feat: single-owner game state, transactional lifecycle, durable money on server stop

1 files changed, 43 insertions, 5 deletions

diff --git a/internal/casino/machine.go b/internal/casino/machine.go
index 64dcfd4..6a7b7aa 100644
--- a/internal/casino/machine.go
+++ b/internal/casino/machine.go
@@ -2,6 +2,7 @@ package casino
 
 import (
 	"fmt"
+	"math"
 	"math/rand"
 	"sync"
 )
@@ -100,8 +101,8 @@ func (m *Machine) start(name string, wallet Wallet) []Event {
 }
 
 func (m *Machine) beginSpinLocked(name string, amount int, wallet Wallet, publicMessage, privateMessage string) []Event {
-	if _, ok := wallet.Wager(amount); !ok {
-		return m.private("You don't have enough chips and credits for that bet.")
+	if _, err := wallet.Wager(amount); err != nil {
+		return m.private(walletErrorMessage(err, "You don't have enough chips and credits for that bet."))
 	}
 	m.bet = amount
 	m.spinBet = amount
@@ -203,9 +204,9 @@ func (m *Machine) autoBetTick() []Event {
 			m.autoBet = false
 			return m.private("Autobet stopped: no wager is set.")
 		}
-		if _, ok := m.player.Wallet.Wager(m.bet); !ok {
+		if _, err := m.player.Wallet.Wager(m.bet); err != nil {
 			m.autoBet = false
-			return m.private("Autobet stopped: you don't have enough chips and credits for that bet.")
+			return m.private(walletErrorMessage(err, "Autobet stopped: you don't have enough chips and credits for that bet."))
 		}
 		m.spinBet = m.bet
 		m.spin = generateSlotSpinWithProfile(m.rng, m.spinBet, m.profile)
@@ -220,7 +221,12 @@ func (m *Machine) autoBetTick() []Event {
 func (m *Machine) finishSpin() []Event {
 	events := []Event{}
 	result := m.spin.Payout + m.payoutRemainder
-	credits := int(result)
+	// Checked conversion: a runaway profile or overflow must clamp at the
+	// economy cap instead of wrapping through a machine-sized int.
+	if result > MaxCredits || result != result || result < 0 {
+		result = MaxCredits
+	}
+	credits := int(math.Floor(result))
 	m.payoutRemainder = result - float64(credits)
 	if credits > 0 && m.player.Wallet != nil {
 		m.player.Wallet.PayCredits(credits)
@@ -380,3 +386,35 @@ func (m *Machine) privateMenu(prefix string) []Event {
 func (m *Machine) menuEvents(prefix string) []Event {
 	return m.privateMenu(prefix)
 }
+
+// refundAll refunds any committed stake at graceful shutdown. Locked.
+func (m *Machine) refundAll() []Event {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.player == nil || m.player.Wallet == nil || m.spinBet <= 0 {
+		return nil
+	}
+	name, refund := m.player.Name, m.spinBet
+	wallet := m.player.Wallet
+	m.spinBet = 0
+	m.bet = 0
+	if err := wallet.PayCredits(refund); err != nil {
+		return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult,
+			PrivateTo: name, Player: name,
+			PrivateMessage: "Shutdown refund could not be persisted; the stake is recorded for recovery.",
+			Color:          "casino_action", Public: false}}
+	}
+	return []Event{{RoomID: m.RoomID, TableID: m.Config.ID, Type: EventResult,
+		PrivateTo: name, Player: name,
+		Message:        fmt.Sprintf("%s is refunded %d credits as the casino closes.", name, refund),
+		PrivateMessage: fmt.Sprintf("The house refunds your %d credit stake for the shutdown.", refund),
+		Color:          "casino_action", Public: true}}
+}
+
+// idle reports whether no player is seated: only an idle machine may have
+// its live rules replaced by new room configuration.
+func (m *Machine) idle() bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.player == nil
+}