Test.kt

fun decide(hand: Hand, casinoCard: Int, firstTurn: Boolean): Decision = when {
    firstTurn && hand.canSplit && hand.cards[0] == 11 -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] == 9 && casinoCard !in listOf(7, 10, 11) -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] == 8 -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] == 7 && casinoCard <= 7 -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] == 6 && casinoCard <= 6 -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] == 4 && casinoCard in 5..6 -> SPLIT
    firstTurn && hand.canSplit && hand.cards[0] in 2..3 && casinoCard <= 7 -> SPLIT
    hand.unusedAces >= 1 && hand.points >= 19 -> STAND
    hand.unusedAces >= 1 && hand.points == 18 && casinoCard < 9 -> STAND
    hand.points > 16 -> STAND
    hand.points > 12 && casinoCard < 4 -> STAND
    hand.points > 11 && casinoCard in 4..6 -> STAND
    hand.unusedAces >= 1 && casinoCard in 2..6 && hand.points >= 18 -> if (firstTurn) DOUBLE else STAND
    hand.unusedAces >= 1 && casinoCard == 3 && hand.points >= 17 -> if (firstTurn) DOUBLE else HIT
    hand.unusedAces >= 1 && casinoCard == 4 && hand.points >= 15 -> if (firstTurn) DOUBLE else HIT
    hand.unusedAces >= 1 && casinoCard in 5..6 -> if (firstTurn) DOUBLE else HIT
    hand.points == 11 -> if (firstTurn) DOUBLE else HIT
    hand.points == 10 && casinoCard < 10 -> if (firstTurn) DOUBLE else HIT
    hand.points == 9 && casinoCard in 3..6 -> if (firstTurn) DOUBLE else HIT
    else -> HIT
}