Khái niệm cơ bản về quy trình làm việc của máy in

data class PrintJob(
  val title: String,
  val lines: List<String>,
  val barcode: String?,
)

sealed interface PrintResult {
  data object Printed : PrintResult
  data class Blocked(val reason: String) : PrintResult
  data class Failed(val reason: String) : PrintResult
}

interface PrintPort {
  suspend fun print(job: PrintJob): PrintResult
}

suspend fun runPrint(port: PrintPort, job: PrintJob): PrintResult =
  runCatching { port.print(job) }
    .getOrElse { PrintResult.Failed("driver-error") }