import 'package:supabase_flutter/supabase_flutter.dart';

class UserInfo {
  final String? userId;
  final String? email;
  final String? username;
  final String? avatarUrl;
  
  UserInfo({this.userId, this.email, this.username, this.avatarUrl});
}

class ProfileService {
  final _supabase = Supabase.instance.client;
  
  // Cache to store profile data
  final Map<String, String> _usernameCache = {};
  final Map<String, String> _emailCache = {};
  final Map<String, String> _avatarUrlCache = {};
  
  String? _currentUserEmail;
  String? _currentUsername;
  String? _currentAvatarUrl;
  
  Future<void> initialize() async {
    await _loadCurrentUserProfile();
  }
  
  void dispose() {
    // No resources to clean up
  }
  
  Future<void> _loadCurrentUserProfile() async {
    final userId = _supabase.auth.currentUser?.id;
    _currentUserEmail = _supabase.auth.currentUser?.email;
    
    if (userId == null) return;
    
    // Store current user email in cache
    if (_currentUserEmail != null) {
      _emailCache[userId] = _currentUserEmail!;
    }
    
    // Try to get profile data
    try {
      final profile = await _supabase
        .from('profiles')
        .select('username, avatar_url')
        .eq('user_id', userId)
        .single();
      
      if (profile != null) {
        if (profile['username'] != null && profile['username'].toString().isNotEmpty) {
          _currentUsername = profile['username'] as String;
          _usernameCache[userId] = _currentUsername!;
        }
        
        if (profile['avatar_url'] != null && profile['avatar_url'].toString().isNotEmpty) {
          _currentAvatarUrl = profile['avatar_url'] as String;
          _avatarUrlCache[userId] = _currentAvatarUrl!;
        }
      }
    } catch (e) {
      print("[ERROR] Failed to get current user profile: $e");
    }
    
    // Use email as fallback username
    if (_currentUsername == null && _currentUserEmail != null) {
      _currentUsername = _currentUserEmail!.split('@')[0];
    }
  }
  
  Future<UserInfo> getCurrentUser() async {
    final userId = _supabase.auth.currentUser?.id;
    
    if (_currentUsername == null || _currentAvatarUrl == null) {
      await _loadCurrentUserProfile();
    }
    
    return UserInfo(
      userId: userId,
      email: _currentUserEmail,
      username: _currentUsername,
      avatarUrl: _currentAvatarUrl,
    );
  }
  
  Future<UserInfo> getUserProfile(String userId) async {
    // Check if we have this user in cache
    final email = _emailCache[userId];
    final username = _usernameCache[userId];
    final avatarUrl = _avatarUrlCache[userId];
    
    // If we have all the data, return from cache
    if (username != null && avatarUrl != null) {
      return UserInfo(
        userId: userId,
        email: email,
        username: username,
        avatarUrl: avatarUrl,
      );
    }
    
    // Otherwise fetch from database
    try {
      final profile = await _supabase
        .from('profiles')
        .select('username, avatar_url')
        .eq('user_id', userId)
        .maybeSingle();
      
      if (profile != null) {
        final fetchedUsername = profile['username'] as String?;
        final fetchedAvatarUrl = profile['avatar_url'] as String?;
        
        // Update cache
        if (fetchedUsername != null && fetchedUsername.isNotEmpty) {
          _usernameCache[userId] = fetchedUsername;
        }
        
        if (fetchedAvatarUrl != null && fetchedAvatarUrl.isNotEmpty) {
          _avatarUrlCache[userId] = fetchedAvatarUrl;
        }
        
        return UserInfo(
          userId: userId,
          email: email,
          username: fetchedUsername ?? (email != null ? email.split('@')[0] : null),
          avatarUrl: fetchedAvatarUrl,
        );
      }
    } catch (e) {
      print("[ERROR] Failed to fetch user profile: $e");
    }
    
    // Return what we have if fetch failed
    return UserInfo(
      userId: userId,
      email: email,
      username: username ?? (email != null ? email.split('@')[0] : null),
      avatarUrl: avatarUrl,
    );
  }
}