import { BadRequestException } from '@nestjs/common';

import { CARGO_CONDITIONS, CargoCondition, FREIGHT_TYPES, FreightType } from './entities/booking.entity';
import { BookingFreightShapeInput } from './dto/validators/booking-freight.validator';

/** Normalize and validate booking freight shape (used on create and after update merge). */
export function assertFreightShape(input: BookingFreightShapeInput): void {
  if (!input.freightType || !FREIGHT_TYPES.includes(input.freightType as FreightType)) {
    throw new BadRequestException(
      `freightType is required and must be one of: ${FREIGHT_TYPES.join(', ')}`,
    );
  }
  //

  const condition = input.cargoCondition ?? 'LADEN';
  if (!CARGO_CONDITIONS.includes(condition as CargoCondition)) {
    throw new BadRequestException(
      `cargoCondition must be one of: ${CARGO_CONDITIONS.join(', ')}`,
    );
  }

  const containers = input.containers ?? [];
  const hasContainers = containers.length > 0;
  const hasCargoType = Boolean(input.cargoTypeId);

  // Empty means bare equipment: there is no commodity to name, and bulk has no
  // equipment of its own to move, so EMPTY only ever rides CONTAINER freight.
  if (condition === 'EMPTY' && input.freightType !== 'CONTAINER') {
    throw new BadRequestException(
      'An empty booking must be CONTAINER freight — bulk carries no equipment',
    );
  }

  if (input.freightType === 'BULK') {
    if (hasContainers) {
      throw new BadRequestException(
        'BULK freight cannot include container lines; use cargoTypeId only',
      );
    }
    if (!hasCargoType) {
      throw new BadRequestException('cargoTypeId is required for BULK freight');
    }
    return;
  }

  if (hasCargoType) {
    throw new BadRequestException('cargoTypeId is not allowed for CONTAINER freight');
  }
  if (!hasContainers) {
    throw new BadRequestException(
      'CONTAINER freight requires at least one container line with containerTypeId',
    );
  }
  for (const line of containers) {
    if (!line.containerTypeId) {
      throw new BadRequestException('Each container line must include containerTypeId');
    }
  }
}