import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:insparkspokalen_ui/models/teamModel.dart';
import 'package:insparkspokalen_ui/models/userModel.dart';

/// A service to synchronize team and user data with improved synchronization
class TeamUserSyncService with ChangeNotifier {
  // Singleton pattern
  static final TeamUserSyncService _instance = TeamUserSyncService._internal();
  factory TeamUserSyncService() => _instance;
  TeamUserSyncService._internal();

  // Base URLs
  final String baseUrlTeam = 'https://group-10-15.pvt.dsv.su.se/team';
  final String baseUrlUser = 'https://group-10-15.pvt.dsv.su.se/user';

  // Current data
  TeamModel? _currentTeam;
  UserModel? _currentUser;
  List<TeamModel> _allTeams = [];
  
  // Flag to track ongoing operations to prevent redundant requests
  bool _isSyncing = false;

  // Getters
  TeamModel? get currentTeam => _currentTeam;
  UserModel? get currentUser => _currentUser;
  List<TeamModel> get allTeams => _allTeams;
  bool get isSyncing => _isSyncing;

  // Set current user with improved team synchronization
  Future<void> setCurrentUser(UserModel user) async {
    _currentUser = user;
    notifyListeners();
    
    // When user is set, attempt to fetch their team
    if (user != null) {
      await syncUserTeamData(user.email);
    }
  }
  
  // Comprehensive synchronization of user team data
  Future<void> syncUserTeamData(String email) async {
    if (_isSyncing) return;
    
    _isSyncing = true;
    try {
      // 1. Get the user's team ID
      final teamId = await fetchUserTeam(email);
      
      // 2. If teamId exists, fetch the complete team data
      if (teamId != null) {
        await fetchTeamById(teamId);
      } else {
        // Clear current team if user doesn't belong to any team
        _currentTeam = null;
        notifyListeners();
      }
      
      // 3. Always fetch all teams to keep the leaderboard updated
      await fetchAllTeams();
    } finally {
      _isSyncing = false;
    }
  }

  // Fetch the current user's team ID
  Future<int?> fetchUserTeam(String email) async {
    final url = Uri.parse('$baseUrlUser/get-user-team/$email');
    
    try {
      final response = await http.get(url);
      
      if (response.statusCode == 200 && response.body.isNotEmpty) {
        // Handle potential JSON format from the API
        var responseData = response.body;
        
        // Check if the response is JSON
        try {
          if (responseData.startsWith('{') || responseData.startsWith('[')) {
            var jsonData = jsonDecode(responseData);
            if (jsonData is Map && jsonData.containsKey('teamId')) {
              return jsonData['teamId'] as int;
            }
          }
        } catch (_) {
          // Not JSON, continue with normal parsing
        }
        
        // Try parsing as a simple integer
        try {
          return int.parse(responseData);
        } catch (e) {
          print('Error parsing team ID: $e');
          return null;
        }
      }
    } catch (e) {
      print('Error fetching user team: $e');
    }
    
    return null;
  }

  // Fetch a team by ID with improved error handling
  Future<TeamModel?> fetchTeamById(int teamId) async {
    final url = Uri.parse('$baseUrlTeam/get-team/$teamId');
    
    try {
      final response = await http.get(url);
      
      if (response.statusCode == 200 && response.body.isNotEmpty) {
        final teamData = jsonDecode(response.body);
        _currentTeam = TeamModel.fromJson(teamData);
        notifyListeners();
        return _currentTeam;
      } else if (response.statusCode == 404) {
        // Team not found, clear current team
        _currentTeam = null;
        notifyListeners();
      }
    } catch (e) {
      print('Error fetching team: $e');
    }
    
    return null;
  }

  // Fetch all teams with improved sorting
  Future<List<TeamModel>> fetchAllTeams() async {
    final url = Uri.parse('$baseUrlTeam/all');
    
    try {
      final response = await http.get(url);
      
      if (response.statusCode == 200) {
        final List<dynamic> data = jsonDecode(response.body);
        _allTeams = data.map((json) => TeamModel.fromJson(json)).toList();
        
        // Sort teams by score (descending) for leaderboard display
        _allTeams.sort((a, b) => b.score.compareTo(a.score));
        
        notifyListeners();
        return _allTeams;
      }
    } catch (e) {
      print('Error fetching all teams: $e');
    }
    
    return [];
  }

  // Join a team with no restriction checks - modified for testing
  Future<bool> joinTeam(int teamId) async {
    if (_currentUser == null || _isSyncing) return false;

    // REMOVED: Check if user is already in a team - for testing purposes

    _isSyncing = true;

    try {
      // 1. Update UserMS (update user's teamId)
      final userUrl = Uri.parse('$baseUrlUser/join-team');
      final userResponse = await http.post(
        userUrl,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({
          'email': _currentUser!.email,
          'teamId': teamId,
        }),
      );

      if (userResponse.statusCode != 200 && userResponse.statusCode != 201) {
        print('Failed to update user team: ${userResponse.statusCode} - ${userResponse.body}');
        return false;
      }

      // 2. Update TeamMS (add user to team's userEmails list)
      final teamUrl = Uri.parse('$baseUrlTeam/add-user-to-team');
      final teamResponse = await http.post(
        teamUrl,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({
          'email': _currentUser!.email,
          'teamId': teamId,
        }),
      );

      if (teamResponse.statusCode != 200 && teamResponse.statusCode != 201) {
        print('Failed to add user to team: ${teamResponse.statusCode} - ${teamResponse.body}');
        return false;
      }

      // 3. If both successful, update local data
      await syncUserTeamData(_currentUser!.email);
      return true;
    } catch (e) {
      print('Error joining team: $e');
      return false;
    } finally {
      _isSyncing = false;
    }
  }

  // Leave a team with improved synchronization
  Future<bool> leaveTeam() async {
    if (_currentUser == null || _isSyncing) return false;
    
    // REMOVED: Check if user is in a team - for testing purposes
    // Get current team ID from user data instead
    final userTeamId = await fetchUserTeam(_currentUser!.email);
    if (userTeamId == null) return false;
    
    _isSyncing = true;
    
    try {
      // 1. Remove user from team in TeamMS
      final teamUrl = Uri.parse('$baseUrlTeam/remove-user-from-team/${_currentUser!.email}/$userTeamId');
      final teamResponse = await http.delete(teamUrl);

      if (teamResponse.statusCode != 200) {
        print('Failed to remove user from team: ${teamResponse.statusCode} - ${teamResponse.body}');
      }

      // 2. Update UserMS by setting teamId to null
      final userUrl = Uri.parse('$baseUrlUser/join-team');
      final userResponse = await http.post(
        userUrl,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({
          'email': _currentUser!.email,
          'teamId': null,
        }),
      );

      if (userResponse.statusCode != 200 && userResponse.statusCode != 201) {
        print('Failed to update user record: ${userResponse.statusCode} - ${userResponse.body}');
        return false;
      }

      // 3. Update local data
      _currentTeam = null;
      
      // Refresh all teams to reflect the changes
      await fetchAllTeams();
      
      notifyListeners();
      return true;
    } catch (e) {
      print('Error leaving team: $e');
      return false;
    } finally {
      _isSyncing = false;
    }
  }

  // Check if the current user is in a team
  bool isUserInTeam() {
    return _currentTeam != null;
  }

  // Get team members (emails) for the current team
  List<String> getCurrentTeamMembers() {
    return _currentTeam?.userEmails ?? [];
  }

  // Clear current data (e.g., on logout)
  void clearData() {
    _currentTeam = null;
    _currentUser = null;
    _allTeams = [];
    notifyListeners();
  }
}