public async Task <IActionResult> ApplyDiscount(DiscountApplyInput discountApplyInput)
{
if (!ModelState.IsValid)
{
TempData["discountError"] = ModelState.Values.SelectMany(x => x.Errors).Select(x => x.ErrorMessage).First();
return(RedirectToAction(nameof(Index)));
}
var discountStatus = await _basketService.ApplyDiscount(discountApplyInput.Code);
TempData["discountStatus"] = discountStatus;
return(RedirectToAction(nameof(Index)));
}