fix: make slot payout and stake resolution one durable save

1 files changed, 6 insertions, 5 deletions

diff --git a/internal/casino/machine.go b/internal/casino/machine.go
index 5c73b6f..97b846d 100644
--- a/internal/casino/machine.go
+++ b/internal/casino/machine.go
@@ -277,7 +277,9 @@ func (m *Machine) finishSpin() []Event {
 
 	payFailed := false
 	if payNow > 0 && m.player.Wallet != nil {
-		if err := m.player.Wallet.PayCredits(payNow); err != nil {
+		// Credit the payout and consume the triggering stake in ONE save: a
+		// crash can then never pay the win AND refund the same stake.
+		if err := m.player.Wallet.PayCredits(payNow, m.stakeID); err != nil {
 			// The payout could not be made durable. Do not announce the win as
 			// paid, stop any autobet chain, and keep the stake PENDING
 			// (stakeFailed): the settlement was never durable, so the stake is
@@ -334,10 +336,9 @@ func (m *Machine) finishSpin() []Event {
 	} else {
 		m.inFreeSpins = false
 		if !payFailed && m.player.Wallet != nil {
-			// The paid round fully resolved (the feature either never
-			// started or just completed; free spins wager nothing): consume
-			// ONLY this round's stake, leaving an older failed-payout stake
-			// pending.
+			// A win already consumed this round's stake inside PayCredits; a
+			// loss (payNow == 0) has not, so consume it here. Either way the
+			// round is over and the stake must not be refunded.
 			m.player.Wallet.ResolveStake(m.stakeID)
 			m.stakeID = ""
 			m.stakeFailed = false