path: root/internal/casino/pai_gow_test.go

package casino

import (
	"math"
	"math/rand"
	"reflect"
	"strings"
	"testing"
)

func pgCards(s string) []card {
	var out []card
	for _, v := range strings.Fields(s) {
		if v == "JK" {
			out = append(out, card{"JK", "joker"})
			continue
		}
		suit := map[byte]string{'s': "spades", 'h': "hearts", 'd': "diamonds", 'c': "clubs"}[v[len(v)-1]]
		out = append(out, card{v[:len(v)-1], suit})
	}
	return out
}
func TestPaiGowParsingAndFouls(t *testing.T) {
	for _, s := range []string{"24", "42", "2 4", "13456", "6 5 4 3 1"} {
		d, ok := ParsePaiGowDigits(s)
		if !ok {
			t.Fatal(s)
		}
		split := pgSet(pgCards("As Ah 2c 3d 4s 7h 9c"), d)
		if len(split.high) != 5 || len(split.low) != 2 {
			t.Fatal(split)
		}
	}
	for _, s := range []string{"", "2", "123", "1234", "123456", "1234567", "22", "11234", "08", "28", "-24", "2x4"} {
		if _, ok := ParsePaiGowDigits(s); ok {
			t.Fatalf("accepted %q", s)
		}
	}
	cards := pgCards("As Ah 2c 3d 4s 7h 9c")
	if pgSet(cards, []int{0, 1}).valid() {
		t.Fatal("pair low above high-card high")
	}
	if !pgSet(cards, []int{5, 6}).valid() {
		t.Fatal("legal pair high")
	}
	if !reflect.DeepEqual(pgSet(cards, []int{1, 3}), pgSet(cards, []int{0, 2, 4, 5, 6})) {
		t.Fatal("complement selection differs")
	}
}
func TestPaiGowRanksAndBug(t *testing.T) {
	cases := []struct {
		cards string
		rank  pgRank
	}{
		{"As Ah", pgRank{1, 14}}, {"JK Kh", pgRank{0, 14, 13}},
		{"Ks Qh Jc 10d 9s", pgRank{4, 13}}, {"As 2h 3c 4d 5s", pgRank{4, 15}}, {"As Kh Qc Jd 10s", pgRank{4, 16}},
		{"Ks Kh Kd JK 2s", pgRank{3, 13, 14, 2}}, // Joker cannot become a fourth king.
		{"As Ah Ad Ac JK", pgRank{9, 14}},
		{"2h 5h 8h Kh JK", pgRank{5, 14, 13, 8, 5, 2}},
		{"10s Js Qs Ks JK", pgRank{8, 16}}, {"As 2h 3c 4d JK", pgRank{4, 15}},
	}
	for _, tt := range cases {
		if got := pgEvaluate(pgCards(tt.cards)); got != tt.rank {
			t.Errorf("%s = %v want %v", tt.cards, got, tt.rank)
		}
	}
}
func TestPaiGowFortuneCategories(t *testing.T) {
	cases := []struct {
		cards, hand string
		odds        int
	}{
		{"2s 3s 4s 5s 6s 7s 8s", "Natural seven-card straight flush", 1000},
		{"As 2s 3s 4s 5s 6s 7s", "Natural seven-card straight flush", 1000},
		{"10s Js Qs Ks As Kh Qh", "Royal flush + royal match", 750},
		{"10s Js Qs Ks JK Kh Qh", "Royal flush + royal match", 750},
		{"2s 3s 4s 5s 6s 8s JK", "Wild seven-card straight flush", 500},
		{"As Ah Ac Ad JK 2c 3s", "Five aces", 250},
		{"10s Js Qs Ks As 2h 3d", "Royal flush", 150},
		{"2s 3s 4s 5s 6s 8h 9d", "Straight flush", 50},
		{"Ks Kh Kc Kd 2s 3c JK", "Four of a kind", 25},
		{"Ks Kh Kc Qd Qs 3c 8h", "Full house", 5},
		{"2s 4s 6s 8s Ks 3h 9d", "Flush", 4},
		{"2s 3h 4c 5d 6s 6h 6c", "Three of a kind", 3}, // trips outrank straight for Fortune
		{"2s 3h 4c 5d 6s 9h Kc", "Straight", 2},
		{"As Ah Kc Kd 2s 2h 7c", "Three pair", 1},
		{"2s 4h 6c 8d Js Qh Ac", "No Fortune win", 0},
	}
	for _, tt := range cases {
		row, win := pgFortune(pgCards(tt.cards), true)
		if row.Hand != tt.hand || row.Odds != tt.odds || win != (tt.odds > 0) {
			t.Errorf("%s: %+v %v", tt.cards, row, win)
		}
	}
	rows := FortunePayTable(false)
	if rows[6].Odds != 30 {
		t.Fatal(rows)
	}
	for _, r := range rows {
		if r.Envy != 0 {
			t.Fatal(r)
		}
	}
}

// Published category combination counts also check that the effective
// schedules and the documented theoretical edges cannot silently drift.
func TestPaiGowFortunePublishedEdge(t *testing.T) {
	counts := []int{32, 72, 196, 1128, 26020, 184644, 307472, 4188528, 6172088, 7672500, 11034204, 2862000}
	for _, envy := range []bool{false, true} {
		profit := -121694196
		for i, row := range FortunePayTable(envy) {
			profit += row.Odds * counts[i]
		}
		edge := -float64(profit) / 154143080
		want := 0.034318
		if envy {
			want = 0.044292
		}
		if math.Abs(edge-want) > 0.000001 {
			t.Fatalf("envy %v edge %g", envy, edge)
		}
	}
}
func TestPaiGowHouseNeverFouls(t *testing.T) {
	rng := rand.New(rand.NewSource(21))
	for n := 0; n < 500; n++ {
		deck := newShoe(1, 0, rng)
		cards := append([]card(nil), deck.cards[:7]...)
		if n%2 == 0 {
			cards[0] = card{"JK", "joker"}
		}
		s := pgHouse(cards)
		if !s.valid() {
			t.Fatalf("foul %v: %+v", cards, s)
		}
		if !reflect.DeepEqual(s, pgHouse(cards)) {
			t.Fatal("nondeterministic house way")
		}
	}
	s := pgHouse(pgCards("As Ah Ks Kh 2s 4h 7c"))
	if pgEvaluate(s.low)[0] != 1 || pgEvaluate(s.high)[0] != 1 {
		t.Fatal("house should split two pair", s)
	}
}
func TestPaiGowVariants(t *testing.T) {
	dealer := pgSplit{high: pgCards("Ks Kh 8s 7d 2c"), low: pgCards("Qs Jh")}
	win := pgSplit{high: pgCards("As Ah 8h 6d 3c"), low: pgCards("Ks Qh")}
	split := pgSplit{high: win.high, low: pgCards("10s 9h")}
	for _, variant := range []string{PaiGowClassic, PaiGowEZ, PaiGowNoPush} {
		if pgMainResult(win, dealer, append(append([]card(nil), dealer.high...), dealer.low...), variant, [2]card{}) != "win" {
			t.Fatal(variant)
		}
	}
	if pgMainResult(dealer, dealer, nil, PaiGowClassic, [2]card{}) != "loss" {
		t.Fatal("copies must lose")
	}
	if pgMainResult(split, dealer, nil, PaiGowClassic, [2]card{}) != "push" {
		t.Fatal("split should push")
	}
	for _, tt := range []struct{ cards, result string }{{"Ks Qh", "win (tiebreaker)"}, {"Ks Kh", "loss (tiebreaker)"}, {"JK As", "loss (tiebreaker)"}, {"JK Ks", "win (tiebreaker)"}} {
		cards := pgCards(tt.cards)
		if got := pgMainResult(split, dealer, nil, PaiGowNoPush, [2]card{cards[0], cards[1]}); got != tt.result {
			t.Fatal(tt, got)
		}
	}
	queen := pgCards("Qs Jh 9c 8d 6s 4h 2c")
	if got := pgMainResult(win, dealer, queen, PaiGowEZ, [2]card{}); got != "push (dealer queen-high)" {
		t.Fatal(got)
	}
	if pgMainPay(20, "win", PaiGowClassic) != 39 || pgMainPay(20, "win", PaiGowEZ) != 40 || pgMainPay(20, "push", PaiGowEZ) != 20 || pgMainPay(20, "loss", PaiGowClassic) != 0 {
		t.Fatal("wrong payout")
	}
}
func pgTestTable(envy bool) *paiGowTable {
	cfg := TableConfig{ID: "pg", Game: GamePaiGow, BettingTicks: 2, PaiGow: PaiGowConfig{Envy: envy, ActionTicks: 2}}.Normalize()
	return newPaiGowTable(1, cfg, rand.New(rand.NewSource(3))).(*paiGowTable)
}
func TestPaiGowLifecyclePrivacyAndUniqueDeck(t *testing.T) {
	tab := pgTestTable(true)
	wallets := map[string]*testWallet{}
	for _, name := range []string{"a", "b", "c", "d", "e", "f"} {
		tab.join(name)
		wallets[name] = &testWallet{chips: 100}
	}
	var events []Event
	for _, name := range []string{"a", "b", "c", "d", "e", "f"} {
		w := wallets[name]
		// Side bets settle before the main wager; the last main bet deals.
		tab.bet(name, "fortune", 5, w)
		events = tab.bet(name, "main", 10, w)
	}
	tab.join("overflow")
	if tab.hasParticipant("overflow") {
		t.Fatal("seventh seat")
	}
	if tab.phase != "setting" {
		t.Fatal(tab.phase)
	}
	seen := map[card]bool{}
	for _, p := range tab.players {
		for _, c := range p.cards {
			if seen[c] {
				t.Fatal("duplicate", c)
			}
			seen[c] = true
		}
	}
	for _, c := range append(append([]card(nil), tab.dealer...), tab.tie[:]...) {
		if seen[c] {
			t.Fatal("duplicate", c)
		}
		seen[c] = true
	}
	if len(seen) != 51 {
		t.Fatal(len(seen))
	}
	for _, e := range events {
		if e.Snapshot == nil {
			continue
		}
		if e.Public || e.PrivateTo == "" {
			t.Fatal("private cards leaked")
		}
		s := e.Snapshot.(*PaiGowSnapshot)
		if len(s.DealerHigh) > 0 || len(s.Tiebreaker) > 0 {
			t.Fatal("dealer revealed before set")
		}
	}
	tab.leave("a")
	if !tab.hasParticipant("a") {
		t.Fatal("left committed round")
	}
	before := wallets["a"].chips
	tab.bet("a", "fortune", 5, wallets["a"])
	if wallets["a"].chips != before {
		t.Fatal("late bet charged")
	}
	tab.markDisconnected("a")
	tab.tick()
	tab.tick()
	if tab.phase != "waiting" || tab.hasParticipant("a") {
		t.Fatal("disconnect/timeout did not finish")
	}
	for _, w := range wallets {
		if len(w.open) > 0 {
			t.Fatal("unresolved stakes")
		}
	}
}

type pgFailWallet struct {
	testWallet
	fail  bool
	calls int
	ids   []string
}

func (w *pgFailWallet) PayCredits(n int, ids ...string) error {
	w.calls++
	if w.fail {
		return ErrWalletPersistence
	}
	w.ids = append([]string(nil), ids...)
	return w.testWallet.PayCredits(n, ids...)
}
func TestPaiGowAtomicRetryAndEnvy(t *testing.T) {
	tab := pgTestTable(true)
	a := &pgFailWallet{testWallet: testWallet{chips: 100}, fail: true}
	b := &pgFailWallet{testWallet: testWallet{chips: 100}}
	tab.join("a")
	tab.join("b")
	tab.bet("a", "fortune", 5, a)
	tab.bet("a", "main", 20, a)
	// b's main wager completes the table and deals immediately.
	tab.bet("b", "main", 20, b)
	// Script the dealt cards before either player sets. a loses Fortune but
	// collects b's fixed quad Envy, even though b didn't bet Fortune.
	tab.player("a").cards = pgCards("2s 4h 6c 8d Js Qh Ac")
	tab.player("b").cards = pgCards("Ks Kh Kc Kd 2h 3c 7h")
	// Autoset is off by default, so each player previews then confirms.
	tab.action("a", "house")
	tab.action("b", "house")
	tab.action("a", "set")
	tab.action("b", "set")
	if tab.phase != "settling" || len(a.open) != 2 || len(b.open) != 0 || b.calls != 1 {
		t.Fatal("failed settlement wasn't held atomically")
	}
	p := tab.player("a")
	if p.showdown == nil || !p.showdown.ShowEnvy || p.showdown.Envy != 5 {
		t.Fatalf("envy not reported: %+v", p.showdown)
	}
	cards := append([]card(nil), p.cards...)
	amount := p.payout
	tab.action("a", "house")
	if !reflect.DeepEqual(cards, p.cards) {
		t.Fatal("redrew pending result")
	}
	a.fail = false
	tab.action("a", "settle")
	if tab.phase != "waiting" || a.paid != amount || len(a.ids) != 2 || len(a.open) != 0 || b.calls != 1 {
		t.Fatal("retry did not settle exactly once")
	}
	tab.tick()
	if a.calls != 2 || b.calls != 1 {
		t.Fatal("double payout")
	}
}
func TestPaiGowRejectedFoulDoesNotLock(t *testing.T) {
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	// A lone main wager deals immediately, so the cards are already out.
	tab.bet("a", "", 10, w)
	p := tab.player("a")
	p.cards = pgCards("As Ah 2c 3d 4s 7h 9c")
	events := tab.action("a", "12")
	if p.ready || p.split.high != nil || p.pending.high != nil || !strings.Contains(events[0].Message, "FOUL HAND") {
		t.Fatal(events)
	}
	tab.action("a", "34567")
	if p.ready || p.pending.high != nil {
		t.Fatal("complement foul should fail")
	}
	tab.action("a", "67")
	if p.ready || p.pending.high == nil {
		t.Fatal("a legal arrangement should preview, not lock")
	}
	tab.action("a", "set")
	if tab.phase != "waiting" {
		t.Fatal("legal set did not settle")
	}
}
func TestPaiGowEnvyEligibilityAndMultipleAwards(t *testing.T) {
	for _, tt := range []struct {
		enabled     bool
		stake, envy int
	}{{true, 5, 25}, {true, 4, 0}, {false, 5, 0}} {
		tab := pgTestTable(tt.enabled)
		wallets := map[string]*testWallet{}
		for _, name := range []string{"a", "b", "c"} {
			tab.join(name)
			wallets[name] = &testWallet{chips: 100}
		}
		for _, name := range []string{"a", "b", "c"} {
			w := wallets[name]
			if name == "a" {
				tab.bet(name, "fortune", tt.stake, w)
			}
			tab.bet(name, "main", 20, w)
		}
		// The last main wager deals; script the hands before setting.
		// Own royal and dealer seven-card straight flush must NOT earn Envy.
		tab.player("a").cards = pgCards("10s Js Qs Ks As 2h 3d")
		tab.player("b").cards = pgCards("Ks Kh Kc Kd 2h 3c 7h")
		tab.player("c").cards = pgCards("2s 3s 4s 5s 6s 8h 9d")
		tab.dealer = pgCards("2h 3h 4h 5h 6h 7h 8h")
		tab.dealerSplit = pgHouse(tab.dealer)
		for _, name := range []string{"a", "b", "c"} {
			tab.action(name, "house")
			tab.action(name, "set")
		}
		p := tab.player("a")
		main := pgMainPay(20, pgMainResult(p.split, tab.dealerSplit, tab.dealer, PaiGowClassic, tab.tie), PaiGowClassic)
		wantEnvy := 0
		if tt.enabled && tt.stake >= 5 {
			wantEnvy = tt.envy
		}
		if want := main + tt.stake*151 + wantEnvy; p.payout != want {
			t.Fatalf("%+v payout=%d want=%d", tt, p.payout, want)
		}
	}
}
func TestPaiGowFaceUpAndPushAceHigh(t *testing.T) {
	// A pair of aces or an ace-headed flush is NOT an ace-high pai gow; only
	// a genuine best-five=ace-high triggers the automatic push.
	aceHigh := pgCards("As Ks Qh 9c 7d 4s 3h")
	pairAces := pgCards("As Ah Ks Qh 9c 7d 3s")
	flushAce := pgCards("Ah Kh Qh Jh 9h 3d 2c")
	for _, c := range []struct {
		cards []card
		push  bool
	}{{aceHigh, true}, {pairAces, false}, {flushAce, false}} {
		if got := pgDealerPush(c.cards, PaiGowFaceUp) != ""; got != c.push {
			t.Fatalf("%v push=%v", c.cards, got)
		}
	}
	if pgDealerPush(aceHigh, PaiGowEZ) != "" {
		t.Fatal("ace-high must not trigger the EZ queen-high push")
	}
	if pgDealerPush(pgCards("Qs Jh 9c 8d 6s 4h 2c"), PaiGowEZ) == "" {
		t.Fatal("EZ queen-high detection drifted")
	}
	rates, _ := (PaiGowConfig{PushAceHigh: "5_12_40"}).pushAceRates()
	if rates[0] != 5 || rates[1] != 12 {
		t.Fatal(rates)
	}
	// Side-bet classes: plain, with-Joker, both-ace-high, and no win.
	for _, tt := range []struct {
		dealer, player []card
		klass          string
		rate           int
	}{{
		pgCards("As Kh Qd 9c 7d 4s 3h"), pgCards("2h 3c 4d 5s 6h 7d 8c"), "plain", 5,
	}, {
		pgCards("JK Kh Qd 9c 7d 4s 2h"), pgCards("2h 3c 4d 5s 6h 7d 8c"), "joker", 15,
	}, {
		pgCards("Ah Kh Qd 9c 7d 4s 3h"), pgCards("Ad Kd Qh Jc 9s 5d 2c"), "both", 40,
	}, {
		pgCards("2h 3c 4d 5s 6h 7d 8c"), pgCards("As Kh Qd 9c 7d 4s 3h"), "none", 0,
	}} {
		got := pgPushAceClass(tt.dealer, tt.player, [3]int{5, 15, 40})
		if got.klass != tt.klass || got.rate != tt.rate {
			t.Fatalf("class %v want %v/%d", got, tt.klass, tt.rate)
		}
	}
	// Full engine pass on a Face Up table with the side bet.
	cfg := TableConfig{ID: "pg", Game: GamePaiGow, BettingTicks: 1, PaiGow: PaiGowConfig{Variant: PaiGowFaceUp, PushAceHigh: "5_15_40", Envy: true, ActionTicks: 1}}.Normalize()
	tab := newPaiGowTable(1, cfg, rand.New(rand.NewSource(5))).(*paiGowTable)
	w := &testWallet{chips: 500}
	tab.join("a")
	tab.bet("a", "pushace", 10, w)
	if len(w.open) != 1 {
		t.Fatal("pushace before main should be accepted")
	}
	tab.bet("a", "fortune", 5, w)
	// The cap is checked when the main wager lands.
	if events := tab.bet("a", "main", 10, w); len(events) == 0 || !strings.Contains(events[0].Message, "half the main wager") {
		t.Fatal("pushace cap not enforced", events, w.open)
	}
	tab.bet("a", "main", 20, w)
	pushaceStake := tab.player("a").pushace.Total
	// A lone main wager deals immediately; the dealer is revealed in setting.
	snap := tab.status("a")[0].Snapshot.(*PaiGowSnapshot)
	// The dealer acts first and the reveal happens in the setting phase.
	if len(snap.DealerHigh) != 5 || len(snap.DealerLow) != 2 {
		t.Fatal("Face Up dealer was not revealed during setting")
	}
	// The player must still set (or time out) unless the round auto-pushed.
	if tab.phase == "waiting" {
		t.Fatal("round resolved before player set")
	}
	tab.action("a", "house")
	tab.action("a", "set")
	if tab.phase != "waiting" || len(w.open) != 0 {
		t.Fatal("Face Up settlement did not finish", tab.phase, w.open)
	}
	// Reconstruct the outcome class from the announced result.
	p := tab.player("a")
	main := pgMainPay(20, pgMainResult(p.split, tab.dealerSplit, tab.dealer, PaiGowFaceUp, tab.tie), PaiGowFaceUp)
	expect := main
	if row, win := pgFortune(p.cards, true); win {
		expect += 5 * (row.Odds + 1) // the Fortune stake, before settlement resets it
	}
	if class := pgPushAceClass(tab.dealer, p.cards, [3]int{5, 15, 40}); class.klass != "none" {
		expect += pushaceStake * (class.rate + 1)
	}
	if p.payout != expect {
		t.Fatalf("payout %d want %d (dealer %v, result %s)", p.payout, expect, tab.dealer, p.result)
	}
}
func TestPaiGowConfigurationAndRefund(t *testing.T) {
	for _, c := range []TableConfig{{ID: "pg", Game: GamePaiGow, MaxPlayers: 7}, {ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{Variant: "fake"}}, {ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{ActionTicks: -1}}, {ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{Variant: PaiGowFaceUp}}, {ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{Variant: PaiGowFaceUp, PushAceHigh: "9_9_9"}}, {ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{Variant: PaiGowEZ, PushAceHigh: "5_15_40"}}, {ID: "bj", Game: GameBlackjack, PaiGow: PaiGowConfig{Envy: true}}} {
		if c.Validate() == nil {
			t.Fatal("accepted", c)
		}
	}
	c := TableConfig{ID: "pg", Game: GamePaiGow}
	if c.Validate() != nil || c.Normalize().MaxPlayers != 6 {
		t.Fatal("defaults")
	}
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	tab.bet("a", "fortune", 5, w)
	if len(w.open) != 1 {
		t.Fatal("side before main should be accepted")
	}
	tab.bet("a", "main", 10, w)
	tab.refundAll()
	if w.chips != 100 || len(w.open) > 0 {
		t.Fatal("refund failed")
	}
}

func TestPaiGowA2345Option(t *testing.T) {
	if !(PaiGowConfig{}).A2345High() {
		t.Fatal("A2345 must default to the second-highest straight")
	}
	wheel := pgCards("As 2h 3c 4d 5s")
	if got := pgEvaluate(wheel); got != (pgRank{4, 15}) {
		t.Fatalf("default wheel rank %v", got)
	}
	if got := pgEvaluateRules(wheel, false); got != (pgRank{4, 5}) {
		t.Fatalf("demoted wheel rank %v", got)
	}
	six := pgCards("2h 3c 4d 5s 6h")
	if pgCompare(pgEvaluateRules(wheel, false), pgEvaluateRules(six, false)) >= 0 {
		t.Fatal("a demoted wheel must be the lowest straight")
	}
	jokerWheel := pgCards("Ah 2c 3d 4s JK")
	if got := pgEvaluateRules(jokerWheel, false); got[0] != 4 || got[1] != 5 {
		t.Fatalf("demoted Joker wheel rank %v", got)
	}
}

func TestPaiGowRankNames(t *testing.T) {
	cases := []struct {
		cards string
		name  string
	}{
		{"As Ah", "PAIR OF ACES"},
		{"Ks Qh", "HIGH CARD KING"},
		{"As Ah Kc Kd 2s", "TWO PAIR ACES AND KINGS"},
		{"As Kh Qc Jd 10s", "STRAIGHT ACE-HIGH"},
		{"2s 3h 4c 5d 6s", "STRAIGHT SIX-HIGH"},
		{"As 2h 3c 4d 5s", "STRAIGHT FIVE-HIGH"},
		{"10s Js Qs Ks As", "ROYAL FLUSH"},
		{"Ks Kh Kd Kc 2s", "FOUR OF A KIND KINGS"},
		{"Ks Kh Kd Qc Qs", "FULL HOUSE KINGS FULL OF QUEENS"},
	}
	for _, tt := range cases {
		if got := pgRankName(pgEvaluate(pgCards(tt.cards))); got != tt.name {
			t.Errorf("%s = %q want %q", tt.cards, got, tt.name)
		}
	}
}

func TestPaiGowManualSetConfirmsBeforeReveal(t *testing.T) {
	tab := pgTestTable(false)
	wa, wb := &testWallet{chips: 100}, &testWallet{chips: 100}
	tab.join("a")
	tab.join("b")
	tab.bet("a", "main", 10, wa)
	tab.bet("b", "main", 10, wb)
	p := tab.player("a")
	p.cards = pgCards("As Ah 2c 3d 4s 7h 9c")
	events := tab.action("a", "house")
	if p.ready || p.pending.high == nil {
		t.Fatalf("house should preview, not lock: ready=%v pending=%+v", p.ready, p.pending)
	}
	snap := events[len(events)-1].Snapshot.(*PaiGowSnapshot)
	if !snap.Preview || len(snap.PreviewHigh) != 5 || len(snap.PreviewLow) != 2 {
		t.Fatalf("arranged preview missing: %+v", snap)
	}
	if len(snap.DealerHigh) != 0 {
		t.Fatal("dealer revealed before set")
	}
	// "set" locks the arrangement but the round stays open for b.
	events = tab.action("a", "set")
	if !p.ready || tab.phase != "setting" {
		t.Fatalf("set did not lock: ready=%v phase=%s", p.ready, tab.phase)
	}
	snap = events[len(events)-1].Snapshot.(*PaiGowSnapshot)
	if snap.Showdown != nil {
		t.Fatal("showdown before every seat set")
	}
	// b finishing the house way settles both.
	tab.action("b", "house")
	tab.action("b", "set")
	if tab.phase != "waiting" || p.showdown == nil || len(p.showdown.Hands) != 4 {
		t.Fatalf("round did not settle: phase=%s showdown=%+v", tab.phase, p.showdown)
	}
	// The showdown compares high hands first, then low hands.
	labels := []string{p.showdown.Hands[0].Label, p.showdown.Hands[1].Label, p.showdown.Hands[2].Label, p.showdown.Hands[3].Label}
	want := []string{"Your high", "Dealer high", "Your low", "Dealer low"}
	if !reflect.DeepEqual(labels, want) {
		t.Fatalf("showdown order %v want %v", labels, want)
	}
}

func TestPaiGowPreviewKeepsOriginalPositions(t *testing.T) {
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	tab.bet("a", "", 10, w)
	p := tab.player("a")
	p.cards = pgCards("As Ah 2c 3d 4s 7h 9c")
	events := tab.action("a", "24")
	snap := events[len(events)-1].Snapshot.(*PaiGowSnapshot)
	if !snap.Preview {
		t.Fatal("a legal arrangement should preview")
	}
	if !reflect.DeepEqual(snap.PreviewLowNums, []int{2, 4}) {
		t.Fatalf("low numbers %v", snap.PreviewLowNums)
	}
	if !reflect.DeepEqual(snap.PreviewHighNums, []int{1, 3, 5, 6, 7}) {
		t.Fatalf("high numbers %v", snap.PreviewHighNums)
	}
}

func TestPaiGowAutosetLocksWithoutPreview(t *testing.T) {
	cfg := TableConfig{ID: "pg", Game: GamePaiGow, BettingTicks: 2, PaiGow: PaiGowConfig{Autoset: true, ActionTicks: 60}}.Normalize()
	tab := newPaiGowTable(1, cfg, rand.New(rand.NewSource(3))).(*paiGowTable)
	wa, wb := &testWallet{chips: 100}, &testWallet{chips: 100}
	tab.join("a")
	tab.join("b")
	if !tab.player("a").autoset {
		t.Fatal("table config did not seed the seat's autoset")
	}
	tab.bet("a", "main", 10, wa)
	tab.bet("b", "main", 10, wb)
	p := tab.player("a")
	p.cards = pgCards("As Ah 2c 3d 4s 7h 9c")
	events := tab.action("a", "house")
	if !p.ready || p.pending.high != nil {
		t.Fatalf("autoset did not lock: ready=%v pending=%+v", p.ready, p.pending)
	}
	snap := events[len(events)-1].Snapshot.(*PaiGowSnapshot)
	if snap.Preview || len(snap.Cards) != 0 {
		t.Fatalf("autoset re-showed the hand: preview=%v cards=%d", snap.Preview, len(snap.Cards))
	}
	if !strings.Contains(snap.Result, "waiting") {
		t.Fatalf("waiting note missing: %q", snap.Result)
	}
}

func TestPaiGowAutosetToggle(t *testing.T) {
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	if events := tab.action("a", "autoset on"); !hasMessage(events, "Autoset is on.") {
		t.Fatalf("autoset on failed: %+v", events)
	}
	tab.bet("a", "", 10, w)
	p := tab.player("a")
	p.cards = pgCards("As Ah 2c 3d 4s 7h 9c")
	tab.action("a", "24")
	// A lone bettor settles at once, so a locked hand shows as a showdown.
	if p.showdown == nil && (!p.ready || p.pending.high != nil) {
		t.Fatalf("toggled autoset did not lock: ready=%v pending=%+v", p.ready, p.pending)
	}
}

func TestPaiGowSoloMainDealsAfterSideBets(t *testing.T) {
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	// Side bets come first; they are accepted before any main wager.
	tab.bet("a", "fortune", 5, w)
	if len(w.open) != 1 {
		t.Fatalf("fortune before main rejected: %v", w.open)
	}
	if tab.phase != "waiting" {
		t.Fatalf("a side bet alone opened the betting window: %s", tab.phase)
	}
	// The main wager deals a lone table immediately.
	tab.bet("a", "main", 10, w)
	if tab.phase != "setting" {
		t.Fatalf("solo main did not deal: %s", tab.phase)
	}
	if events := tab.bet("a", "fortune", 5, w); len(events) == 0 || !hasMessage(events, "Betting is closed") {
		t.Fatalf("bet accepted after the deal: %+v", events)
	}
}

func TestPaiGowWindowDealsWhenEveryBettorIsIn(t *testing.T) {
	tab := pgTestTable(false)
	wa, wb := &testWallet{chips: 100}, &testWallet{chips: 100}
	tab.join("a")
	tab.join("b")
	tab.bet("a", "main", 10, wa)
	if tab.phase != "betting" {
		t.Fatalf("window did not open for a second seat: %s", tab.phase)
	}
	tab.bet("b", "main", 10, wb)
	if tab.phase != "setting" {
		t.Fatalf("all-bet table did not deal: %s", tab.phase)
	}
}

func TestPaiGowUnbetAndStopRefundBeforeDeal(t *testing.T) {
	tab := pgTestTable(false)
	wa := &testWallet{chips: 100}
	tab.join("a")
	tab.join("b")
	tab.bet("a", "main", 10, wa)
	if events := tab.action("a", "unbet main"); !hasMessage(events, "take back") {
		t.Fatalf("unbet main failed: %+v", events)
	}
	if wa.chips+wa.paid != 100 || len(wa.open) != 0 || tab.phase != "waiting" || tab.player("a").main.Total != 0 {
		t.Fatalf("unbet main left state: chips=%d paid=%d phase=%s", wa.chips, wa.paid, tab.phase)
	}
	// A side bet placed and then abandoned is returned when the seat leaves.
	tab.bet("a", "fortune", 5, wa)
	if wa.chips+wa.paid != 95 {
		t.Fatalf("fortune not charged: chips=%d paid=%d", wa.chips, wa.paid)
	}
	if events := tab.leave("a"); !hasMessage(events, "You leave Pai Gow Poker.") {
		t.Fatalf("leave during betting: %+v", events)
	}
	if wa.chips+wa.paid != 100 || len(wa.open) != 0 || tab.hasParticipant("a") {
		t.Fatalf("stop did not refund/remove: chips=%d paid=%d seated=%v", wa.chips, wa.paid, tab.hasParticipant("a"))
	}
}

func TestPaiGowPushAceCapAtMainWager(t *testing.T) {
	cfg := TableConfig{ID: "pg", Game: GamePaiGow, PaiGow: PaiGowConfig{Variant: PaiGowFaceUp, PushAceHigh: "5_15_40"}}.Normalize()
	tab := newPaiGowTable(1, cfg, rand.New(rand.NewSource(9))).(*paiGowTable)
	w := &testWallet{chips: 100}
	tab.join("a")
	tab.bet("a", "pushace", 10, w)
	if events := tab.bet("a", "main", 10, w); len(events) == 0 || !hasMessage(events, "half the main wager") {
		t.Fatalf("pushace cap not checked when the main lands: %+v", events)
	}
	if w.chips != 90 || tab.player("a").main.Total != 0 {
		t.Fatalf("rejected main changed state: chips=%d main=%d", w.chips, tab.player("a").main.Total)
	}
}

func TestPaiGowRefundAllReturnsSideBetsWithoutMain(t *testing.T) {
	tab := pgTestTable(false)
	w := &testWallet{chips: 100}
	tab.join("a")
	tab.bet("a", "fortune", 5, w)
	tab.refundAll()
	if w.chips != 100 || len(w.open) != 0 {
		t.Fatalf("side-only refund failed: chips=%d open=%d", w.chips, len(w.open))
	}
}