void OnManipulate()
{
if (holder.HeldId == Virus.Id.Null)
{
var column = VirusFromPosition(pos => pos.X == holder.X).OrderByDescending(v => v.VirusPosition.Y);
if (column.Count() < 1)
{
return;
}
var toTake = column.First();
holder.HeldId = toTake.VirusId;
Change.Invoke(toTake.VirusId, toTake.VirusPosition, Position.Hand());
}
else
{
var toPlace = VirusFromId(holder.HeldId).First();
var end = crowd.Select(v => v.VirusPosition)
.Where(pos => pos.X == holder.X)
.OrderByDescending(pos => pos.Y)
.Select(pos => pos.Y + 1)
.DefaultIfEmpty(1)
.First();
Change.Invoke(toPlace.VirusId, Position.Hand(), Position.OnBoard(holder.X, end));
holder.HeldId = Virus.Id.Null;
}
}
void OnChange(Virus.Id id, Position from, Position to)
{
var changed = VirusFromId(id).First();
changed.VirusPosition = to;
// Pull up
if (1 < to.Y && to.Y < from.Y)
{
Where(to.WithY(to.Y + 1), downer => Change.Invoke(downer.VirusId, downer.VirusPosition, to));
}
// Place
if (1 < to.Y && from == Position.Hand())
{
Where(to.WithY(to.Y - 1), upper => {
if (!(
(upper.VirusGrade == Virus.Grade.Big && changed.VirusGrade == Virus.Grade.Mid) ||
(upper.VirusGrade == Virus.Grade.Mid && changed.VirusGrade == Virus.Grade.Tiny)
))
{
return;
}
Absorb.Invoke(upper.VirusId, changed.VirusId);
});
}
}
void OnMove(int X)
{
holder.X = X;
if (holder.HeldId != Virus.Id.Null)
{
var toPlace = VirusFromId(holder.HeldId).First();
Change.Invoke(toPlace.VirusId, Position.Hand(), Position.Hand());
}
}
