feat: full wagon cancel, leg board, wagon dates

feat(freight): editable train leg times, SL invoice payer

apps/edr-freight-api/src/modules/shipping-lines/shipping-line-booking-completion.service.ts

@@ -10,6 +10,8 @@ import { In, Repository } from "typeorm";
 import { BookingPricingService } from "../bookings/booking-pricing.service";
 import { BookingTransitionService } from "../bookings/booking-transition.service";
 import { BookingsService } from "../bookings/bookings.service";
+import type { Container20ftUnit } from "../bookings/container-pairing.util";
+import { ContainerValidationService } from "../bookings/container-validation.service";
 import { BookingContainer } from "../bookings/entities/booking-container.entity";
 import { BookingContainerUnit } from "../bookings/entities/booking-container-unit.entity";
 import { Booking } from "../bookings/entities/booking.entity";
@@ -57,8 +59,35 @@ export class ShippingLineBookingCompletionService {
     private readonly trainSchedulingService: TrainSchedulingService,
     private readonly bookingBatchService: BookingBatchService,
     private readonly creditsService: ShippingLineCreditsService,
+    private readonly containerValidationService: ContainerValidationService,
   ) {}
 
+  /**
+   * 20ft weight-pairing check over the completion payload — the same rule the
+   * customer shipment form enforces (`max20ftPairWeightDiffTons`, default 10t):
+   * two 20ft sharing a wagon must be within the cap. Preview surfaces the
+   * messages; completion hard-blocks on them. Runs off the DTO so nothing is
+   * persisted before the check passes.
+   */
+  private async pairingViolationMessages(
+    dto: CompleteShippingLineBookingDto,
+  ): Promise<string[]> {
+    const units: Container20ftUnit[] = [];
+    for (const line of dto.containers ?? []) {
+      const containerType = await this.resolveContainerType(line);
+      if (containerType.sizeFt !== 20) continue;
+      (line.units ?? []).forEach((u, idx) =>
+        units.push({
+          label: u.containerNumber || `20ft-${idx + 1}`,
+          grossWeightTons: Number(u.vgmTons ?? 0),
+        }),
+      );
+    }
+    const violations =
+      await this.containerValidationService.validate20ftPairingUnits(units);
+    return violations.map((v) => v.message);
+  }
+
   /** Same session→owner resolution every shipping-line entry point uses. */
   private async requireShippingLine(userId: string) {
     const shippingLine =
@@ -193,6 +222,17 @@ export class ShippingLineBookingCompletionService {
       );
     }
 
+    // Unbalanced 20ft pairs can never be planned onto wagons — refuse before
+    // any cargo/credit write below. Same block the contract path applies.
+    if (booking.freightType === "CONTAINER") {
+      const pairing = await this.pairingViolationMessages(dto);
+      if (pairing.length) {
+        throw new BadRequestException(
+          `Cannot complete booking — 20ft containers cannot be paired on wagons: ${pairing.join(" ")}`,
+        );
+      }
+    }
+
     // Completion is booking time. A lane with trains DEDICATED to this line
     // has no window concept at all: the line books whenever it wants until the
     // train's close offset. Only a lane with no dedicated train falls back to
@@ -526,11 +566,21 @@ export class ShippingLineBookingCompletionService {
       computed.appliedModifiers,
     );
 
+    // Pairing is reported, not thrown: the confirm modal shows it next to the
+    // price (as the customer form does) and disables confirm; /complete
+    // hard-blocks the same payload.
+    const pairingErrors =
+      booking.freightType === "CONTAINER"
+        ? await this.pairingViolationMessages(dto)
+        : [];
+
     return {
       totalAmount: computed.totalAmount,
       currency: computed.currency,
       lineItems: computed.lineItems,
       warnings: computed.warnings,
+      overweightLines: computed.overweightLines,
+      pairingErrors,
     };
   }