package casino

import (
	"fmt"
	"math/rand"
	"strconv"
	"strings"
)

// RouletteConfig selects European (single zero) or American (double zero) rules.
// Racetrack adds the French call bets and neighbours bets; it is a single-zero
// layout only.
type RouletteConfig struct {
	DoubleZero bool `yaml:"double_zero,omitempty"`
	Racetrack  bool `yaml:"racetrack,omitempty"`
	SpinTicks  int  `yaml:"spin_ticks,omitempty"`
}

var europeanWheel = strings.Fields("0 32 15 19 4 21 2 25 17 34 6 27 13 36 11 30 8 23 10 5 24 16 33 1 20 14 31 9 22 18 29 7 28 12 35 3 26")
var americanWheel = strings.Fields("0 28 9 26 30 11 7 20 32 17 5 22 34 15 3 24 36 13 1 00 27 10 25 29 12 8 19 31 18 6 21 33 16 4 23 35 14 2")

func rouletteWheel(double bool) []string {
	if double {
		return americanWheel
	}
	return europeanWheel
}

// WheelOrder returns a copy of the pocket order (clockwise from the top) for
// presentation layers that draw the wheel themselves.
func WheelOrder(double bool) []string { return append([]string(nil), rouletteWheel(double)...) }
func rouletteRed(n int) bool {
	switch n {
	case 1, 3, 5, 7, 9, 12, 14, 16, 18, 19, 21, 23, 25, 27, 30, 32, 34, 36:
		return true
	}
	return false
}

// normalizeRouletteSpot maps legacy bet names onto the labels shown on the
// board. The old dozen/column spellings stay accepted so existing habits and
// older help text keep working.
func normalizeRouletteSpot(spot string) string {
	switch spot {
	case "dozen1":
		return "1to12"
	case "dozen2":
		return "13to24"
	case "dozen3":
		return "25to36"
	case "column1":
		return "row1"
	case "column2":
		return "row2"
	case "column3":
		return "row3"
	}
	return spot
}

// Returns the covered pockets and total-return multiplier (stake included).
// Zero never belongs to an outside bet. Combination bets (splits, streets,
// corners, six-lines, trios and the basket) are parsed from a compact number
// list: the leading keyword is optional because the covered set uniquely
// identifies the bet.
func rouletteBet(spot string, double bool) ([]string, int) {
	spot = normalizeRouletteSpot(spot)
	if pockets, mult := rouletteStraightBet(spot, double); mult > 0 {
		return pockets, mult
	}
	if pockets, mult := rouletteOutsideBet(spot); mult > 0 {
		return pockets, mult
	}
	return rouletteCombinationBet(spot, double)
}

// rouletteStraightBet covers a single pocket: any number, 0, or 00 (American
// tables only). It pays 35:1, a 36x total return.
func rouletteStraightBet(spot string, double bool) ([]string, int) {
	if spot == "00" {
		if double {
			return []string{spot}, 36
		}
		return nil, 0
	}
	if n, err := strconv.Atoi(spot); err == nil && n >= 0 && n <= 36 && strconv.Itoa(n) == spot {
		return []string{spot}, 36
	}
	return nil, 0
}

// rouletteOutsideBet covers the even-money, dozen, and row wagers, whose
// pocket counts all divide 36 exactly, so the return is 36/len.
func rouletteOutsideBet(spot string) ([]string, int) {
	var pockets []string
	for n := 1; n <= 36; n++ {
		hit := false
		switch spot {
		case "red":
			hit = rouletteRed(n)
		case "black":
			hit = !rouletteRed(n)
		case "odd":
			hit = n%2 == 1
		case "even":
			hit = n%2 == 0
		case "low":
			hit = n <= 18
		case "high":
			hit = n >= 19
		case "1to12":
			hit = n <= 12
		case "13to24":
			hit = n >= 13 && n <= 24
		case "25to36":
			hit = n >= 25
		case "row1":
			hit = n%3 == 0
		case "row2":
			hit = n%3 == 2
		case "row3":
			hit = n%3 == 1
		}
		if hit {
			pockets = append(pockets, strconv.Itoa(n))
		}
	}
	if len(pockets) == 0 {
		return nil, 0
	}
	return pockets, 36 / len(pockets)
}

// rouletteComboKeywords maps the accepted names for a combination bet onto
// its canonical kind. Several names share a kind ("square" is a corner,
// "sixline"/"double street" is a line).
var rouletteComboKeywords = map[string]string{
	"split":         "split",
	"street":        "street",
	"corner":        "corner",
	"square":        "corner",
	"line":          "line",
	"sixline":       "line",
	"six-line":      "line",
	"doublestreet":  "line",
	"double-street": "line",
	"trio":          "trio",
	"basket":        "basket",
}

// Payout returns are 36/covered for every combination except the five-number
// American basket, which pays a deliberately short 6:1 (7x total).
func rouletteCombinationBet(spot string, double bool) ([]string, int) {
	kind, nums, ok := parseRouletteCombination(spot, double)
	if !ok {
		return nil, 0
	}
	if kind == "" {
		kind = inferRouletteCombination(nums)
	}
	switch kind {
	case "split":
		if len(nums) == 2 && rouletteAdjacent(nums[0], nums[1], double) {
			return nums, 18
		}
	case "street":
		if rouletteIsStreet(nums) {
			return nums, 12
		}
	case "corner":
		if rouletteIsCorner(nums, double) {
			return nums, 9
		}
	case "line":
		if rouletteIsLine(nums) {
			return nums, 6
		}
	case "trio":
		if rouletteIsTrio(nums, double) {
			return nums, 12
		}
	case "basket":
		if pockets, mult, valid := rouletteBasket(nums, double); valid {
			return pockets, mult
		}
	}
	return nil, 0
}

// parseRouletteCombination strips an optional leading keyword and converts the
// remaining number tokens (separated by spaces, dashes, slashes, commas or
// backslashes) into canonical pocket names. Duplicate numbers are rejected.
func parseRouletteCombination(spot string, double bool) (string, []string, bool) {
	fields := strings.Fields(strings.ToLower(spot))
	if len(fields) == 0 {
		return "", nil, false
	}
	kind := ""
	switch fields[0] {
	case "split", "street", "corner", "square", "line", "sixline", "six-line", "doublestreet", "double-street", "trio", "basket":
		kind = fields[0]
		fields = fields[1:]
	case "six":
		if len(fields) > 1 && fields[1] == "line" {
			kind, fields = "sixline", fields[2:]
		}
	case "double":
		if len(fields) > 1 && fields[1] == "street" {
			kind, fields = "doublestreet", fields[2:]
		}
	}
	if canonical, ok := rouletteComboKeywords[kind]; ok {
		kind = canonical
	} else if kind != "" {
		return "", nil, false
	}
	if kind == "basket" && len(fields) == 0 {
		return "basket", nil, true
	}
	if len(fields) == 0 {
		return "", nil, false
	}
	raw := strings.NewReplacer("-", " ", "/", " ", ",", " ", "\\", " ").Replace(strings.Join(fields, " "))
	seen := map[string]bool{}
	var nums []string
	for _, tok := range strings.Fields(raw) {
		pocket, ok := roulettePocketToken(tok, double)
		if !ok || seen[pocket] {
			return "", nil, false
		}
		seen[pocket] = true
		nums = append(nums, pocket)
	}
	if len(nums) == 0 {
		return "", nil, false
	}
	return kind, nums, true
}

// roulettePocketToken canonicalizes one number token: a plain 0-36 value or
// 00, rejecting non-canonical spellings such as "01", "+1" or "000".
func roulettePocketToken(tok string, double bool) (string, bool) {
	if tok == "00" {
		return "00", double
	}
	n, err := strconv.Atoi(tok)
	if err != nil || n < 0 || n > 36 || strconv.Itoa(n) != tok {
		return "", false
	}
	return strconv.Itoa(n), true
}

// inferRouletteCombination identifies a bare number list by its size. Adjacency
// and geometry are validated after this, so an ambiguous count still fails.
func inferRouletteCombination(nums []string) string {
	switch len(nums) {
	case 2:
		return "split"
	case 3:
		if rouletteIsStreet(nums) {
			return "street"
		}
		return "trio"
	case 4:
		return "corner"
	case 5:
		return "basket"
	case 6:
		return "line"
	}
	return ""
}

// rouletteNumberCell maps 1-36 onto its column and row on the felt: column
// 0-11 left to right, row 0-2 bottom to top (row 0 holds 1,4,7,...).
func rouletteNumberCell(n string) (col, row int, ok bool) {
	v, err := strconv.Atoi(n)
	if err != nil || v < 1 || v > 36 {
		return 0, 0, false
	}
	return (v - 1) / 3, (v - 1) % 3, true
}

// rouletteAdjacent reports whether two pockets share an edge: horizontally
// (same row, neighboring columns) or vertically (same column, neighboring
// rows). Zero and double zero use the felt's special zero edge.
func rouletteAdjacent(a, b string, double bool) bool {
	if a == "0" || a == "00" || b == "0" || b == "00" {
		return rouletteZeroAdjacent(a, b, double)
	}
	ac, ar, ok := rouletteNumberCell(a)
	if !ok {
		return false
	}
	bc, br, ok := rouletteNumberCell(b)
	if !ok {
		return false
	}
	dc, dr := ac-bc, ar-br
	if dc < 0 {
		dc = -dc
	}
	if dr < 0 {
		dr = -dr
	}
	return (dc == 1 && dr == 0) || (dc == 0 && dr == 1)
}

// European zero touches 1, 2 and 3. On the American layout, 0
// touches 1 and 2; 00 touches 2 and 3. The zeros also touch each other.
func rouletteZeroAdjacent(a, b string, double bool) bool {
	if b == "0" || b == "00" {
		a, b = b, a
	}
	if !double {
		return a == "0" && (b == "1" || b == "2" || b == "3")
	}
	return (a == "0" && (b == "00" || b == "1" || b == "2")) ||
		(a == "00" && (b == "0" || b == "2" || b == "3"))
}

func rouletteIsStreet(nums []string) bool {
	if len(nums) != 3 {
		return false
	}
	set := map[int]bool{}
	for _, s := range nums {
		v, err := strconv.Atoi(s)
		if err != nil {
			return false
		}
		set[v] = true
	}
	if len(set) != 3 {
		return false
	}
	for n := 1; n <= 34; n += 3 {
		if set[n] && set[n+1] && set[n+2] {
			return true
		}
	}
	return false
}

func rouletteIsCorner(nums []string, double bool) bool {
	if len(nums) != 4 {
		return false
	}
	// The European "first four" (0,1,2,3) is the only zero corner.
	if !double && rouletteIsFirstFour(nums) {
		return true
	}
	minCol, maxCol, minRow, maxRow := 12, -1, 3, -1
	cells := map[[2]int]bool{}
	for _, s := range nums {
		c, r, ok := rouletteNumberCell(s)
		if !ok {
			return false
		}
		cells[[2]int{c, r}] = true
		minCol, maxCol = min(minCol, c), max(maxCol, c)
		minRow, maxRow = min(minRow, r), max(maxRow, r)
	}
	return len(cells) == 4 && maxCol-minCol == 1 && maxRow-minRow == 1
}

func rouletteIsFirstFour(nums []string) bool {
	if len(nums) != 4 {
		return false
	}
	set := map[string]bool{}
	for _, s := range nums {
		set[s] = true
	}
	return set["0"] && set["1"] && set["2"] && set["3"]
}

// A six-line is two neighboring columns, i.e. six numbers across all three
// rows of two adjacent streets.
func rouletteIsLine(nums []string) bool {
	if len(nums) != 6 {
		return false
	}
	cols := map[int]bool{}
	set := map[int]bool{}
	for _, s := range nums {
		c, _, ok := rouletteNumberCell(s)
		if !ok {
			return false
		}
		v, _ := strconv.Atoi(s)
		cols[c] = true
		set[v] = true
	}
	if len(cols) != 2 || len(set) != 6 {
		return false
	}
	var c1, c2 int
	first := true
	for c := range cols {
		if first {
			c1, first = c, false
		} else {
			c2 = c
		}
	}
	if c1 > c2 {
		c1, c2 = c2, c1
	}
	return c2-c1 == 1
}

// Trios cover touching zero-edge intersections, not arbitrary selections
// from the zeros and the first street.
func rouletteIsTrio(nums []string, double bool) bool {
	if len(nums) != 3 {
		return false
	}
	set := map[string]bool{}
	for _, n := range nums {
		set[n] = true
	}
	if double {
		return (set["0"] && set["1"] && set["2"]) ||
			(set["0"] && set["00"] && set["2"]) ||
			(set["00"] && set["2"] && set["3"])
	}
	return set["0"] && set["2"] && (set["1"] || set["3"])
}

// The basket is the American five-number 0/00/1/2/3 bet, which pays a short
// 6:1. On a single-zero felt the name covers the European first four instead.
// An empty list means the bare "basket" keyword.
func rouletteBasket(nums []string, double bool) ([]string, int, bool) {
	if len(nums) == 0 {
		if double {
			return []string{"0", "00", "1", "2", "3"}, 7, true
		}
		return []string{"0", "1", "2", "3"}, 9, true
	}
	if double {
		set := map[string]bool{}
		for _, s := range nums {
			set[s] = true
		}
		if len(nums) != 5 {
			return nil, 0, false
		}
		for _, need := range []string{"0", "00", "1", "2", "3"} {
			if !set[need] {
				return nil, 0, false
			}
		}
		return []string{"0", "00", "1", "2", "3"}, 7, true
	}
	if rouletteIsFirstFour(nums) {
		return []string{"0", "1", "2", "3"}, 9, true
	}
	return nil, 0, false
}

type roulettePlayer struct {
	Participant
	lastSpot string
	lastBet  int
}

func (p *roulettePlayer) participantPtr() *Participant { return &p.Participant }

// Keep a small, table-local window of completed spins (oldest first).
const rouletteHistoryLimit = 50

type rouletteTable struct {
	tableCore[*roulettePlayer]
	rng           *rand.Rand
	spinRemaining int
	lastResult    *RouletteSnapshot
	history       []string
}

func newRouletteTable(room int, cfg TableConfig, rng *rand.Rand) *rouletteTable {
	cfg = cfg.Normalize()
	return &rouletteTable{tableCore: newTableCore[*roulettePlayer](&tableBase{RoomID: room, Config: cfg}), rng: rng}
}
func (t *rouletteTable) view() *RouletteSnapshot {
	s := &RouletteSnapshot{DoubleZero: t.Config.Roulette.DoubleZero, Racetrack: t.Config.Roulette.Racetrack, Phase: string(t.phase), Wheel: rouletteWheel(t.Config.Roulette.DoubleZero), History: append([]string(nil), t.history...)}
	for _, p := range t.players.ordered() {
		s.Players = append(s.Players, p.Name)
	}
	return s
}
func (t *rouletteTable) menuEvent(name string) Event {
	commands := []MenuCommand{}
	p := t.players.get(name)
	if t.phase != phasePlaying && p != nil && !p.HasBet {
		commands = append(commands, MenuCommand{Command: "bet <amount> on <target>", Desc: "Place one wager; targets: list"})
		if p.lastBet > 0 {
			commands = append(commands, MenuCommand{Command: "bet / rebet", Desc: "Repeat your previous wager"})
		}
	}
	if p != nil {
		commands = append(commands, MenuCommand{Command: "sitout / stop", Desc: "Sit out / leave when your wager settles"})
	}
	commands = append(commands, MenuCommand{Command: "table", Desc: "View the layout"})
	if p != nil {
		commands = withTableHints(commands, t.wagerRows())
	}
	e := t.betMenuEvent(name, commands)
	e.Snapshot = t.view()
	return e
}
func (t *rouletteTable) join(name string) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	if t.players.has(name) {
		return []Event{t.menuEvent(name)}
	}
	if t.players.count() >= t.Config.MaxPlayers {
		return []Event{t.private(name, "That roulette table is full.")}
	}
	e := t.addSeatLocked(name, &roulettePlayer{Participant: Participant{Name: name, Connected: true}})
	return []Event{e, t.menuEvent(name)}
}
func (t *rouletteTable) leave(name string) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	p := t.players.get(name)
	if p == nil {
		return nil
	}
	if p.HasBet {
		return []Event{t.private(name, "Your roulette wager is committed until this spin ends.")}
	}
	t.removeSeatLocked(name)
	return t.closeIfEmptyLocked([]Event{t.playerAction(name, name+" stands up.", "You stand up.")})
}
func (t *rouletteTable) bet(name, spot string, amount int, w Wallet) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	p := t.players.get(name)
	if p == nil {
		return []Event{t.private(name, "You aren't playing roulette.")}
	}
	if t.phase == phasePlaying {
		return []Event{t.private(name, "No more bets! The wheel is spinning.")}
	}
	if p.HasBet {
		return []Event{t.private(name, "You have already bet this spin.")}
	}
	if spot == "" {
		spot = p.lastSpot
	}
	spot = normalizeRouletteSpot(spot)
	resolved, ok := rouletteWagerFor(spot, t.Config.Roulette.DoubleZero, t.Config.Roulette.Racetrack)
	if !ok {
		return []Event{t.private(name, "Unknown roulette target. Use table to see all available bets.")}
	}
	if amount < t.Config.MinBet || amount > t.Config.MaxBet {
		return []Event{t.private(name, "Roulette bets must be "+betRangeText(t.Config.MinBet, t.Config.MaxBet)+".")}
	}
	// Check every possible winning return before committing even an unlimited
	// wager: a call bet's components pay different multiples.
	if err := resolved.validate(amount); err != nil {
		return []Event{t.private(name, "That wager's potential payout is too large.")}
	}
	wager, err := w.Wager(amount)
	if err != nil {
		return []Event{t.private(name, walletErrorMessage(err))}
	}
	p.HasBet, p.Wager, p.Wallet, p.lastSpot, p.lastBet, p.SittingOut = true, wager, w, spot, amount, false
	events := []Event{t.playerAction(name, fmt.Sprintf("%s bets %d on %s.", name, amount, spot), fmt.Sprintf("You bet %d on %s.", amount, spot))}
	// Always offer a real betting phase, even with only one player. The
	// board is not attached here: it is sent once per round by the menu event
	// (join, settlement, or an explicit "table"), so placing a wager never
	// redraws it.
	if t.phase == phaseWaiting {
		t.phase = phaseBetting
		t.window.open(t.Config.BettingTicks)
		e := t.event(fmt.Sprintf("Roulette betting is open for %d ticks.", t.Config.BettingTicks), true)
		events = append(events, e)
	}
	return events
}
func (t *rouletteTable) tick() []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	if t.phase == phasePlaying {
		t.spinRemaining--
		if t.spinRemaining <= 0 {
			return t.settle()
		}
		return nil
	}
	if t.phase != phaseBetting {
		return nil
	}
	// Unlike card games, all seats betting does not close roulette early.
	t.window.timer.tick()
	if !t.window.timer.expired() {
		return nil
	}
	anyBet := false
	for _, p := range t.players.ordered() {
		anyBet = anyBet || p.HasBet
	}
	if !anyBet {
		t.resetRound()
		return nil
	}
	t.phase = phasePlaying
	t.spinRemaining = t.Config.Roulette.SpinTicks
	e := t.event("No more bets! The roulette wheel spins...", true)
	e.Snapshot = t.view()
	return []Event{e}
}
func (t *rouletteTable) settle() []Event {
	wheel := rouletteWheel(t.Config.Roulette.DoubleZero)
	index := t.rng.Intn(len(wheel))
	pocket := wheel[index]
	t.history = append(t.history, pocket)
	if len(t.history) > rouletteHistoryLimit {
		copy(t.history, t.history[len(t.history)-rouletteHistoryLimit:])
		t.history = t.history[:rouletteHistoryLimit]
	}
	s := t.view()
	s.Phase = "result"
	// Show the winning pocket with two physical neighbours on each side so
	// the result reads like a slice of the real wheel.
	n := len(wheel)
	s.Pockets = [5]string{
		wheel[(index-2+n)%n], wheel[(index-1+n)%n], pocket,
		wheel[(index+1)%n], wheel[(index+2)%n],
	}
	t.lastResult = s
	e := t.event("The ball lands in {casino_emphasis}"+pocket+"{/}!", true)
	e.Snapshot = s
	events := []Event{e}
	for _, p := range t.players.ordered() {
		if !p.HasBet {
			continue
		}
		wager, resolved := rouletteWagerFor(p.lastSpot, t.Config.Roulette.DoubleZero, t.Config.Roulette.Racetrack)
		payout := 0
		result := "loss"
		var err error
		if resolved {
			if share, ok := wager.covers(pocket); ok {
				result = "win"
				payout, err = share.payout(p.Wager.Total)
			}
		}
		// PayCredits supports a zero return and atomically consumes a losing
		// stake too, surfacing persistence errors instead of announcing success.
		failed := err != nil
		if !failed {
			failed = p.Wallet.PayCredits(payout, p.Wager.ID) != nil
		}
		text := resultTextLabel(p.lastSpot, result, p.Wager.Total, payout)
		public := p.Name + " " + result + "."
		if failed {
			text = payoutFailedMessage()
			public = p.Name + "'s settlement is pending recovery."
		}
		event := t.playerAction(p.Name, public, text)
		// Returning players get their balance in the next-spin menu. Only
		// departures/sit-outs need a balance attached to the settlement.
		event.ShowBalance = !failed && (p.LeaveAfter || p.SitOutAfter || !p.Connected)
		if !failed {
			if result == "win" {
				event.Color = "casino_result_win"
			} else {
				event.Color = "casino_result_loss"
			}
		}
		events = append(events, event)
	}
	t.resetRound()
	events = append(events, t.finishControlsLocked()...)
	for _, p := range t.players.ordered() {
		if p.Connected && !p.SittingOut {
			events = append(events, t.menuEvent(p.Name))
		}
	}
	return events
}
func (t *rouletteTable) resetRound() {
	t.phase = phaseWaiting
	t.window.close()
	t.spinRemaining = 0
	clearBets(t.players.participants())
}
func (t *rouletteTable) action(name, action string) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	if events, ok := t.controlLocked(name, action); ok {
		return events
	}
	return []Event{t.private(name, "Roulette has no player actions after betting.")}
}
func (t *rouletteTable) rebet(name string) (string, int) {
	t.mu.Lock()
	defer t.mu.Unlock()
	if p := t.players.get(name); p != nil && p.lastBet > 0 {
		return p.lastSpot, p.lastBet
	}
	return "", t.Config.MinBet
}
func (t *rouletteTable) status(name string) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	message := t.overviewLocked()
	if text := t.seatStatusLocked(name); text != "" {
		message += "\n" + text
	}
	e := t.menuEvent(name)
	e.Message = message
	e.Menu.Heading = message
	e.Menu.ShowBalance = false
	events := []Event{e}
	if t.phase == phaseWaiting && t.lastResult != nil {
		last := t.private(name, "Last spin:")
		last.Snapshot = t.lastResult
		events = append(events, last)
	}
	return events
}
func (t *rouletteTable) markDisconnected(name string) []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	p := t.players.get(name)
	if p == nil {
		return nil
	}
	// No outcome has been sampled or revealed during the spin. Disconnect
	// refunds are safe, just as pre-deal baccarat refunds are.
	var events []Event
	if p.Wallet != nil {
		if _, _, err := p.Wallet.RefundOutstanding(); err != nil {
			events = append(events, t.private(name, "Your stake remains pending for startup recovery."))
		}
	}
	t.removeSeatLocked(name)
	if t.players.count() == 0 {
		t.resetRound()
	}
	return t.closeIfEmptyLocked(append(events, t.event(name+" stands up.", true)))
}
func (t *rouletteTable) refundAll() []Event {
	t.mu.Lock()
	defer t.mu.Unlock()
	events := t.refundAllLocked()
	t.resetRound()
	return events
}

// RouletteSnapshot describes the view without coupling the engine to terminal
// colors, Unicode preferences, or card-art settings.
type RouletteSnapshot struct {
	DoubleZero bool
	// Racetrack reports that the table also offers the French call bets and
	// neighbours bets, so the renderer draws the racetrack panel.
	Racetrack bool
	Phase     string
	Pockets   [5]string // winning pocket and two physical wheel neighbours each side
	Players   []string
	// Wheel is the pocket order clockwise from the top; the renderer colors
	// and places each pocket. It carries the zero count (one or two) so the
	// drawn wheel always matches the configured table.
	Wheel []string
	// History is a detached copy of the last 50 completed spins, oldest first.
	// It is table-local, survives round resets, and is not persisted on restart.
	History []string
}

func (*RouletteSnapshot) snapshot() {}