tgbotapi/TelegramBotAPI-core/src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/update/abstracts/Update.kt

package com.github.insanusmokrassar.TelegramBotAPI.types.update.abstracts

import com.github.insanusmokrassar.TelegramBotAPI.types.UpdateIdentifier
import com.github.insanusmokrassar.TelegramBotAPI.types.update.RawUpdate
import com.github.insanusmokrassar.TelegramBotAPI.utils.nonstrictJsonFormat
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.json.JsonElement

interface Update {
    val updateId: UpdateIdentifier
    val data: Any
}

data class UnknownUpdate(
    override val updateId: UpdateIdentifier,
    override val data: String,
    val rawJson: JsonElement
) : Update

internal object UpdateSerializerWithoutSerialization : KSerializer<Update> {
    override val descriptor: SerialDescriptor = JsonElement.serializer().descriptor

    override fun deserialize(decoder: Decoder): Update = UpdateDeserializationStrategy.deserialize(decoder)

    override fun serialize(encoder: Encoder, value: Update) = throw UnsupportedOperationException()
}

/**
 * Use this object to deserialize objects with type [Update]. Currently it is restricted to use this
 * [DeserializationStrategy] only with JSON
 *
 * @see StringFormat.parse
 * @see kotlinx.serialization.json.Json.parse
 */
object UpdateDeserializationStrategy : DeserializationStrategy<Update> {
    override val descriptor: SerialDescriptor = JsonElement.serializer().descriptor

    override fun deserialize(decoder: Decoder): Update {
        val asJson = JsonElement.serializer().deserialize(decoder)
        return nonstrictJsonFormat.decodeFromJsonElement(
            RawUpdate.serializer(),
            asJson
        ).asUpdate(
            asJson
        )
    }

    override fun patch(decoder: Decoder, old: Update): Update = error("Unsupported operation")
}