import 'dart:math' as math;

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:permission_handler/permission_handler.dart';

import 'home_screen.dart';
import '../utils/secure_messaging_service.dart';

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

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

class _SplashScreenState extends State<SplashScreen>
    with TickerProviderStateMixin {
  static const _platform =
      MethodChannel('com.example.saba_secure_sms/sms_role');
  String _statusText = "در حال بررسی مجوزها...";
  String? _startupError;

  late AnimationController _animationController;
  late AnimationController _loaderController;
  late Animation<double> _scaleAnimation;
  late Animation<double> _fadeAnimation;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1500),
    );

    _scaleAnimation = Tween<double>(begin: 0.6, end: 1.0).animate(
      CurvedAnimation(parent: _animationController, curve: Curves.elasticOut),
    );

    _fadeAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
          parent: _animationController,
          curve: const Interval(0.0, 0.5, curve: Curves.easeIn)),
    );

    _loaderController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1800),
    )..repeat();

    _animationController.forward();
    _checkPermissions();
  }

  @override
  void dispose() {
    _animationController.dispose();
    _loaderController.dispose();
    super.dispose();
  }

  Future<void> _checkPermissions() async {
    // کمی تاخیر برای اینکه انیمیشن دیده شود
    await Future.delayed(const Duration(seconds: 2));

    // ... rest of permission logic remains the same ...
    Map<Permission, PermissionStatus> statuses = await [
      Permission.sms,
      Permission.phone,
      Permission.contacts,
      Permission.notification,
    ].request();

    if (statuses[Permission.sms]!.isGranted &&
        statuses[Permission.phone]!.isGranted &&
        statuses[Permission.contacts]!.isGranted) {
      await _checkAndRequestDefaultSms();

      if (mounted) {
        setState(() {
          _statusText = "آماده‌سازی امن صبا...";
          _startupError = null;
        });
      }
      await _initializeSecureLayer();
    } else {
      if (mounted) {
        showDialog(
          context: context,
          barrierDismissible: false,
          builder: (context) => AlertDialog(
            shape:
                RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
            title: const Text("مجوزهای مورد نیاز"),
            content: const Text(
                "صبا برای پیام‌رسانی امن به دسترسی پیامک و مخاطبین نیاز دارد."),
            actions: [
              TextButton(
                onPressed: () => openAppSettings(),
                child: const Text("تنظیمات"),
              ),
              TextButton(
                onPressed: () {
                  Navigator.pop(context);
                  _checkPermissions();
                },
                child: const Text("تلاش مجدد"),
              ),
            ],
          ),
        );
      }
    }
  }

  Future<void> _initializeSecureLayer() async {
    try {
      await SecureMessagingService.instance.init();
      // تاخیر کوتاه برای نمایش حالت 'آماده'
      await Future.delayed(const Duration(milliseconds: 800));
      _goToHome();
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _startupError = e.toString();
        _statusText = "خطا در راه‌اندازی لایه امنیتی";
      });
    }
  }

  Future<void> _checkAndRequestDefaultSms() async {
    try {
      final bool isDefault = await _platform.invokeMethod('isDefaultSmsApp');
      if (!isDefault) {
        await _platform.invokeMethod('requestDefaultSmsApp');
        await Future.delayed(const Duration(seconds: 1));
      }
    } catch (_) {}
  }

  void _goToHome() {
    if (mounted) {
      Navigator.pushReplacement(
        context,
        PageRouteBuilder(
          transitionDuration: const Duration(milliseconds: 800),
          pageBuilder: (context, animation, secondaryAnimation) =>
              const HomeScreen(),
          transitionsBuilder: (context, animation, secondaryAnimation, child) {
            return FadeTransition(opacity: animation, child: child);
          },
        ),
      );
    }
  }

  Widget _buildSecurityLoader() {
    return AnimatedBuilder(
      animation: _loaderController,
      builder: (context, child) {
        final t = _loaderController.value;
        final scanProgress = Curves.easeInOut.transform(t);
        final pulses = [
          (t + 0.08) % 1.0,
          (t + 0.58) % 1.0,
        ];

        return SizedBox(
          width: 180,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              SizedBox(
                width: 120,
                height: 120,
                child: Stack(
                  alignment: Alignment.center,
                  children: [
                    for (final pulse in pulses)
                      Transform.scale(
                        scale: 0.78 + (pulse * 0.72),
                        child: Opacity(
                          opacity: (1 - pulse) * 0.22,
                          child: Container(
                            width: 88,
                            height: 88,
                            decoration: BoxDecoration(
                              shape: BoxShape.circle,
                              border: Border.all(
                                color: Colors.white,
                                width: 1.2,
                              ),
                            ),
                          ),
                        ),
                      ),
                    Container(
                      width: 92,
                      height: 92,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(28),
                        gradient: LinearGradient(
                          begin: Alignment.topLeft,
                          end: Alignment.bottomRight,
                          colors: [
                            Colors.white.withValues(alpha: 0.18),
                            Colors.white.withValues(alpha: 0.06),
                          ],
                        ),
                        border: Border.all(
                          color: Colors.white.withValues(alpha: 0.22),
                          width: 1,
                        ),
                        boxShadow: [
                          BoxShadow(
                            color:
                                const Color(0xFF8EC5FF).withValues(alpha: 0.18),
                            blurRadius: 20,
                            spreadRadius: 1,
                          ),
                        ],
                      ),
                      child: ClipRRect(
                        borderRadius: BorderRadius.circular(28),
                        child: Stack(
                          alignment: Alignment.center,
                          children: [
                            Positioned(
                              top: 10 + (scanProgress * 50),
                              child: Container(
                                width: 78,
                                height: 18,
                                decoration: BoxDecoration(
                                  borderRadius: BorderRadius.circular(18),
                                  gradient: LinearGradient(
                                    colors: [
                                      Colors.transparent,
                                      Colors.white.withValues(alpha: 0.0),
                                      const Color(0xFF7FD8FF)
                                          .withValues(alpha: 0.34),
                                      Colors.white.withValues(alpha: 0.0),
                                      Colors.transparent,
                                    ],
                                  ),
                                ),
                              ),
                            ),
                            Container(
                              width: 60,
                              height: 60,
                              decoration: BoxDecoration(
                                shape: BoxShape.circle,
                                color: Colors.white.withValues(alpha: 0.1),
                              ),
                            ),
                            const Icon(
                              Icons.verified_user_rounded,
                              color: Colors.white,
                              size: 34,
                            ),
                          ],
                        ),
                      ),
                    ),
                    Positioned(
                      bottom: 2,
                      child: Row(
                        children: List.generate(4, (index) {
                          final wave = 0.5 +
                              0.5 *
                                  math.sin(
                                    ((t + (index * 0.16)) * 2 * math.pi),
                                  );
                          final height = 10 + (wave * 18);
                          return Container(
                            width: 9,
                            height: height,
                            margin: const EdgeInsets.symmetric(horizontal: 3),
                            decoration: BoxDecoration(
                              borderRadius: BorderRadius.circular(10),
                              gradient: const LinearGradient(
                                begin: Alignment.topCenter,
                                end: Alignment.bottomCenter,
                                colors: [
                                  Colors.white,
                                  Color(0xFF7FD8FF),
                                ],
                              ),
                            ),
                          );
                        }),
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 16),
              Container(
                width: 150,
                height: 8,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(99),
                  color: Colors.white.withValues(alpha: 0.12),
                ),
                child: Stack(
                  children: [
                    AnimatedAlign(
                      duration: const Duration(milliseconds: 120),
                      alignment: Alignment(-1 + (scanProgress * 2), 0),
                      child: Container(
                        width: 52,
                        height: 8,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(99),
                          gradient: const LinearGradient(
                            colors: [
                              Color(0xFF7FD8FF),
                              Color(0xFFFFFFFF),
                            ],
                          ),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [Theme.of(context).primaryColor, const Color(0xFF1A237E)],
          ),
        ),
        child: Stack(
          children: [
            // Background subtle patterns could go here
            Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  AnimatedBuilder(
                    animation: _animationController,
                    builder: (context, child) {
                      return Opacity(
                        opacity: _fadeAnimation.value,
                        child: Transform.scale(
                          scale: _scaleAnimation.value,
                          child: Hero(
                            tag: 'app_logo',
                            child: SizedBox(
                              width: 200,
                              height: 200,
                              child: Image.asset('صبا بالا.png'),
                            ),
                          ),
                        ),
                      );
                    },
                  ),
                  const SizedBox(height: 40),
                  const Text(
                    "صبا",
                    style: TextStyle(
                      fontSize: 32,
                      fontWeight: FontWeight.bold,
                      color: Colors.white,
                      letterSpacing: 1.2,
                    ),
                  ),
                  const Text(
                    "پیام‌رسان امن و پیشرفته",
                    style: TextStyle(
                      fontSize: 16,
                      color: Colors.white70,
                      fontWeight: FontWeight.w300,
                    ),
                  ),
                  const SizedBox(height: 60),
                  if (_startupError == null) _buildSecurityLoader(),
                  if (_startupError != null)
                    ElevatedButton(
                      style: ElevatedButton.styleFrom(
                        backgroundColor: Colors.white,
                        foregroundColor: Colors.blue.shade900,
                        shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(15)),
                      ),
                      onPressed: () {
                        setState(() {
                          _startupError = null;
                          _statusText = "در حال اتصال...";
                        });
                        _checkPermissions();
                      },
                      child: const Text("تلاش مجدد"),
                    ),
                  const SizedBox(height: 20),
                  Text(
                    _statusText,
                    style: const TextStyle(color: Colors.white60, fontSize: 13),
                  ),
                ],
              ),
            ),
            const Positioned(
              bottom: 40,
              left: 0,
              right: 0,
              child: Center(
                child: Text(
                  "SABA SECURE MESSENGER",
                  style: TextStyle(
                    color: Colors.white24,
                    fontSize: 12,
                    letterSpacing: 2,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}