Initial commit

game/table-turn.ts

@@ -0,0 +1,44 @@
+import type { GameView } from './engine';
+
+type TurnView = Pick<
+  GameView,
+  | 'status'
+  | 'active'
+  | 'players'
+  | 'decision'
+  | 'battle'
+  | 'response'
+  | 'truthtrance'
+  | 'phaseOpening'
+  | 'automaticContinuationPending'
+>;
+
+/** The single current decision owner for the table banner and seat highlight.
+ * Shared response windows have no single acting seat. Only public view fields
+ * participate; this does not decide which gameplay actions are legal. */
+export function tableActionOwner(g: TurnView): string | null {
+  if (
+    g.status !== 'playing' ||
+    g.automaticContinuationPending ||
+    g.truthtrance ||
+    g.phaseOpening ||
+    g.response
+  )
+    return null;
+  const seated = (id: string | null | undefined) =>
+    g.players.some((p) => p.id === id) ? id! : null;
+  if (g.decision) return seated(g.decision.player);
+  const b = g.battle;
+  if (!b) return seated(g.active);
+  const combatants = [b.attacker, b.defender];
+  const sole = (ids: string[]) => (ids.length === 1 ? seated(ids[0]) : null);
+  if (b.preLeader && !b.preLeader.closed)
+    return sole(combatants.filter((id) => !b.preLeader!.ready.includes(id)));
+  if (b.preparation) return seated(b.preparation.owner);
+  if (!b.revealed) {
+    if (b.fullPlan && !b.submitted.includes(b.fullPlan.target))
+      return seated(b.fullPlan.target);
+    return sole(combatants.filter((id) => !b.submitted.includes(id)));
+  }
+  return sole(b.traitorVoters.filter((id) => !b.traitorSubmitted.includes(id)));
+}