import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'dart:async';
import '../../services/notification_service.dart';
import '../../services/user_service.dart';
import '../../services/auth_service.dart';
import '../../services/post_service.dart';
import '../../services/app_lifecycle_service.dart';
import '../../models/post_models.dart';
import '../../widgets/posts_list.dart';
import '../../utils/password_generator.dart';
import '../edit_profile_screen.dart';
import '../support_screen.dart';
import '../information_screen.dart';

class ProfilePage extends StatefulWidget {
  @override
  _ProfilePageState createState() => _ProfilePageState();
}

class _ProfilePageState extends State<ProfilePage> {
  String? fcmToken;
  final TextEditingController _tokenController = TextEditingController();
  bool isLoading = false;
  Map<String, dynamic>? userData;
  bool isLoadingUser = true;
  int totalLikes = 0;
  int totalPosts = 0;
  StreamSubscription<Map<String, dynamic>>? _userStreamSubscription;

  @override
  void initState() {
    super.initState();
    _loadFCMToken();
    _loadUserData();
    _loadUserStats();
    _setupUserStream();
  }

  @override
  void dispose() {
    _tokenController.dispose();
    _userStreamSubscription?.cancel();
    super.dispose();
  }

  void _setupUserStream() {
    print('Setting up user profile stream');
    _userStreamSubscription = UserService.getUserStream().listen(
      (updatedUserData) {
        print('📱 User profile stream received data update');
        if (mounted) {
          // Update UI directly with stream data instead of making API call
          setState(() {
            userData = updatedUserData;
            isLoadingUser = false;
          });
          // Only reload stats which are from posts service
          _loadUserStats();
        }
      },
      onError: (error) {
        print('User profile stream error: $error');
      },
    );
    
    // Trigger stream with any existing cached data
    Future.delayed(Duration(milliseconds: 100), () {
      if (mounted) {
        UserService.notifyStreamWithCurrentData();
      }
    });
  }

  Future<void> _loadFCMToken() async {
    setState(() {
      isLoading = true;
    });

    try {
      final token = await NotificationService().getToken();
      setState(() {
        fcmToken = token;
        _tokenController.text = token ?? 'Token not available';
        isLoading = false;
      });
    } catch (e) {
      setState(() {
        fcmToken = null;
        _tokenController.text = 'Error loading token: $e';
        isLoading = false;
      });
    }
  }

  Future<void> _loadUserData({bool forceRefresh = false}) async {
    // Don't show loading for cached data unless forcing refresh
    final isInitialLoad = userData == null;
    
    if (isInitialLoad || forceRefresh) {
      setState(() {
        isLoadingUser = true;
      });
    }

    final result = await UserService.getCurrentUser(forceRefresh: forceRefresh);

    if (mounted) {
      setState(() {
        if (result['success'] == true) {
          userData = result['data'];
        } else {
          userData = null;
          if (isInitialLoad) {
            _showErrorAlert(result['message'] ?? 'Failed to load user data');
          }
        }
        isLoadingUser = false;
      });
    }
  }

  Future<void> _loadUserStats() async {
    final result = await PostService.getUserPosts();

    if (mounted) {
      setState(() {
        if (result['success'] == true) {
          final posts = result['posts'] as List<Post>;
          totalPosts = posts.length;
          totalLikes = posts.fold(0, (sum, post) => sum + post.likes);
        } else {
          totalPosts = 0;
          totalLikes = 0;
        }
      });
    }
  }

  void _showErrorAlert(String message) {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text('Error'),
        content: Text(message),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text('OK', style: TextStyle(color: Color(0xFF6A4C93))),
          ),
        ],
      ),
    );
  }

  Future<void> _copyToClipboard() async {
    if (fcmToken != null && fcmToken!.isNotEmpty) {
      await Clipboard.setData(ClipboardData(text: fcmToken!));
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('FCM Token copied to clipboard'),
          backgroundColor: Color(0xFF6A4C93),
        ),
      );
    }
  }

  void _navigateToSettings() {
    Navigator.of(
      context,
    ).push(MaterialPageRoute(builder: (context) => SettingsPage()));
  }

  void _navigateToEditProfile() async {
    final result = await Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) => EditProfileScreen(userData: userData),
      ),
    );
    
    if (result == true) {
      // Profile was updated, refresh user data
      _loadUserData(forceRefresh: true);
    }
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: false, // Prevent back navigation from profile page
      onPopInvoked: (bool didPop) {
        // Prevent any pop behavior, including iOS back gesture
        if (!didPop) {
          // Do nothing - stay on profile page
        }
      },
      child: Scaffold(
      appBar: AppBar(
        title: Text('Profile', style: TextStyle(fontWeight: FontWeight.w600)),
        backgroundColor: Colors.white,
        foregroundColor: Color(0xFF6A4C93),
        elevation: 0,
        centerTitle: true,
        actions: [
          if (userData != null)
            IconButton(
              onPressed: _navigateToEditProfile,
              icon: Icon(Icons.edit),
              tooltip: 'Edit Profile',
            ),
          IconButton(
            onPressed: _navigateToSettings,
            icon: Icon(Icons.settings),
          ),
        ],
        bottom: PreferredSize(
          preferredSize: Size.fromHeight(1),
          child: Container(height: 1, color: Colors.grey[200]),
        ),
        automaticallyImplyLeading: false,
      ),
      body: SingleChildScrollView(
        child: Column(
          children: [
            Container(
              padding: EdgeInsets.all(24),
              child: Column(
                children: [
                  if (isLoadingUser)
                    CircularProgressIndicator(
                      valueColor: AlwaysStoppedAnimation<Color>(
                        Color(0xFF6A4C93),
                      ),
                    )
                  else if (userData != null) ...[
                    CircleAvatar(
                      radius: 50,
                      backgroundColor: Color(0xFF6A4C93),
                      child: Text(
                        (userData!['displayName'] ?? 'U')
                            .substring(0, 1)
                            .toUpperCase(),
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 36,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                    SizedBox(height: 16),
                    Text(
                      userData!['displayName'] ?? 'Unknown User',
                      style: TextStyle(
                        fontSize: 24,
                        fontWeight: FontWeight.bold,
                        color: Colors.black87,
                      ),
                    ),
                    SizedBox(height: 4),
                    Text(
                      '@${userData!['username'] ?? 'unknown'}',
                      style: TextStyle(fontSize: 16, color: Colors.grey[600]),
                    ),
                  ] else ...[
                    Icon(
                      Icons.error_outline,
                      size: 50,
                      color: Colors.grey[400],
                    ),
                    SizedBox(height: 16),
                    Text(
                      'Failed to load user data',
                      style: TextStyle(fontSize: 18, color: Colors.grey[600]),
                    ),
                    SizedBox(height: 8),
                    ElevatedButton(
                      onPressed: _loadUserData,
                      style: ElevatedButton.styleFrom(
                        backgroundColor: Color(0xFF6A4C93),
                        foregroundColor: Colors.white,
                      ),
                      child: Text('Retry'),
                    ),
                  ],
                  SizedBox(height: 20),
                  if (userData != null)
                    Row(
                      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                      children: [
                        Column(
                          children: [
                            Text(
                              '$totalPosts',
                              style: TextStyle(
                                fontSize: 20,
                                fontWeight: FontWeight.bold,
                                color: Color(0xFF6A4C93),
                              ),
                            ),
                            Text(
                              'Posts',
                              style: TextStyle(
                                fontSize: 14,
                                color: Colors.grey[600],
                              ),
                            ),
                          ],
                        ),
                        Column(
                          children: [
                            Text(
                              '$totalLikes',
                              style: TextStyle(
                                fontSize: 20,
                                fontWeight: FontWeight.bold,
                                color: Color(0xFF6A4C93),
                              ),
                            ),
                            Text(
                              'Likes Received',
                              style: TextStyle(
                                fontSize: 14,
                                color: Colors.grey[600],
                              ),
                            ),
                          ],
                        ),
                      ],
                    ),
                ],
              ),
            ),
            if (userData != null) ...[
              Container(
                height: 1,
                color: Colors.grey[200],
                margin: EdgeInsets.symmetric(horizontal: 16),
              ),
              SizedBox(height: 16),
              ProfilePostsList(
                fetchPosts: () => PostService.getUserPosts(),
                onStatsUpdate: (posts, likes) {
                  setState(() {
                    totalPosts = posts;
                    totalLikes = likes;
                  });
                },
              ),
            ],
          ],
        ),
        ),
      ),
    );
  }
}

class SettingsPage extends StatefulWidget {
  @override
  _SettingsPageState createState() => _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {
  // Admin user creation
  Map<String, dynamic>? userData;
  bool isLoadingUser = true;
  bool isCreatingUser = false;
  final TextEditingController _emailController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  final TextEditingController _displayNameController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _loadUserData();
    _generatePassword();
  }

  @override
  void dispose() {
    _emailController.dispose();
    _passwordController.dispose();
    _displayNameController.dispose();
    super.dispose();
  }


  Future<void> _loadUserData() async {
    setState(() {
      isLoadingUser = true;
    });

    final result = await UserService.getCurrentUser();

    setState(() {
      isLoadingUser = false;
      if (result['success'] == true) {
        userData = result['data'];
      } else {
        userData = null;
      }
    });
  }

  void _generatePassword() {
    _passwordController.text = PasswordGenerator.generateReadablePassword();
  }

  bool get _isAdmin {
    return userData?['role'] == 'ADMIN';
  }

  Future<Map<String, dynamic>> _createUserAccount() async {
    if (_emailController.text.trim().isEmpty ||
        _displayNameController.text.trim().isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Please fill in all fields'),
          backgroundColor: Colors.red,
        ),
      );
      return {'success': false, 'message': 'Please fill in all fields'};
    }

    setState(() {
      isCreatingUser = true;
    });

    try {
      final result = await UserService.createUser(
        email: _emailController.text.trim(),
        password: _passwordController.text,
        displayName: _displayNameController.text.trim(),
      );

      setState(() {
        isCreatingUser = false;
      });

      return result;
    } catch (e) {
      setState(() {
        isCreatingUser = false;
      });

      return {'success': false, 'message': 'Error creating user: $e'};
    }
  }

  void _signOut() async {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Sign Out'),
          content: Text('Are you sure you want to sign out?'),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(context).pop(),
              child: Text('Cancel'),
            ),
            TextButton(
              onPressed: () async {
                Navigator.of(context).pop();

                // Stop polling services before logout
                AppLifecycleService.dispose();
                await AuthService.logout();

                Navigator.of(
                  context,
                ).pushNamedAndRemoveUntil('/', (route) => false);
              },
              child: Text('Sign Out', style: TextStyle(color: Colors.red)),
            ),
          ],
        );
      },
    );
  }

  void _showCredentialsDialog(String email, String password) {
    final credentialsText = 'Email: $email\nPassword: $password';
    final TextEditingController credentialsController = TextEditingController(
      text: credentialsText,
    );

    showDialog(
      context: context,
      builder: (BuildContext dialogContext) {
        return AlertDialog(
          title: Text('Account Created Successfully!'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                'Share these credentials with the user:',
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.w500),
              ),
              SizedBox(height: 16),

              TextField(
                controller: credentialsController,
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  suffixIcon: IconButton(
                    icon: Icon(Icons.copy),
                    onPressed: () async {
                      await Clipboard.setData(
                        ClipboardData(text: credentialsText),
                      );
                      ScaffoldMessenger.of(context).showSnackBar(
                        SnackBar(
                          content: Text('Credentials copied to clipboard'),
                          backgroundColor: Color(0xFF6A4C93),
                        ),
                      );
                    },
                    tooltip: 'Copy credentials',
                  ),
                ),
                maxLines: 2,
                readOnly: true,
                style: TextStyle(fontFamily: 'monospace', fontSize: 14),
              ),
            ],
          ),
          actions: [
            ElevatedButton(
              onPressed: () => Navigator.of(dialogContext).pop(),
              style: ElevatedButton.styleFrom(
                backgroundColor: Color(0xFF6A4C93),
                foregroundColor: Colors.white,
              ),
              child: Text('Done'),
            ),
          ],
        );
      },
    );
  }

  void _showCreateAccountDialog(BuildContext context) {
    showDialog(
      context: context,
      builder: (BuildContext dialogContext) {
        return StatefulBuilder(
          builder: (context, setDialogState) {
            return AlertDialog(
              title: Text('Create Account'),
              content: SingleChildScrollView(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    TextField(
                      controller: _emailController,
                      decoration: InputDecoration(
                        labelText: 'Email',
                        border: OutlineInputBorder(),
                        prefixIcon: Icon(Icons.email),
                      ),
                      keyboardType: TextInputType.emailAddress,
                    ),
                    SizedBox(height: 16),

                    TextField(
                      controller: _displayNameController,
                      decoration: InputDecoration(
                        labelText: 'Display Name',
                        border: OutlineInputBorder(),
                        prefixIcon: Icon(Icons.person),
                      ),
                    ),
                    SizedBox(height: 16),

                    TextField(
                      controller: _passwordController,
                      decoration: InputDecoration(
                        labelText: 'Password',
                        border: OutlineInputBorder(),
                        prefixIcon: Icon(Icons.lock),
                        suffixIcon: IconButton(
                          icon: Icon(Icons.refresh),
                          onPressed: () {
                            setDialogState(() {
                              _generatePassword();
                            });
                          },
                          tooltip: 'Generate new password',
                        ),
                      ),
                      readOnly: true,
                      style: TextStyle(
                        fontFamily: 'monospace',
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    SizedBox(height: 8),

                    Text(
                      'Password is auto-generated for security',
                      style: TextStyle(fontSize: 12, color: Colors.grey[600]),
                    ),
                  ],
                ),
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.of(dialogContext).pop(),
                  child: Text('Cancel'),
                ),
                ElevatedButton(
                  onPressed: isCreatingUser
                      ? null
                      : () async {
                          final email = _emailController.text.trim();
                          final password = _passwordController.text;

                          final result = await _createUserAccount();

                          if (mounted) {
                            Navigator.of(dialogContext).pop();

                            if (result['success']) {
                              _showCredentialsDialog(email, password);
                              // Clear form
                              _emailController.clear();
                              _displayNameController.clear();
                              _generatePassword();
                            } else {
                              ScaffoldMessenger.of(context).showSnackBar(
                                SnackBar(
                                  content: Text(
                                    result['message'] ??
                                        'Failed to create user',
                                  ),
                                  backgroundColor: Colors.red,
                                ),
                              );
                            }
                          }
                        },
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Color(0xFF6A4C93),
                    foregroundColor: Colors.white,
                  ),
                  child: isCreatingUser
                      ? SizedBox(
                          width: 16,
                          height: 16,
                          child: CircularProgressIndicator(
                            strokeWidth: 2,
                            valueColor: AlwaysStoppedAnimation<Color>(
                              Colors.white,
                            ),
                          ),
                        )
                      : Text('Create'),
                ),
              ],
            );
          },
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: true, // Allow back navigation to go back to profile page only
      child: Scaffold(
        appBar: AppBar(
          title: Text('Settings', style: TextStyle(fontWeight: FontWeight.w600)),
        backgroundColor: Colors.white,
        foregroundColor: Color(0xFF6A4C93),
        elevation: 0,
        bottom: PreferredSize(
          preferredSize: Size.fromHeight(1),
          child: Container(height: 1, color: Colors.grey[200]),
        ),
        automaticallyImplyLeading: true,
      ),
      body: Padding(
        padding: EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            if (!isLoadingUser && _isAdmin) ...[
              Text(
                'Admin Tools',
                style: TextStyle(
                  fontSize: 20,
                  fontWeight: FontWeight.w600,
                  color: Color(0xFF6A4C93),
                ),
              ),
              SizedBox(height: 16),

              Container(
                width: double.infinity,
                height: 56,
                child: ElevatedButton.icon(
                  onPressed: () => _showCreateAccountDialog(context),
                  icon: Icon(Icons.person_add, size: 20),
                  label: Text('Create an Account'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Color(0xFF6A4C93),
                    foregroundColor: Colors.white,
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                    padding: EdgeInsets.symmetric(horizontal: 16),
                  ),
                ),
              ),

              SizedBox(height: 32),
            ],

            Text(
              'App Information',
              style: TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.w600,
                color: Color(0xFF6A4C93),
              ),
            ),
            SizedBox(height: 16),

            Container(
              width: double.infinity,
              height: 56,
              child: ElevatedButton.icon(
                onPressed: () => Navigator.of(context).push(
                  MaterialPageRoute(builder: (context) => SupportScreen()),
                ),
                icon: Icon(Icons.help_outline, size: 20),
                label: Text('Support'),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Color(0xFF6A4C93),
                  foregroundColor: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                  padding: EdgeInsets.symmetric(horizontal: 16),
                ),
              ),
            ),

            SizedBox(height: 16),

            Container(
              width: double.infinity,
              height: 56,
              child: ElevatedButton.icon(
                onPressed: () => Navigator.of(context).push(
                  MaterialPageRoute(builder: (context) => InformationScreen()),
                ),
                icon: Icon(Icons.info_outline, size: 20),
                label: Text('Information'),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Color(0xFF6A4C93),
                  foregroundColor: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                  padding: EdgeInsets.symmetric(horizontal: 16),
                ),
              ),
            ),

            SizedBox(height: 32),

            Container(
              width: double.infinity,
              height: 56,
              child: ElevatedButton.icon(
                onPressed: () => Navigator.of(context).push(
                  MaterialPageRoute(
                    builder: (context) => EditProfileScreen(userData: userData),
                  ),
                ),
                icon: Icon(Icons.edit, size: 20),
                label: Text('Update your Profile'),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Color(0xFF6A4C93),
                  foregroundColor: Colors.white,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                  padding: EdgeInsets.symmetric(horizontal: 16),
                ),
              ),
            ),

            SizedBox(height: 16),

            Container(
              width: double.infinity,
              height: 56,
              child: ElevatedButton.icon(
                onPressed: _signOut,
                icon: Icon(Icons.logout, color: Colors.red, size: 20),
                label: Text('Sign Out', style: TextStyle(color: Colors.red)),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Colors.white,
                  side: BorderSide(color: Colors.red),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                  padding: EdgeInsets.symmetric(horizontal: 16),
                ),
              ),
            ),
          ],
        ),
        ),
      ),
    );
  }
}