public async Task <IActionResult> ByTag(string variant, string tag)
{
if (Regex.IsMatch(tag, "[^0-9a-zA-Z-]"))
{
return(ViewResultForHttpError(HttpContext, new HttpErrors.NotFound("Invalid tag.")));
}
tag = tag.ToLowerInvariant();
List <Puzzle> puzzles = await puzzleRepository.FindByVariantAndTag(variant, tag) ?? new List <Puzzle>();
if (puzzles.Count == 0)
{
await tagRepository.MaybeRemoveTagAsync(variant, tag);
return(ViewResultForHttpError(HttpContext, new HttpErrors.NotFound("That tag has no puzzles for this variant.")));
}
PuzzleTag tagDetails = await tagRepository.FindTag(variant, tag);
ViewBag.Variant = tagDetails.Variant;
ViewBag.Tag = tagDetails.Name;
ViewBag.Description = tagDetails.Description;
return(View(puzzles.Select(p => p.ID).OrderBy(x => x).ToList()));
}
