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package casino
import "fmt"
// CrapsConfig selects explicit house rules and the shared wager limits.
type CrapsConfig struct {
Odds int `yaml:"odds,omitempty"` // 0 = 3-4-5x; positive = uniform Nx
Field12 int `yaml:"field_12,omitempty"`
Variant string `yaml:"variant,omitempty"`
}
func (c CrapsConfig) Normalize() CrapsConfig {
if c.Field12 == 0 {
c.Field12 = 2
}
return c
}
func validateCraps(c TableConfig) error {
if c.Craps.Odds < 0 || c.Craps.Odds > 1000000 {
return fmt.Errorf("craps odds must be 0 (3-4-5x) or 1..1000000")
}
if c.Craps.Field12 != 0 && c.Craps.Field12 != 2 && c.Craps.Field12 != 3 {
return fmt.Errorf("craps field_12 must be 2 or 3")
}
switch c.Craps.variant() {
case "bank", "simplified", "high_point", "crapless", "new_york", "die_rich", "diceless":
default:
return fmt.Errorf("unknown craps variant %q", c.Craps.Variant)
}
if !c.Craps.allows("odds") && c.Craps.Odds != 0 {
return fmt.Errorf("this craps variant does not support odds")
}
return nil
}
func crapsNumber(n int) bool { return n == 4 || n == 5 || n == 6 || n == 8 || n == 9 || n == 10 }
func crapsTrueOdds(n int) (int, int) {
switch n {
case 2, 12:
return 6, 1
case 3, 11:
return 3, 1
case 4, 10:
return 2, 1
case 5, 9:
return 3, 2
default:
return 6, 5
}
}
func (c CrapsConfig) oddsLimit(n int, against bool) int {
if c.Odds > 0 {
return c.Odds
}
if c.variant() == "crapless" && !crapsNumber(n) {
return 1
}
if against {
return 6
}
switch n {
case 4, 10:
return 3
case 5, 9:
return 4
default:
return 5
}
}
func (c TableConfig) CrapsRulesText() string {
r := c.Craps.Normalize()
if r.variant() != "bank" && r.variant() != "diceless" {
return r.variantRulesText()
}
prefix := ""
if r.variant() == "diceless" {
prefix = "Diceless Craps — bank rules using cards, not dice. Two independent six-card packs labelled 1-6; draw one from each, replace and reshuffle BOTH after EVERY roll. All 36 ordered pairs are equally likely. No finite shoe or card counting.\n"
}
odds := "3-4-5x (don't: 6x laid)"
if r.Odds > 0 {
odds = fmt.Sprintf("%dx", r.Odds)
}
return prefix + fmt.Sprintf("Bank Craps | Free odds %s | Field 12 pays %d:1\n"+
"bet <amount> on pass / dontpass / come / dontcome / field\n"+
"bet <amount> on place 6 / buy 4 / lay 10 / hard 8 / hop 2 3\n"+
"bet <amount> on seven / craps / eleven / ace-deuce / aces / boxcars / horn\n"+
"bet <amount> on odds pass / odds come 6 (also dontpass/dontcome)\n"+
"bet <amount> on fire / small / tall / all (before shooter's first roll only)\n"+
"Pass/come 1:1; don't bars 12. Place 4/10 9:5, 5/9 7:5, 6/8 7:6.\n"+
"Buy/lay true odds; 5%% commission on buy STAKE / lay WIN, rounded up, wins only.\n"+
"Field 2 pays 2:1; 3/4/9/10/11 pay 1:1. Hard 4/10 7:1; 6/8 9:1.\n"+
"Seven 4:1; craps 7:1; 11/3 15:1; 2/12 30:1; hop easy 15:1, hard 30:1.\n"+
"Horn splits equally across 2/3/11/12. Fire: 4/5/6 distinct made points pay 24/249/999:1.\n"+
"Small (2-6) / Tall (8-12) pay 34:1; All pays 175:1. Any 7 resets ATS.\n"+
"Place/buy/hard and come odds are OFF on come-out; lay and don't odds work.\n"+
"Exact payout units required; no fractional-credit rounding except commission.\n"+
"Solo: roll anytime. Multiplayer: 10 seconds to bet, then 60 seconds for the shooter.\n"+
"Bets remain open until the roll. Dice rotate on seven-out.\n"+
"autoroll: repeat every 3 seconds on your turn (multiplayer waits 10 seconds).\n"+
"unbet: remove every non-contract bet and all free odds; pass/come contracts stay.\n"+
"stop cancels autoroll without leaving; in manual mode stop waits for live bets.\n"+
"Disconnect forfeits live bets.\n"+
"Winning bets return stake and are removed (no automatic pressing).", odds, r.Field12)
}
// outcome returns resolved and profit numerator/denominator; -1 means loss.
func crapsOutcome(kind string, n, a, b, point, field12 int) (bool, int, int) {
s := a + b
hard := a == b
switch kind {
case "pass", "come", "dontpass", "dontcome":
against := kind == "dontpass" || kind == "dontcome"
if n == 0 {
if against {
switch s {
case 2, 3:
return true, 1, 1
case 7, 11:
return true, -1, 1
case 12:
return true, 0, 1
}
} else {
switch s {
case 7, 11:
return true, 1, 1
case 2, 3, 12:
return true, -1, 1
}
}
return false, 0, 1
}
if s != 7 && s != n {
return false, 0, 1
}
if (s == n) != against {
return true, 1, 1
}
return true, -1, 1
case "place", "buy", "lay":
if point == 0 && kind != "lay" {
return false, 0, 1
}
if s != 7 && s != n {
return false, 0, 1
}
if (s == 7) != (kind == "lay") {
return true, -1, 1
}
x, y := crapsTrueOdds(n)
if kind == "lay" {
x, y = y, x
}
if kind == "place" {
x, y = crapsPlaceOdds(n)
}
return true, x, y
case "hard":
if point == 0 {
return false, 0, 1
}
if s == 7 || (s == n && !hard) {
return true, -1, 1
}
if s == n {
if n == 4 || n == 10 {
return true, 7, 1
}
return true, 9, 1
}
return false, 0, 1
case "field":
switch s {
case 2:
return true, 2, 1
case 12:
return true, field12, 1
case 3, 4, 9, 10, 11:
return true, 1, 1
}
return true, -1, 1
case "seven":
if s == 7 {
return true, 4, 1
}
case "craps":
if s == 2 || s == 3 || s == 12 {
return true, 7, 1
}
case "eleven", "ace-deuce":
if (kind == "eleven" && s == 11) || (kind == "ace-deuce" && s == 3) {
return true, 15, 1
}
case "aces", "boxcars":
if (kind == "aces" && s == 2) || (kind == "boxcars" && s == 12) {
return true, 30, 1
}
case "hop":
if a*10+b == n || b*10+a == n {
if hard {
return true, 30, 1
}
return true, 15, 1
}
case "horn":
switch s {
case 2, 12:
return true, 27, 4
case 3, 11:
return true, 3, 1
}
default:
return false, 0, 1
}
return true, -1, 1
}
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