Ejemplo n.º 1
0
        private Slide GetInitialSlideForStartup(string courseId, List <Unit> orderedVisibleUnits, bool isInstructor)
        {
            var userId               = User.Identity.GetUserId();
            var lastVisit            = visitsRepo.FindLastVisit(courseId, userId);
            var orderedVisibleSlides = orderedVisibleUnits.SelectMany(u => u.GetSlides(isInstructor)).ToList();

            if (lastVisit != null)
            {
                var lastVisitedSlide = orderedVisibleSlides.FirstOrDefault(s => s.Id == lastVisit.SlideId);
                if (lastVisitedSlide != null)
                {
                    return(lastVisitedSlide);
                }
                if (isInstructor)
                {
                    var instructorNoteSlide = orderedVisibleUnits.FirstOrDefault(u => u.Id == lastVisit.SlideId)?.InstructorNote?.Slide;
                    if (instructorNoteSlide != null)
                    {
                        return(instructorNoteSlide);
                    }
                }
            }

            var unorderedVisitedIds     = visitsRepo.GetIdOfVisitedSlides(courseId, userId);
            var lastVisitedVisibleSlide = orderedVisibleSlides.LastOrDefault(slide => unorderedVisitedIds.Contains(slide.Id));

            if (lastVisitedVisibleSlide != null)
            {
                return(lastVisitedVisibleSlide);
            }
            return(orderedVisibleSlides.Any() ? orderedVisibleSlides.First() : null);
        }