package ru.dbotthepony.kstarbound.defs

import com.google.gson.JsonSyntaxException
import com.google.gson.TypeAdapter
import com.google.gson.stream.JsonReader
import com.google.gson.stream.JsonToken
import com.google.gson.stream.JsonWriter

data class MaterialReference(
	val id: Int?,
	val name: String?
) {
	init {
		require(id != null || name != null) { "At least ID or material string ID should be not null" }
	}

	companion object : TypeAdapter<MaterialReference>() {
		override fun write(out: JsonWriter, value: MaterialReference) {
			if (value.id != null) {
				out.value(value.id)
			} else {
				out.value(value.name!!)
			}
		}

		override fun read(`in`: JsonReader): MaterialReference {
			if (`in`.peek() == JsonToken.NUMBER) {
				return MaterialReference(id = `in`.nextInt(), name = null)
			} else if (`in`.peek() == JsonToken.STRING) {
				return MaterialReference(id = null, name = `in`.nextString())
			} else {
				throw JsonSyntaxException("Invalid material reference: ${`in`.peek()} (must be either an Integer or String), near ${`in`.path}")
			}
		}
	}
}