package ru.dbotthepony.kstarbound.json.builder

import com.google.gson.Gson
import com.google.gson.TypeAdapter
import com.google.gson.reflect.TypeToken
import ru.dbotthepony.kstarbound.util.KOptional
import kotlin.properties.Delegates
import kotlin.reflect.KMutableProperty1
import kotlin.reflect.KProperty1
import kotlin.reflect.KType
import kotlin.reflect.javaType

open class ReferencedProperty<T : Any, V>(
	property: KProperty1<T, V>,
	val isFlat: Boolean,
	val mustBePresent: Boolean? = null,
	val isIgnored: Boolean = false,
	isMarkedNullable: Boolean? = null,
) {
	@Suppress("CanBePrimaryConstructorProperty")
	open val property: KProperty1<T, V> = property

	val name: String get() = property.name
	var adapter: TypeAdapter<V> by Delegates.notNull()
		private set

	val type: KType = property.returnType
	val isMarkedNullable: Boolean = isMarkedNullable?.also {
		if (it && !type.isMarkedNullable) throw IllegalArgumentException("Can't declare non-null property as nullable")
	} ?: type.isMarkedNullable

	operator fun component1() = property
	operator fun component2() = adapter

	private var isResolved = false

	@OptIn(ExperimentalStdlibApi::class)
	@Suppress("DEPRECATION")
	fun resolve(gson: Gson) {
		if (!isResolved) {
			isResolved = true
			val token = TypeToken.get(type.javaType)

			if (token.rawType === KOptional::class.java && type.arguments.size == 1) {
				val subtype = type.arguments[0]

				if (subtype.type!!.isMarkedNullable) {
					adapter = gson.getAdapter(TypeToken.getParameterized(KOptional.Nullable::class.java, subtype.type!!.javaType)) as TypeAdapter<V>
				} else {
					adapter = gson.getAdapter(TypeToken.getParameterized(KOptional.NotNull::class.java, subtype.type!!.javaType)) as TypeAdapter<V>
				}
			} else {
				adapter = gson.getAdapter(token) as TypeAdapter<V>
			}
		}
	}
}

class ReferencedMutableProperty<T : Any, V>(override val property: KMutableProperty1<T, V>, isFlat: Boolean, mustBePresent: Boolean?) : ReferencedProperty<T, V>(property, isFlat, mustBePresent) {
	fun set(instance: T, value: Any?) {
		(this.property as KMutableProperty1<T, Any?>).set(instance, value)
	}
}