booking operations and trains scheduling also allocations

apps/edr-freight-api/src/modules/scheduling/compare-scheduling-priority.util.ts

@@ -0,0 +1,19 @@
+export interface SchedulingPriorityBooking {
+  isGovernment?: boolean;
+  priorityScore?: number | null;
+  scheduledDate: Date | string;
+}
+
+/** Government first, then priority score, then earliest scheduled date. */
+export function compareSchedulingPriority(
+  a: SchedulingPriorityBooking,
+  b: SchedulingPriorityBooking,
+): number {
+  const govDiff = Number(Boolean(b.isGovernment)) - Number(Boolean(a.isGovernment));
+  if (govDiff !== 0) return govDiff;
+
+  const priorityDiff = (b.priorityScore ?? 0) - (a.priorityScore ?? 0);
+  if (priorityDiff !== 0) return priorityDiff;
+
+  return new Date(a.scheduledDate).getTime() - new Date(b.scheduledDate).getTime();
+}