import type { mssql } from '@cityssm/mssql-multi-pool'

const tableId = 'SRISYSID'

/**
 * Returns the last used system id.
 * @param transaction - An open database transaction.
 * @returns - The last used system id.
 */
export async function getLastSystemId(
  transaction: mssql.Transaction
): Promise<`${number}` | undefined> {
  const idResult = (await transaction
    .request()
    .input('tableId', tableId)
    .query(
      'select Last_Id as systemId from AUTO_KEYS where Table_Id = @tableId'
    )) as mssql.IResult<{ systemId: `${number}` }>

  if (idResult.recordset.length > 0) {
    return idResult.recordset[0].systemId
  }

  return undefined
}

/**
 * Increments the last used system id.
 * @param transaction - An open database transaction.
 */
export async function incrementLastSystemId(
  transaction: mssql.Transaction
): Promise<void> {
  await transaction
    .request()
    .input('tableId', tableId)
    .query(
      'UPDATE AUTO_KEYS SET LAST_ID = LAST_ID + 1 WHERE TABLE_ID = @tableId'
    )
}