import { MigrationInterface, QueryRunner, Table, TableForeignKey } from 'typeorm';

/**
 * Create freight.last_mile_requests — the pre-approval confirmation stage that
 * sits in front of freight.last_mile: a train departs Djibouti, the customer
 * confirms which containers go via EDR last-mile, and the Truck & Machinery
 * chief approves/rejects before a freight.last_mile execution record exists.
 */
export class CreateLastMileRequests3250000000000 implements MigrationInterface {
  public async up(queryRunner: QueryRunner): Promise<void> {
    const exists = await queryRunner.hasTable('freight.last_mile_requests');
    if (exists) return;

    await queryRunner.createTable(
      new Table({
        name: 'freight.last_mile_requests',
        columns: [
          { name: 'id', type: 'uuid', isPrimary: true, default: 'gen_random_uuid()' },
          { name: 'booking_id', type: 'uuid', isNullable: false },
          { name: 'train_schedule_id', type: 'uuid', isNullable: false },
          {
            name: 'status',
            type: 'varchar',
            length: '30',
            default: `'AWAITING_CONFIRMATION'`,
            isNullable: false,
          },
          { name: 'requested_container_numbers', type: 'text', isArray: true, isNullable: true },
          { name: 'reminder_sent_at', type: 'timestamptz', isNullable: true },
          { name: 'submitted_by_user_id', type: 'uuid', isNullable: true },
          { name: 'submitted_at', type: 'timestamptz', isNullable: true },
          { name: 'reviewed_by_staff_id', type: 'uuid', isNullable: true },
          { name: 'reviewed_at', type: 'timestamptz', isNullable: true },
          { name: 'rejection_reason', type: 'text', isNullable: true },
          { name: 'resulting_last_mile_id', type: 'uuid', isNullable: true },
          { name: 'created_at', type: 'timestamptz', default: 'now()' },
          { name: 'updated_at', type: 'timestamptz', default: 'now()' },
          { name: 'deleted_at', type: 'timestamptz', isNullable: true },
        ],
      }),
      true,
    );

    await queryRunner.createForeignKey(
      'freight.last_mile_requests',
      new TableForeignKey({
        columnNames: ['booking_id'],
        referencedTableName: 'freight.bookings',
        referencedColumnNames: ['id'],
        onDelete: 'CASCADE',
      }),
    );
    await queryRunner.createForeignKey(
      'freight.last_mile_requests',
      new TableForeignKey({
        columnNames: ['train_schedule_id'],
        referencedTableName: 'freight.train_schedules',
        referencedColumnNames: ['id'],
        onDelete: 'CASCADE',
      }),
    );
    await queryRunner.createForeignKey(
      'freight.last_mile_requests',
      new TableForeignKey({
        columnNames: ['resulting_last_mile_id'],
        referencedTableName: 'freight.last_mile',
        referencedColumnNames: ['id'],
        onDelete: 'SET NULL',
      }),
    );

    // One request per booking per departure — remind()/submit() are idempotent on this.
    await queryRunner.query(
      `CREATE UNIQUE INDEX IF NOT EXISTS "IDX_last_mile_requests_booking_schedule" ON "freight"."last_mile_requests" ("booking_id", "train_schedule_id") WHERE "deleted_at" IS NULL`,
    );
    await queryRunner.query(
      `CREATE INDEX IF NOT EXISTS "IDX_last_mile_requests_status" ON "freight"."last_mile_requests" ("status")`,
    );
  }

  public async down(queryRunner: QueryRunner): Promise<void> {
    const exists = await queryRunner.hasTable('freight.last_mile_requests');
    if (exists) {
      await queryRunner.dropTable('freight.last_mile_requests');
    }
  }
}