basic_example.dart

import 'dart:typed_data';
import 'package:flutter_webhid/flutter_webhid.dart';

void main() async {
  if (!WebHID.isSupported) {
    print('WebHID not supported. Try Chrome/Edge 89+');
    return;
  }

  final webHid = WebHID.instance;
  if (webHid == null) {
    print('Failed to access WebHID');
    return;
  }

  print('WebHID Example\n');

  try {
    await _listDevices(webHid);
    await _requestDevice(webHid);
    _listenConnections(webHid);
  } catch (e) {
    print('Error: $e');
  }
}

Future<void> _listDevices(WebHID webHid) async {
  final devices = await webHid.getDevices();
  if (devices.isEmpty) {
    print('No authorized devices\n');
    return;
  }

  print('Authorized devices:');
  for (final device in devices) {
    print('  ${device.productName}');
    print('    VID: 0x${device.vendorId.toRadixString(16).padLeft(4, '0')}');
    print('    PID: 0x${device.productId.toRadixString(16).padLeft(4, '0')}');
  }
  print('');
}

Future<void> _requestDevice(WebHID webHid) async {
  print('Requesting device...');

  try {
    final devices = await webHid.requestDevice(RequestOptions(filters: []));
    if (devices.isEmpty) return;

    final device = devices.first;
    print('Selected: ${device.productName}\n');

    await device.open();
    _printDeviceInfo(device);

    print('Listening for reports (10s)...');
    final sub = device.onInputReport.listen((event) {
      print('Report ${event.reportId}: ${_hex(event.data)}');
    });

    await Future.delayed(Duration(seconds: 10));
    await sub.cancel();

    await device.close();
    print('Device closed\n');
  } on HIDException catch (e) {
    print('HID error: $e\n');
  }
}

void _printDeviceInfo(Device device) {
  print('VID: 0x${device.vendorId.toRadixString(16).padLeft(4, '0')}');
  print('PID: 0x${device.productId.toRadixString(16).padLeft(4, '0')}');
  print('Collections: ${device.collections.length}');

  for (var i = 0; i < device.collections.length; i++) {
    final c = device.collections[i];
    print(
      '  [$i] Usage ${c.usagePage.toRadixString(16)}:${c.usage.toRadixString(16)}',
    );
    if (c.inputReports != null) {
      print('      Input reports: ${c.inputReports!.length}');
    }
  }
  print('');
}

void _listenConnections(WebHID webHid) {
  webHid.onConnect.listen((e) => print('Connected: ${e.device.productName}'));
  webHid.onDisconnect.listen(
    (e) => print('Disconnected: ${e.device.productName}'),
  );
}

String _hex(Uint8List bytes) {
  final s = bytes
      .take(16)
      .map((b) => b.toRadixString(16).padLeft(2, '0'))
      .join(' ');
  return bytes.length > 16 ? '$s... (${bytes.length}B)' : s;
}