public async Task <IActionResult> ProgressByCoursePost(int courseId, ChartType chartType)
        {
            var course = await _context.GetCourseById(courseId);

            if (course == null)
            {
                TempData["Message"] = new SystemMessage(MessageType.Warning, "Fant ikke faget.").GetSystemMessage();
                return(RedirectToAction("Time"));
            }
            var chartMaker  = new ChartMaker(_context);
            var currentUser = await _userManager.GetUserAsync(HttpContext.User);

            ViewBag.Courses = await _context.PopulateCourseData(currentUser.Id);

            ViewBag.chartTitle  = chartType.GetDisplayName();
            ViewBag.courseTitle = course.Title;

            switch (chartType)
            {
            case ChartType.Progression:
                ViewBag.Chart = await chartMaker.GenerateCourseChart(course, ChartType.Progression, "Dine arbeidstimer sammenlignet med fagets arbeidsmengde");

                break;

            case ChartType.Workload:
                ViewBag.Chart = await chartMaker.GenerateCourseChart(course, ChartType.Workload, "Gjennomførte og gjenværende arbeidstimer");

                break;
            }

            return(View());
        }