lunasea/lib/main.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:lunasea/core.dart';

/// LunaSea Entry Point: Initialize & Run Application
/// 
/// Runs app in guarded zone to attempt to capture fatal (crashing) errors
Future<void> main() async {
    WidgetsFlutterBinding.ensureInitialized();
    await _init();
    runZonedGuarded(
        () => runApp(
            EasyLocalization(
                supportedLocales: LunaLocalization().supportedLocales,
                path: LunaLocalization().fileDirectory,
                fallbackLocale: LunaLocalization().fallbackLocale,
                useFallbackTranslations: true,
                child: LunaBIOS(),
            ),
        ),
        (error, stack) => LunaLogger().critical(error, stack),
    );
}

/// Initializes LunaSea before running the BIOS Widget.
/// 
/// Sets up (in order):
/// - System UI Overlay Styling
/// - Logger
/// - Network
/// - Image Cache
/// - Router
/// - Firebase
/// - IAPs
/// - Database
/// 
/// Does not call [WidgetsFlutterBinding.ensureInitialized()] as that is called during Sentry's initialization.
/// If Sentry is removed, you should call that method to prevent black-screen flashing on launch.
Future<void> _init() async {
    //Set system UI overlay style (navbar, statusbar)
    SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
        systemNavigationBarColor: Colors.black,
        systemNavigationBarDividerColor: Colors.black,
        statusBarColor: Colors.transparent,
    ));
    //LunaSea initialization
    await Database().initialize();
    await LunaFirebase().initialize();
    LunaLogger().initialize();
    LunaNetworking().initialize();
    LunaImageCache().initialize();
    LunaRouter().intialize();
    await LunaInAppPurchases().initialize();
    await LunaLocalization().initialize();
}

class LunaBIOS extends StatefulWidget {
    @override
    State<StatefulWidget> createState() => _State();
}

class _State extends State<LunaBIOS> {
    StreamSubscription _firebaseOnMessageListener;
    StreamSubscription _firebaseOnMessageOpenedAppListener;

    @override
    void initState() {
        super.initState();
        SchedulerBinding.instance.addPostFrameCallback((_) => _boot());
    }

    @override
    void dispose() {
        Future.wait([
            if(_firebaseOnMessageListener != null) _firebaseOnMessageListener.cancel(),
            if(_firebaseOnMessageOpenedAppListener != null) _firebaseOnMessageOpenedAppListener.cancel(),
            Database().deinitialize(),
            LunaInAppPurchases().deinitialize(),
        ]).then((_) => super.dispose());
    }

    /// Runs the first-step boot sequence that is required for widgets
    Future<void> _boot() async {
        // Initialize notifications
        // - Request notification permission
        // - Add device token to Firebase (if logged in)
        // - Check and handle initial message (if found)
        // - Add notification listeners for onMessage and onMessageOpenedApp
        await LunaFirebaseMessaging().requestNotificationPermissions();
        LunaFirebaseFirestore().addDeviceToken();
        LunaFirebaseMessaging().checkAndHandleInitialMessage();
        _firebaseOnMessageListener = LunaFirebaseMessaging().onMessageListener();
        _firebaseOnMessageOpenedAppListener = LunaFirebaseMessaging().onMessageOpenedAppListener();
        // Remaining boot sequence
        LunaQuickActions().initialize();
        LunaChangelog().checkAndShowChangelog();
        LunaFirebaseAnalytics().appOpened();
    }

    @override
    Widget build(BuildContext context) => LunaState.providers(
        child: ValueListenableBuilder(
            valueListenable: Database.lunaSeaBox.listenable(keys: [
                LunaDatabaseValue.THEME_AMOLED.key,
                LunaDatabaseValue.THEME_AMOLED_BORDER.key,
            ]),
            builder: (context, box, _) {
                return MaterialApp(
                    localizationsDelegates: context.localizationDelegates,
                    supportedLocales: context.supportedLocales,
                    locale: context.locale,
                    routes: LunaRouter().routes,
                    onGenerateRoute: LunaRouter.router.generator,
                    navigatorKey: LunaState.navigatorKey,
                    navigatorObservers: [LunaFirebaseAnalytics.observer],
                    darkTheme: LunaTheme().activeTheme(),
                    theme: LunaTheme().activeTheme(),
                    title: 'LunaSea',
                );
            },
        ),
    );
}