package casino

import "fmt"

// betRangeText describes the accepted wager range; the unlimited sentinel is
// rendered as "no maximum" instead of a machine-sized integer.
func betRangeText(minBet, maxBet int) string {
	if maxBet == maxBetUnlimited {
		return fmt.Sprintf("%d or more (no maximum)", minBet)
	}
	return fmt.Sprintf("between %d and %d", minBet, maxBet)
}

type GameName string

const (
	GamePaiGow     GameName = "paigow"
	GameVideoPoker GameName = "video_poker"
	GameSlots      GameName = "slots"
	GamePlinko     GameName = "plinko"
	GamePachinko   GameName = "pachinko"
	GameCashHunt   GameName = "cash_hunt"
	GameCoinFlip   GameName = "coin_flip"
	GameBlackjack  GameName = "blackjack"
	GameBaccarat   GameName = "baccarat"
	GameRoulette   GameName = "roulette"
	GameBigSix     GameName = "big6"
	GameCrazyTime  GameName = "crazy_time"
	GameCraps      GameName = "craps"
)

type BlackjackConfig struct {
	Decks                int     `yaml:"decks,omitempty"`
	ShuffleAt            float64 `yaml:"shuffle_at,omitempty"`
	BlackjackPayout      float64 `yaml:"blackjack_payout,omitempty"`
	DealerHitSoft17      *bool   `yaml:"dealer_hit_soft_17,omitempty"`
	MaxSplitHands        int     `yaml:"max_split_hands,omitempty"`
	ResplitAces          *bool   `yaml:"resplit_aces,omitempty"`
	DoubleAfterSplit     *bool   `yaml:"double_after_split,omitempty"`
	DoubleSplitBlackjack *bool   `yaml:"double_split_blackjack,omitempty"`
	InsurancePayout      float64 `yaml:"insurance_payout,omitempty"`
	Surrender            *bool   `yaml:"surrender,omitempty"`
	ActionTicks          int     `yaml:"action_ticks,omitempty"`
	SplitUnlikeTenValues *bool   `yaml:"split_unlike_ten_values,omitempty"`
}

func ruleBool(value *bool, defaultValue bool) bool {
	if value == nil {
		return defaultValue
	}
	return *value
}

func (c BlackjackConfig) DealerHitsSoft17() bool       { return ruleBool(c.DealerHitSoft17, false) }
func (c BlackjackConfig) AllowsResplitAces() bool      { return ruleBool(c.ResplitAces, false) }
func (c BlackjackConfig) AllowsDoubleAfterSplit() bool { return ruleBool(c.DoubleAfterSplit, true) }

// CountsDoubleSplitBlackjack reports whether a 3+ card hand that reaches 21
// after a split and double is paid as a blackjack (3:2). When true (the
// default) this raises the table RTP above the nominal blackjack payout;
// standard play pays 1:1 for any 21 on a split hand, doubled or not.
func (c BlackjackConfig) CountsDoubleSplitBlackjack() bool {
	return ruleBool(c.DoubleSplitBlackjack, true)
}

func (c BlackjackConfig) AllowsSurrender() bool { return ruleBool(c.Surrender, false) }

// AllowsUnlikeTenSplit reports whether any two 10-valued cards may split
// (K+Q, 10+J). Casinos vary on whether identical ranks are required; true
// (the default) is the more permissive setting.
func (c BlackjackConfig) AllowsUnlikeTenSplit() bool { return ruleBool(c.SplitUnlikeTenValues, true) }

func (c BlackjackConfig) Normalize() BlackjackConfig {
	if c.Decks <= 0 {
		c.Decks = 8
	}
	if c.ShuffleAt <= 0 || c.ShuffleAt >= 1 {
		c.ShuffleAt = 0.25
	}
	if c.BlackjackPayout <= 0 {
		c.BlackjackPayout = 1.5
	}
	if c.MaxSplitHands <= 0 {
		c.MaxSplitHands = 4
	}
	if c.InsurancePayout <= 0 {
		c.InsurancePayout = 2
	}
	if c.ActionTicks <= 0 {
		c.ActionTicks = 20
	}
	return c
}

// BaccaratConfig holds punto banco rules, including no-commission exceptions
// and optional wagers. Commission tables pay BankerPayout:1 (0.95 = 5% fee);
// no-commission variants pay even money except for their specified exception.
type BaccaratConfig struct {
	Variant      string  `yaml:"variant,omitempty"` // commission, super_6, ez_baccarat
	PairBets     bool    `yaml:"pair_bets,omitempty"`
	Dragon7      bool    `yaml:"dragon_7,omitempty"`
	Panda8       bool    `yaml:"panda_8,omitempty"`
	Super6Bet    bool    `yaml:"super_6_bet,omitempty"`
	Decks        int     `yaml:"decks,omitempty"`
	ShuffleAt    float64 `yaml:"shuffle_at,omitempty"`
	TiePayout    float64 `yaml:"tie_payout,omitempty"`
	BankerPayout float64 `yaml:"banker_payout,omitempty"`
}

func (c BaccaratConfig) Normalize() BaccaratConfig {
	if c.Variant == "" {
		c.Variant = BaccaratCommission
	}
	if c.Decks <= 0 {
		c.Decks = 8
	}
	if c.ShuffleAt <= 0 || c.ShuffleAt >= 1 {
		c.ShuffleAt = 0.25
	}
	if c.TiePayout <= 0 {
		c.TiePayout = 8
	}
	if c.Variant == BaccaratSuper6 || c.Variant == BaccaratEZ {
		c.BankerPayout = 1
	} else if c.BankerPayout <= 0 {
		c.BankerPayout = 0.95
	}
	return c
}

type TableConfig struct {
	Plinko       PlinkoConfig     `yaml:"plinko,omitempty"`
	ID           string           `yaml:"id"`
	Game         GameName         `yaml:"game"`
	MaxPlayers   int              `yaml:"max_players,omitempty"`
	BettingTicks int              `yaml:"betting_ticks,omitempty"`
	MinBet       int              `yaml:"min_bet,omitempty"`
	MaxBet       int              `yaml:"max_bet,omitempty"`
	Blackjack    BlackjackConfig  `yaml:"blackjack,omitempty"`
	Baccarat     BaccaratConfig   `yaml:"baccarat,omitempty"`
	Roulette     RouletteConfig   `yaml:"roulette,omitempty"`
	Craps        CrapsConfig      `yaml:"craps,omitempty"`
	VideoPoker   VideoPokerConfig `yaml:"video_poker,omitempty"`
	PaiGow       PaiGowConfig     `yaml:"pai_gow,omitempty"`
}

type MachineConfig struct {
	ID        string   `yaml:"id"`
	Game      GameName `yaml:"game"`
	Variant   string   `yaml:"variant,omitempty"`
	MinBet    int      `yaml:"min_bet,omitempty"`
	MaxBet    int      `yaml:"max_bet,omitempty"`
	SpinTicks int      `yaml:"spin_ticks,omitempty"`
	Payout    float64  `yaml:"payout,omitempty"`
}

func (c MachineConfig) Normalize() MachineConfig {
	if c.MinBet <= 0 {
		c.MinBet = 1
	}
	// An unset MaxBet defaults to the economy's bounded cap; the explicit
	// unlimited sentinel is still honored for authored configurations.
	if c.MaxBet <= 0 {
		c.MaxBet = DefaultMaxBet
	}
	// Never leave a normalized config self-contradictory: a min_bet above
	// the default cap must widen the effective maximum rather than produce
	// a game every wager is rejected from.
	if c.MaxBet < c.MinBet {
		c.MaxBet = c.MinBet
	}
	if c.SpinTicks <= 0 {
		c.SpinTicks = 2
	}
	if c.Variant == "" {
		c.Variant = "huff_and_even_more_puff"
	}
	if c.Payout <= 0 {
		c.Payout = 0.97
	}
	return c
}

func (c TableConfig) Normalize() TableConfig {
	if c.MaxPlayers <= 0 {
		c.MaxPlayers = 8
	}
	if c.BettingTicks <= 0 {
		c.BettingTicks = 20
	}
	if c.MinBet <= 0 {
		c.MinBet = 1
	}
	if c.MaxBet <= 0 {
		c.MaxBet = DefaultMaxBet
	}
	// Normalize the game's own rule block through its registration, so a new
	// game gets its defaults without a third switch to remember.
	if def, ok := tableGameDefFor(c.Game); ok {
		c = def.normalize(c)
	}
	if c.MaxBet < c.MinBet {
		c.MaxBet = c.MinBet
	}
	return c
}

type Wager struct {
	Total   int
	Chips   int
	Credits int
	// ID is the wallet's opaque handle for the committed stake. It names the
	// stake when a settlement resolves it (PayCredits) or consumes it
	// (ResolveStake).
	ID string
}

type Wallet interface {
	// Wager debits the stake and records it as pending. ErrInsufficientFunds
	// is a normal rejected bet; ErrWalletPersistence means the debit could
	// not be made durable and the game must not proceed as if it succeeded.
	Wager(amount int) (Wager, error)
	// PayCredits banks a payout durably and, in the same save, resolves the
	// listed stakes (stakeIDs may be empty, for a payout that returns no
	// stake). A table passes the hand's stake IDs so the payout and the
	// stake return are one durable step; a slot win passes its triggering
	// stake. A failed save leaves the stakes pending — refunded at the next
	// startup, never paid on top of the refund — and the game must not
	// announce the win.
	PayCredits(amount int, stakeIDs ...string) error
	// ResolveStake consumes ONE pending stake by wallet handle (a single
	// hand paid or lost while a sibling hand's round is still in flight).
	ResolveStake(stakeID string)
	// ResolveStakesByIDs consumes the listed pending stakes in ONE save. It is
	// the batched form of ResolveStake used when a losing round has several
	// stakes (split/double hands) so they are not committed one save at a time.
	ResolveStakesByIDs(stakeIDs ...string)
	// RefundOutstanding returns every pending stake to the player (chips as
	// chips, credits as credits) and clears the ledger. An error means the
	// refund could not be made durable: nothing was returned and the stakes
	// remain pending for a later attempt or startup recovery.
	RefundOutstanding() (chips, credits int, err error)
	// RefundStakes returns the named pending stakes in kind — chips as chips,
	// credits as credits — and removes them from the ledger in one save. It is
	// the take-back path for a seat that holds specific handles; unlike
	// PayCredits it never converts casino-only chips into spendable credits.
	RefundStakes(stakeIDs ...string) error
}

type EventType string

// Only the event types the games actually construct are defined. Payout and
// win styling travels on Event.Color, so there is no separate payout event
// type to keep in sync.
const (
	EventJoined EventType = "joined"
	EventResult EventType = "result"
	EventLeft   EventType = "left"
)

// MenuView carries a structured menu alongside its plain-text Message so the
// presentation layer can enrich it (balances, command colors) without parsing
// message prefixes. It is deliberately game-agnostic: every game supplies a
// heading and its command list, and the renderer has no per-game switch that
// could silently drop a new game's commands.
type MenuView struct {
	Heading     string // prompt heading shown above the command list
	ShowBalance bool   // prepend the player's chips/credits balance
	Commands    []MenuCommand
	Repeat      bool // returning bettor: compact clients can show a short reminder
	// ShowHints marks a menu that always carries its command list under the
	// "casino_hints once" option: the join menu and an explicit look/status.
	ShowHints bool
}

// MenuCommand is one selectable command shown in a casino menu: the typed
// command text plus a short human-readable description.
type MenuCommand struct {
	Command string
	Desc    string
	Cost    int // additional stake; presentation can mark unaffordable actions
}

type Event struct {
	RoomID         int
	TableID        string
	Type           EventType
	Player         string
	Message        string
	PrivateMessage string
	PrivateTo      string
	Color          string
	Public         bool
	// Snapshot is the optional per-game view attached to the event. A game
	// implements the Snapshot interface for its view type; the presentation
	// layer type-switches on it. Because the field is typed, a new game's
	// snapshot can never be assigned without implementing the interface, and
	// the event filter can test it with a single nil check instead of
	// enumerating every game's field.
	// Settlement is private to PrivateTo, never broadcast to spectators.
	// Message/PrivateMessage remain a plain-text fallback for non-UI consumers.
	Settlement     []SettlementLine
	SettlementNote string // warning displayed alongside a partial settlement
	Snapshot       Snapshot
	Menu           *MenuView
	ShowBalance    bool // append the recipient's current available funds
	Detail         bool // action-by-action public output, only for participants/watchers
}

// Snapshot is the marker interface for a game's structured event view. The
// method is unexported so only types in this package can implement it.
type Snapshot interface{ snapshot() }

type SlotSnapshot struct {
	Grid         [slotGridRows][slotGridReels]string
	StoppedReels int
}

func (*SlotSnapshot) snapshot() {}

// CardView renders one card for any card-based table game.
type CardView struct {
	Rank   string
	Suit   string
	Hidden bool
}

type BlackjackPlayerView struct {
	Name   string
	Cards  []CardView
	Score  string
	Hand   int
	Hands  int
	Bet    int
	Active bool
	Status string
}

type BlackjackSnapshot struct {
	Dealer           []CardView
	DealerShownScore string
	DealerScore      string
	DealerRevealed   bool
	Players          []BlackjackPlayerView
}

func (*BlackjackSnapshot) snapshot() {}

// BlackjackRulesView ships a table's configuration so the presentation layer
// can draw the house-rule felt instead of a raw rules dump.
type BlackjackRulesView struct {
	Config TableConfig
}

func (*BlackjackRulesView) snapshot() {}

// BaccaratBetView lists one participant's wager on a baccarat outcome.
type BaccaratBetView struct {
	Name   string
	Spot   string
	Amount int
}

type BaccaratSnapshot struct {
	Player      []CardView
	Banker      []CardView
	PlayerScore string
	BankerScore string
	Bets        []BaccaratBetView
}

func (*BaccaratSnapshot) snapshot() {}

// BaccaratRulesView ships a table's configuration so the presentation layer
// can draw the house-rule felt instead of a raw rules dump.
type BaccaratRulesView struct {
	Config TableConfig
}

func (*BaccaratRulesView) snapshot() {}

type Participant struct {
	Name        string
	Connected   bool
	HasBet      bool
	Wager       Wager
	Wallet      Wallet
	SittingOut  bool
	SitOutAfter bool
	LeaveAfter  bool
}

// SettlementBalanceNeeded reports whether a settlement should print the seat's
// balance: the seat is leaving, sitting out after the round, or disconnected,
// and the payout did not fail. Shared by every table so the rule lives in one
// place instead of being copy-pasted per game.
func (p *Participant) SettlementBalanceNeeded(payoutFailed bool) bool {
	return !payoutFailed && (p.LeaveAfter || p.SitOutAfter || !p.Connected)
}