Envelope/mobile/lib/views/main/home.dart

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:http/http.dart' as http;
import 'package:flutter_dotenv/flutter_dotenv.dart';
import '/views/main/conversation_list.dart';
import '/views/main/friend_list.dart';
import '/views/main/profile.dart';
import '/utils/storage/friends.dart';
import '/utils/storage/conversations.dart';
import '/utils/storage/messages.dart';
import '/utils/storage/session_cookie.dart';
import '/models/conversations.dart';
import '/models/friends.dart';

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

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  List<Conversation> conversations = [];
  List<Friend> friends = [];

  bool isLoading = true;
  int _selectedIndex = 0;
  List<Widget> _widgetOptions = <Widget>[
    const ConversationList(conversations: []),
    const FriendList(friends: []),
    const Profile(),
  ];

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

  void updateData() async {
    await checkLogin();
    await updateFriends();
    await updateConversations();
    await updateMessageThreads();

    conversations = await getConversations();
    friends = await getFriends();

    setState(() {
      _widgetOptions = <Widget>[
        ConversationList(conversations: conversations),
        FriendList(friends: friends),
        const Profile(),
      ];
      isLoading = false;
    });
  }

  Future<void> checkLogin() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();

    var loggedInTime = preferences.getString('logged_in_at');
    if (loggedInTime == null) {
      preferences.remove('logged_in_at');
      preferences.remove('username');
      preferences.remove('userId');
      preferences.remove('asymmetricPublicKey');
      Navigator.pushNamedAndRemoveUntil(context, '/landing', ModalRoute.withName('/landing'));
      return;
    }

    DateTime loggedInAt = DateTime.parse(loggedInTime);
    bool isAfter = loggedInAt.isAfter((DateTime.now()).add(const Duration(hours: 12)));
    int statusCode = 200;

    try {
      var resp = await http.get(
          Uri.parse('${dotenv.env["SERVER_URL"]}api/v1/auth/check'),
          headers: {
            'cookie': await getSessionCookie(),
          }
      );
      statusCode = resp.statusCode;
    } catch(SocketException) {
      if (!isAfter) {
        return;
      }
    }

    if (!isAfter && statusCode == 200) {
      return;
    }

    preferences.remove('logged_in_at');
    preferences.remove('username');
    preferences.remove('userId');
    preferences.remove('asymmetricPublicKey');
    Navigator.pushNamedAndRemoveUntil(context, '/landing', ModalRoute.withName('/landing'));
  }

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  Widget loading() {
    return Stack(
        children: <Widget>[
          const Opacity(
              opacity: 0.1,
              child: ModalBarrier(dismissible: false, color: Colors.black),
          ),
          Center(
              child: Column(
                  mainAxisSize: MainAxisSize.max,
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: const <Widget> [
                    CircularProgressIndicator(),
                    SizedBox(height: 25),
                    Text("Loading..."),
                  ],
              )
          ),
        ]
    );
  }

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
        onWillPop: () async => false,
        child: Scaffold(
            body: isLoading ? loading() : _widgetOptions.elementAt(_selectedIndex),
            bottomNavigationBar: isLoading ? const SizedBox.shrink() : BottomNavigationBar(
                currentIndex: _selectedIndex,
                onTap: _onItemTapped,
                selectedItemColor: Colors.red,
                unselectedItemColor: Colors.grey.shade600,
                selectedLabelStyle: const TextStyle(fontWeight: FontWeight.w600),
                unselectedLabelStyle: const TextStyle(fontWeight: FontWeight.w600),
                type: BottomNavigationBarType.fixed,
                items: const [
                  BottomNavigationBarItem(
                      icon: Icon(Icons.message),
                      label: "Chats",
                  ),
                  BottomNavigationBarItem(
                      icon: Icon(Icons.group_work),
                      label: "Friends",
                  ),
                  BottomNavigationBarItem(
                      icon: Icon(Icons.account_box),
                      label: "Profile",
                  ),
                ],
            ),
        ),
    );
  }
}