import { MigrationInterface, QueryRunner } from "typeorm";

/**
 * Export cargo reaches a train two ways, and until now only one was modelled.
 *
 * DIRECT_TO_TRAIN — the customer's truck pulls alongside and the cargo goes
 * straight onto the wagon. It never enters a warehouse, so no GRN is ever
 * raised; the Carriage Acceptance Sheet is the only document handed over.
 *
 * WAREHOUSE — cargo is received into the warehouse, GRN'd, then loaded. This is
 * the existing flow and stays gated on the GRN.
 *
 * NULL means WAREHOUSE, so existing rows keep today's behaviour with no backfill.
 */
export class BookingExportHandoverMode3370000000000 implements MigrationInterface {
  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      ALTER TABLE freight.bookings
        ADD COLUMN IF NOT EXISTS export_handover_mode varchar(20)
    `);
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(`
      ALTER TABLE freight.bookings DROP COLUMN IF EXISTS export_handover_mode
    `);
  }
}