shapeless

package test

import shapeless.{HNil, Poly1}


object Main extends App {

  sealed trait Product {
    def name: String
    def unitPrice: BigDecimal
  }

  case class Phone(name: String, unitPrice: BigDecimal) extends Product

  case class Accessory(name: String, unitPrice: BigDecimal) extends Product

  trait Pricer[T] {
    def calculatePrice(t: T): BigDecimal
  }

  object StandardPrices extends Poly1 {
    implicit def phonePricer = at[Phone] {
      new Pricer[Phone] {
        def calculatePrice(p: Phone): BigDecimal = p.unitPrice
      }.calculatePrice _
    }

    implicit def accessoryPricer = at[Accessory] {
      new Pricer[Accessory] {
        def calculatePrice(p: Accessory): BigDecimal = p.unitPrice
      }.calculatePrice _
    }
  }

  val card = Phone("Nexus 5", 100.0) :: Accessory("Qi charger", 30) :: HNil

  println(card.map(StandardPrices))

}