improving the UI side of ptz... and improving the way turns works with UI....

server/src/services/turnService/display.js

@@ -0,0 +1,41 @@
+const { TURN_DURATION_MS, IDLE_TIMEOUT_MS } = require('./constants');
+
+const labels = {
+  waiting: 'Someone else is driving',
+  handoff: 'It’s your turn!',
+  active: 'You’re driving',
+  idleWarning: 'Start driving or your turn will be skipped',
+  activeTimer: 'Your turn',
+  waitingTimer: 'Waiting',
+  untilTurn: 'until your turn',
+  timeRemaining: 'left',
+  showTimer: 'Show turn timer',
+  hideTimer: 'Hide turn timer',
+  showName: 'Show rover name',
+  hideName: 'Hide rover name',
+};
+
+// Build this from visibility-filtered session data so private rover state stays private.
+function buildRoverTurn({ rover, mode, socketId, turnInfo, activeDriverId }) {
+  const queue = turnInfo?.queue || [];
+  // Direct ownership can arrive before queue details on load/reconnect.
+  const currentDriverId = activeDriverId || turnInfo?.current || null;
+  const currentIndex = currentDriverId ? queue.indexOf(currentDriverId) : -1;
+  const userIndex = socketId ? queue.indexOf(socketId) : -1;
+  const enabled = mode === 'turns' && queue.length > 1 && currentIndex >= 0 && userIndex >= 0;
+  const turnsAhead = enabled ? (userIndex - currentIndex + queue.length) % queue.length : null;
+  return {
+    target: { id: rover.id, name: rover.name, color: rover.color, fallback: rover.id },
+    enabled,
+    isActive: turnsAhead === 0,
+    turnsAhead,
+    queueLength: queue.length,
+    deadline: turnInfo?.deadline || null,
+    durationMs: TURN_DURATION_MS,
+    idleDeadline: turnInfo?.idleDeadline || null,
+    idleGraceMs: IDLE_TIMEOUT_MS,
+    labels,
+  };
+}
+
+module.exports = { buildRoverTurn };