package host

import (
	"fmt"
	"lux/proto"
)

type LuxOptionType uint

const (
	LuxOptionTypeWAN   = 0
	LuxOptionTypeNetIf = 1
)

type LuxOption interface {
	Read(rd *proto.LuxBuffer) error
	Write(wd *proto.LuxBuffer)

	Type() LuxOptionType
}

func ReadLuxOption(rd *proto.LuxBuffer) (LuxOption, error) {
	var err error
	optVal, err := rd.ReadUint16()
	if err != nil {
		return nil, err
	}

	switch LuxOptionType(optVal) {
	case LuxOptionTypeWAN:
		opt := &LuxOptionWAN{}
		err = opt.Read(rd)
		return opt, err
	case LuxOptionTypeNetIf:
		opt := NewLuxOptionNetIf()
		err := opt.Read(rd)
		return &opt, err
	default:
		return nil, fmt.Errorf("unknown option %d", optVal)
	}
}

func WriteLuxOption(wd *proto.LuxBuffer, opt LuxOption) {
	wd.WriteUint16(uint16(opt.Type()))
	opt.Write(wd)
}