1 files changed, 24 insertions, 0 deletions
diff --git a/internal/casino/betting.go b/internal/casino/betting.go
index 3ffee88..fa2d2dc 100644
--- a/internal/casino/betting.go
+++ b/internal/casino/betting.go
@@ -12,6 +12,30 @@ func (c *countdown) stop()           { c.clock, c.deadline = 0, 0 }
 func (c *countdown) tick()           { c.clock++ }
 func (c *countdown) expired() bool   { return c.deadline > 0 && c.clock >= c.deadline }
 
+// bettingWindow is the timed betting phase shared by multiplayer table games.
+// The owning table opens it when the first wager lands with multiple seated
+// players and decides the outcome (deal/resolve vs reset) from advance.
+type bettingWindow struct {
+	timer countdown
+}
+
+func (w *bettingWindow) open(ticks int) { w.timer.start(ticks) }
+func (w *bettingWindow) close()         { w.timer.stop() }
+
+// advance moves the window one tick. pending means the window is still open;
+// otherwise resolve reports whether wagers are down and the round should play
+// out, and sitOuts names the seated players who never bet.
+func (w *bettingWindow) advance(seats []*Participant) (sitOuts []string, resolve, pending bool) {
+	w.timer.tick()
+	if allBet(seats) {
+		return nil, true, false
+	}
+	if !w.timer.expired() {
+		return nil, false, true
+	}
+	return sitOutNames(seats), anyBet(seats), false
+}
+
 // allBet reports whether at least one connected participant exists and every
 // connected participant has placed a bet. Disconnected participants never
 // hold a round open.