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package casino
import (
"math/rand"
"strconv"
)
// card is a single playing card shared by every card-based table game.
type card struct {
rank string
suit string
}
func (c card) String() string { return c.rank + " of " + c.suit }
// blackjackValue scores aces as 11 and faces as 10.
func (c card) blackjackValue() int {
switch c.rank {
case "A":
return 11
case "K", "Q", "J":
return 10
default:
value, _ := strconv.Atoi(c.rank)
return value
}
}
// baccaratValue scores aces as 1 and faces/tens as 0.
func (c card) baccaratValue() int {
switch c.rank {
case "K", "Q", "J", "10":
return 0
case "A":
return 1
default:
value, _ := strconv.Atoi(c.rank)
return value
}
}
// shoe is a shuffled multi-deck card shoe shared by card table games. It
// reshuffles once the remaining cards fall to the shuffleAt fraction.
type shoe struct {
cards []card
rng *rand.Rand
decks int
shuffleAt float64
}
func newShoe(decks int, shuffleAt float64, rng *rand.Rand) *shoe {
s := &shoe{rng: rng, decks: decks, shuffleAt: shuffleAt}
s.shuffle()
return s
}
func (s *shoe) shuffle() {
ranks := []string{"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"}
suits := []string{"clubs", "diamonds", "hearts", "spades"}
s.cards = make([]card, 0, s.decks*52)
for deck := 0; deck < s.decks; deck++ {
for _, suit := range suits {
for _, rank := range ranks {
s.cards = append(s.cards, card{rank: rank, suit: suit})
}
}
}
s.rng.Shuffle(len(s.cards), func(i, j int) { s.cards[i], s.cards[j] = s.cards[j], s.cards[i] })
}
func (s *shoe) draw() card {
if s.shuffleAt > 0 && len(s.cards) <= int(float64(s.decks*52)*s.shuffleAt) {
s.shuffle()
}
card := s.cards[len(s.cards)-1]
s.cards = s.cards[:len(s.cards)-1]
return card
}
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