/// <summary>Get the output item.</summary>
public override ITrackedStack?GetOutput()
{
Tree tree = this.Machine;
// recalculate drop queue
var drops = this.ItemDrops.Value;
if (!drops.Any())
{
// seed must be last item dropped, since collecting the seed will reset the stack
int?seedId = TreeMachine.GetSeedForTree(tree);
if (seedId.HasValue)
{
drops.Push(seedId.Value);
}
// get extra drops
foreach (int itemId in this.GetRandomExtraDrops())
{
drops.Push(itemId);
}
}
// get next drop
return(drops.Any()
? new TrackedItem(new SObject(drops.Peek(), 1), onReduced: this.OnOutputReduced)
: null);
}
/*********
** Private methods
*********/
/// <summary>Reset the machine so it's ready to accept a new input.</summary>
/// <param name="item">The output item that was taken.</param>
private void OnOutputReduced(Item item)
{
Tree tree = this.Machine;
if (item.ParentSheetIndex == TreeMachine.GetSeedForTree(tree))
{
tree.hasSeed.Value = false;
}
Stack <int> drops = this.ItemDrops.Value;
if (drops.Any() && drops.Peek() == item.ParentSheetIndex)
{
drops.Pop();
}
}
/// <summary>Get whether a tree can be automated.</summary>
/// <param name="tree">The tree to automate.</param>
public static bool CanAutomate(Tree tree)
{
return(TreeMachine.GetSeedForTree(tree) != null);
}