import 'package:flutter/material.dart';
import 'package:window_manager/window_manager.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'src/database/database.dart';
import 'src/screens/dashboard_screen.dart';
import 'src/theme.dart';

late AppDatabase db;

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  db = AppDatabase();

  await windowManager.ensureInitialized();

  // Restore saved window geometry or center with default size
  final prefs = await SharedPreferences.getInstance();
  final savedX = prefs.getDouble('window_x');
  final savedY = prefs.getDouble('window_y');
  final savedW = prefs.getDouble('window_w');
  final savedH = prefs.getDouble('window_h');

  const defaultSize = Size(1280, 800);
  const minSize = Size(900, 600);

  final options = WindowOptions(
    size: savedW != null && savedH != null ? Size(savedW, savedH) : defaultSize,
    minimumSize: minSize,
    center: savedX == null, // center only on first launch
    title: 'own-ledger',
    titleBarStyle: TitleBarStyle.normal,
  );

  await windowManager.waitUntilReadyToShow(options, () async {
    if (savedX != null && savedY != null) {
      await windowManager.setPosition(Offset(savedX, savedY));
    }
    await windowManager.show();
    await windowManager.focus();
  });

  runApp(const OwnLedgerApp());
}

class OwnLedgerApp extends StatefulWidget {
  const OwnLedgerApp({super.key});

  @override
  State<OwnLedgerApp> createState() => _OwnLedgerAppState();
}

class _OwnLedgerAppState extends State<OwnLedgerApp> with WindowListener {
  @override
  void initState() {
    super.initState();
    windowManager.addListener(this);
  }

  @override
  void dispose() {
    windowManager.removeListener(this);
    super.dispose();
  }

  Future<void> _saveWindowGeometry() async {
    final prefs = await SharedPreferences.getInstance();
    final pos = await windowManager.getPosition();
    final size = await windowManager.getSize();
    await prefs.setDouble('window_x', pos.dx);
    await prefs.setDouble('window_y', pos.dy);
    await prefs.setDouble('window_w', size.width);
    await prefs.setDouble('window_h', size.height);
  }

  @override
  void onWindowMoved() => _saveWindowGeometry();

  @override
  void onWindowResized() => _saveWindowGeometry();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'own-ledger',
      debugShowCheckedModeBanner: false,
      theme: buildAppTheme(),
      home: const DashboardScreen(),
    );
  }
}