import 'dart:async';

import 'package:auto_route/auto_route.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_blue_plus_windows/flutter_blue_plus_windows.dart';

@RoutePage()
class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return const HomeScreen();
  }
}

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  List<BluetoothDevice> _systemDevices = [];
  List<ScanResult> _scanResults = [];
  bool _isScanning = false;
  late StreamSubscription<List<ScanResult>> _scanResultsSubscription;
  late StreamSubscription<bool> _isScanningSubscription;

  bool _connected = false;
  bool _found = false;

  BluetoothDevice? device;

  List<BluetoothService> _services = [];

  Future<void> scanDevices() async {
    if (await FlutterBluePlus.isSupported == false) {
      print("Bluetooth not supported by this device");
      return;
    }
    final scannedDevices = <ScanResult>{};

    const timeout = Duration(seconds: 3);
    await FlutterBluePlus.startScan(timeout: timeout);

    final sub =
        FlutterBluePlus.scanResults.expand((e) => e).listen(scannedDevices.add);

    // await Future.delayed(timeout);
    sub.cancel();
    scannedDevices.forEach(print);
    print('Scanned devices: ${scannedDevices.length}');
  }

  @override
  void initState() {
    super.initState();

    _scanResultsSubscription = FlutterBluePlus.scanResults.listen((results) {
      _scanResults = results;
      if (mounted) {
        setState(() {});
      }
    }, onError: (e) {
      print('Scan Results Subscription Error: $e');
    });

    _isScanningSubscription = FlutterBluePlus.isScanning.listen((state) {
      _isScanning = state;
      if (mounted) {
        setState(() {});
      }
    });
  }

  @override
  void dispose() {
    _scanResultsSubscription.cancel();
    _isScanningSubscription.cancel();
    super.dispose();
  }

  Future onScanPressed() async {
    try {
      _systemDevices = await FlutterBluePlus.systemDevices([]);
    } catch (e) {
      print('System Devices Error: $e');
    }

    try {
      await FlutterBluePlus.startScan(timeout: const Duration(seconds: 15));
    } catch (e) {
      print('Start Scan Error: $e');
    }

    if (mounted) {
      setState(() {});
    }
  }

  Future onConnectPressed() async {
    try {
      _systemDevices = await FlutterBluePlus.systemDevices([]);
    } catch (e) {
      print('System Devices Error: $e');
    }

    try {
      await FlutterBluePlus.startScan(timeout: const Duration(seconds: 15));
    } catch (e) {
      print('Start Scan Error: $e');
    }

    FlutterBluePlus.scanResults.listen((results) async {
      for (ScanResult r in results) {
        if (kDebugMode) {
          print(r);
        }

        if (r.device.advName == "Go Bluetooth") {
          await FlutterBluePlus.stopScan();
          device = r.device;

          print("FOUND BLUETOOTH DEVICE");

          await device?.connect();

          try {
            _services = await device?.discoverServices() ?? [];
          } catch (e) {
            print("Discover Services Error: $e");
          }

          if (mounted) {
            setState(() {
              _connected = true;
            });
          }
        }
      }
    });
  }

  Future onStopPressed() async {
    try {
      FlutterBluePlus.stopScan();
    } catch (e) {
      print('Stop Scan Error: $e');
    }
  }

  Future onRefresh() {
    if (_isScanning == false) {
      FlutterBluePlus.startScan(timeout: const Duration(seconds: 15));
    }
    if (mounted) {
      setState(() {});
    }
    return Future.delayed(const Duration(milliseconds: 500));
  }

  Future<void> handleDisconnect() async {
    await device?.disconnect();
  }

  Future onDisconnectPressed() async {
    await handleDisconnect();
    setState(() {
      _connected = false;
    });
  }

  @override
  Future<void> deactivate() async {
    super.deactivate();
    await handleDisconnect();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('XIAO Sense'),
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            // ListView.builder(
            //   shrinkWrap: true,
            //   physics: const NeverScrollableScrollPhysics(),
            //   itemCount: _scanResults.length,
            //   itemBuilder: (context, index) {
            //     return ListTile(
            //       title: Text(_scanResults[index].device.remoteId.toString()),
            //       subtitle: Text(_scanResults[index].device.advName),
            //     );
            //   },
            // ),
            if (_connected) Text('Connected!'),
            ElevatedButton(
              // enabled: !_isScanning,
              onPressed: () async {
                // await Future<void>.delayed(const Duration(seconds: 2));
                // onScanPressed();
                if (_connected) {
                  onDisconnectPressed();
                } else {
                  onConnectPressed();
                }
              },
              // icon: _isScanning
              //     ? const SizedBox.square(
              //         dimension: 16,
              //         child: CircularProgressIndicator(),
              //       )
              //     : null,
              child: _isScanning
                  ? const Text('Please wait')
                  : _connected
                      ? const Text('Disconnect')
                      : const Text('Connect'),
            ),
            ElevatedButton(
              onPressed: () async {
                print('Toggle LED');
                print(_services);
                final ledService = _services
                    .where(
                      (s) =>
                          s.serviceUuid ==
                          Guid('a0b40001-926d-4d61-98df-8c5c62ee53b3'),
                    )
                    .first
                    .characteristics
                    .where((c) =>
                        c.characteristicUuid ==
                        Guid('a0b40002-926d-4d61-98df-8c5c62ee53b3'))
                    .first;

                ledService.write([
                  0,
                  1,
                  0,
                ]);
                // await Future.delayed(Duration(seconds: 2));
                List<int> ledServiceValue = await ledService.read();
                print("READ LED SERVICE: $ledServiceValue");
              },
              child: Text('Toggle LED'),
            ),
            ElevatedButton(
              onPressed: () async {
                print('Toggle LED');
                print(_services);
                final ledService = _services
                    .where(
                      (s) =>
                          s.serviceUuid ==
                          Guid('4c534d36-4453-3354-5253-657276696365'),
                    )
                    .first
                    .characteristics
                    .where(
                      (c) =>
                          c.characteristicUuid ==
                          Guid('61636365-6c65-7261-7469-6f6e44617461'),
                    )
                    .first;

                final senseSubscription =
                    ledService.onValueReceived.listen((value) {
                  print("UPDATE: ${String.fromCharCodes(value)}");
                });

                device!.cancelWhenDisconnected(senseSubscription);

                await ledService.setNotifyValue(true);

                // await ledService.write([1, 2, 3]);
                // await Future.delayed(Duration(seconds: 2));
                // List<int> ledServiceValue = await ledService.read();
                // print("READ Sense SERVICE: $ledServiceValue");
                // print(
                //     "READ Sense SERVICE: ${String.fromCharCodes(ledServiceValue)}");
              },
              child: Text('Read Sense'),
            )
          ],
        ),
      ),
    );
  }
}