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package code
final case class Game(frames: List[Frame], finalFrame: FinalFrame) {
import Game._
def score: Int = {
val state =
frames
.foldLeft(initialState) { (state: State, frame: Frame) =>
state.pending match {
case Some(value) =>
value match {
case Strike =>
frame match {
case Frame.Strike =>
state.next(0, Some(StrikeAndStrike))
case Frame.Spare(roll) =>
state.next(10 + 10, Some(Spare))
case Frame.Open(roll1, roll2) =>
state.next(roll1 + roll2 + (10 + roll1 + roll2), None)
}
case StrikeAndStrike =>
frame match {
case Frame.Strike =>
state.next(30, Some(StrikeAndStrike))
case Frame.Spare(roll) =>
state.next(10 + 10 + roll + (10 + 10), Some(Spare))
case Frame.Open(roll1, roll2) =>
state.next(10 + 10 + roll1 + (10 + roll1 + roll2), None)
}
case Spare =>
frame match {
case Frame.Strike =>
state.next(10 + 10, Some(Strike))
case Frame.Spare(roll) =>
state.next(10 + roll, Some(Spare))
case Frame.Open(roll1, roll2) =>
state.next(10 + roll1 + (roll1 + roll2), None)
}
}
case None =>
frame match {
case Frame.Strike =>
state.next(0, Some(Strike))
case Frame.Spare(roll) =>
state.next(0, Some(Spare))
case Frame.Open(roll1, roll2) =>
state.next(roll1 + roll2, None)
}
}
}
state.pending match {
case Some(value) =>
value match {
case Strike =>
finalFrame match {
case FinalFrame.Strike(bonus1, bonus2) =>
state.score + (10 + 10 + bonus1) + (10 + bonus1 + bonus2)
case FinalFrame.Spare(roll, bonus) =>
state.score + (10 + 10) + (10 + bonus)
case FinalFrame.Open(roll1, roll2) =>
state.score + (10 + roll1 + roll2) + (roll1 + roll2)
}
case StrikeAndStrike =>
finalFrame match {
case FinalFrame.Strike(bonus1, bonus2) =>
state.score + 30 + (10 + 10 + bonus1) + (10 + bonus1 + bonus2)
case FinalFrame.Spare(roll, bonus) =>
state.score + (20 + roll) + (10 + roll) + (10 + bonus)
case FinalFrame.Open(roll1, roll2) =>
state.score + (20 + roll1) + (10 + roll1 + roll2) + (roll1 + roll2)
}
case Spare =>
finalFrame match {
case FinalFrame.Strike(bonus1, bonus2) =>
state.score + 20 + (10 + bonus1 + bonus2)
case FinalFrame.Spare(roll, bonus) =>
state.score + (10 + roll) + (10 + bonus)
case FinalFrame.Open(roll1, roll2) =>
state.score + (10 + roll1) + (roll1 + roll2)
}
}
case None =>
finalFrame match {
case FinalFrame.Strike(bonus1, bonus2) =>
state.score + (10 + bonus1 + bonus2)
case FinalFrame.Spare(roll, bonus) =>
state.score + (10 + bonus)
case FinalFrame.Open(roll1, roll2) =>
state.score + (roll1 + roll2)
}
}
}
}
object Game {
final case class State(
score: Int,
pending: Option[Pending]
) {
def next(additionalScore: Int, newPending: Option[Pending]): State =
this.copy(
score = score + additionalScore,
pending = newPending
)
}
sealed trait Pending extends Product with Serializable
case object Strike extends Pending
case object StrikeAndStrike extends Pending
case object Spare extends Pending
val initialState = State(0, None)
}