import { MigrationInterface, QueryRunner } from 'typeorm';

/**
 * Marks a train schedule whose booking-window rule was configured by staff at
 * creation rather than inherited from the live global rules.
 *
 * Without this flag `restampPendingWindows` — which re-derives EVERY still
 * PRE_WINDOW schedule from the current global config after a global-rules edit —
 * would silently overwrite those hand-picked settings, which is precisely what
 * the per-schedule configuration exists to prevent.
 *
 * Defaults false, so every existing schedule keeps following the global rules.
 */
export class AddScheduleWindowRuleCustom3200000000000 implements MigrationInterface {
  name = 'AddScheduleWindowRuleCustom3200000000000';

  public async up(queryRunner: QueryRunner): Promise<void> {
    await queryRunner.query(
      `ALTER TABLE "freight"."train_schedules" ADD COLUMN IF NOT EXISTS "window_rule_custom" boolean NOT NULL DEFAULT false`,
    );
  }

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