import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'login.dart';
import 'screens/improved_home_screen.dart';
import 'services/auth_service.dart';
import 'services/server_discovery_service.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  SystemChrome.setSystemUIOverlayStyle(
    const SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      statusBarIconBrightness: Brightness.light,
    ),
  );

  // ✅ Load persisted auth session (token/user) from secure storage
  final authService = AuthService();
  await authService.loadToken();

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  static const _primary = Color(0xFF1565C0);
  static const _accent = Color(0xFF00897B);
  static const _surfaceTint = Color(0xFFF3F7FB);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Kontrak Kampus',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: _primary,
          primary: _primary,
          secondary: _accent,
          surface: Colors.white,
          brightness: Brightness.light,
        ),
        useMaterial3: true,
        scaffoldBackgroundColor: _surfaceTint,
        canvasColor: _surfaceTint,
        splashFactory: InkSparkle.splashFactory,
        textTheme: const TextTheme(
          titleLarge: TextStyle(
            fontWeight: FontWeight.w700,
            letterSpacing: 0.2,
            color: Color(0xFF1B2A41),
          ),
          titleMedium: TextStyle(
            fontWeight: FontWeight.w600,
            letterSpacing: 0.15,
            color: Color(0xFF23324D),
          ),
          bodyLarge: TextStyle(
            fontWeight: FontWeight.w500,
            color: Color(0xFF2B3A55),
          ),
          bodyMedium: TextStyle(color: Color(0xFF3B4A64)),
        ),
        appBarTheme: const AppBarTheme(
          backgroundColor: _primary,
          foregroundColor: Colors.white,
          elevation: 0,
          centerTitle: true,
          titleTextStyle: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.w600,
            color: Colors.white,
          ),
        ),
        cardTheme: CardThemeData(
          elevation: 0,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
          color: Colors.white,
          shadowColor: Colors.black.withOpacity(0.05),
          margin: const EdgeInsets.symmetric(horizontal: 0, vertical: 0),
        ),
        elevatedButtonTheme: ElevatedButtonThemeData(
          style: ElevatedButton.styleFrom(
            elevation: 0,
            backgroundColor: _primary,
            foregroundColor: Colors.white,
            padding: const EdgeInsets.symmetric(vertical: 14, horizontal: 24),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12),
            ),
            textStyle: const TextStyle(
              fontSize: 15,
              fontWeight: FontWeight.w600,
              letterSpacing: 0.3,
            ),
          ),
        ),
        outlinedButtonTheme: OutlinedButtonThemeData(
          style: OutlinedButton.styleFrom(
            foregroundColor: _primary,
            side: const BorderSide(color: Color(0xFFD2DFEF)),
            padding: const EdgeInsets.symmetric(vertical: 13, horizontal: 18),
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(12),
            ),
            textStyle: const TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.w600,
              letterSpacing: 0.2,
            ),
          ),
        ),
        textButtonTheme: TextButtonThemeData(
          style: TextButton.styleFrom(
            foregroundColor: _primary,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(10),
            ),
            textStyle: const TextStyle(
              fontWeight: FontWeight.w600,
              fontSize: 14,
            ),
          ),
        ),
        progressIndicatorTheme: const ProgressIndicatorThemeData(
          color: _primary,
          linearTrackColor: Color(0xFFE2EAF3),
        ),
        inputDecorationTheme: InputDecorationTheme(
          filled: true,
          fillColor: const Color(0xFFFAFCFF),
          contentPadding: const EdgeInsets.symmetric(
            horizontal: 16,
            vertical: 14,
          ),
          border: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: const BorderSide(color: Color(0xFFE2EAF3)),
          ),
          enabledBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: const BorderSide(color: Color(0xFFE2EAF3)),
          ),
          focusedBorder: OutlineInputBorder(
            borderRadius: BorderRadius.circular(12),
            borderSide: const BorderSide(color: _primary, width: 1.5),
          ),
          hintStyle: const TextStyle(
            color: Color(0xFF8D9BB0),
            fontWeight: FontWeight.w500,
          ),
        ),
        chipTheme: ChipThemeData(
          backgroundColor: const Color(0xFFE9F1FB),
          selectedColor: const Color(0xFF1565C0),
          secondarySelectedColor: const Color(0xFF1565C0),
          disabledColor: const Color(0xFFE2E8F0),
          labelStyle: const TextStyle(
            color: Color(0xFF34435E),
            fontWeight: FontWeight.w600,
          ),
          secondaryLabelStyle: const TextStyle(
            color: Colors.white,
            fontWeight: FontWeight.w700,
          ),
          side: const BorderSide(color: Color(0xFFD6E2F1)),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(24),
          ),
        ),
        snackBarTheme: SnackBarThemeData(
          behavior: SnackBarBehavior.floating,
          backgroundColor: const Color(0xFF1C2A44),
          contentTextStyle: const TextStyle(
            color: Colors.white,
            fontWeight: FontWeight.w500,
          ),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
        ),
        dialogTheme: DialogThemeData(
          backgroundColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(20),
          ),
        ),
        bottomSheetTheme: const BottomSheetThemeData(
          backgroundColor: Colors.white,
          modalBackgroundColor: Colors.white,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
          ),
        ),
        bottomNavigationBarTheme: const BottomNavigationBarThemeData(
          backgroundColor: Colors.white,
          selectedItemColor: _primary,
          unselectedItemColor: Color(0xFF94A0B2),
          type: BottomNavigationBarType.fixed,
          elevation: 8,
        ),
        navigationBarTheme: NavigationBarThemeData(
          backgroundColor: Colors.white,
          indicatorColor: _primary.withOpacity(0.12),
          labelTextStyle: WidgetStateProperty.resolveWith((states) {
            final selected = states.contains(WidgetState.selected);
            return TextStyle(
              fontSize: 12,
              fontWeight: selected ? FontWeight.w700 : FontWeight.w500,
              color: selected ? _primary : const Color(0xFF94A0B2),
            );
          }),
          iconTheme: WidgetStateProperty.resolveWith((states) {
            final selected = states.contains(WidgetState.selected);
            return IconThemeData(
              color: selected ? _primary : const Color(0xFF94A0B2),
              size: 24,
            );
          }),
        ),
        listTileTheme: const ListTileThemeData(
          iconColor: Color(0xFF5A6B85),
          textColor: Color(0xFF24344D),
          tileColor: Colors.transparent,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(12)),
          ),
        ),
        dividerTheme: const DividerThemeData(
          color: Color(0xFFE8EDF4),
          thickness: 1,
          space: 0,
        ),
        pageTransitionsTheme: const PageTransitionsTheme(
          builders: {
            TargetPlatform.android: FadeForwardsPageTransitionsBuilder(),
            TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
            TargetPlatform.windows: FadeUpwardsPageTransitionsBuilder(),
            TargetPlatform.macOS: FadeUpwardsPageTransitionsBuilder(),
            TargetPlatform.linux: FadeUpwardsPageTransitionsBuilder(),
          },
        ),
      ),
      home: const SplashScreen(),
      debugShowCheckedModeBanner: false,
    );
  }
}

// Splash screen dengan animasi
class SplashScreen extends StatefulWidget {
  const SplashScreen({super.key});

  @override
  State<SplashScreen> createState() => _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen>
    with SingleTickerProviderStateMixin {
  final _authService = AuthService();
  late AnimationController _animController;
  late Animation<double> _fadeAnim;
  late Animation<double> _scaleAnim;
  String _statusText = 'Memulai aplikasi...';

  @override
  void initState() {
    super.initState();
    _animController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1200),
    );
    _fadeAnim = Tween<double>(
      begin: 0,
      end: 1,
    ).animate(CurvedAnimation(parent: _animController, curve: Curves.easeOut));
    _scaleAnim = Tween<double>(begin: 0.7, end: 1).animate(
      CurvedAnimation(parent: _animController, curve: Curves.elasticOut),
    );
    _animController.forward();
    _checkAuth();
  }

  @override
  void dispose() {
    _animController.dispose();
    super.dispose();
  }

  Future<void> _checkAuth() async {
    // 🔍 Auto-detect server IP dengan fallback ke konfigurasi default.
    // Ini membantu APK tetap bisa konek saat IP LAN berubah.
    await ServerDiscoveryService.discover(
      onStatus: (status) {
        if (mounted) setState(() => _statusText = status);
      },
    ).timeout(
      const Duration(seconds: 8),
      onTimeout: () {
        debugPrint('Server discovery timeout, using configured server URL');
        return false;
      },
    );

    if (mounted) setState(() => _statusText = 'Memeriksa sesi...');
    await _authService.loadToken();
    await Future.delayed(const Duration(milliseconds: 400));

    if (!mounted) return;

    final destination = _authService.isAuthenticated
        ? const ImprovedHomeScreen()
        : const LoginScreen();

    Navigator.pushReplacement(
      context,
      PageRouteBuilder(
        pageBuilder: (_, __, ___) => destination,
        transitionsBuilder: (_, animation, __, child) {
          return FadeTransition(opacity: animation, child: child);
        },
        transitionDuration: const Duration(milliseconds: 500),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        decoration: const BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topLeft,
            end: Alignment.bottomRight,
            colors: [Color(0xFF1565C0), Color(0xFF0D47A1), Color(0xFF1A237E)],
          ),
        ),
        child: Center(
          child: FadeTransition(
            opacity: _fadeAnim,
            child: ScaleTransition(
              scale: _scaleAnim,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Container(
                    padding: const EdgeInsets.all(28),
                    decoration: BoxDecoration(
                      color: Colors.white,
                      shape: BoxShape.circle,
                      boxShadow: [
                        BoxShadow(
                          color: Colors.black.withOpacity(0.15),
                          blurRadius: 30,
                          offset: const Offset(0, 10),
                        ),
                      ],
                    ),
                    child: const Icon(
                      Icons.school_rounded,
                      size: 64,
                      color: Color(0xFF1565C0),
                    ),
                  ),
                  const SizedBox(height: 32),
                  const Text(
                    'Kontrak Kampus',
                    style: TextStyle(
                      fontSize: 30,
                      fontWeight: FontWeight.w800,
                      color: Colors.white,
                      letterSpacing: 0.5,
                    ),
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Rekomendasi Kontrakan & Laundry untuk Mahasiswa',
                    style: TextStyle(
                      fontSize: 14,
                      color: Colors.white.withOpacity(0.8),
                      letterSpacing: 0.3,
                    ),
                  ),
                  const SizedBox(height: 48),
                  SizedBox(
                    width: 32,
                    height: 32,
                    child: CircularProgressIndicator(
                      strokeWidth: 2.5,
                      valueColor: AlwaysStoppedAnimation<Color>(
                        Colors.white.withOpacity(0.9),
                      ),
                    ),
                  ),
                  const SizedBox(height: 16),
                  Text(
                    _statusText,
                    style: TextStyle(
                      fontSize: 13,
                      color: Colors.white.withOpacity(0.7),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}