import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:mobile_number/mobile_number.dart';
import 'dart:math' as math;
import '../theme.dart';
import '../route_transitions.dart';
import '../feedback_helper.dart';
import 'mobile_login_screen.dart';

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

  @override
  State<WelcomeScreen> createState() => _WelcomeScreenState();
}

class _WelcomeScreenState extends State<WelcomeScreen> with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _splashScaleAnimation;
  late Animation<double> _splashLogoOpacityAnimation;
  late Animation<double> _splashContainerOpacityAnimation;
  late Animation<double> _contentFadeAnimation;
  late Animation<Offset> _contentSlideAnimation;

  String? _detectedMobileNumber;

  @override
  void initState() {
    super.initState();
    _initMobileNumberDetection();
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1400),
    );

    // 1. Splash Logo Zoom/Scale-down (from 3.0 to 1.0)
    _splashScaleAnimation = Tween<double>(begin: 3.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.0, 0.45, curve: Curves.easeOutBack),
      ),
    );

    // 2. Splash Logo Fade-in as it scales down
    _splashLogoOpacityAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.0, 0.35, curve: Curves.easeIn),
      ),
    );

    // 3. Splash Container Fade-out
    _splashContainerOpacityAnimation = Tween<double>(begin: 1.0, end: 0.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.45, 0.6, curve: Curves.easeOut),
      ),
    );

    // 4. Welcome Content Fade-in
    _contentFadeAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.55, 1.0, curve: Curves.easeIn),
      ),
    );

    // 5. Welcome Content Slide-up
    _contentSlideAnimation = Tween<Offset>(
      begin: const Offset(0.0, 0.05),
      end: Offset.zero,
    ).animate(
      CurvedAnimation(
        parent: _controller,
        curve: const Interval(0.55, 1.0, curve: Curves.easeOutCubic),
      ),
    );

    _controller.forward();
    Future.delayed(const Duration(milliseconds: 300), () {
      if (mounted) {
        AppFeedback.success();
      }
    });
  }

  Future<void> _initMobileNumberDetection() async {
    try {
      if (!kIsWeb && defaultTargetPlatform == TargetPlatform.android) {
        if (await MobileNumber.hasPhonePermission) {
          final String? mobileNumber = await MobileNumber.mobileNumber;
          if (mobileNumber != null && mobileNumber.isNotEmpty) {
             // Extract 10 digits if possible, else just use the number
             final cleaned = mobileNumber.replaceAll(RegExp(r'\D'), '');
             if (cleaned.length >= 10) {
               _detectedMobileNumber = cleaned.substring(cleaned.length - 10);
             } else {
               _detectedMobileNumber = mobileNumber;
             }
             return;
          }
        }
      }
    } catch (e) {
      debugPrint('Error getting mobile number: $e');
    }
    // Fallback to mock number
    _detectedMobileNumber = '9988776655';
  }

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

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final isMobile = context.isMobile;

    return Scaffold(
      body: AnimatedBuilder(
        animation: _controller,
        builder: (context, child) {
          final showSplash = _controller.value < 0.6;

          return Stack(
            children: [
              // Main Welcome Content
              Opacity(
                opacity: _contentFadeAnimation.value,
                child: SlideTransition(
                  position: _contentSlideAnimation,
                  child: IgnorePointer(
                    ignoring: showSplash,
                    child: child,
                  ),
                ),
              ),

              // Splash Overlay (Centered Logo scaling down)
              if (showSplash)
                Opacity(
                  opacity: _splashContainerOpacityAnimation.value,
                  child: Container(
                    color: Colors.white,
                    alignment: Alignment.center,
                    child: ScaleTransition(
                      scale: _splashScaleAnimation,
                      child: Opacity(
                        opacity: _splashLogoOpacityAnimation.value,
                        child: Container(
                          width: 140,
                          height: 140,
                          decoration: BoxDecoration(
                            borderRadius: BorderRadius.circular(32),
                            boxShadow: [
                              BoxShadow(
                                color: Colors.black.withOpacity(0.08),
                                blurRadius: 24,
                                offset: const Offset(0, 8),
                              )
                            ],
                          ),
                          child: ClipRRect(
                            borderRadius: BorderRadius.circular(32),
                            child: Image.asset(
                              'assets/logo/pozo_logo.jpg',
                              fit: BoxFit.cover,
                            ),
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
            ],
          );
        },
        child: SafeArea(
          child: Column(
            children: [
              // Top Progress bar indicator - 1st segment active + Quick Feedback Settings
              Padding(
                padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
                child: Row(
                  children: [
                    Expanded(
                      child: Row(
                        children: List.generate(5, (index) {
                          return Expanded(
                            child: AnimatedContainer(
                              duration: const Duration(milliseconds: 350),
                              height: 4,
                              margin: const EdgeInsets.symmetric(horizontal: 2.0),
                              decoration: BoxDecoration(
                                color: index == 0 ? theme.colorScheme.primary : theme.colorScheme.surfaceContainerHighest,
                                borderRadius: BorderRadius.circular(2),
                              ),
                            ),
                          );
                        }),
                      ),
                    ),
                    const SizedBox(width: 12),
                    _buildSettingsButton(theme),
                  ],
                ),
              ),

              // Scrollable / Responsive Content
              Expanded(
                child: LayoutBuilder(
                  builder: (context, constraints) {
                    final maxWidth = constraints.maxWidth;
                    if (maxWidth >= 768) {
                      // Desktop / Tablet Double-Column Layout
                      return SingleChildScrollView(
                        physics: const BouncingScrollPhysics(),
                        child: Center(
                          child: ConstrainedBox(
                            constraints: const BoxConstraints(maxWidth: 1000),
                            child: Padding(
                              padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 16.0),
                              child: Row(
                                crossAxisAlignment: CrossAxisAlignment.center,
                                children: [
                                  // Left column: content + button
                                  Expanded(
                                    flex: 5,
                                    child: Column(
                                      crossAxisAlignment: CrossAxisAlignment.start,
                                      children: [
                                        _buildLogo(theme),
                                        const SizedBox(height: 16),
                                        Text(
                                          'Manage your business billing in 3 clicks!',
                                          style: theme.textTheme.headlineLarge?.copyWith(
                                            fontWeight: FontWeight.bold,
                                          ),
                                        ),
                                        const SizedBox(height: 16),
                                        Text(
                                          'The fastest, most reliable tool for Indian MSMEs to run their shop.',
                                          style: theme.textTheme.bodyMedium?.copyWith(
                                            color: theme.colorScheme.onSurfaceVariant,
                                          ),
                                        ),
                                        const SizedBox(height: 16),
                                        _buildSeal(theme),
                                        const SizedBox(height: 16),
                                        _buildCTAColumn(context, theme),
                                      ],
                                    ),
                                  ),
                                  const SizedBox(width: 32),
                                  // Right column: mock card
                                  Expanded(
                                    flex: 4,
                                    child: Center(
                                      child: _buildMockDashboard(theme),
                                    ),
                                  ),
                                ],
                              ),
                            ),
                          ),
                        ),
                      );
                    } else {
                      // Mobile Single Column Layout
                      return SingleChildScrollView(
                        physics: const BouncingScrollPhysics(),
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 16.0),
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              const SizedBox(height: 16),
                              _buildLogo(theme),
                              const SizedBox(height: 16),
                              Text(
                                'Manage your business billing in 3 clicks!',
                                textAlign: TextAlign.left,
                                style: theme.textTheme.headlineLarge?.copyWith(
                                  fontWeight: FontWeight.bold,
                                ),
                              ),
                              const SizedBox(height: 16),
                              Text(
                                'The fastest, most reliable tool for Indian MSMEs to run their shop.',
                                textAlign: TextAlign.left,
                                style: theme.textTheme.bodyMedium?.copyWith(
                                  color: theme.colorScheme.onSurfaceVariant,
                                ),
                              ),
                              const SizedBox(height: 16),
                              _buildSeal(theme),
                              const SizedBox(height: 24),
                              Center(child: _buildMockDashboard(theme)),
                              const SizedBox(height: 24),
                            ],
                          ),
                        ),
                      );
                    }
                  },
                ),
              ),

              // Pinned Bottom Button on Mobile
              if (isMobile)
                Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 16.0),
                  child: _buildCTAColumn(context, theme),
                ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildLogo(ThemeData theme) {
    return Container(
      width: 80,
      height: 80,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(20),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.12),
            blurRadius: 20,
            offset: const Offset(0, 6),
          )
        ],
      ),
      child: ClipRRect(
        borderRadius: BorderRadius.circular(20),
        child: Image.asset(
          'assets/logo/pozo_logo.jpg',
          fit: BoxFit.cover,
        ),
      ),
    );
  }

  Widget _buildSeal(ThemeData theme) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
      decoration: BoxDecoration(
        color: theme.colorScheme.surfaceContainerLow,
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: theme.colorScheme.outlineVariant),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(
            Icons.verified,
            size: 16,
            color: theme.colorScheme.tertiary,
          ),
          const SizedBox(width: 6),
          Text(
            'Trusted by 10,000+ merchants',
            style: theme.textTheme.bodySmall?.copyWith(
              fontWeight: FontWeight.w600,
              color: theme.colorScheme.onSurfaceVariant,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMockDashboard(ThemeData theme) {
    return const Center(
      child: RetailUniverseVisual(),
    );
  }

  Widget _buildCTAColumn(BuildContext context, ThemeData theme) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: context.isMobile ? CrossAxisAlignment.center : CrossAxisAlignment.start,
      children: [
        InteractiveScale(
          child: ElevatedButton(
            onPressed: () {
              AppFeedback.click();
              Navigator.push(
                context,
                FadeSlidePageRoute(child: MobileLoginScreen(autoFilledMobileNumber: _detectedMobileNumber)),
              );
            },
            style: ElevatedButton.styleFrom(
              minimumSize: const Size(260, 54),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: const [
                Text('Get Started'),
                SizedBox(width: 8),
                Icon(Icons.arrow_forward, size: 18),
              ],
            ),
          ),
        ),
        const SizedBox(height: 16),
        Row(
          mainAxisAlignment: context.isMobile ? MainAxisAlignment.center : MainAxisAlignment.start,
          children: [
            Container(
              width: 10,
              height: 10,
              decoration: BoxDecoration(
                color: theme.colorScheme.primary,
                shape: BoxShape.circle,
              ),
            ),
            const SizedBox(width: 6),
            Container(
              width: 8,
              height: 8,
              decoration: BoxDecoration(
                color: Colors.grey[300],
                shape: BoxShape.circle,
              ),
            ),
            const SizedBox(width: 6),
            Container(
              width: 8,
              height: 8,
              decoration: BoxDecoration(
                color: Colors.grey[300],
                shape: BoxShape.circle,
              ),
            ),
          ],
        )
      ],
    );
  }

  Widget _buildSettingsButton(ThemeData theme) {
    final hasSound = AppFeedback.isSoundEnabled;
    final hasHaptic = AppFeedback.isHapticEnabled;

    return Material(
      color: Colors.transparent,
      child: InkWell(
        onTap: () => _showFeedbackSettings(theme),
        borderRadius: BorderRadius.circular(20),
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
          decoration: BoxDecoration(
            color: theme.colorScheme.surfaceContainerLow,
            borderRadius: BorderRadius.circular(20),
            border: Border.all(color: theme.colorScheme.outlineVariant),
          ),
          child: Row(
            mainAxisSize: MainAxisSize.min,
            children: [
              Icon(
                hasSound ? Icons.volume_up_rounded : Icons.volume_off_rounded,
                size: 16,
                color: theme.colorScheme.primary,
              ),
              const SizedBox(width: 6),
              Icon(
                hasHaptic ? Icons.vibration_rounded : Icons.phone_android_rounded,
                size: 16,
                color: theme.colorScheme.primary,
              ),
            ],
          ),
        ),
      ),
    );
  }

  void _showFeedbackSettings(ThemeData theme) {
    AppFeedback.click();
    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.white,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
      ),
      builder: (context) {
        return StatefulBuilder(
          builder: (context, setModalState) {
            return SafeArea(
              child: Padding(
                padding: const EdgeInsets.all(24.0),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        Text(
                          'Feedback Settings',
                          style: theme.textTheme.titleLarge?.copyWith(
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                        IconButton(
                          icon: const Icon(Icons.close),
                          onPressed: () {
                            AppFeedback.click();
                            Navigator.pop(context);
                          },
                        ),
                      ],
                    ),
                    const SizedBox(height: 16),
                    ListTile(
                      leading: Icon(
                        AppFeedback.isSoundEnabled ? Icons.volume_up : Icons.volume_off,
                        color: theme.colorScheme.primary,
                      ),
                      title: const Text('Sound Effects', style: TextStyle(fontWeight: FontWeight.bold)),
                      subtitle: const Text('Play subtle sounds on button clicks & selections'),
                      trailing: Switch(
                        value: AppFeedback.isSoundEnabled,
                        activeColor: theme.colorScheme.primary,
                        onChanged: (val) {
                          AppFeedback.isSoundEnabled = val;
                          AppFeedback.click();
                          setModalState(() {});
                          setState(() {});
                        },
                      ),
                    ),
                    const Divider(),
                    ListTile(
                      leading: Icon(
                        AppFeedback.isHapticEnabled ? Icons.vibration : Icons.mobile_off,
                        color: theme.colorScheme.primary,
                      ),
                      title: const Text('Haptic Vibration', style: TextStyle(fontWeight: FontWeight.bold)),
                      subtitle: const Text('Feel tactical vibrations on user interaction'),
                      trailing: Switch(
                        value: AppFeedback.isHapticEnabled,
                        activeColor: theme.colorScheme.primary,
                        onChanged: (val) {
                          AppFeedback.isHapticEnabled = val;
                          AppFeedback.click();
                          setModalState(() {});
                          setState(() {});
                        },
                      ),
                    ),
                    const SizedBox(height: 16),
                  ],
                ),
              ),
            );
          },
        );
      },
    );
  }
}

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

  @override
  State<RetailUniverseVisual> createState() => _RetailUniverseVisualState();
}

class _RetailUniverseVisualState extends State<RetailUniverseVisual> with TickerProviderStateMixin {
  late AnimationController _orbitController;
  late AnimationController _pulseController;
  int _activeIndex = 0;

  final List<Map<String, dynamic>> _retailUniverse = [
    {
      'title': 'Grocery & Retail',
      'subtitle': 'Groceries, Wholesale, Dept. Stores, Xerox, Stationery',
      'icon': Icons.shopping_basket_rounded,
      'color': Colors.green,
      'bgColor': const Color(0xFFE8F5E9),
    },
    {
      'title': 'Food & Beverages',
      'subtitle': 'Restaurants, Bakeries, Dairy, Ice Cream, Coffee Shops',
      'icon': Icons.restaurant_rounded,
      'color': Colors.orange,
      'bgColor': const Color(0xFFFFF3E0),
    },
    {
      'title': 'Wellness & Beauty',
      'subtitle': 'Salon, Spa, Beauty Parlours, Cosmetics, Fitness',
      'icon': Icons.spa_rounded,
      'color': Colors.pink,
      'bgColor': const Color(0xFFFCE4EC),
    },
    {
      'title': 'Fashion & Lifestyle',
      'subtitle': 'Fashion & Jewellery Boutique, Lifestyle, Footwear Stores',
      'icon': Icons.checkroom_rounded,
      'color': Colors.indigo,
      'bgColor': const Color(0xFFE8EAF6),
    },
    {
      'title': 'Electronics & Tech',
      'subtitle': 'Electricals, Computers, Mobiles, Appliances',
      'icon': Icons.computer_rounded,
      'color': Colors.blue,
      'bgColor': const Color(0xFFE3F2FD),
    },
    {
      'title': 'Logistics & Healthcare',
      'subtitle': 'PozoHealth, Smart Parking, Boating, Transport & Logistics',
      'icon': Icons.local_hospital_rounded,
      'color': Colors.teal,
      'bgColor': const Color(0xFFE0F2F1),
    },
  ];

  @override
  void initState() {
    super.initState();
    _orbitController = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 30),
    )..repeat();

    _pulseController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1500),
    )..repeat(reverse: true);

    _startAutoRotation();
  }

  void _startAutoRotation() {
    Future.delayed(const Duration(milliseconds: 3500), _nextCategory);
  }

  void _nextCategory() {
    if (!mounted) return;
    setState(() {
      _activeIndex = (_activeIndex + 1) % _retailUniverse.length;
    });
    _startAutoRotation();
  }

  void _setActiveCategory(int index) {
    AppFeedback.select();
    setState(() {
      _activeIndex = index;
    });
  }

  @override
  void dispose() {
    _orbitController.dispose();
    _pulseController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final activeData = _retailUniverse[_activeIndex];

    return Container(
      width: 320,
      height: 320,
      decoration: const BoxDecoration(
        color: Colors.transparent,
      ),
      child: Stack(
        alignment: Alignment.center,
        clipBehavior: Clip.none,
        children: [
          // 1. Orbital circular path
          Container(
            width: 200,
            height: 200,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              border: Border.all(
                color: Colors.grey[200]!,
                width: 1.5,
              ),
            ),
          ),

          // 2. Rotating orbital icons
          AnimatedBuilder(
            animation: _orbitController,
            builder: (context, child) {
              final double baseAngle = _orbitController.value * 2 * math.pi;
              return Stack(
                children: List.generate(_retailUniverse.length, (index) {
                  final double angle = baseAngle + (index * 2 * math.pi / _retailUniverse.length);
                  const double radius = 100.0;
                  final double x = radius * math.cos(angle);
                  final double y = radius * math.sin(angle);
                  final isCurrent = index == _activeIndex;
                  final item = _retailUniverse[index];

                  return Positioned(
                    left: 160.0 + x - 24.0,
                    top: 160.0 + y - 24.0,
                    child: InteractiveScale(
                      onTap: () => _setActiveCategory(index),
                      child: Container(
                        width: 48,
                        height: 48,
                        decoration: BoxDecoration(
                          color: isCurrent ? item['bgColor'] : Colors.white,
                          shape: BoxShape.circle,
                          border: Border.all(
                            color: isCurrent ? item['color'] : Colors.grey[300]!,
                            width: isCurrent ? 2 : 1,
                          ),
                          boxShadow: [
                            BoxShadow(
                              color: Colors.black.withOpacity(0.05),
                              blurRadius: 6,
                              offset: const Offset(0, 2),
                            ),
                          ],
                        ),
                        child: Icon(
                          item['icon'],
                          color: isCurrent ? item['color'] : Colors.grey[500],
                          size: 20,
                        ),
                      ),
                    ),
                  );
                }),
              );
            },
          ),

          // 3. Central active node with pulse animation
          ScaleTransition(
            scale: Tween<double>(begin: 0.95, end: 1.05).animate(
              CurvedAnimation(
                parent: _pulseController,
                curve: Curves.easeInOut,
              ),
            ),
            child: Container(
              width: 110,
              height: 110,
              decoration: BoxDecoration(
                color: activeData['bgColor'],
                shape: BoxShape.circle,
                border: Border.all(
                  color: activeData['color'],
                  width: 3,
                ),
                boxShadow: [
                  BoxShadow(
                    color: activeData['color'].withOpacity(0.2),
                    blurRadius: 24,
                    spreadRadius: 4,
                  ),
                ],
              ),
              child: Center(
                child: Icon(
                  activeData['icon'],
                  color: activeData['color'],
                  size: 38,
                ),
              ),
            ),
          ),

          // 4. Floating category text label at the bottom
          Positioned(
            bottom: -32,
            child: AnimatedSwitcher(
              duration: const Duration(milliseconds: 300),
              transitionBuilder: (child, animation) => FadeTransition(
                opacity: animation,
                child: SlideTransition(
                  position: Tween<Offset>(
                    begin: const Offset(0, 0.2),
                    end: Offset.zero,
                  ).animate(animation),
                  child: child,
                ),
              ),
              child: KeyedSubtree(
                key: ValueKey<int>(_activeIndex),
                child: Container(
                  width: 280,
                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(16),
                    border: Border.all(color: Colors.grey[100]!),
                    boxShadow: [
                      BoxShadow(
                        color: Colors.black.withOpacity(0.04),
                        blurRadius: 12,
                        offset: const Offset(0, 4),
                      )
                    ],
                  ),
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(
                        activeData['title'],
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.bold,
                          color: activeData['color'],
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        activeData['subtitle'],
                        textAlign: TextAlign.center,
                        maxLines: 2,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                          fontSize: 10,
                          color: Colors.grey[600],
                          height: 1.3,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}