public async Task <PlaceBidResponse> Handle(PlaceBidCommand request, CancellationToken cancellationToken)
{
var item = await _auctionItemRepository.GetAsync(request.ItemId);
if (item == null)
{
throw new ItemNotFoundException(new Exception($"{request.ItemId} not in auction"));
}
if (item.EndTime <= DateTimeOffset.UtcNow)
{
throw new BiddingEndedException(new Exception($"{request.ItemId} bidding ended"));
}
if (item.SellerUserId == request.UserId)
{
throw new SellerCannotBidOnItem(new Exception($"{request.UserId} seller bidding on his item"));
}
if (request.Price < item.Startprice)
{
throw new BidLowerThanStartPriceException(new Exception($"{request.Price} lower than start price {item.Startprice}"));
}
var curBid = await _bidRepository.GetCurrentBidAsync(request.ItemId);
if (curBid != null)
{
if (curBid.Price >= request.Price)
{
throw new BidLowerThanCurrentBidException(new Exception($"{request.Price} lower than current bid"));
}
var increment = request.Price - curBid.Price;
if (increment < item.MinIncrement)
{
throw new BidIncementLessThanMinimumException(new Exception($"{increment} lower than minimum {item.MinIncrement}"));
}
}
var result = await _bidRepository.AddAsync(new Bid()
{
BidDateTime = DateTimeOffset.UtcNow,
ItemId = request.ItemId,
UserId = request.UserId,
Price = request.Price
});
return(new PlaceBidResponse()
{
Id = result.Id
});
}