Fladder/lib/screens/login/lock_screen.dart

import 'package:ficonsax/ficonsax.dart';
import 'package:fladder/util/localization_helper.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import 'package:fladder/models/account_model.dart';
import 'package:fladder/providers/user_provider.dart';
import 'package:fladder/routes/build_routes/route_builder.dart';
import 'package:fladder/screens/login/widgets/login_icon.dart';
import 'package:fladder/screens/shared/fladder_snackbar.dart';
import 'package:fladder/screens/shared/passcode_input.dart';
import 'package:fladder/util/auth_service.dart';

final lockScreenActiveProvider = StateProvider<bool>((ref) => false);

class LockScreen extends ConsumerStatefulWidget {
  final bool selfLock;
  const LockScreen({this.selfLock = false, super.key});

  @override
  ConsumerState<ConsumerStatefulWidget> createState() => _LockScreenState();
}

class _LockScreenState extends ConsumerState<LockScreen> with WidgetsBindingObserver {
  bool poppingLockScreen = false;

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) async {
    switch (state) {
      case AppLifecycleState.resumed:
        hackyFixForBlackNavbar();
      default:
        break;
    }
  }

  void hackyFixForBlackNavbar() {
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge, overlays: []);
    SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      systemNavigationBarColor: Colors.transparent,
      systemNavigationBarDividerColor: Colors.transparent,
    ));
  }

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    Future.microtask(() {
      ref.read(lockScreenActiveProvider.notifier).update((state) => true);
      final user = ref.read(userProvider);
      if (user != null && !widget.selfLock) {
        tapLoggedInAccount(user);
      }
    });
    hackyFixForBlackNavbar();
  }

  void handleLogin(AccountModel user) {
    ref.read(lockScreenActiveProvider.notifier).update((state) => false);
    poppingLockScreen = true;
    context.pop();
  }

  void tapLoggedInAccount(AccountModel user) async {
    switch (user.authMethod) {
      case Authentication.autoLogin:
        handleLogin(user);
        break;
      case Authentication.biometrics:
        final authenticated = await AuthService.authenticateUser(context, user);
        if (authenticated && context.mounted) {
          handleLogin(user);
        }
        break;
      case Authentication.passcode:
        if (context.mounted) {
          showPassCodeDialog(context, (newPin) {
            if (newPin == user.localPin) {
              handleLogin(user);
            } else {
              fladderSnackbar(context, title: context.localized.incorrectPinTryAgain);
            }
          });
        }
        break;
      case Authentication.none:
        handleLogin(user);
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    final user = ref.watch(userProvider);
    return PopScope(
      canPop: false,
      onPopInvoked: (didPop) {
        if (!poppingLockScreen) {
          SystemNavigator.pop();
        }
      },
      child: Scaffold(
        body: Center(
          child: Wrap(
            crossAxisAlignment: WrapCrossAlignment.center,
            alignment: WrapAlignment.center,
            runAlignment: WrapAlignment.center,
            children: [
              const Icon(
                IconsaxOutline.lock_1,
                size: 38,
              ),
              ConstrainedBox(
                constraints: const BoxConstraints(
                  maxHeight: 400,
                  maxWidth: 400,
                ),
                child: Padding(
                  padding: const EdgeInsets.all(64.0),
                  child: LoginIcon(
                    user: user!,
                    onPressed: () => tapLoggedInAccount(user),
                  ),
                ),
              ),
              ElevatedButton.icon(
                onPressed: () {
                  ref.read(lockScreenActiveProvider.notifier).update((state) => false);
                  context.routeGo(LoginRoute());
                },
                icon: const Icon(Icons.login_rounded),
                label: Text(context.localized.login),
              ),
            ],
          ),
        ),
      ),
    );
  }
}