import 'dart:math';

import 'package:famedlysdk/famedlysdk.dart';
import 'package:fluffychat/components/matrix.dart';
import 'package:fluffychat/i18n/i18n.dart';
import 'package:fluffychat/utils/app_route.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

import 'chat_list.dart';

class Login extends StatefulWidget {
  @override
  _LoginState createState() => _LoginState();
}

class _LoginState extends State<Login> {
  final TextEditingController usernameController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();
  final TextEditingController serverController =
      TextEditingController(text: "tchncs.de");
  String usernameError;
  String passwordError;
  String serverError;
  bool loading = false;
  bool showPassword = false;

  void login(BuildContext context) async {
    MatrixState matrix = Matrix.of(context);
    if (usernameController.text.isEmpty) {
      setState(() => usernameError = I18n.of(context).pleaseEnterYourUsername);
    } else {
      setState(() => usernameError = null);
    }
    if (passwordController.text.isEmpty) {
      setState(() => passwordError = I18n.of(context).pleaseEnterYourPassword);
    } else {
      setState(() => passwordError = null);
    }
    serverError = null;

    if (usernameController.text.isEmpty || passwordController.text.isEmpty) {
      return;
    }

    String homeserver = serverController.text;
    if (homeserver.isEmpty) homeserver = "tchncs.de";
    if (!homeserver.startsWith("https://")) {
      homeserver = "https://" + homeserver;
    }

    try {
      setState(() => loading = true);
      if (!await matrix.client.checkServer(homeserver)) {
        setState(
            () => serverError = I18n.of(context).homeserverIsNotCompatible);

        return setState(() => loading = false);
      }
    } catch (exception) {
      setState(() => serverError = I18n.of(context).connectionAttemptFailed);
      return setState(() => loading = false);
    }
    try {
      await matrix.client.login(
          usernameController.text, passwordController.text,
          initialDeviceDisplayName: matrix.widget.clientName);
    } on MatrixException catch (exception) {
      setState(() => passwordError = exception.errorMessage);
      return setState(() => loading = false);
    } catch (exception) {
      setState(() => passwordError = exception.toString());
      return setState(() => loading = false);
    }
    if (!kIsWeb) {
      try {
        await matrix.setupFirebase();
      } catch (exception) {
        await matrix.client.logout();
        matrix.clean();
        setState(() => passwordError = exception.toString());
        return setState(() => loading = false);
      }
    }
    setState(() => loading = false);
    await Navigator.of(context).pushAndRemoveUntil(
        AppRoute.defaultRoute(context, ChatListView()), (r) => false);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: loading ? Container() : null,
        title: TextField(
          autocorrect: false,
          controller: serverController,
          decoration: InputDecoration(
              icon: Icon(Icons.domain),
              hintText: "matrix-client.matrix.org",
              errorText: serverError,
              errorMaxLines: 1,
              prefixText: "https://",
              labelText: serverError == null ? "Homeserver" : serverError),
        ),
      ),
      body: Builder(builder: (context) {
        return ListView(
          padding: EdgeInsets.symmetric(
              horizontal:
                  max((MediaQuery.of(context).size.width - 600) / 2, 0)),
          children: <Widget>[
            Container(
              height: 150,
              color: Theme.of(context).secondaryHeaderColor,
              child: Center(
                child: Icon(
                  Icons.vpn_key,
                  size: 60,
                ),
              ),
            ),
            ListTile(
              leading: CircleAvatar(
                child: Icon(Icons.account_box,
                    color: Theme.of(context).primaryColor),
              ),
              title: TextField(
                readOnly: loading,
                autocorrect: false,
                controller: usernameController,
                decoration: InputDecoration(
                    hintText:
                        "@${I18n.of(context).username.toLowerCase()}:domain",
                    errorText: usernameError,
                    labelText: I18n.of(context).username),
              ),
            ),
            ListTile(
              leading: CircleAvatar(
                backgroundColor: Theme.of(context).brightness == Brightness.dark
                    ? Color(0xff121212)
                    : Colors.white,
                child: Icon(Icons.lock, color: Theme.of(context).primaryColor),
              ),
              title: TextField(
                readOnly: loading,
                autocorrect: false,
                controller: passwordController,
                obscureText: !showPassword,
                onSubmitted: (t) => login(context),
                decoration: InputDecoration(
                    hintText: "****",
                    errorText: passwordError,
                    suffixIcon: IconButton(
                      icon: Icon(showPassword
                          ? Icons.visibility_off
                          : Icons.visibility),
                      onPressed: () =>
                          setState(() => showPassword = !showPassword),
                    ),
                    labelText: I18n.of(context).password),
              ),
            ),
            SizedBox(height: 20),
            Container(
              height: 50,
              padding: EdgeInsets.symmetric(horizontal: 12),
              child: RaisedButton(
                elevation: 7,
                color: Theme.of(context).primaryColor,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(6),
                ),
                child: loading
                    ? CircularProgressIndicator()
                    : Text(
                        I18n.of(context).login.toUpperCase(),
                        style: TextStyle(color: Colors.white, fontSize: 16),
                      ),
                onPressed: () => loading ? null : login(context),
              ),
            ),
          ],
        );
      }),
    );
  }
}