public async Task UpdateUser()

in src/YouTrackSharp/Management/UserManagementService.cs [109:155]
41 lines of code
8 McCabe index (conditional complexity)

        public async Task UpdateUser(string username, string fullName = null, string email = null, string jabber = null, string password = null)
        {
            if (string.IsNullOrEmpty(username))
            {
                throw new ArgumentNullException(nameof(username));
            }
            
            var client = await _connection.GetAuthenticatedApiClient();
            var users = await client.HubApiUsersGetAsync("login: {" + username + "}", "id,details(id,login)");
            var user = users.Users.FirstOrDefault();

            if (user == null)
            {
                throw new YouTrackErrorException(Strings.Exception_BadRequest, (int)HttpStatusCode.BadRequest,
                    "Could not find user with login " + username,
                    null, null);
            }

            if (!string.IsNullOrEmpty(fullName))
            {
                user.Name = fullName;
            }
            if (!string.IsNullOrEmpty(email))
            {
                user.Profile.Email = new HubApiEmail() {Email = email};
            }
            if (!string.IsNullOrEmpty(jabber))
            {
                user.Profile.Jabber = new HubApiJabber() {Jabber = jabber};
            }
            
            await client.HubUsersPostAsync(user.Id, "id", user);

            if (!string.IsNullOrEmpty(password))
            {
                var detail = user.Details.SingleOrDefault(d => d is EmailuserdetailsJSON);
                if (detail == null)
                {
                    throw new YouTrackErrorException(Strings.Exception_BadRequest, (int)HttpStatusCode.BadRequest,
                        "Could not change password for user " + username + ": no single EmailUserDetails found",
                        null, null);
                }
                
                await client.HubUserdetailsPostAsync(detail.Id, "id",
                    new EmailuserdetailsJSON() {Password = new PlainpasswordJSON() {Value = password}});
            }
        }