// ignore_for_file: invalid_use_of_protected_member

part of '../../registration_page.dart';

extension _RegistrationScanPart on _RegistrationPageState {
  void _startScanListening() {
    _scanSubscription ??= _scannerService.scanResults.listen(_onScan);
  }

  Future<void> _stopScanListening() async {
    final subscription = _scanSubscription;
    _scanSubscription = null;
    await subscription?.cancel();
  }

  void _restartScanListening() {
    _scanSubscription?.cancel();
    _scanSubscription = null;
    _startScanListening();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (mounted) {
        _focusNode.requestFocus();
      }
    });
  }

  void _onKeyEvent(KeyEvent event) {
    if (event is! KeyDownEvent) return;
    if (_isLockToggleKey(event)) {
      _cycleMode();
      return;
    }
    if (event.logicalKey == LogicalKeyboardKey.enter) {
      _submit();
    }
  }

  bool _isLockToggleKey(KeyEvent event) {
    final key = event.logicalKey;
    return key == LogicalKeyboardKey.select ||
        key == LogicalKeyboardKey.gameButtonRight1;
  }

  void _onScan(ScanResult result) {
    final parsed = CodeParser.parse(result.barcode);
    switch (parsed.type) {
      case CodeType.zongpaiNo:
        _handleZongpaiScan(parsed.value);
      case CodeType.locationNormal:
      case CodeType.locationTransit:
        _handleLocationScan(parsed.value, parsed.type);
      case CodeType.invalid:
        _feedbackService.trigger(FeedbackEvent.scanInvalid);
        _showStatusOverride(
          '无效码：${result.barcode}',
          StatusDotColor.red,
          const Duration(seconds: 2),
        );
    }
  }

  void _handleLocationScan(String locationCode, CodeType locationType) {
    // In singleCode mode or no existing data, switch directly
    if (_mode == RegistrationMode.singleCode || _zongpaiNos.isEmpty) {
      _feedbackService.trigger(FeedbackEvent.scanValid);
      setState(() {
        _locationCode = locationCode;
        _locationType = locationType;
        _clearStatusOverride();
      });
      return;
    }

    // In multiCode mode with existing data, confirm before switching
    _showLocationSwitchDialog(locationCode, locationType);
  }

  void _handleZongpaiScan(String zongpaiNo) {
    // If cross-paicha dialog is showing, just vibrate and discard
    if (_crossPaichaPending) {
      _triggerDoubleVibration();
      return;
    }

    // In multiCode mode with existing data, check for cross-paicha scan
    if (_mode == RegistrationMode.multiCode &&
        _zongpaiNos.isNotEmpty &&
        _overview?.success == true &&
        !_overview!.items.any((item) => item.zongpaiNo == zongpaiNo)) {
      _crossPaichaPending = true;
      _triggerDoubleVibration();
      _showCrossPaichaDialog(zongpaiNo);
      return;
    }

    final shouldRefresh = _overviewZongpaiNo != zongpaiNo;
    _feedbackService.trigger(FeedbackEvent.scanValid);
    setState(() {
      if (_mode == RegistrationMode.multiCode) {
        if (!_zongpaiNos.contains(zongpaiNo)) {
          _zongpaiNos.add(zongpaiNo);
        }
      } else {
        if (_zongpaiNos.isEmpty) {
          _zongpaiNos.add(zongpaiNo);
        } else {
          _zongpaiNos[0] = zongpaiNo;
        }
      }
      _clearStatusOverride();
    });
    if (shouldRefresh) {
      _loadOverview(zongpaiNo);
    }
  }

  void _triggerDoubleVibration() {
    Vibration.vibrate(pattern: [0, 200, 100, 200]);
  }

  void _removeZongpai(String zongpaiNo) {
    setState(() {
      _zongpaiNos.remove(zongpaiNo);
    });
  }
}