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package casino
import (
"math/rand"
"strings"
"testing"
)
// TestRouletteCallBetMath checks the four French call bets against the
// traditional chip placements: each component returns exactly 36/covered, so
// the whole wager keeps the wheel's normal house edge.
func TestRouletteCallBetMath(t *testing.T) {
if len(rouletteCallBets) != 4 {
t.Fatalf("want four call bets, got %d", len(rouletteCallBets))
}
for _, bet := range rouletteCallBets {
// The display series must be exactly the pockets the chips cover.
covered := map[string]bool{}
for _, part := range bet.parts {
for _, p := range part.pockets {
covered[p] = true
}
}
if len(bet.series) != len(covered) {
t.Fatalf("%s: series %d pockets, chips cover %d", bet.name, len(bet.series), len(covered))
}
for _, p := range bet.series {
if !covered[p] {
t.Fatalf("%s: series lists %s which no chip covers", bet.name, p)
}
}
// Chips and shares are internally consistent.
chips := 0
for _, part := range bet.parts {
chips += part.chips
}
if chips != bet.chips {
t.Fatalf("%s: parts total %d chips, want %d", bet.name, chips, bet.chips)
}
wager := bet.wager()
den := 0
sum := 0
for _, share := range wager.shares {
if den == 0 {
den = share.den
}
if share.den != den {
t.Fatalf("%s: mixed share denominators %d and %d", bet.name, den, share.den)
}
sum += share.num
}
if sum != 36*den {
t.Fatalf("%s: returns sum to %d/%d, want 36", bet.name, sum, den)
}
if got := len(wager.shares); got != len(covered) {
t.Fatalf("%s: wager covers %d pockets, want %d", bet.name, got, len(covered))
}
}
}
// TestRouletteCallBetAliases checks that the shorthand and full names reach the
// same wager, and that they require a racetrack single-zero table.
func TestRouletteCallBetAliases(t *testing.T) {
for _, tc := range []struct {
syntax []string
name string
}{
{[]string{"voisins", "voisins du zero", "Voisins du Zéro", "vdz", "grands voisins du zero"}, "voisins"},
{[]string{"tiers", "tiers du cylindre", "le tiers du cylindre", "tdc"}, "tiers"},
{[]string{"orphelins", "orphans", "les orphelins"}, "orphelins"},
{[]string{"zero spiel", "zerospiel", "spiel", "jeu zero", "zero game"}, "zerospiel"},
} {
var want rouletteWager
for _, bet := range rouletteCallBets {
if bet.canonical == tc.name {
want = bet.wager()
}
}
for _, syntax := range tc.syntax {
got, ok := rouletteWagerFor(syntax, false, true)
if !ok {
t.Fatalf("racetrack %q not resolved", syntax)
}
if len(got.shares) != len(want.shares) {
t.Fatalf("%q: %d pockets, want %d", syntax, len(got.shares), len(want.shares))
}
for pocket, share := range want.shares {
if got.shares[pocket] != share {
t.Fatalf("%q pocket %s: %s, want %s", syntax, pocket, formatShare(got.shares[pocket]), formatShare(share))
}
}
// The same name on a table without the racetrack option is unknown.
if _, ok := rouletteWagerFor(syntax, false, false); ok {
t.Fatalf("%q resolved with racetrack disabled", syntax)
}
// Double-zero tables never offer the call bets.
if _, ok := rouletteWagerFor(syntax, true, true); ok {
t.Fatalf("%q resolved on a double-zero table", syntax)
}
}
}
}
// TestRouletteCallBetPayouts pins the per-pocket returns, including the
// Orphelins number covered by two splits and the floor on non-divisible
// stakes.
func TestRouletteCallBetPayouts(t *testing.T) {
wager := func(syntax string) rouletteWager {
w, ok := rouletteWagerFor(syntax, false, true)
if !ok {
t.Fatalf("cannot resolve %q", syntax)
}
return w
}
payout := func(w rouletteWager, pocket string, stake int) int {
share, ok := w.covers(pocket)
if !ok {
t.Fatalf("pocket %s not covered", pocket)
}
got, err := share.payout(stake)
if err != nil {
t.Fatal(err)
}
return got
}
// Voisins: the 0/2/3 trio returns 24/9 of the stake, splits 18/9.
voisins := wager("voisins")
if got := payout(voisins, "0", 9); got != 24 {
t.Fatalf("voisins 9 on 0 = %d, want 24", got)
}
if got := payout(voisins, "3", 9); got != 24 {
t.Fatalf("voisins 9 on 3 = %d, want 24", got)
}
if got := payout(voisins, "4", 9); got != 18 {
t.Fatalf("voisins 9 on 4 = %d, want 18", got)
}
if got := payout(voisins, "25", 9); got != 18 {
t.Fatalf("voisins 9 on 25 = %d, want 18", got)
}
// A stake the chip count does not divide floors, never rounds up.
if got := payout(voisins, "0", 10); got != 26 {
t.Fatalf("voisins 10 on 0 = %d, want 26", got)
}
// Orphelins: 1 and 17 (two winning splits) pay 36/5, the rest 18/5.
orphelins := wager("orphelins")
if got := payout(orphelins, "1", 5); got != 36 {
t.Fatalf("orphelins 5 on 1 = %d, want 36", got)
}
if got := payout(orphelins, "17", 5); got != 36 {
t.Fatalf("orphelins 5 on 17 = %d, want 36", got)
}
if got := payout(orphelins, "6", 5); got != 18 {
t.Fatalf("orphelins 5 on 6 = %d, want 18", got)
}
// Zero Spiel: 26 is the straight-up.
spiel := wager("zero spiel")
if got := payout(spiel, "26", 4); got != 36 {
t.Fatalf("zero spiel 4 on 26 = %d, want 36", got)
}
if got := payout(spiel, "0", 4); got != 18 {
t.Fatalf("zero spiel 4 on 0 = %d, want 18", got)
}
// Tiers is a plain six-way split.
tiers := wager("tiers")
if got := payout(tiers, "5", 6); got != 18 {
t.Fatalf("tiers 6 on 5 = %d, want 18", got)
}
}
// TestRouletteNeighbors checks the neighbours bet covers the chosen number and
// four each side in wheel order, one chip on each, and rejects malformed
// targets.
func TestRouletteNeighbors(t *testing.T) {
wheel := rouletteWheel(false)
if len(wheel) != 37 {
t.Fatal("unexpected wheel size")
}
index := 0
for i, p := range wheel {
if p == "17" {
index = i
}
}
for _, syntax := range []string{"neighbors 17", "neighbors of 17", "neighbours 17", "17 neighbors"} {
wager, ok := rouletteWagerFor(syntax, false, true)
if !ok {
t.Fatalf("%q not resolved", syntax)
}
if len(wager.shares) != 9 {
t.Fatalf("%q covers %d pockets, want 9", syntax, len(wager.shares))
}
for d := -neighborsRadius; d <= neighborsRadius; d++ {
want := wheel[(index+d+len(wheel))%len(wheel)]
share, ok := wager.covers(want)
if !ok {
t.Fatalf("%q missing wheel neighbour %s", syntax, want)
}
if share != (rouletteShare{num: 36, den: 9}) {
t.Fatalf("%q pocket %s share %s, want 36/9", syntax, want, formatShare(share))
}
}
}
for _, syntax := range []string{"neighbors", "neighbors 37", "neighbors 1 2", "neighbors 00"} {
if _, ok := rouletteWagerFor(syntax, false, true); ok {
t.Fatalf("%q should not resolve", syntax)
}
}
// Neighbours needs the racetrack option and a single-zero wheel.
if _, ok := rouletteWagerFor("neighbors 17", false, false); ok {
t.Fatal("neighbors resolved with racetrack disabled")
}
if _, ok := rouletteWagerFor("neighbors 17", true, true); ok {
t.Fatal("neighbors resolved on a double-zero table")
}
// A bare number is still a straight-up, not a neighbours bet.
if _, ok := rouletteWagerFor("17", false, true); !ok {
t.Fatal("straight 17 no longer resolves")
}
}
// TestRouletteRacetrackSettlement drives a call bet through the real table
// phases and checks the exact per-pocket payout for the sampled winner.
func TestRouletteRacetrackSettlement(t *testing.T) {
table := newRouletteTable(1, TableConfig{ID: "r", Game: GameRoulette, BettingTicks: 2, Roulette: RouletteConfig{Racetrack: true, SpinTicks: 2}}, rand.New(rand.NewSource(7)))
wheel := rouletteWheel(false)
index := rand.New(rand.NewSource(7)).Intn(len(wheel))
pocket := wheel[index]
// Voisins, Tiers and Orphelins partition the wheel, so one covers it.
syntax := ""
var share rouletteShare
for _, bet := range rouletteCallBets {
if s, ok := bet.wager().covers(pocket); ok {
syntax, share = bet.canonical, s
break
}
}
if syntax == "" {
t.Fatal("no call bet covers pocket ", pocket)
}
table.join("a")
w := &testWallet{chips: 100}
table.bet("a", syntax, 10, w)
for i := 0; i < 4; i++ {
table.tick()
}
want, err := share.payout(10)
if err != nil {
t.Fatal(err)
}
if w.paid != want || len(w.open) != 0 {
t.Fatalf("%q pocket %s: paid %d, want %d (%+v)", syntax, pocket, w.paid, want, w)
}
}
// TestRouletteRacetrackConfig rejects a racetrack on the American wheel.
func TestRouletteRacetrackConfig(t *testing.T) {
cfg := TableConfig{ID: "r", Game: GameRoulette, Roulette: RouletteConfig{Racetrack: true}}
if err := cfg.Validate(); err != nil {
t.Fatalf("single-zero racetrack rejected: %v", err)
}
cfg.Roulette.DoubleZero = true
if err := cfg.Validate(); err == nil || !strings.Contains(err.Error(), "single-zero") {
t.Fatalf("double-zero racetrack accepted: %v", err)
}
}
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