leg-aware capacity and wagon sharing

apps/edr-freight-api/src/modules/train-scheduling/train-scheduling.service.ts

@@ -4139,6 +4139,7 @@ export class TrainSchedulingService {
       fittingBookings,
       dto.originStationId,
       dto.destinationStationId,
+      stops,
     );
 
     violations.push(
@@ -4185,6 +4186,8 @@ export class TrainSchedulingService {
           wagonPlan,
           containerPlacements,
           placementRules,
+          legByBookingId,
+          Math.max(1, stops.length - 1),
         ),
       );
       violations.push(
@@ -5011,6 +5014,7 @@ export class TrainSchedulingService {
     bookings: Booking[],
     scheduleOriginYardId: string,
     scheduleDestinationYardId: string,
+    stops: string[],
   ): void {
     const bookingById = new Map(bookings.map((b) => [b.id, b]));
     for (const slot of wagonPlan) {
@@ -5026,13 +5030,33 @@ export class TrainSchedulingService {
           b.originYardId === first.originYardId &&
           b.destinationYardId === first.destinationYardId,
       );
-      if (!sameCorridor) continue;
-      slot.boardYardId =
-        first.originYardId === scheduleOriginYardId ? null : first.originYardId;
-      slot.alightYardId =
-        first.destinationYardId === scheduleDestinationYardId
-          ? null
-          : first.destinationYardId;
+      if (sameCorridor) {
+        slot.boardYardId =
+          first.originYardId === scheduleOriginYardId ? null : first.originYardId;
+        slot.alightYardId =
+          first.destinationYardId === scheduleDestinationYardId
+            ? null
+            : first.destinationYardId;
+        continue;
+      }
+      // Mixed corridors on one wagon (cross-leg TEU sharing): the wagon rides
+      // the UNION of its cargo legs. A yard missing from the stop list keeps
+      // the slot on the whole route so capacity is never under-occupied.
+      let from = Number.POSITIVE_INFINITY;
+      let to = Number.NEGATIVE_INFINITY;
+      for (const b of slotBookings) {
+        const f = stops.indexOf(b.originYardId);
+        const t = stops.indexOf(b.destinationYardId);
+        if (f < 0 || t <= f) {
+          from = Number.POSITIVE_INFINITY;
+          break;
+        }
+        from = Math.min(from, f);
+        to = Math.max(to, t);
+      }
+      if (!Number.isFinite(from) || to <= from) continue;
+      slot.boardYardId = from === 0 ? null : stops[from];
+      slot.alightYardId = to === stops.length - 1 ? null : stops[to];
     }
   }