class InvestmentProfile(val rate: Double, val periods: Int)

class InvestmentCalculator:
  // the value of an investment of $principle after specified years
  def value(principle: Double, years: Int)(using fc: InvestmentProfile) =
    var result = principle
    val rate2 = fc.rate / fc.periods
    for(i <- 0 until years * fc.periods)
      result += rate2 * result
    result


object scenario extends InvestmentCalculator with App :
  // 100% annual rate compounded monthly
  val profile1 = InvestmentProfile(1, 12)
  // 100% annual rate compounded daily
  val profile2 = InvestmentProfile(1, 365)
  // the default profile
  given InvestmentProfile = profile1
  // investing $1 for 1 year
  val payoff1 = value(1, 1)
  val payoff2 = value(1, 1)(using profile2)
  println("payoff1 = $" + payoff1) // $2.613035290224677
  println("payoff1 = $" + payoff2) // $2.714567482021875