@Serializable
sealed class Order(
    open val ownerId: String,
    open val member: Member,
    open val title: String,
    open val price: Double
) {

    @Serializable
    class OrderOwner(
        ownerId: String,
        member: Member,
        title: String,
        price: Double
    ) : Order(ownerId, member, title, price) {

        @Serializer(forClass = OrderOwner::class)
        companion object : KSerializer<Order> {
            override val descriptor: SerialDescriptor =
                StringDescriptor.withName("MemberInfo")

            @UseExperimental(ExperimentalStdlibApi::class)
            override fun serialize(encoder: Encoder, obj: Order) {
                encoder.encodeString(obj.ownerId)
                encoder.encodeString(obj.member.serialize())
                encoder.encodeString(obj.title)
                encoder.encodeDouble(obj.price)
            }

            @UseExperimental(ExperimentalStdlibApi::class)
            override fun deserialize(decoder: Decoder): Order {
                return OrderOwner(
                    decoder.decodeString(),
                    decoder.decodeString().deserialize(),
                    decoder.decodeString(),
                    decoder.decodeDouble()
                )
            }
        }

    }

    @Serializable
    class OrderReceiver(
        ownerId: String,
        member: Member,
        title: String,
        price: Double
    ) : Order(ownerId, member, title, price) {

        @Serializer(forClass = OrderReceiver::class)
        companion object : KSerializer<Order> {
            override val descriptor: SerialDescriptor =
                StringDescriptor.withName("MemberInfo")

            @UseExperimental(ExperimentalStdlibApi::class)
            override fun serialize(encoder: Encoder, obj: Order) {
                encoder.encodeString(obj.ownerId)
                encoder.encodeString(obj.member.serialize())
                encoder.encodeString(obj.title)
                encoder.encodeDouble(obj.price)
            }

            @UseExperimental(ExperimentalStdlibApi::class)
            override fun deserialize(decoder: Decoder): Order {
                return OrderReceiver(
                    decoder.decodeString(),
                    decoder.decodeString().deserialize(),
                    decoder.decodeString(),
                    decoder.decodeDouble()
                )
            }
        }
    }

    override fun toString(): String {
        return "Order(member=$member, title=$title, price=$price)"
    }
}