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import 'dart:async';
import 'package:logger/logger.dart';
import 'package:universal_ble/universal_ble.dart';
import 'package:uvok_epaper_badge/control/scanner_controller.dart';
import 'package:uvok_epaper_badge/control/scanner_controller_impl.dart';
import 'package:uvok_epaper_badge/model/device/universal_ble_device.dart';
Logger logger = Logger();
class UniversalBleScannerController extends ScannerControllerImpl {
StreamSubscription<BleDevice>? _subScan;
StreamSubscription<AvailabilityState>? _subAvail;
final List<BleDevice> _devices = [];
UniversalBleScannerController() {
// fuck this limitation, I want an instance method to be called, which doesn't
// work in an initializer.
_subScan = UniversalBle.scanStream.listen(_newDeviceAction);
_subAvail = UniversalBle.availabilityStream.listen(_newAvailabilityAction);
}
void _newDeviceAction(BleDevice dev) {
//logger.i("Found device: ${dev.toString()}");
bool added = _devices.addIf(dev, (exDev) => exDev.deviceId != dev.deviceId);
if (added) {
super.setDevices(
_devices
.map((d) => UniversalBleDevice.fromDevice(d))
.toList(growable: false),
);
}
}
void _newAvailabilityAction(AvailabilityState event) {
super.setAvailability(
event == AvailabilityState.poweredOn
? ScanAvailability.available
: ScanAvailability.unavailable,
);
}
@override
Future<void> startScan({
Duration timeout = const Duration(seconds: 5),
}) async {
AvailabilityState state =
await UniversalBle.getBluetoothAvailabilityState();
if (state != AvailabilityState.poweredOn) return;
_devices.clear();
super.setDevices([]);
super.setStatus(ScanStatus.scanning);
await UniversalBle.startScan();
await Future.delayed(timeout);
await UniversalBle.stopScan();
super.setStatus(ScanStatus.finished);
logger.i("Found ${_devices.length} devices");
}
@override
Future<void> stopScan() async {
await UniversalBle.stopScan();
}
@override
void dispose() {
super.dispose();
stopScan().ignore();
_subScan?.cancel().ignore();
_subAvail?.cancel().ignore();
}
}
extension ListAddExt<T> on List<T> {
/// An element if the predicate is true only for all elements.
/// predicate is passed all existing elements.
bool addIf(T dev, bool Function(T exDev) predicate) {
if (every(predicate)) {
add(dev);
return true;
}
return false;
}
}
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