public void BuyUpgrade(Upgrade upgrade)
{
foreach (ResourceDelta cost in upgrade.Cost)
{
if (!resources.CanApplyImmediate(cost))
{
throw new Exception(
$"Expected at least {cost.Amount} of {cost.Type}, found only {resources.GetResource(cost.Type).Amount}." +
$"This should not happen, because we should have fastforwarded until there was enough!");
}
resources.ApplyImmediate(cost);
}
boughtUpgrades.Add(upgrade);
boughtUpgradeTimes.Add(CurrentTime);
RecalculateNextCycle();
}