バーコードスキャナーの統合

data class CaptureEvent(
  val value: String,
  val symbology: String?,
  val capturedAt: Instant,
)

interface CapturePort {
  fun open()
  fun start()
  fun stop()
  fun close()
  fun setListener(listener: (CaptureEvent) -> Unit)
}

class ScanWorkflow(private val scanner: CapturePort) {
  private var active = false

  fun begin(onCapture: (CaptureEvent) -> Unit) {
    if (active) return
    scanner.open()
    scanner.setListener(onCapture)
    scanner.start()
    active = true
  }

  fun end() {
    if (!active) return
    runCatching { scanner.stop() }
    runCatching { scanner.close() }
    active = false
  }
}