import 'package:flutter/cupertino.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:insparkspokalen_ui/models/userModel.dart';
import 'package:insparkspokalen_ui/api_endpoints.dart';
// import 'package:shared_preferences/shared_preferences.dart';

import '../googleAuthService.dart';
import '../image_service.dart';

/// Api docs UserMS
/// https://group-10-15.pvt.dsv.su.se/user/swagger-ui/index.html
class UserService {
  late UserModel user;

  Future<List<UserModel>> showUsers() async {

    try {
      final response = await http.get(ApiEndPoints.userAll);
      if (response.statusCode == 200) {
        final List<dynamic> data = jsonDecode(response.body);
        return data.map((json) => UserModel.fromJson(json)).toList();
      } else {
        return [];
      }
    } catch (e) {
      print("Error fetching users: $e");
      return [];
    }
  }

  Future<void> createOrFetchUser(GoogleSignInAccount account) async {
    String googleEmail = account.email;

    try {
      if (await fetchExistingUser(googleEmail)) { // user exists in backend -> set user, check profile picture and return
        print("User fetched: ${user.toJson()}");
        if (await isDefaultGoogleAvatar(user.profilePicture)) { // if default google profile set random dicebear avatar and update in backend
          await updateProfilePicture(user.email, await ImageService().diceStyleToStorageUrl('avataaars-neutral'));
        }
        GoogleAuthService.setCurrentUser(user); // update locally
        print('UserService DEBUG: googleauthuser = ${GoogleAuthService.getCurrentUser()?.teamId}');
        return;
      }

      // User doesn't exist -> create userModel
      String? profilePicture =
      await (await isDefaultGoogleAvatar(account.photoUrl)
          ? await ImageService().diceStyleToStorageUrl('avataaars-neutral')
          : Future.value(account.photoUrl));

      user = UserModel(
        googleEmail,
        account.displayName ?? 'Unknown',
        profilePicture,
        0,
      );

      if (await createUserBackend(user)) {
        print("User created: ${user.toJson()}");
        GoogleAuthService.setCurrentUser(user);
      } else {
        throw Exception("Failed to create user in backend");
      }

    } catch (e) {
      print("UserService error: $e");
    }
  }

  /// If user exists in backend the method will,
  /// Set this.user to the user from the backend
  /// return true
  Future<bool> fetchExistingUser(String email) async {
    final getUserResponse = await http.get(ApiEndPoints.userGetUserByEmail(email));
    if (getUserResponse.statusCode == 200 && getUserResponse.body.isNotEmpty) {
      user = UserModel.fromJson(jsonDecode(getUserResponse.body));
      print('UserService DEBUG: Fetched user from backend: ${user.toJson()}');
      return true;
    }
    return false;
  }

  Future<bool> createUserBackend(UserModel user) async {
    final getUserResponse = await http.post(
      ApiEndPoints.userCreate,
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode(user.toJson()),
    );
    user = UserModel.fromJson(jsonDecode(getUserResponse.body));
    return getUserResponse.statusCode == 200 || getUserResponse.statusCode == 201;
  }

  static Future<String> getUserRole(String email) async {
    final response = await http.get(ApiEndPoints.userGetRoleByEmail(email));

    if (response.statusCode == 200) {
      return response.body.replaceAll('"', '').toUpperCase();
    } else {
      throw Exception("Failed to retrieve role for $email");
    }
  }

  Future<UserModel> getUserByEmail(String email) async {
    final response = await http.get(ApiEndPoints.userGetUserByEmail(email));

    if (response.statusCode == 200) {
      return UserModel.fromJson(jsonDecode(response.body));
    } else {
      throw Exception('Failed to load user');
    }
  }

  Future<bool> addTeamToUser(int teamId) async {
    user = GoogleAuthService.getCurrentUser()!;

    final response = await http.post(
      ApiEndPoints.userJoinTeam,
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({'email': user?.email, 'teamId': teamId}),
    );

    bool success = response.statusCode == 200 || response.statusCode == 201;

    if (success) {
      user.teamId = teamId;
      GoogleAuthService.setCurrentUser(user);
    }
    return success;
  }

  Future<bool> userResetTeamByEmail(String email) async {

    final response = await http.put(ApiEndPoints.userResetTeamByEmail(email));
    return response.statusCode == 200 || response.statusCode == 201;
  }

  Future<String?> fetchProfilePicture(String email) async {
    final response = await http.get(ApiEndPoints.userGetProfilePictureByEmail(email));

    if (response.statusCode == 200) {
      return response.body.replaceAll('"', '');
    } else {
      return null;
    }
  }

  Future<int?> getUserTeamByEmail(String email) async {
    final response = await http.get(ApiEndPoints.userGetTeamByEmail(email));
    user = UserModel.fromJson(jsonDecode(response.body));
    if (response.statusCode == 200) {
      return user?.teamId;
    } else {
      print('Kunde inte hämta teamId för användare: ${response.statusCode}');
      return 0;
    }
  }

  Future<bool> userInTeam(String email) async {
    final userTeamId = await getUserTeamByEmail(email);
    print('UserService DEBUG: userInTeam: userTeamId = $userTeamId'); // todo remove debug
    final bool userInTeam = userTeamId != 0 && userTeamId != null;
    return userInTeam;
  }

  Future<bool> updateProfilePicture(String email, String imageUrl) async {
    final response = await http.put(
      ApiEndPoints.userChangePictureByEmail(email),
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({
        'imageUrl': imageUrl
      }),
    );

    return response.statusCode == 200;
  }

  static Future<bool> isDefaultGoogleAvatar(String? photoUrl) async {
    if (photoUrl == null || photoUrl.isEmpty) return true;

    try {
      final response = await http.head(Uri.parse(photoUrl));
      final contentType = response.headers['content-type'];
      print('Content type: ${contentType == 'image/png'}');

      return contentType == 'image/png'; // Defaults are PNG
    } catch (e) {
      // Fail safe: assume default if request fails
      return true;
    }
  }
}