public async Task <IActionResult> LoginAsync([FromBody] LoginViewModel userModel)
        {
            if (!ModelState.IsValid)
            {
                return(InvalidModelStateResult(ModelState));
            }

            var result = await _userRepo.LoginAsync(userModel);

            if (result == null)
            {
                return(OKResult(0, "Invalid username or password."));
            }

            return(OKResult(1, "Success", result));
        }