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package dev.inmo.micro_utils.startup.plugin

import com.benasher44.uuid.uuid4
import kotlinx.serialization.KSerializer
import kotlinx.serialization.builtins.serializer
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder

object StartPluginSerializer : KSerializer {
    private val registeredPlugins = mutableMapOf()
    private val registeredPluginsByPlugin = mutableMapOf()
    override val descriptor: SerialDescriptor = String.serializer().descriptor

    override fun deserialize(decoder: Decoder): StartPlugin {
        alternativeDeserialize(decoder) ?.let { return it }
        val name = decoder.decodeString()
        return registeredPlugins[name] ?: error("Unable to find startup plugin for $name")
    }

    override fun serialize(encoder: Encoder, value: StartPlugin) {
        if (alternativeSerialize(encoder, value)) {
            return
        }
        val name = registeredPluginsByPlugin[value] ?: uuid4().toString().also {
            registeredPlugins[it] = value
            registeredPluginsByPlugin[value] = it
        }
        encoder.encodeString(name)
    }

    /**
     * Register plugin inside of this [KSerializer]. Since plugin has been registered, you may use its [name] in any
     * serialized [dev.inmo.micro_utils.startup.launcher.Config] to retrieve [plugin] you passed here
     */
    fun registerPlugin(name: String, plugin: StartPlugin) {
        registeredPlugins[name] = plugin
    }
}

internal expect fun alternativeDeserialize(decoder: Decoder): StartPlugin?
internal expect fun alternativeSerialize(encoder: Encoder, value: StartPlugin): Boolean