1 files changed, 98 insertions, 0 deletions
diff --git a/internal/casino/baccarat_variants.go b/internal/casino/baccarat_variants.go
new file mode 100644
index 0000000..95b5041
--- /dev/null
+++ b/internal/casino/baccarat_variants.go
@@ -0,0 +1,98 @@
+package casino
+
+import "strings"
+
+const (
+	BaccaratCommission = "commission"
+	BaccaratSuper6     = "super_6"
+	BaccaratEZ         = "ez_baccarat"
+)
+
+// Optional wagers use fixed, conventional profit odds. They are evaluated
+// independently of the main Banker wager (notably the EZ Dragon 7 push).
+func (c BaccaratConfig) spots() []string {
+	spots := []string{baccaratSpotPlayer, baccaratSpotBanker, baccaratSpotTie}
+	if c.PairBets {
+		spots = append(spots, "player_pair", "banker_pair")
+	}
+	if c.Dragon7 {
+		spots = append(spots, "dragon_7")
+	}
+	if c.Panda8 {
+		spots = append(spots, "panda_8")
+	}
+	if c.Super6Bet {
+		spots = append(spots, "super_6")
+	}
+	return spots
+}
+
+func (c BaccaratConfig) allowsSpot(spot string) bool {
+	for _, allowed := range c.spots() {
+		if spot == allowed {
+			return true
+		}
+	}
+	return false
+}
+
+func (c BaccaratConfig) betChoices() string { return strings.Join(c.spots(), "|") }
+
+func baccaratPair(hand []card) bool {
+	return len(hand) >= 2 && hand[0].rank == hand[1].rank
+}
+
+// settleBaccaratHand needs the complete hands: totals alone cannot identify
+// a three-card seven/eight or an initial pair.
+func settleBaccaratHand(spot string, bet int, player, banker []card, rules BaccaratConfig) (string, int, error) {
+	rules = rules.Normalize()
+	if !rules.allowsSpot(spot) {
+		return "loss", 0, nil
+	}
+	pt, bt := baccaratTotal(player), baccaratTotal(banker)
+	win, odds := false, 0.0
+	switch spot {
+	case "player_pair":
+		win, odds = baccaratPair(player), 11
+	case "banker_pair":
+		win, odds = baccaratPair(banker), 11
+	case "dragon_7":
+		win, odds = bt > pt && bt == 7 && len(banker) == 3, 40
+	case "panda_8":
+		win, odds = pt > bt && pt == 8 && len(player) == 3, 25
+	case "super_6":
+		win, odds = bt > pt && bt == 6, 12
+	default:
+		if spot == baccaratSpotBanker && bt > pt {
+			if rules.Variant == BaccaratEZ && bt == 7 && len(banker) == 3 {
+				return "push", bet, nil
+			}
+			if rules.Variant == BaccaratSuper6 && bt == 6 {
+				// Floor the total return, not a positive-profit minimum: a one-credit
+				// stake returns one credit, not two, on this half-pay outcome.
+				payout, err := MulPayout(bet, 1.5)
+				return "win", payout, err
+			}
+		}
+		return settleBaccaratBet(spot, bet, pt, bt, rules)
+	}
+	if !win {
+		return "loss", 0, nil
+	}
+	payout, err := MulPayout(bet, 1+odds)
+	return "win", payout, err
+}
+
+func baccaratVariantOutcome(player, banker []card, rules BaccaratConfig) string {
+	pt, bt := baccaratTotal(player), baccaratTotal(banker)
+	if bt <= pt {
+		return ""
+	}
+	if rules.Variant == BaccaratEZ && bt == 7 && len(banker) == 3 {
+		return "EZ Baccarat: Banker wins with a three-card 7. Banker bets push; Player bets lose."
+	}
+	if rules.Variant == BaccaratSuper6 && bt == 6 {
+		return "Super 6: Banker wins with 6. Banker bets pay 1:2."
+	}
+	return ""
+}