path: root/internal/casino/baccarat_test.go

package casino

import (
	"testing"
)

// tableauShoe builds a shoe that deals the given cards in order; draw pops
// from the end of the slice, so the deal order is stored reversed.
func tableauShoe(dealOrder ...card) *shoe {
	cards := make([]card, len(dealOrder))
	for i, c := range dealOrder {
		cards[len(dealOrder)-1-i] = c
	}
	return &shoe{cards: cards}
}

func forceShoe(t *baccaratTable, dealOrder ...card) {
	t.shoe = tableauShoe(dealOrder...)
}

func TestBaccaratTotal(t *testing.T) {
	if got := baccaratTotal([]card{{rank: "K"}, {rank: "Q"}}); got != 0 {
		t.Fatalf("faces total=%d, want 0", got)
	}
	if got := baccaratTotal([]card{{rank: "A"}, {rank: "10"}}); got != 1 {
		t.Fatalf("ace+ten total=%d, want 1", got)
	}
	if got := baccaratTotal([]card{{rank: "9"}, {rank: "8"}, {rank: "7"}}); got != 4 {
		t.Fatalf("9+8+7 total=%d, want 4 (mod 10)", got)
	}
}

func TestBaccaratTableauNaturalStands(t *testing.T) {
	player, banker := playTableau(tableauShoe(
		card{rank: "5"}, card{rank: "3"}, // player 8 (natural)
		card{rank: "2"}, card{rank: "3"}, // banker 5
		card{rank: "9"}, card{rank: "9"}, // would-be thirds must stay in the shoe
	))
	if len(player) != 2 || len(banker) != 2 {
		t.Fatalf("natural drew cards: player=%d banker=%d", len(player), len(banker))
	}
}

func TestBaccaratTableauPlayerStandsBankerDrawsToFive(t *testing.T) {
	player, banker := playTableau(tableauShoe(
		card{rank: "4"}, card{rank: "3"}, // player 7, stands
		card{rank: "2"}, card{rank: "3"}, // banker 5, draws
		card{rank: "9"}, // banker third card
	))
	if len(player) != 2 || len(banker) != 3 {
		t.Fatalf("player stand: player=%d banker=%d, want 2/3", len(player), len(banker))
	}
}

func TestBaccaratTableauPlayerStandsBankerStandsOnSix(t *testing.T) {
	player, banker := playTableau(tableauShoe(
		card{rank: "4"}, card{rank: "3"}, // player 7, stands
		card{rank: "4"}, card{rank: "2"}, // banker 6, stands
		card{rank: "9"},
	))
	if len(player) != 2 || len(banker) != 2 {
		t.Fatalf("banker 6 vs standing player: player=%d banker=%d, want 2/2", len(player), len(banker))
	}
}

func TestBaccaratTableauBankerThirdCardRules(t *testing.T) {
	tests := []struct {
		name        string
		bankerCards [2]card
		playerThird card
		wantDraw    bool
	}{
		{"banker 2 always draws", [2]card{{rank: "A"}, {rank: "A"}}, card{rank: "8"}, true},
		{"banker 3 draws vs 5", [2]card{{rank: "2"}, {rank: "A"}}, card{rank: "5"}, true},
		{"banker 3 stands vs 8", [2]card{{rank: "2"}, {rank: "A"}}, card{rank: "8"}, false},
		{"banker 4 draws vs 2", [2]card{{rank: "3"}, {rank: "A"}}, card{rank: "2"}, true},
		{"banker 4 stands vs A", [2]card{{rank: "3"}, {rank: "A"}}, card{rank: "A"}, false},
		{"banker 5 draws vs 4", [2]card{{rank: "4"}, {rank: "A"}}, card{rank: "4"}, true},
		{"banker 5 stands vs 3", [2]card{{rank: "4"}, {rank: "A"}}, card{rank: "3"}, false},
		{"banker 6 draws vs 6", [2]card{{rank: "5"}, {rank: "A"}}, card{rank: "6"}, true},
		{"banker 6 stands vs 5", [2]card{{rank: "5"}, {rank: "A"}}, card{rank: "5"}, false},
		{"banker 7 always stands", [2]card{{rank: "6"}, {rank: "A"}}, card{rank: "6"}, false},
	}
	for _, tt := range tests {
		player, banker := playTableau(tableauShoe(
			card{rank: "2"}, card{rank: "3"}, // player 5, draws
			tt.bankerCards[0], tt.bankerCards[1],
			tt.playerThird,  // player third card
			card{rank: "9"}, // banker third card (if drawn)
		))
		if got := len(banker) == 3; got != tt.wantDraw {
			t.Errorf("%s: banker drew=%v, want %v (player=%d cards)", tt.name, got, tt.wantDraw, len(player))
		}
		if len(player) != 3 {
			t.Errorf("%s: player=%d cards, want 3", tt.name, len(player))
		}
	}
}

func TestBaccaratSettlement(t *testing.T) {
	rules := (BaccaratConfig{}).Normalize()
	if result, payout := settleBaccaratBet(baccaratSpotPlayer, 100, 6, 4, rules); result != "win" || payout != 200 {
		t.Fatalf("player win: result=%s payout=%d, want win/200", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotBanker, 100, 6, 4, rules); result != "loss" || payout != 0 {
		t.Fatalf("banker bet on player win: result=%s payout=%d, want loss/0", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotBanker, 100, 4, 6, rules); result != "win" || payout != 195 {
		t.Fatalf("banker win: result=%s payout=%d, want win/195 (5%% commission)", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotTie, 100, 7, 7, rules); result != "win" || payout != 900 {
		t.Fatalf("tie win: result=%s payout=%d, want win/900 (8:1)", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotPlayer, 100, 7, 7, rules); result != "push" || payout != 100 {
		t.Fatalf("player bet on tie: result=%s payout=%d, want push/100", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotBanker, 100, 7, 7, rules); result != "push" || payout != 100 {
		t.Fatalf("banker bet on tie: result=%s payout=%d, want push/100", result, payout)
	}
	if result, payout := settleBaccaratBet(baccaratSpotTie, 100, 6, 4, rules); result != "loss" || payout != 0 {
		t.Fatalf("tie bet on player win: result=%s payout=%d, want loss/0", result, payout)
	}
}

func newBaccaratTestTable(cfg TableConfig) *baccaratTable {
	return newBaccaratTable(1, cfg, newTestRand())
}

func TestBaccaratSoloBetDealsImmediately(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat})
	table.join("alice")
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9 (natural)
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	w := &testWallet{credits: 100}
	events := table.bet("alice", baccaratSpotPlayer, 100, w)
	if !hasMessage(events, "New baccarat hand!") || !hasMessage(events, "Player wins 9 over 5.") {
		t.Fatalf("solo bet did not deal: %+v", events)
	}
	if w.paid != 200 {
		t.Fatalf("payout=%d, want 200 (stake + 1:1)", w.paid)
	}
	if table.phase != baccaratWaiting || table.participants["alice"].HasBet {
		t.Fatalf("table did not reset after deal: phase=%s", table.phase)
	}
	// The round event carries a snapshot of both hands and the bets.
	var snapshot *BaccaratSnapshot
	for _, event := range events {
		if event.Baccarat != nil {
			snapshot = event.Baccarat
		}
	}
	if snapshot == nil || len(snapshot.Player) != 2 || len(snapshot.Banker) != 2 ||
		snapshot.PlayerScore != "9" || snapshot.BankerScore != "5" ||
		len(snapshot.Bets) != 1 || snapshot.Bets[0].Spot != baccaratSpotPlayer || snapshot.Bets[0].Amount != 100 {
		t.Fatalf("unexpected snapshot: %+v", snapshot)
	}
}

func TestBaccaratWaitsForAllPlayersToBet(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2})
	table.join("alice")
	table.join("bob")
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	wa, wb := &testWallet{credits: 100}, &testWallet{credits: 100}
	if events := table.bet("alice", baccaratSpotBanker, 10, wa); hasMessage(events, "New baccarat hand!") {
		t.Fatal("deal started before all players bet")
	}
	events := table.bet("bob", baccaratSpotPlayer, 10, wb)
	if !hasMessage(events, "New baccarat hand!") {
		t.Fatalf("deal did not start after all players bet: %+v", events)
	}
	if wa.paid != 0 || wb.paid != 20 {
		t.Fatalf("payouts alice=%d bob=%d, want 0/20", wa.paid, wb.paid)
	}
}

func TestBaccaratBettingWindowTimesOut(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2, BettingTicks: 1})
	table.join("alice")
	table.join("bob")
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	w := &testWallet{credits: 100}
	table.bet("alice", baccaratSpotPlayer, 10, w)
	events := table.tick()
	if !hasMessage(events, "bob sits out this baccarat round.") {
		t.Fatalf("missing sit-out message: %+v", events)
	}
	if !hasMessage(events, "New baccarat hand!") {
		t.Fatalf("betting timeout did not deal for the bettor: %+v", events)
	}
	if w.paid != 20 {
		t.Fatalf("payout=%d, want 20", w.paid)
	}
}

func TestBaccaratBettingIgnoresDisconnected(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2})
	table.join("alice")
	table.join("bob")
	table.markDisconnected("bob")
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	w := &testWallet{credits: 100}
	events := table.bet("alice", baccaratSpotPlayer, 10, w)
	if !hasMessage(events, "New baccarat hand!") {
		t.Fatalf("disconnected player stalled the round: %+v", events)
	}
}

func TestBaccaratTiePushesAndPaysJackpotColor(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2})
	table.join("alice")
	table.join("bob")
	forceShoe(table,
		card{rank: "5"}, card{rank: "2"}, // player 7
		card{rank: "4"}, card{rank: "3"}, // banker 7
	)
	wa, wb := &testWallet{credits: 1000}, &testWallet{credits: 1000}
	table.bet("alice", baccaratSpotPlayer, 100, wa)
	events := table.bet("bob", baccaratSpotTie, 100, wb)
	if !hasMessage(events, "Player and banker tie at 7.") {
		t.Fatalf("missing tie outcome: %+v", events)
	}
	if wa.paid != 100 || wb.paid != 900 {
		t.Fatalf("payouts alice=%d bob=%d, want 100 (push)/900 (8:1)", wa.paid, wb.paid)
	}
	for _, event := range events {
		if event.PrivateTo == "bob" && event.PrivateMessage == "You win! +900 credits" && event.Color != "casino_jackpot_win" {
			t.Fatalf("tie win color=%q, want casino_jackpot_win", event.Color)
		}
	}
}

func TestBaccaratBetValidation(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MinBet: 5, MaxBet: 100})
	table.join("alice")
	w := &testWallet{credits: 1000}
	if events := table.bet("alice", "", 10, w); !hasMessage(events, "Bet on what?") {
		t.Fatalf("spotless first bet not guided: %+v", events)
	}
	if events := table.bet("alice", "red", 10, w); !hasMessage(events, "must be on player, banker, or tie") {
		t.Fatalf("invalid spot accepted: %+v", events)
	}
	if events := table.bet("alice", baccaratSpotPlayer, 200, w); !hasMessage(events, "between 5 and 100") {
		t.Fatalf("out-of-range bet accepted: %+v", events)
	}
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	table.bet("alice", baccaratSpotPlayer, 10, w)
	// After the round, the last spot is remembered: an empty spot reuses it.
	if spot, amount := table.rebet("alice"); spot != baccaratSpotPlayer || amount != 10 {
		t.Fatalf("rebet=(%q, %d), want (player, 10)", spot, amount)
	}
	forceShoe(table,
		card{rank: "5"}, card{rank: "4"}, // player 9
		card{rank: "2"}, card{rank: "3"}, // banker 5
	)
	if events := table.bet("alice", "", 20, w); !hasMessage(events, "You bet 20 credits on player.") {
		t.Fatalf("empty spot did not reuse last spot: %+v", events)
	}
	if w.paid != 20+40 {
		t.Fatalf("payout=%d, want 60 across both wins", w.paid)
	}
}

func TestBaccaratDoubleBetRejected(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2})
	table.join("alice")
	table.join("bob")
	w := &testWallet{credits: 1000}
	table.bet("alice", baccaratSpotPlayer, 10, w)
	if events := table.bet("alice", baccaratSpotBanker, 10, w); !hasMessage(events, "already bet") {
		t.Fatalf("second bet in a round accepted: %+v", events)
	}
}

func TestBaccaratLeaveAndTableFull(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 1})
	table.join("alice")
	if events := table.join("bob"); !hasMessage(events, "full") {
		t.Fatalf("full table admitted a second player: %+v", events)
	}
	w := &testWallet{credits: 100}
	table.bet("alice", baccaratSpotPlayer, 10, w) // solo: deals immediately
	if events := table.leave("alice"); !hasMessage(events, "You stand up.") || !hasMessage(events, "closes") {
		t.Fatalf("leave events missing: %+v", events)
	}

	busy := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, MaxPlayers: 2})
	busy.join("alice")
	busy.join("bob")
	busy.bet("alice", baccaratSpotPlayer, 10, w) // opens the betting window
	if events := busy.leave("alice"); !hasMessage(events, "middle of a baccarat round") {
		t.Fatalf("leave during betting not blocked: %+v", events)
	}
}

func TestBaccaratMenuAndActions(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat})
	events := table.join("alice")
	var menu *MenuView
	for _, event := range events {
		if event.Menu != nil {
			menu = event.Menu
		}
	}
	if menu == nil || menu.Kind != MenuBaccaratBet {
		t.Fatalf("join menu=%+v, want MenuBaccaratBet", menu)
	}
	if len(menu.Commands) != 3 || menu.Commands[0].Command != "bet <amount>" || menu.Commands[2].Command != "stop" {
		t.Fatalf("baccarat menu commands=%+v", menu.Commands)
	}
	if events := table.action("alice", "hit"); !hasMessage(events, "no player actions") {
		t.Fatalf("baccarat action not rejected: %+v", events)
	}
}

func TestBaccaratConfigDefaults(t *testing.T) {
	rules := (BaccaratConfig{}).Normalize()
	if rules.Decks != 8 || rules.ShuffleAt != 0.25 || rules.TiePayout != 8 || rules.BankerPayout != 0.95 {
		t.Fatalf("unexpected defaults: %+v", rules)
	}
}

func TestBaccaratShoeUsesConfiguredDecks(t *testing.T) {
	table := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat, Baccarat: BaccaratConfig{Decks: 2}})
	if table.shoe.decks != 2 || len(table.shoe.cards) != 104 {
		t.Fatalf("shoe decks=%d cards=%d, want 2 decks/104 cards", table.shoe.decks, len(table.shoe.cards))
	}
	def := newBaccaratTestTable(TableConfig{ID: "baccarat", Game: GameBaccarat})
	if def.shoe.decks != 8 || len(def.shoe.cards) != 416 {
		t.Fatalf("default shoe decks=%d cards=%d, want 8 decks/416 cards", def.shoe.decks, len(def.shoe.cards))
	}
}

func TestBaccaratTableRoutesThroughTable(t *testing.T) {
	table := newTable(1, TableConfig{ID: "baccarat", Game: GameBaccarat}, newTestRand())
	if _, isBaccarat := table.game.(*baccaratTable); !isBaccarat {
		t.Fatalf("newTable dispatched %T, want *baccaratTable", table.game)
	}
	table.join("alice")
	w := &testWallet{credits: 100}
	if events := table.bet("alice", baccaratSpotPlayer, 10, w); !hasMessage(events, "New baccarat hand!") {
		t.Fatalf("routed bet did not deal: %+v", events)
	}
}