// GCG.MeinCantor - Die Schulplattform für Cantorianer.
// Copyright (C) 2021-2022 Georg-Cantor-Gymnasium Halle (Saale)

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:meincantor/networking.dart';
import 'package:meincantor/dashboard.dart';

Future<bool> checkKey() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  String? apiKey = prefs.getString('api_key');
  return apiKey != null && apiKey.isNotEmpty;
}

class Login extends StatelessWidget {
  Login({Key? key}) : super(key: key);

  final userController = TextEditingController();
  final passwordController = TextEditingController();
  final otpController = TextEditingController();
  final devIdController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        double widgetWidth = constraints.maxWidth;
        //double widgetHeight = constraints.maxHeight;
        int factor;

        if (widgetWidth <= 600) {
          factor = 1;
        } else if (widgetWidth <= 1400) {
          factor = 2;
        } else if (widgetWidth <= 2000) {
          factor = 3;
        } else {
          factor = 4;
        }

        return Scaffold(
            body: Center(
                child: SingleChildScrollView(
                    child: Padding(
                        padding: const EdgeInsets.fromLTRB(20, 20, 20, 20),
                        child: Container(
                          constraints: BoxConstraints(
                            maxWidth:
                                MediaQuery.of(context).size.width / factor,
                          ),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              MediaQuery.of(context).platformBrightness ==
                                      Brightness.light
                                  ? Image.asset(
                                      "assets/images/meincantor-big.png",
                                      width: 256)
                                  : Image.asset(
                                      "assets/images/meincantor-big-dark.png",
                                      width: 256),
                              const Divider(),
                              AutofillGroup(
                                  child: Column(
                                children: [
                                  TextField(
                                    autofillHints: const [
                                      AutofillHints.username
                                    ],
                                    decoration: const InputDecoration(
                                      icon: Icon(MdiIcons.identifier),
                                      border: OutlineInputBorder(),
                                      labelText: 'Benutzername',
                                    ),
                                    controller: userController,
                                  ),
                                  const Divider(),
                                  TextField(
                                    autofillHints: const [
                                      AutofillHints.password
                                    ],
                                    decoration: const InputDecoration(
                                      icon: Icon(MdiIcons.lock),
                                      border: OutlineInputBorder(),
                                      labelText: 'Passwort',
                                    ),
                                    obscureText: true,
                                    controller: passwordController,
                                  ),
                                ],
                              )),
                              const Divider(),
                              TextField(
                                decoration: const InputDecoration(
                                  icon: Icon(MdiIcons.twoFactorAuthentication),
                                  border: OutlineInputBorder(),
                                  labelText: '2F2-Code',
                                ),
                                obscureText: true,
                                controller: otpController,
                              ),
                              const Divider(),
                              OutlinedButton(
                                  onPressed: () async {
                                    SharedPreferences prefs =
                                        await SharedPreferences.getInstance();
                                    Response loginResponse = await getToken(
                                        userController.text,
                                        passwordController.text,
                                        otpController.text,
                                        devIdController.text);
                                    if (loginResponse.statusCode == 200) {
                                      String apiKey = jsonDecode(utf8.decode(
                                          loginResponse.bodyBytes))['token'];
                                      prefs.setString('api_key', apiKey);
                                      dynamic userinfo = jsonDecode(
                                          await getUserInfo(
                                              userController.text,
                                              passwordController.text,
                                              otpController.text,
                                              devIdController.text));
                                      prefs.setString('user',
                                          userinfo['preferred_username']);
                                      prefs.setString('user',
                                          userinfo['preferred_username']);
                                      prefs.setString('name', userinfo['name']);
                                      prefs.setString(
                                          'email', userinfo['email']);
                                      prefs.setString(
                                          'class_num',
                                          userinfo['groups'][0]
                                              .replaceAll("_", "/"));
                                    } else if (loginResponse.statusCode ==
                                        401) {
                                      String text = loginResponse.body;
                                      final snackBar = SnackBar(
                                          content: Text('Fehler: $text'));
                                      ScaffoldMessenger.of(context)
                                          .showSnackBar(snackBar);
                                    }
                                    if (prefs.getString('api_key') != null &&
                                        prefs
                                            .getString('api_key')!
                                            .isNotEmpty) {
                                      Future.delayed(Duration.zero, () {
                                        Navigator.pushReplacement(
                                          context,
                                          MaterialPageRoute(
                                              builder: (context) =>
                                                  const Dashboard()),
                                        );
                                      });
                                    }
                                  },
                                  child: const Text("Anmelden"))
                            ],
                          ),
                        )))));
      },
    );
  }
}