public JsonResult ToggleTimeTracking([FromBody] TimeTrackingViewModel vm)
        {
            if (ModelState.IsValid)
            {
                TimeTracking runningTimeTracking = _repository.GetRunningTimeTracking(User.Identity.Name);
                TimeTracking newTimeTracking;

                if (runningTimeTracking == null)
                {

                    if (vm.TaskId != 0)
                    {
                        newTimeTracking = new TimeTracking
                        {
                            UserName = User.Identity.Name,
                            Task = _repository.GetTaskById(vm.TaskId, User.Identity.Name),
                            StartTime = DateTime.UtcNow
                        };
                    } else if (vm.Description != null)
                    {
                        newTimeTracking = new TimeTracking
                        {
                            UserName = User.Identity.Name,
                            Description = vm.Description,
                            StartTime = DateTime.UtcNow
                        };
                    } else
                    {
                        newTimeTracking = new TimeTracking
                        {
                            UserName = User.Identity.Name,
                            StartTime = DateTime.UtcNow
                        };
                    }

                    TimeTracking saved = _repository.AddTimeTrackingEntry(newTimeTracking);

                    if (_repository.SaveAll())
                    {
                        return Json(Mapper.Map<TimeTrackingViewModel>(_repository.GetTimeTrackingById(saved.Id, User.Identity.Name)));
                    }
                    else
                    {
                        Response.StatusCode = (int)HttpStatusCode.BadRequest;
                        return Json(new { error = "Starting a new timetracking entry failed." });
                    }
                }
                else
                {
                    TimeTracking original = _repository.GetTimeTrackingById(runningTimeTracking.Id, User.Identity.Name);
                    original.EndTime = DateTime.UtcNow;

                    // User wants to just stop time
                    if (runningTimeTracking.Id == vm.Id)
                    {
                        if (_repository.SaveAll())
                        {
                            return Json(Mapper.Map<TimeTrackingViewModel>(original));
                        }
                        else
                        {
                            Response.StatusCode = (int)HttpStatusCode.BadRequest;
                            return Json(new { error = "Stopping an existing timetracking entry failed." });
                        }
                    } else // User has started new time tracking, stop old one and start new
                    {
                        if (vm.TaskId != 0)
                        {
                            newTimeTracking = new TimeTracking
                            {
                                UserName = User.Identity.Name,
                                Task = _repository.GetTaskById(vm.TaskId, User.Identity.Name),
                                StartTime = DateTime.UtcNow
                            };
                        }
                        else if (vm.Description != null)
                        {
                            newTimeTracking = new TimeTracking
                            {
                                UserName = User.Identity.Name,
                                Description = vm.Description,
                                StartTime = DateTime.UtcNow
                            };
                        }
                        else
                        {
                            newTimeTracking = new TimeTracking
                            {
                                UserName = User.Identity.Name,
                                StartTime = DateTime.UtcNow
                            };
                        }

                        TimeTracking saved = _repository.AddTimeTrackingEntry(newTimeTracking);

                        if (_repository.SaveAll())
                        {
                            return Json(Mapper.Map<TimeTrackingViewModel>(_repository.GetTimeTrackingById(saved.Id, User.Identity.Name)));
                        }
                        else
                        {
                            Response.StatusCode = (int)HttpStatusCode.BadRequest;
                            return Json(new { error = "Stopping old and starting a new timetracking entry failed." });
                        }
                    }


                }
            }
            else
            {
                Response.StatusCode = (int)HttpStatusCode.BadRequest;
                return Json(new { error = "Viewmodel was not valid." });
            }
        }
 /* Timetracking */
 public TimeTracking AddTimeTrackingEntry(TimeTracking timeTracking)
 {
     return _context.TimeTracking.Add(timeTracking).Entity;
 }