public int Start()
{
bool fightTied = false;
while (ImmuneSystem.Any(g => !g.Removed) && Infection.Any(g => !g.Removed) && !fightTied)
{
var unitCountBeforeRound = GroupsInTargetSelectionOrder.Sum(g => g.Units);
var alreadySelected = new HashSet <int>();
foreach (var group in GroupsInTargetSelectionOrder)
{
var target = group.SelectTarget(alreadySelected);
if (target != null)
{
alreadySelected.Add(target.Id);
}
}
foreach (var group in GroupsInAttackingOrder)
{
group.AttackTarget();
}
fightTied = unitCountBeforeRound == GroupsInTargetSelectionOrder.Sum(g => g.Units);
}
var immuneSystemPoints = ImmuneSystem.Where(g => g.Units >= 0).Sum(g => g.Units);
var infectionPoints = Infection.Where(g => g.Units >= 0).Sum(g => g.Units);
return(Math.Max(immuneSystemPoints, infectionPoints));
}