Chasse 2018: Homebrewed splitwise

chasse2018.sc

val MeatPrice = 95.80
val HipsterMarketPrice = 66.0
val CoopBecauseHipsterMarketDidntHaveEverything = 75.3
val RedWinePackPrice = 136.8
val NbBottlesInPack = 6
val PriceForTwoRedWineBottles = 2 * RedWinePackPrice / NbBottlesInPack

val TotalPaidByTristan = HipsterMarketPrice + CoopBecauseHipsterMarketDidntHaveEverything + RedWinePackPrice

import enumeratum.{ Enum, EnumEntry }
sealed class Human(val alreadyPaid: Double) extends EnumEntry

object Human extends Enum[Human] {
  val values = findValues

  case object Fouki extends Human(MeatPrice)
  // Tristan and Gaspard each kept two red wine bottles
  case object Tristan extends Human(TotalPaidByTristan - PriceForTwoRedWineBottles)
  case object Gaspard extends Human(-PriceForTwoRedWineBottles)
  case object Fred extends Human(0)
  case object Yoann extends Human(0)
  case object Audrey extends Human(0)
  case object Ariane extends Human(0)
}

import Human._

val totalPaid = HipsterMarketPrice + CoopBecauseHipsterMarketDidntHaveEverything + PriceForTwoRedWineBottles + MeatPrice
val pricePerHuman = totalPaid / values.size

val deltas = values.map { participant =>
  val personalBalance = pricePerHuman - participant.alreadyPaid
  val verbToUse = if (personalBalance > 0) "must pay" else "is owed"
  println(f"$participant $verbToUse ${Math.abs(personalBalance)}%.2f CHF.")
  personalBalance
}

require(deltas.sum < 0.001, "Depbts and credits must amount to 0 (or close to it because of floating point precision)!")