import 'dart:async';

import 'package:fluent_ui/fluent_ui.dart';
import 'package:get/get.dart';
import 'package:reboot_common/common.dart';
import 'package:reboot_launcher/src/controller/backend_controller.dart';
import 'package:reboot_launcher/src/controller/game_controller.dart';
import 'package:reboot_launcher/src/controller/hosting_controller.dart';
import 'package:reboot_launcher/src/widget/snackbar/snackbar.dart';
import 'package:reboot_launcher/src/widget/section/backend/message.dart';
import 'package:reboot_launcher/src/util/translations.dart';

class BackendButton extends StatefulWidget {
  const BackendButton({Key? key}) : super(key: key);

  @override
  State<BackendButton> createState() => _BackendButtonState();
}

class _BackendButtonState extends State<BackendButton> {
  final GameController _gameController = Get.find<GameController>();
  final HostingController _hostingController = Get.find<HostingController>();
  final BackendController _backendController = Get.find<BackendController>();
  final StreamController<void> _textController = StreamController.broadcast();
  late final void Function() _listener = () => _textController.add(null);

  @override
  void initState() {
    _backendController.port.addListener(_listener);
    super.initState();
  }

  @override
  void dispose() {
    _backendController.port.removeListener(_listener);
    _textController.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) => Align(
      alignment: AlignmentDirectional.bottomCenter,
      child: SizedBox(
          height: 48,
          width: double.infinity,
          child: Button(
              child: Align(
                alignment: Alignment.center,
                child: StreamBuilder(
                    stream: _textController.stream,
                    builder: (context, snapshot) => Obx(() => Text(_text))
                ),
              ),
              onPressed: () => _backendController.toggle(
                  eventHandler: _onEvent,
                  errorHandler: _onError
              )
          )
      )
  );

  SnackBar? _onEvent(AuthBackendType type, AuthBackendEvent event) {
    _backendController.started.value = event.type.isStart && !event.type.isError;
    if(event.type == AuthBackendEventType.startedImplementation) {
      _backendController.implementation = event.implementation;
    }
    return onBackendResult(type, event);
  }

  void _onError(String error) {
    if(_backendController.started.value) {
      _backendController.stop();
      _gameController.instance.value?.kill();
      _hostingController.instance.value?.kill();
      onBackendError(error);
    }
  }
  
  String get _text {
    if(_backendController.type.value == AuthBackendType.local
        && _backendController.port.text.trim() == kDefaultBackendPort.toString()){
      return translations.checkServer;
    }else if(_backendController.started.value){
      return translations.stopServer;
    }else {
      return translations.startServer;
    }
  }
}