fix: telnet buffer reuse, bank stack handling,

 transport casino gate, and admin cache invalidation

1 files changed, 13 insertions, 3 deletions

diff --git a/internal/casino/machine.go b/internal/casino/machine.go
index 2f8b753..15c612d 100644
--- a/internal/casino/machine.go
+++ b/internal/casino/machine.go
@@ -26,6 +26,7 @@ type Machine struct {
 	reel            int
 	clock           int
 	freeSpins       int
+	inFreeSpins     bool
 	spinBet         int
 	payoutRemainder float64
 	profile         SlotProfile
@@ -237,8 +238,13 @@ func (m *Machine) finishSpin() []Event {
 		winEvents[0].Color = "casino_win"
 		events = append(events, winEvents...)
 	}
-	if m.spin.ScatterCount >= 3 && m.freeSpins == 0 {
+	// A paid feature in progress never retriggers: scatters landing during a
+	// free spin are ignored, matching the CalculateRTP model (the feature is
+	// a fixed number of automatic spins). Retriggering only on a paid spin
+	// keeps the machine's actual return aligned with that model.
+	if m.spin.ScatterCount >= 3 && m.freeSpins == 0 && !m.inFreeSpins {
 		m.freeSpins = m.profile.FreeSpinCount
+		m.inFreeSpins = true
 		events = append(events, m.public(fmt.Sprintf("Three scatter symbols trigger %d free spins!", m.profile.FreeSpinCount))...)
 	}
 	if m.freeSpins > 0 {
@@ -247,8 +253,11 @@ func (m *Machine) finishSpin() []Event {
 		m.spin = generateSlotSpinWithProfile(m.rng, m.spinBet, m.profile)
 		m.reel, m.clock, m.suspense = 0, 0, false
 		events = append(events, m.public(fmt.Sprintf("%d free spins remain.", m.freeSpins))...)
-	} else if !m.autoBet {
-		events = append(events, m.menuEvents("")...)
+	} else {
+		m.inFreeSpins = false
+		if !m.autoBet {
+			events = append(events, m.menuEvents("")...)
+		}
 	}
 	return events
 }
@@ -277,6 +286,7 @@ func (m *Machine) resetSeat() {
 	m.phase = machineReady
 	m.reel, m.clock, m.suspense = 0, 0, false
 	m.freeSpins = 0
+	m.inFreeSpins = false
 	m.payoutRemainder = 0
 	m.autoBet, m.autoCountdown = false, 0
 }