import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:image_picker/image_picker.dart';

import '../app/app_state.dart';
import '../app/app_router.dart';
import '../services/api.dart';
import '../services/auth_storage.dart';
import '../widgets/rescan_button.dart';

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

  @override
  State<AccountScreen> createState() => _AccountScreenState();
}

class _AccountScreenState extends State<AccountScreen> {
  bool _isLoggingOut = false;
  bool _isLoadingAvatar = true;
  bool _isUploadingAvatar = false;
  String? _avatarUrl;
  String? _userName;

  final ImagePicker _picker = ImagePicker();

  @override
  void initState() {
    super.initState();
    _loadAvatar();
    _loadProfile();
  }

  Future<void> _loadAvatar() async {
    // Don't try to load avatar if not logged in
    final appState = context.read<AppState>();
    if (!appState.isLoggedIn) {
      setState(() => _isLoadingAvatar = false);
      return;
    }

    try {
      final avatarInfo = await Api.getAvatar();
      if (mounted) {
        setState(() {
          _avatarUrl = avatarInfo.hasAvatar ? avatarInfo.avatarUrl : null;
          _isLoadingAvatar = false;
        });
      }
    } catch (e) {
      debugPrint('Error loading avatar: $e');
      if (mounted) {
        setState(() => _isLoadingAvatar = false);
      }
    }
  }

  Future<void> _loadProfile() async {
    final appState = context.read<AppState>();
    if (!appState.isLoggedIn) return;

    try {
      final profile = await Api.getProfile();
      if (mounted) {
        final firstName = profile.firstName;
        final lastInitial = profile.lastName.isNotEmpty
            ? '${profile.lastName[0]}.'
            : '';
        setState(() {
          _userName = '$firstName $lastInitial'.trim();
        });
      }
    } catch (e) {
      debugPrint('Error loading profile: $e');
    }
  }

  Future<void> _pickAndUploadAvatar() async {
    // Check if user is logged in first
    final appState = context.read<AppState>();
    if (!appState.isLoggedIn) {
      final shouldLogin = await showDialog<bool>(
        context: context,
        builder: (context) => AlertDialog(
          title: const Text('Login Required'),
          content: const Text('Please login to upload a profile photo.'),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(context, false),
              child: const Text('Cancel'),
            ),
            FilledButton(
              onPressed: () => Navigator.pop(context, true),
              child: const Text('Login'),
            ),
          ],
        ),
      );

      if (shouldLogin == true && mounted) {
        Navigator.of(context).pushNamed(AppRoutes.login);
      }
      return;
    }

    // Show picker options
    final source = await showModalBottomSheet<ImageSource>(
      context: context,
      builder: (context) => SafeArea(
        child: Wrap(
          children: [
            ListTile(
              leading: const Icon(Icons.camera_alt),
              title: const Text('Take Photo'),
              onTap: () => Navigator.pop(context, ImageSource.camera),
            ),
            ListTile(
              leading: const Icon(Icons.photo_library),
              title: const Text('Choose from Gallery'),
              onTap: () => Navigator.pop(context, ImageSource.gallery),
            ),
          ],
        ),
      ),
    );

    if (source == null) return;

    try {
      final XFile? image = await _picker.pickImage(
        source: source,
        maxWidth: 500,
        maxHeight: 500,
        imageQuality: 85,
      );

      if (image == null) return;

      setState(() => _isUploadingAvatar = true);

      final newAvatarUrl = await Api.uploadAvatar(image.path);

      if (mounted) {
        setState(() {
          _avatarUrl = newAvatarUrl;
          _isUploadingAvatar = false;
        });

        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: const Text('Avatar updated! Servers can now recognize you.', style: TextStyle(color: Colors.black)),
            backgroundColor: const Color(0xFF90EE90),
            behavior: SnackBarBehavior.floating,
            margin: const EdgeInsets.only(bottom: 80, left: 16, right: 16),
          ),
        );
      }
    } catch (e) {
      debugPrint('Error uploading avatar: $e');
      if (mounted) {
        setState(() => _isUploadingAvatar = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Failed to upload avatar: $e', style: const TextStyle(color: Colors.black)),
            backgroundColor: const Color(0xFF90EE90),
            behavior: SnackBarBehavior.floating,
            margin: const EdgeInsets.only(bottom: 80, left: 16, right: 16),
          ),
        );
      }
    }
  }

  Future<void> _handleSignOut() async {
    final confirm = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Sign Out'),
        content: const Text('Are you sure you want to sign out?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text('Sign Out'),
          ),
        ],
      ),
    );

    if (confirm != true || !mounted) return;

    setState(() => _isLoggingOut = true);

    try {
      // Clear stored auth
      await AuthStorage.clearAuth();

      // Clear API token
      Api.clearAuthToken();

      // Clear app state
      if (mounted) {
        final appState = context.read<AppState>();
        appState.clearAll();

        // Navigate to login
        Navigator.of(context).pushNamedAndRemoveUntil(
          AppRoutes.login,
          (route) => false,
        );
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isLoggingOut = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Error signing out: $e', style: const TextStyle(color: Colors.black)),
            backgroundColor: const Color(0xFF90EE90),
            behavior: SnackBarBehavior.floating,
            margin: const EdgeInsets.only(bottom: 80, left: 16, right: 16),
          ),
        );
      }
    }
  }

  Widget _buildAvatar() {
    if (_isLoadingAvatar) {
      return CircleAvatar(
        radius: 40,
        backgroundColor: Theme.of(context).colorScheme.surfaceContainerHighest,
        child: const SizedBox(
          width: 24,
          height: 24,
          child: CircularProgressIndicator(strokeWidth: 2),
        ),
      );
    }

    if (_isUploadingAvatar) {
      return Stack(
        children: [
          CircleAvatar(
            radius: 40,
            backgroundColor: Theme.of(context).colorScheme.surfaceContainerHighest,
            backgroundImage: _avatarUrl != null ? NetworkImage(_avatarUrl!) : null,
            child: _avatarUrl == null
                ? Icon(
                    Icons.person,
                    size: 40,
                    color: Theme.of(context).colorScheme.onSurfaceVariant,
                  )
                : null,
          ),
          Positioned.fill(
            child: Container(
              decoration: BoxDecoration(
                color: Colors.black45,
                shape: BoxShape.circle,
              ),
              child: const Center(
                child: SizedBox(
                  width: 24,
                  height: 24,
                  child: CircularProgressIndicator(
                    strokeWidth: 2,
                    valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
                  ),
                ),
              ),
            ),
          ),
        ],
      );
    }

    return GestureDetector(
      onTap: _pickAndUploadAvatar,
      child: Stack(
        children: [
          CircleAvatar(
            radius: 40,
            backgroundColor: Theme.of(context).colorScheme.surfaceContainerHighest,
            backgroundImage: _avatarUrl != null ? NetworkImage(_avatarUrl!) : null,
            child: _avatarUrl == null
                ? Icon(
                    Icons.person,
                    size: 40,
                    color: Theme.of(context).colorScheme.onSurfaceVariant,
                  )
                : null,
          ),
          Positioned(
            right: 0,
            bottom: 0,
            child: Container(
              padding: const EdgeInsets.all(4),
              decoration: BoxDecoration(
                color: Theme.of(context).colorScheme.primary,
                shape: BoxShape.circle,
                border: Border.all(
                  color: Theme.of(context).colorScheme.surface,
                  width: 2,
                ),
              ),
              child: Icon(
                Icons.camera_alt,
                size: 16,
                color: Theme.of(context).colorScheme.onPrimary,
              ),
            ),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final appState = context.watch<AppState>();

    // If not logged in, show login prompt
    if (!appState.isLoggedIn) {
      return Scaffold(
        appBar: AppBar(
          title: const Text('Account'),
          actions: const [
            RescanButton(),
          ],
        ),
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(32),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  Icons.person_outline,
                  size: 80,
                  color: Theme.of(context).colorScheme.onSurfaceVariant,
                ),
                const SizedBox(height: 24),
                Text(
                  'Sign in to access your account',
                  style: Theme.of(context).textTheme.titleLarge,
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 8),
                Text(
                  'View order history, manage your profile, and more.',
                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                        color: Theme.of(context).colorScheme.onSurfaceVariant,
                      ),
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 32),
                FilledButton.icon(
                  onPressed: () {
                    Navigator.of(context).pushNamed(AppRoutes.login);
                  },
                  icon: const Icon(Icons.login),
                  label: const Text('Sign In'),
                  style: FilledButton.styleFrom(
                    padding: const EdgeInsets.symmetric(horizontal: 32, vertical: 16),
                  ),
                ),
              ],
            ),
          ),
        ),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('Account'),
        actions: const [
          RescanButton(),
        ],
      ),
      body: ListView(
        children: [
          // User info header with avatar
          Container(
            padding: const EdgeInsets.all(24),
            color: Theme.of(context).colorScheme.primaryContainer.withValues(alpha: 0.3),
            child: Column(
              children: [
                _buildAvatar(),
                const SizedBox(height: 16),
                Text(
                  _userName ?? 'User #${appState.userId ?? "?"}',
                  style: Theme.of(context).textTheme.titleLarge,
                ),
                const SizedBox(height: 4),
                Text(
                  _avatarUrl != null
                      ? 'Tap photo to update'
                      : 'Tap to add a photo for server recognition',
                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
                        color: Theme.of(context).colorScheme.onSurfaceVariant,
                      ),
                ),
              ],
            ),
          ),

          const SizedBox(height: 8),

          // Order History
          ListTile(
            leading: const Icon(Icons.receipt_long),
            title: const Text('Order History'),
            subtitle: const Text('View your past orders'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => Navigator.pushNamed(context, AppRoutes.orderHistory),
          ),

          const Divider(height: 1),

          // Delivery Addresses
          ListTile(
            leading: const Icon(Icons.location_on),
            title: const Text('Delivery Addresses'),
            subtitle: const Text('Manage your addresses'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => Navigator.pushNamed(context, AppRoutes.addressList),
          ),

          const Divider(height: 1),

          // Profile Settings
          ListTile(
            leading: const Icon(Icons.settings),
            title: const Text('Profile Settings'),
            subtitle: const Text('Update your name'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => Navigator.pushNamed(context, AppRoutes.profileSettings),
          ),

          const Divider(height: 1),

          // About Payfrit
          ListTile(
            leading: const Icon(Icons.info_outline),
            title: const Text('About Payfrit'),
            subtitle: const Text('App info and features'),
            trailing: const Icon(Icons.chevron_right),
            onTap: () => Navigator.pushNamed(context, AppRoutes.about),
          ),

          const Divider(height: 1),

          const SizedBox(height: 24),

          // Sign Out button
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: OutlinedButton.icon(
              onPressed: _isLoggingOut ? null : _handleSignOut,
              icon: _isLoggingOut
                  ? const SizedBox(
                      width: 20,
                      height: 20,
                      child: CircularProgressIndicator(strokeWidth: 2),
                    )
                  : const Icon(Icons.logout),
              label: Text(_isLoggingOut ? 'Signing out...' : 'Sign Out'),
              style: OutlinedButton.styleFrom(
                foregroundColor: Theme.of(context).colorScheme.error,
                side: BorderSide(color: Theme.of(context).colorScheme.error),
                padding: const EdgeInsets.symmetric(vertical: 12),
              ),
            ),
          ),

          const SizedBox(height: 32),
        ],
      ),
    );
  }
}