package demo

import kotlinx.serialization.Serializable
import kotlinx.serialization.json.Json
import org.joda.money.CurrencyUnit.USD
import org.joda.money.Money

@Serializable
data class Order(val items: List<Int>) {
  fun total(): Money =
    Money.ofMinor(USD, items.sum().toLong())
}

fun main() {
  val json = """{ "items": [2400, 1800, 800] }"""
  val order = Json.decodeFromString<Order>(json)
  val (items) = order
  println("${items.size} items, ${order.total()}")
}