private void RevertMove(VialSet set, Pouring pouring)
{
for (int i = 0; i < pouring.Quantity; i++)
{
set.Vials.ElementAt(pouring.From).Stack(
set.Vials.ElementAt(pouring.To).Pop());
}
}
public VialSet Redo(VialSet set)
{
if (CanRedo)
{
currentIndex++;
ApplyMove(set, _pourings[currentIndex]);
}
return(set);
}
public VialSet Undo(VialSet set)
{
if (CanUndo)
{
RevertMove(set, _pourings[currentIndex]);
currentIndex--;
}
return(set);
}
private VialSet MarkOptions(VialSet set, Vial selected)
{
var color = selected.TopColor;
foreach (var vial in set.Vials)
{
vial.IsOption = !vial.IsSelected && vial.CanPour(color);
}
return(set);
}
private VialSet TryPouring(VialSet set, int indexFrom, int indexTo)
{
var from = set.Vials.ElementAt(indexFrom);
var to = set.Vials.ElementAt(indexTo);
if (from.IsEmpty)
{
return(set);
}
var fromColor = from.TopColor;
while (from.TopColor == fromColor && to.CanPour(fromColor))
{
to.Stack(from.Pop());
from.IsSelected = false;
if (set.LastAppliedPouring == null)
{
set.LastAppliedPouring = new Pouring(indexFrom, indexTo);
}
else
{
set.LastAppliedPouring.Increment();
}
}
if (set.HasChanged)
{
foreach (var vial in set.Vials)
{
vial.IsOption = false;
}
}
return(set);
}
public VialSet Select(VialSet set, int index)
{
set.LastAppliedPouring = null;
var selected = set.Vials.SingleOrDefault(v => v.IsSelected);
if (selected != null)
{
var target = set.Vials.ElementAt(index);
if (target.IsSelected)
{
target.IsSelected = false;
foreach (var vial in set.Vials)
{
vial.IsOption = false;
}
return(set);
}
else
{
return(TryPouring(set,
set.Vials.FirstIndexOf(v => v.IsSelected),
index));
}
}
else
{
var target = set.Vials.ElementAt(index);
if (target.IsEmpty)
{
return(set);
}
target.IsSelected = true;
return(MarkOptions(set, target));
}
}
