implement booking flow

apps/edr-freight-api/src/modules/bookings/dto/validators/booking-freight.validator.ts

@@ -0,0 +1,60 @@
+import {
+  ValidationArguments,
+  ValidatorConstraint,
+  ValidatorConstraintInterface,
+} from 'class-validator';
+
+import { FREIGHT_TYPES, FreightType } from '../../entities/booking.entity';
+
+export interface BookingFreightShapeInput {
+  freightType?: string;
+  cargoTypeId?: string | null;
+  containers?: Array<{ containerTypeId?: string }> | null;
+}
+
+@ValidatorConstraint({ name: 'BookingFreightShape', async: false })
+export class BookingFreightShapeConstraint implements ValidatorConstraintInterface {
+  validate(_value: unknown, args: ValidationArguments): boolean {
+    const dto = args.object as BookingFreightShapeInput;
+    if (!dto.freightType || !FREIGHT_TYPES.includes(dto.freightType as FreightType)) {
+      return true;
+    }
+
+    const containers = dto.containers ?? [];
+    const hasContainers = containers.length > 0;
+    const hasCargoType =
+      dto.cargoTypeId !== undefined &&
+      dto.cargoTypeId !== null &&
+      String(dto.cargoTypeId).trim() !== '';
+
+    if (dto.freightType === 'BULK') {
+      if (hasContainers) return false;
+      if (!hasCargoType) return false;
+      return true;
+    }
+
+    if (dto.freightType === 'CONTAINER') {
+      if (hasCargoType) return false;
+      if (!hasContainers) return false;
+      return containers.every(
+        (c) =>
+          c.containerTypeId !== undefined &&
+          c.containerTypeId !== null &&
+          String(c.containerTypeId).trim() !== '',
+      );
+    }
+
+    return true;
+  }
+
+  defaultMessage(args: ValidationArguments): string {
+    const dto = args.object as BookingFreightShapeInput;
+    if (dto.freightType === 'BULK') {
+      return 'BULK freight requires cargoTypeId and must not include container lines';
+    }
+    if (dto.freightType === 'CONTAINER') {
+      return 'CONTAINER freight requires at least one container line with containerTypeId and must not include cargoTypeId';
+    }
+    return 'Invalid freight type shape';
+  }
+}