public Result <ImageSlideShow> MoveToRandomImage(ImageSlideShow imageSlideShow)
{
var workingSlideShow = imageSlideShow.Clone();
workingSlideShow.ImageIndex = _randomNumberService.Roll(0, imageSlideShow.ImageList.Count - 1);
return(Result.Ok(workingSlideShow));
}
private Result <ImageSlideShow> MoveSlideShow(ImageSlideShow imageSlideShow, int moveVector)
{
var workingSlideShow = imageSlideShow.Clone();
var newIndex = workingSlideShow.ImageIndex + moveVector;
if (newIndex < 0)
{
return(Result.Fail <ImageSlideShow>("At the start of this slideshow"));
}
if (newIndex == imageSlideShow.ImageList.Count)
{
return(Result.Fail <ImageSlideShow>("At the end of this slideshow"));
}
workingSlideShow.ImageIndex = newIndex;
return(Result.Ok(workingSlideShow));
}
