tgbotapi/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/ChatMember/abstracts/ChatMember.kt

package dev.inmo.tgbotapi.types.ChatMember.abstracts

import dev.inmo.tgbotapi.types.ChatMember.*
import dev.inmo.tgbotapi.types.User
import dev.inmo.tgbotapi.types.statusField
import dev.inmo.tgbotapi.utils.RiskFeature
import dev.inmo.tgbotapi.utils.nonstrictJsonFormat
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.json.JsonObject
import kotlinx.serialization.json.jsonPrimitive

@Serializable(ChatMemberSerializer::class)
sealed interface ChatMember {
    val user: User
}

@Serializer(ChatMember::class)
@RiskFeature
object ChatMemberSerializer : KSerializer<ChatMember> {
    override val descriptor: SerialDescriptor = JsonObject.serializer().descriptor

    override fun deserialize(decoder: Decoder): ChatMember {
        val json = JsonObject.serializer().deserialize(decoder)
        return when (json[statusField] ?.jsonPrimitive ?.content ?: error("Status field of chat member must be specified, but incoming json contains next: $json")) {
            "creator" -> nonstrictJsonFormat.decodeFromJsonElement(CreatorChatMember.serializer(), json)
            "administrator" -> nonstrictJsonFormat.decodeFromJsonElement(AdministratorChatMemberImpl.serializer(), json)
            "member" -> nonstrictJsonFormat.decodeFromJsonElement(MemberChatMember.serializer(), json)
            "restricted" -> nonstrictJsonFormat.decodeFromJsonElement(RestrictedChatMember.serializer(), json)
            "left" -> nonstrictJsonFormat.decodeFromJsonElement(LeftChatMember.serializer(), json)
            "kicked" -> nonstrictJsonFormat.decodeFromJsonElement(KickedChatMember.serializer(), json)
            else -> error("Unknown type of chat member in json: $json")
        }
    }

    override fun serialize(encoder: Encoder, value: ChatMember) {
        when (value) {
            is CreatorChatMember -> CreatorChatMember.serializer()
            is AdministratorChatMemberImpl -> AdministratorChatMemberImpl.serializer()
            is MemberChatMember -> MemberChatMember.serializer()
            is RestrictedChatMember -> RestrictedChatMember.serializer()
            is LeftChatMember -> LeftChatMember.serializer()
            is KickedChatMember -> KickedChatMember.serializer()
        }
    }
}