import 'dart:async';

import 'package:flutter/material.dart';

import 'package:matrix/matrix.dart';
import 'package:vrouter/vrouter.dart';

import 'package:fluffychat/config/app_config.dart';
import 'package:fluffychat/pages/homeserver_picker/homeserver_picker_view.dart';
import 'package:fluffychat/widgets/matrix.dart';
import '../../utils/localized_exception_extension.dart';

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

  @override
  HomeserverPickerController createState() => HomeserverPickerController();
}

class HomeserverPickerController extends State<HomeserverPicker> {
  bool isLoading = false;
  final TextEditingController homeserverController =
      TextEditingController(text: AppConfig.defaultHomeserver);
  String? error;

  /// Starts an analysis of the given homeserver. It uses the current domain and
  /// makes sure that it is prefixed with https. Then it searches for the
  /// well-known information and forwards to the login page depending on the
  /// login type.
  Future<void> checkHomeserverAction() async {
    setState(() {
      error = null;
      isLoading = true;
    });

    try {
      homeserverController.text =
          homeserverController.text.trim().toLowerCase().replaceAll(' ', '-');
      var homeserver = Uri.parse(homeserverController.text);
      if (homeserver.scheme.isEmpty) {
        homeserver = Uri.https(homeserverController.text, '');
      }
      final matrix = Matrix.of(context);
      matrix.loginHomeserverSummary =
          await matrix.getLoginClient().checkHomeserver(homeserver);
      final ssoSupported = matrix.loginHomeserverSummary!.loginFlows
          .any((flow) => flow.type == 'm.login.sso');

      try {
        await Matrix.of(context).getLoginClient().register();
        matrix.loginRegistrationSupported = true;
      } on MatrixException catch (e) {
        matrix.loginRegistrationSupported = e.requireAdditionalAuthentication;
      }

      if (!ssoSupported && matrix.loginRegistrationSupported == false) {
        // Server does not support SSO or registration. We can skip to login page:
        VRouter.of(context).to('login');
      } else {
        VRouter.of(context).to('connect');
      }
    } catch (e) {
      setState(() => error = (e).toLocalizedString(context));
    } finally {
      if (mounted) {
        setState(() => isLoading = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    Matrix.of(context).navigatorContext = context;
    return HomeserverPickerView(this);
  }
}