powerage-ristoris-flutter/lib/main.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:permission_handler/permission_handler.dart';
import 'database/database.dart';
import 'app.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  if (Platform.isAndroid) {
    var status = await Permission.manageExternalStorage.status;
    if (!status.isGranted) {
      await Permission.manageExternalStorage.request();

      for (var i = 0; i < 30; i++) {
        await Future.delayed(const Duration(seconds: 1));
        status = await Permission.manageExternalStorage.status;
        if (status.isGranted) break;
      }

      if (!status.isGranted) {
        runApp(
          const ProviderScope(child: _PermissionDeniedApp()),
        );
        return;
      }
    }
  }

  await AppDatabase.ensureDatabaseReady();

  runApp(
    const ProviderScope(child: RistorisApp()),
  );
}

class _PermissionDeniedApp extends StatelessWidget {
  const _PermissionDeniedApp();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(32),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                const Icon(
                  Icons.folder_off,
                  size: 64,
                  color: Colors.red,
                ),
                const SizedBox(height: 24),
                const Text(
                  'Permesso di accesso ai file non concesso',
                  textAlign: TextAlign.center,
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                ),
                const SizedBox(height: 12),
                const Text(
                  'L\'app ha bisogno di accedere alla memoria del dispositivo per salvare il database.',
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 24),
                FilledButton.icon(
                  onPressed: () => openAppSettings(),
                  icon: const Icon(Icons.settings),
                  label: const Text('Apri Impostazioni'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}