import 'dart:async';

import 'package:badge/first_where_ext.dart';
import 'package:flutter/material.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';
import 'package:logger/logger.dart';

var logger = Logger(printer: PrettyPrinter());

class DeviceDetailsScreen extends StatefulWidget {
  final BluetoothDevice btDevice;

  const DeviceDetailsScreen({super.key, required this.btDevice});

  @override
  State<StatefulWidget> createState() {
    return DeviceDetailsState();
  }
}

class DeviceDetailsState extends State<DeviceDetailsScreen> {
  String connectStatus = "<Status>";
  // Just to have a resonable default subscription?
  StreamSubscription<BluetoothConnectionState> subs =
      Stream<BluetoothConnectionState>.empty().listen((e) => ());

  /// Whether the back button should be active.
  bool backActive = false;

  BluetoothCharacteristic? current;

  BluetoothCharacteristic? available;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text("Device details"),
      ),
      body: Center(
        child: Column(
          spacing: 20,
          children: [
            Text(connectStatus),
            ElevatedButton(
              onPressed: backActive ? backClick : null,
              child: Text("Back"),
            ),
          ],
        ),
      ),
    );
  }

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

  void backClick() {
    Navigator.pop(context);
  }

  void onConnStateChange(BluetoothConnectionState event) {
    setState(() {
      connectStatus = event.toString();
    });
    logger.i("New conn state: ${event.toString()}");
  }

  @override
  void deactivate() {
    super.deactivate();
    logger.i("Closing state");
    subs.cancel().ignore();
    widget.btDevice.disconnect().ignore();
  }

  void _doConnect() async {
    final dev = widget.btDevice;
    subs.cancel().ignore();
    subs = dev.connectionState.listen(onConnStateChange);
    try {
      logger.i("Try to connect...");
      // connect timeout doesn't work under Linux
      await dev.connect().timeout(Duration(seconds: 2));
      logger.i("Connected!");

      connectStatus = "Connected";

      // ???? WTF ????
      List<BluetoothService> svcs = await dev.discoverServices();
      dev.onServicesReset.listen((_) async {
        logger.i("Services Reset");
        try {
          List<BluetoothService> svcs = await dev.discoverServices();
          findCharac(svcs);
        } catch (e) {
          logger.e(e);
        }
      });

      logger.i("services discovered");

      findCharac(svcs);
    } catch (e) {
      logger.e(e);
      dev.disconnect().ignore();
      connectStatus = e.toString();
    } finally {
      backActive = true;
      if (mounted) {
        setState(() {});
      }
    }
  }

  void findCharac(List<BluetoothService> svcs) {
    if (svcs.isEmpty) {
      connectStatus += ", No services found!";
      return;
    }
    connectStatus += ", Services found!";
    BluetoothService? badgeService = svcs.firstWhereOrNull(
      (s) => s.serviceUuid.str == "ca260000-b4bb-46b2-bd06-b7b7a61ea990",
    );

    if (badgeService == null) {
    } else {
      logger.i("badge service found");
      current = badgeService.characteristics.firstWhereOrNull(
        (c) =>
            c.characteristicUuid.str == "ca260001-b4bb-46b2-bd06-b7b7a61ea990",
      );
      available = badgeService.characteristics.firstWhereOrNull(
        (c) =>
            c.characteristicUuid.str == "ca260002-b4bb-46b2-bd06-b7b7a61ea990",
      );
    }

    if (current == null || available == null) {
    } else {
      logger.i("characteristics found");
    }
  }
}