package wkproto

import "github.com/pkg/errors"

type SubPacket struct {
	Framer
	Setting     Setting
	SubNo       string
	ChannelID   string // 频道ID（如果是个人频道ChannelId为个人的UID）
	ChannelType uint8  // 频道类型
	Action      Action // 动作
	Param       string // 参数
}

// GetPacketType 包类型
func (s *SubPacket) GetFrameType() FrameType {
	return SUB
}

func decodeSub(frame Frame, data []byte, version uint8) (Frame, error) {

	dec := NewDecoder(data)

	subPacket := &SubPacket{}
	subPacket.Framer = frame.(Framer)
	var err error
	setting, err := dec.Uint8()
	if err != nil {
		return nil, errors.Wrap(err, "解码消息设置失败！")
	}
	subPacket.Setting = Setting(setting)
	// 客户端消息编号
	if subPacket.SubNo, err = dec.String(); err != nil {
		return nil, errors.Wrap(err, "解码SubNo失败！")
	}
	// 频道ID
	if subPacket.ChannelID, err = dec.String(); err != nil {
		return nil, errors.Wrap(err, "解码ChannelId失败！")
	}
	// 频道类型
	if subPacket.ChannelType, err = dec.Uint8(); err != nil {

		return nil, errors.Wrap(err, "解码ChannelType失败！")
	}
	// 动作
	var action uint8
	if action, err = dec.Uint8(); err != nil {
		return nil, errors.Wrap(err, "解码Action失败！")
	}
	subPacket.Action = Action(action)

	// 参数
	if subPacket.Param, err = dec.String(); err != nil {
		return nil, errors.Wrap(err, "解码Param失败！")
	}

	return subPacket, nil
}

func encodeSub(frame Frame, enc *Encoder, version uint8) error {
	subPacket := frame.(*SubPacket)
	_ = enc.WriteByte(subPacket.Setting.Uint8())
	// 客户端消息编号
	enc.WriteString(subPacket.SubNo)
	// 频道ID
	enc.WriteString(subPacket.ChannelID)
	// 频道类型
	enc.WriteUint8(subPacket.ChannelType)
	// 动作
	enc.WriteUint8(subPacket.Action.Uint8())
	// 参数
	enc.WriteString(subPacket.Param)
	return nil
}

func encodeSubSize(frame Frame, version uint8) int {
	subPacket := frame.(*SubPacket)
	var size = 0
	size += SettingByteSize
	size += (len(subPacket.SubNo) + StringFixLenByteSize)
	size += (len(subPacket.ChannelID) + StringFixLenByteSize)
	size += ChannelTypeByteSize
	size += ActionByteSize
	size += (len(subPacket.Param) + StringFixLenByteSize)
	return size
}