DslExample.scala

package com.example

import java.time.{Duration, ZonedDateTime}

trait Customer
trait Priority
trait OvenState

trait Cooker {
  def cook(customer: Customer, deliveryTime: ZonedDateTime, priority: Priority): Boolean
}

object CookieNames extends Enumeration {
  type CookieName = Value

  val GingerSnaps, ChocolateChip = Value
}

import CookieNames.CookieName

abstract class CookieCooker(overState: OvenState, cookingTime: Duration, name: CookieName) extends Cooker

class DelegatingCookieCooker(overState: OvenState, cookingTime: Duration, name: CookieName)(cookFn: (Customer, ZonedDateTime, Priority) => Boolean) extends CookieCooker(overState, cookingTime, name) {
  def cook(customer: Customer, deliveryTime: ZonedDateTime, priority: Priority): Boolean = cookFn(customer, deliveryTime, priority)
}

object DslExample extends App {
  def addCooker(cooker: Cooker): Unit = ???

  def addCooker(overState: OvenState, cookingTime: Duration, name: CookieName)(cookFn: (Customer, ZonedDateTime, Priority) => Boolean): Unit = addCooker(new DelegatingCookieCooker(overState, cookingTime, name)(cookFn))

  def getOvenState(): OvenState = ???

  val cookingTime = Duration.ofMinutes(10)

  addCooker(new CookieCooker(getOvenState(), cookingTime, CookieNames.GingerSnaps) {
    override def cook(customer: Customer, deliveryTime: ZonedDateTime, priority: Priority): Boolean = {
      // Use `customer`, `deliveryTime` and `priority` to cook a cookie and return true if successful.
      ???
    }
  })

  addCooker(getOvenState(), cookingTime, CookieNames.GingerSnaps) { (customer, deliveryTime, priority) =>
    true
  }

  val addCookersX = addCooker(getOvenState(), cookingTime, CookieNames.GingerSnaps)(_)

  addCookersX { (customer, deliveryTime, priority) =>
    true
  }
}