import 'package:supabase_flutter/supabase_flutter.dart';
import '../constants/app_constants.dart';

class SupabaseService {
  static SupabaseClient get _supabase => Supabase.instance.client;

  // Initialize Supabase
  static Future<void> initialize() async {
    try {
      print('DEBUG: Inicializando Supabase...');

      await Supabase.initialize(
        url: AppConstants.supabaseUrl,
        anonKey: AppConstants.supabaseAnonKey,
      );

      print('DEBUG: Supabase inicializado com sucesso!');
    } catch (e) {
      print('DEBUG: Erro ao inicializar Supabase: $e');
      rethrow;
    }
  }

  // Get current user
  static User? get currentUser => _supabase.auth.currentUser;

  // Sign up with email and password
  static Future<AuthResponse> signUp({
    required String email,
    required String password,
    required String name,
  }) async {
    try {
      final response = await _supabase.auth.signUp(
        email: email,
        password: password,
        data: {'name': name},
      );

      if (response.user != null) {
        return response;
      } else {
        throw Exception('Falha ao criar usuário.');
      }
    } catch (e) {
      throw Exception('Erro ao criar conta: $e');
    }
  }

  // Sign in with email and password
  static Future<AuthResponse> signIn({
    required String email,
    required String password,
  }) async {
    try {
      return await _supabase.auth.signInWithPassword(
        email: email,
        password: password,
      );
    } catch (e) {
      throw Exception('Erro ao fazer login: $e');
    }
  }

  // Sign out
  static Future<void> signOut() async {
    try {
      await _supabase.auth.signOut();
    } catch (e) {
      throw Exception('Erro ao sair: $e');
    }
  }

  // Reset password
  static Future<void> resetPassword(String email) async {
    try {
      await _supabase.auth.resetPasswordForEmail(email);
    } catch (e) {
      throw Exception('Erro ao redefinir senha: $e');
    }
  }

  // Update user profile
  static Future<void> updateProfile({String? name, String? email}) async {
    try {
      final updates = <String, dynamic>{};
      if (name != null) updates['name'] = name;

      final userAttributes = UserAttributes(
        data: updates.isNotEmpty ? updates : null,
        email: email,
      );

      await _supabase.auth.updateUser(userAttributes);
    } catch (e) {
      throw Exception('Erro ao atualizar perfil: $e');
    }
  }

  // Test connection to Supabase
  static Future<bool> testConnection() async {
    try {
      final session = _supabase.auth.currentSession;
      return true;
    } catch (e) {
      return false;
    }
  }

  // Listen to auth state changes
  static Stream<AuthState> get authStateChanges =>
      _supabase.auth.onAuthStateChange;

  // Save a new run
  static Future<void> saveRun({
    required double distance,
    required double pace,
    required int duration,
  }) async {
    try {
      final userId = currentUser?.id;
      if (userId == null) {
        throw Exception('Usuário não autenticado');
      }

      // Insert new run
      await _supabase.from('runs').insert({
        'id_user': userId,
        'distance': distance,
        'pace': pace,
        'created_at': DateTime.now().toIso8601String(),
      });

      // Update user stats
      await _updateUserStats(userId, distance, pace);
    } catch (e) {
      throw Exception('Erro ao salvar corrida: $e');
    }
  }

  // Update user statistics
  static Future<void> _updateUserStats(
    String userId,
    double newDistance,
    double newPace,
  ) async {
    try {
      // Get current user stats
      final currentStats = await _supabase
          .from('user_stats')
          .select('best_pace, max_distance')
          .eq('id_user', userId)
          .maybeSingle();

      if (currentStats == null) {
        // Create new user stats record
        await _supabase.from('user_stats').insert({
          'id_user': userId,
          'best_pace': newPace,
          'max_distance': newDistance,
          'created_at': DateTime.now().toIso8601String(),
        });
      } else {
        // Update if new records are better
        final updates = <String, dynamic>{};

        if (currentStats['max_distance'] == null ||
            newDistance > currentStats['max_distance']) {
          updates['max_distance'] = newDistance;
        }

        if (currentStats['best_pace'] == null ||
            newPace < currentStats['best_pace']) {
          updates['best_pace'] = newPace;
        }

        if (updates.isNotEmpty) {
          await _supabase
              .from('user_stats')
              .update(updates)
              .eq('id_user', userId);
        }
      }
    } catch (e) {
      throw Exception('Erro ao atualizar estatísticas: $e');
    }
  }

  // Get user statistics
  static Future<Map<String, dynamic>?> getUserStats() async {
    try {
      final userId = currentUser?.id;
      if (userId == null) {
        throw Exception('Usuário não autenticado');
      }

      return await _supabase
          .from('user_stats')
          .select('*')
          .eq('id_user', userId)
          .maybeSingle();
    } catch (e) {
      throw Exception('Erro ao buscar estatísticas: $e');
    }
  }

  // Get user runs history
  static Future<List<Map<String, dynamic>>> getUserRuns({
    int limit = 50,
  }) async {
    try {
      final userId = currentUser?.id;
      if (userId == null) {
        throw Exception('Usuário não autenticado');
      }

      return await _supabase
          .from('runs')
          .select('*')
          .eq('id_user', userId)
          .order('created_at', ascending: false)
          .limit(limit);
    } catch (e) {
      throw Exception('Erro ao buscar histórico de corridas: $e');
    }
  }
}