Fuzzy rework, added more defence and gather army routines

AI/Nullkiller/Helpers/ArmyFormation.cpp

@@ -0,0 +1,68 @@
+/*
+* ArmyFormation.cpp, part of VCMI engine
+*
+* Authors: listed in file AUTHORS in main folder
+*
+* License: GNU General Public License v2.0 or later
+* Full text of license available in license.txt file, in main folder
+*
+*/
+#include "StdInc.h"
+#include "ArmyFormation.h"
+#include "../../../lib/mapObjects/CGTownInstance.h"
+
+namespace NKAI
+{
+
+void ArmyFormation::rearrangeArmyForSiege(const CGTownInstance * town, const CGHeroInstance * attacker)
+{
+	auto freeSlots = attacker->getFreeSlotsQueue();
+
+	while(!freeSlots.empty())
+	{
+		auto weakestCreature = vstd::minElementByFun(attacker->Slots(), [](const std::pair<SlotID, CStackInstance *> & slot) -> int
+			{
+				return slot.second->getCount() == 1
+					? std::numeric_limits<int>::max()
+					: slot.second->getCreatureID().toCreature()->getAIValue();
+			});
+
+		if(weakestCreature == attacker->Slots().end() || weakestCreature->second->getCount() == 1)
+		{
+			break;
+		}
+
+		cb->splitStack(attacker, attacker, weakestCreature->first, freeSlots.front(), 1);
+		freeSlots.pop();
+	}
+
+	if(town->fortLevel() > CGTownInstance::FORT)
+	{
+		std::vector<CStackInstance *> stacks;
+
+		for(auto slot : attacker->Slots())
+			stacks.push_back(slot.second);
+
+		boost::sort(
+			stacks,
+			[](CStackInstance * slot1, CStackInstance * slot2) -> bool
+			{
+				auto cre1 = slot1->getCreatureID().toCreature();
+				auto cre2 = slot2->getCreatureID().toCreature();
+				auto flying = cre1->hasBonusOfType(BonusType::FLYING) - cre2->hasBonusOfType(BonusType::FLYING);
+			
+				if(flying != 0) return flying < 0;
+				else return cre1->getAIValue() < cre2->getAIValue();
+			});
+
+		for(int i = 0; i < stacks.size(); i++)
+		{
+			auto pos = vstd::findKey(attacker->Slots(), stacks[i]);
+
+			if(pos.getNum() != i)
+				cb->swapCreatures(attacker, attacker, static_cast<SlotID>(i), pos);
+		}
+	}
+}
+
+}