package blackjack

// ParseCard returns the integer value of a card following blackjack ruleset.
func ParseCard(card string) int {
    switch card {
        case "ace":
            return 11
        case "two":
            return 2
        case "three":
            return 3
        case "four":
            return 4
        case "five":
            return 5
        case "six":
            return 6
        case "seven":
            return 7
        case "eight":
            return 8
        case "nine":
            return 9
        case "ten", "jack", "queen", "king":
            return 10
        default:
            return 0
    }
}

// IsBlackjack returns true if the player has a blackjack, false otherwise.
func IsBlackjack(card1, card2 string) bool {
    return ParseCard(card1) + ParseCard(card2) == 21
}

// LargeHand implements the decision tree for hand scores larger than 20 points.
func LargeHand(isBlackjack bool, dealerScore int) string {
    if !isBlackjack {
        // Must have two aces
        return "P"
    } else if isBlackjack && dealerScore < 10 {
        return "W"
    }
    return "S"
}

// SmallHand implements the decision tree for hand scores with less than 21 points.
func SmallHand(handScore, dealerScore int) string {
    if handScore >= 17 {
        return "S"
    } else if handScore <= 11 || dealerScore >= 7 {
        return "H"
    }
    return "S"
}