeqInit2  uint32 // 时序初始化通道2 SEQENQ_2^SID_2^T_2(NR)^DATAVER_2
	DataVer   byte   // 数据版本号 预留固定值0x01
	Tail      uint16 // 报文位 CRC16
}

func (s *SsrMsg) Encode() []byte {
	data := s.MsgHeader.encode()
	data = binary.LittleEndian.AppendUint32(data, s.SeqNumSsr)
	data = binary.LittleEndian.AppendUint32(data, s.SeqNumSse)
	data = binary.LittleEndian.AppendUint32(data, s.SeqInit1)
	data = binary.LittleEndian.AppendUint32(data, s.SeqInit2)
	data = append(data, s.DataVer)
	s.Tail = message.Rssp_I_Crc16(data)
	data = binary.LittleEndian.AppendUint16(data, s.Tail)
	return data
}

func (s *SsrMsg) Decode(data []byte) error {
	buf := bytes.NewBuffer(data)
	return binary.Read(buf, binary.LittleEndian, s)
}