import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/constants/app_constants.dart';
import '../core/router/app_router.dart';
import '../core/theme/app_colors.dart';
import '../core/theme/app_theme.dart';
import '../presentation/auth/providers/auth_controller.dart';
import '../presentation/sync/providers/sync_controller.dart';

class NearlePosApp extends ConsumerWidget {
  const NearlePosApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    // Watched, not awaited: the till opens immediately and the queue drains
    // behind it. Nothing on screen depends on this having finished.
    ref.watch(syncBootstrapProvider);

    // This one *is* awaited. Re-opening a stored session is a keystore read —
    // a few milliseconds — and building the router before it lands would show
    // an already-signed-in terminal the login screen and then snatch it away.
    final restored = ref.watch(sessionBootstrapProvider);

    if (restored.isLoading) {
      return const MaterialApp(
        debugShowCheckedModeBanner: false,
        home: ColoredBox(color: AppColors.background),
      );
    }

    return MaterialApp.router(
      title: AppConstants.appName,
      debugShowCheckedModeBanner: false,
      theme: AppTheme.light,
      routerConfig: ref.watch(routerProvider),
      builder: (context, child) {
        // A POS runs on fixed hardware; ignore OS font scaling so the dense
        // billing panel can never overflow.
        return MediaQuery.withNoTextScaling(
          child: child ?? const SizedBox.shrink(),
        );
      },
    );
  }
}