public Trade(MaterialType[] offer, MaterialType[] request, IPlayer owner)
{
if (offer == null)
throw new ArgumentNullException(nameof(offer));
if (request == null)
throw new ArgumentNullException(nameof(request));
if (owner == null)
throw new ArgumentNullException(nameof(owner));
if (!offer.Any() && !request.Any())
throw new ArgumentException("You can't create a trade without at least an offer or a request");
if (offer.Any(m => INVALID_MATERIALS.Contains(m)) || request.Any(m => INVALID_MATERIALS.Contains(m)))
throw new ArgumentException($"Can't create a trade with invalid material resources ({string.Join(", ", INVALID_MATERIALS)})");
if (!owner.HasResources(offer))
throw new InvalidOperationException("Can't offer materials if you don't have them");
Id = Guid.NewGuid();
Offer = offer;
Request = request;
Owner = owner;
State = TradeState.Open;
}