vcmi/AI/VCAI/VCAI.cpp

/*
 * VCAI.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 "VCAI.h"
#include "Fuzzy.h"

#include "../../lib/UnlockGuard.h"
#include "../../lib/mapObjects/MapObjects.h"
#include "../../lib/CConfigHandler.h"
#include "../../lib/CHeroHandler.h"
#include "../../lib/CModHandler.h"
#include "../../lib/CGameState.h"
#include "../../lib/NetPacks.h"
#include "../../lib/serializer/CTypeList.h"
#include "../../lib/serializer/BinarySerializer.h"
#include "../../lib/serializer/BinaryDeserializer.h"

extern FuzzyHelper * fh;

class CGVisitableOPW;

const double SAFE_ATTACK_CONSTANT = 1.5;
const int GOLD_RESERVE = 10000; //when buying creatures we want to keep at least this much gold (10000 so at least we'll be able to reach capitol)

//one thread may be turn of AI and another will be handling a side effect for AI2
boost::thread_specific_ptr<CCallback> cb;
boost::thread_specific_ptr<VCAI> ai;

//std::map<int, std::map<int, int> > HeroView::infosCount;

//helper RAII to manage global ai/cb ptrs
struct SetGlobalState
{
	SetGlobalState(VCAI * AI)
	{
		assert(!ai.get());
		assert(!cb.get());

		ai.reset(AI);
		cb.reset(AI->myCb.get());
	}
	~SetGlobalState()
	{
		ai.release();
		cb.release();
	}
};


#define SET_GLOBAL_STATE(ai) SetGlobalState _hlpSetState(ai);

#define NET_EVENT_HANDLER SET_GLOBAL_STATE(this)
#define MAKING_TURN SET_GLOBAL_STATE(this)

void foreach_tile(std::vector<std::vector<std::vector<unsigned char>>> & vectors, std::function<void(unsigned char & in)> foo)
{
	for(auto & vector : vectors)
	{
		for(auto j = vector.begin(); j != vector.end(); j++)
		{
			for(auto & elem : *j)
				foo(elem);
		}
	}
}

struct ObjInfo
{
	int3 pos;
	std::string name;
	ObjInfo(){}
	ObjInfo(const CGObjectInstance * obj)
		: pos(obj->pos), name(obj->getObjectName())
	{
	}
};

std::map<const CGObjectInstance *, ObjInfo> helperObjInfo;

VCAI::VCAI()
{
	LOG_TRACE(logAi);
	makingTurn = nullptr;
	destinationTeleport = ObjectInstanceID();
	destinationTeleportPos = int3(-1);
}

VCAI::~VCAI()
{
	LOG_TRACE(logAi);
	finish();
}

void VCAI::availableCreaturesChanged(const CGDwelling * town)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::heroMoved(const TryMoveHero & details)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;

	validateObject(details.id); //enemy hero may have left visible area
	auto hero = cb->getHero(details.id);
	cachedSectorMaps.clear();

	const int3 from = CGHeroInstance::convertPosition(details.start, false);
	const int3 to = CGHeroInstance::convertPosition(details.end, false);
	const CGObjectInstance * o1 = vstd::frontOrNull(cb->getVisitableObjs(from));
	const CGObjectInstance * o2 = vstd::frontOrNull(cb->getVisitableObjs(to));

	if(details.result == TryMoveHero::TELEPORTATION)
	{
		auto t1 = dynamic_cast<const CGTeleport *>(o1);
		auto t2 = dynamic_cast<const CGTeleport *>(o2);
		if(t1 && t2)
		{
			if(cb->isTeleportChannelBidirectional(t1->channel))
			{
				if(o1->ID == Obj::SUBTERRANEAN_GATE && o1->ID == o2->ID) // We need to only add subterranean gates in knownSubterraneanGates. Used for features not yet ported to use teleport channels
				{
					knownSubterraneanGates[o1] = o2;
					knownSubterraneanGates[o2] = o1;
					logAi->debug("Found a pair of subterranean gates between %s and %s!", from.toString(), to.toString());
				}
			}
		}
		//FIXME: teleports are not correctly visited
		unreserveObject(hero, t1);
		unreserveObject(hero, t2);
	}
	else if(details.result == TryMoveHero::EMBARK && hero)
	{
		//make sure AI not attempt to visit used boat
		validateObject(hero->boat);
	}
	else if(details.result == TryMoveHero::DISEMBARK && o1)
	{
		auto boat = dynamic_cast<const CGBoat *>(o1);
		if(boat)
			addVisitableObj(boat);
	}
}

void VCAI::heroInGarrisonChange(const CGTownInstance * town)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::centerView(int3 pos, int focusTime)
{
	LOG_TRACE_PARAMS(logAi, "focusTime '%i'", focusTime);
	NET_EVENT_HANDLER;
}

void VCAI::artifactMoved(const ArtifactLocation & src, const ArtifactLocation & dst)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::artifactAssembled(const ArtifactLocation & al)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::showTavernWindow(const CGObjectInstance * townOrTavern)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::showThievesGuildWindow(const CGObjectInstance * obj)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::playerBlocked(int reason, bool start)
{
	LOG_TRACE_PARAMS(logAi, "reason '%i', start '%i'", reason % start);
	NET_EVENT_HANDLER;
	if(start && reason == PlayerBlocked::UPCOMING_BATTLE)
		status.setBattle(UPCOMING_BATTLE);

	if(reason == PlayerBlocked::ONGOING_MOVEMENT)
		status.setMove(start);
}

void VCAI::showPuzzleMap()
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::showShipyardDialog(const IShipyard * obj)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::gameOver(PlayerColor player, const EVictoryLossCheckResult & victoryLossCheckResult)
{
	LOG_TRACE_PARAMS(logAi, "victoryLossCheckResult '%s'", victoryLossCheckResult.messageToSelf);
	NET_EVENT_HANDLER;
	logAi->debug("Player %d (%s): I heard that player %d (%s) %s.", playerID, playerID.getStr(), player, player.getStr(), (victoryLossCheckResult.victory() ? "won" : "lost"));
	if(player == playerID)
	{
		if(victoryLossCheckResult.victory())
		{
			logAi->debug("VCAI: I won! Incredible!");
			logAi->debug("Turn nr %d", myCb->getDate());
		}
		else
		{
			logAi->debug("VCAI: Player %d (%s) lost. It's me. What a disappointment! :(", player, player.getStr());
		}

		finish();
	}
}

void VCAI::artifactPut(const ArtifactLocation & al)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::artifactRemoved(const ArtifactLocation & al)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::artifactDisassembled(const ArtifactLocation & al)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::heroVisit(const CGHeroInstance * visitor, const CGObjectInstance * visitedObj, bool start)
{
	LOG_TRACE_PARAMS(logAi, "start '%i'; obj '%s'", start % (visitedObj ? visitedObj->getObjectName() : std::string("n/a")));
	NET_EVENT_HANDLER;

	if(start && visitedObj) //we can end visit with null object, anyway
	{
		markObjectVisited(visitedObj);
		unreserveObject(visitor, visitedObj);
		completeGoal(sptr(Goals::GetObj(visitedObj->id.getNum()).sethero(visitor))); //we don't need to visit it anymore
		//TODO: what if we visited one-time visitable object that was reserved by another hero (shouldn't, but..)
	}

	status.heroVisit(visitedObj, start);
}

void VCAI::availableArtifactsChanged(const CGBlackMarket * bm)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::heroVisitsTown(const CGHeroInstance * hero, const CGTownInstance * town)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	//buildArmyIn(town);
	//moveCreaturesToHero(town);
}

void VCAI::tileHidden(const std::unordered_set<int3, ShashInt3> & pos)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;

	validateVisitableObjs();
	clearPathsInfo();
}

void VCAI::tileRevealed(const std::unordered_set<int3, ShashInt3> & pos)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	for(int3 tile : pos)
	{
		for(const CGObjectInstance * obj : myCb->getVisitableObjs(tile))
			addVisitableObj(obj);
	}

	clearPathsInfo();
}

void VCAI::heroExchangeStarted(ObjectInstanceID hero1, ObjectInstanceID hero2, QueryID query)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;

	auto firstHero = cb->getHero(hero1);
	auto secondHero = cb->getHero(hero2);

	status.addQuery(query, boost::str(boost::format("Exchange between heroes %s (%d) and %s (%d)") % firstHero->name % firstHero->tempOwner % secondHero->name % secondHero->tempOwner));

	requestActionASAP([=]()
	{
		float goalpriority1 = 0, goalpriority2 = 0;

		auto firstGoal = getGoal(firstHero);
		if(firstGoal->goalType == Goals::GATHER_ARMY)
			goalpriority1 = firstGoal->priority;
		auto secondGoal = getGoal(secondHero);
		if(secondGoal->goalType == Goals::GATHER_ARMY)
			goalpriority2 = secondGoal->priority;

		auto transferFrom2to1 = [this](const CGHeroInstance * h1, const CGHeroInstance * h2) -> void
		{
			this->pickBestCreatures(h1, h2);
			this->pickBestArtifacts(h1, h2);
		};

		//Do not attempt army or artifacts exchange if we visited ally player
		//Visits can still be useful if hero have skills like Scholar
		if(firstHero->tempOwner != secondHero->tempOwner)
		{
			logAi->debug("Heroes owned by different players. Do not exchange army or artifacts.");
		}
		else if(goalpriority1 > goalpriority2)
		{
			transferFrom2to1(firstHero, secondHero);
		}
		else if(goalpriority1 < goalpriority2)
		{
			transferFrom2to1(secondHero, firstHero);
		}
		else //regular criteria
		{
			if(firstHero->getFightingStrength() > secondHero->getFightingStrength() && canGetArmy(firstHero, secondHero))
				transferFrom2to1(firstHero, secondHero);
			else if(canGetArmy(secondHero, firstHero))
				transferFrom2to1(secondHero, firstHero);
		}

		completeGoal(sptr(Goals::VisitHero(firstHero->id.getNum()))); //TODO: what if we were visited by other hero in the meantime?
		completeGoal(sptr(Goals::VisitHero(secondHero->id.getNum())));

		answerQuery(query, 0);
	});
}

void VCAI::heroPrimarySkillChanged(const CGHeroInstance * hero, int which, si64 val)
{
	LOG_TRACE_PARAMS(logAi, "which '%i', val '%i'", which % val);
	NET_EVENT_HANDLER;
}

void VCAI::showRecruitmentDialog(const CGDwelling * dwelling, const CArmedInstance * dst, int level)
{
	LOG_TRACE_PARAMS(logAi, "level '%i'", level);
	NET_EVENT_HANDLER;
}

void VCAI::heroMovePointsChanged(const CGHeroInstance * hero)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::garrisonsChanged(ObjectInstanceID id1, ObjectInstanceID id2)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::newObject(const CGObjectInstance * obj)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	if(obj->isVisitable())
		addVisitableObj(obj);

	cachedSectorMaps.clear();
}

void VCAI::objectRemoved(const CGObjectInstance * obj)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;

	vstd::erase_if_present(visitableObjs, obj);
	vstd::erase_if_present(alreadyVisited, obj);

	for(auto h : cb->getHeroesInfo())
		unreserveObject(h, obj);

	//TODO: Find better way to handle hero boat removal
	if(auto hero = dynamic_cast<const CGHeroInstance *>(obj))
	{
		if(hero->boat)
		{
			vstd::erase_if_present(visitableObjs, hero->boat);
			vstd::erase_if_present(alreadyVisited, hero->boat);

			for(auto h : cb->getHeroesInfo())
				unreserveObject(h, hero->boat);
		}
	}

	cachedSectorMaps.clear(); //invalidate all paths

	//TODO
	//there are other places where CGObjectinstance ptrs are stored...
	//

	if(obj->ID == Obj::HERO && obj->tempOwner == playerID)
	{
		lostHero(cb->getHero(obj->id)); //we can promote, since objectRemoved is called just before actual deletion
	}
}

void VCAI::showHillFortWindow(const CGObjectInstance * object, const CGHeroInstance * visitor)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;

	requestActionASAP([=]()
	{
		makePossibleUpgrades(visitor);
	});
}

void VCAI::playerBonusChanged(const Bonus & bonus, bool gain)
{
	LOG_TRACE_PARAMS(logAi, "gain '%i'", gain);
	NET_EVENT_HANDLER;
}

void VCAI::heroCreated(const CGHeroInstance * h)
{
	LOG_TRACE(logAi);
	if(h->visitedTown)
		townVisitsThisWeek[HeroPtr(h)].insert(h->visitedTown);
	NET_EVENT_HANDLER;
}

void VCAI::advmapSpellCast(const CGHeroInstance * caster, int spellID)
{
	LOG_TRACE_PARAMS(logAi, "spellID '%i", spellID);
	NET_EVENT_HANDLER;
}

void VCAI::showInfoDialog(const std::string & text, const std::vector<Component> & components, int soundID)
{
	LOG_TRACE_PARAMS(logAi, "soundID '%i'", soundID);
	NET_EVENT_HANDLER;
}

void VCAI::requestRealized(PackageApplied * pa)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	if(status.haveTurn())
	{
		if(pa->packType == typeList.getTypeID<EndTurn>())
		{
			if(pa->result)
				status.madeTurn();
		}
	}

	if(pa->packType == typeList.getTypeID<QueryReply>())
	{
		status.receivedAnswerConfirmation(pa->requestID, pa->result);
	}
}

void VCAI::receivedResource()
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::showUniversityWindow(const IMarket * market, const CGHeroInstance * visitor)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::heroManaPointsChanged(const CGHeroInstance * hero)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::heroSecondarySkillChanged(const CGHeroInstance * hero, int which, int val)
{
	LOG_TRACE_PARAMS(logAi, "which '%d', val '%d'", which % val);
	NET_EVENT_HANDLER;
}

void VCAI::battleResultsApplied()
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	assert(status.getBattle() == ENDING_BATTLE);
	status.setBattle(NO_BATTLE);
}

void VCAI::objectPropertyChanged(const SetObjectProperty * sop)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	if(sop->what == ObjProperty::OWNER)
	{
		if(myCb->getPlayerRelations(playerID, (PlayerColor)sop->val) == PlayerRelations::ENEMIES)
		{
			//we want to visit objects owned by oppponents
			auto obj = myCb->getObj(sop->id, false);
			if(obj)
			{
				addVisitableObj(obj); // TODO: Remove once save compatability broken. In past owned objects were removed from this set
				vstd::erase_if_present(alreadyVisited, obj);
			}
		}
	}
}

void VCAI::buildChanged(const CGTownInstance * town, BuildingID buildingID, int what)
{
	LOG_TRACE_PARAMS(logAi, "what '%i'", what);
	NET_EVENT_HANDLER;
}

void VCAI::heroBonusChanged(const CGHeroInstance * hero, const Bonus & bonus, bool gain)
{
	LOG_TRACE_PARAMS(logAi, "gain '%i'", gain);
	NET_EVENT_HANDLER;
}

void VCAI::showMarketWindow(const IMarket * market, const CGHeroInstance * visitor)
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::showWorldViewEx(const std::vector<ObjectPosInfo> & objectPositions)
{
	//TODO: AI support for ViewXXX spell
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
}

void VCAI::init(std::shared_ptr<CCallback> CB)
{
	LOG_TRACE(logAi);
	myCb = CB;
	cbc = CB;
	NET_EVENT_HANDLER;
	playerID = *myCb->getMyColor();
	myCb->waitTillRealize = true;
	myCb->unlockGsWhenWaiting = true;

	if(!fh)
		fh = new FuzzyHelper();

	retrieveVisitableObjs();
}

void VCAI::yourTurn()
{
	LOG_TRACE(logAi);
	NET_EVENT_HANDLER;
	status.startedTurn();
	makingTurn = make_unique<boost::thread>(&VCAI::makeTurn, this);
}

void VCAI::heroGotLevel(const CGHeroInstance * hero, PrimarySkill::PrimarySkill pskill, std::vector<SecondarySkill> & skills, QueryID queryID)
{
	LOG_TRACE_PARAMS(logAi, "queryID '%i'", queryID);
	NET_EVENT_HANDLER;
	status.addQuery(queryID, boost::str(boost::format("Hero %s got level %d") % hero->name % hero->level));
	requestActionASAP([=](){ answerQuery(queryID, 0); });
}

void VCAI::commanderGotLevel(const CCommanderInstance * commander, std::vector<ui32> skills, QueryID queryID)
{
	LOG_TRACE_PARAMS(logAi, "queryID '%i'", queryID);
	NET_EVENT_HANDLER;
	status.addQuery(queryID, boost::str(boost::format("Commander %s of %s got level %d") % commander->name % commander->armyObj->nodeName() % (int)commander->level));
	requestActionASAP([=](){ answerQuery(queryID, 0); });
}

void VCAI::showBlockingDialog(const std::string & text, const std::vector<Component> & components, QueryID askID, const int soundID, bool selection, bool cancel)
{
	LOG_TRACE_PARAMS(logAi, "text '%s', askID '%i', soundID '%i', selection '%i', cancel '%i'", text % askID % soundID % selection % cancel);
	NET_EVENT_HANDLER;
	int sel = 0;
	status.addQuery(askID, boost::str(boost::format("Blocking dialog query with %d components - %s")
									  % components.size() % text));

	if(selection) //select from multiple components -> take the last one (they're indexed [1-size])
		sel = components.size();

	if(!selection && cancel) //yes&no -> always answer yes, we are a brave AI :)
		sel = 1;

	requestActionASAP([=]()
	{
		answerQuery(askID, sel);
	});
}

void VCAI::showTeleportDialog(TeleportChannelID channel, TTeleportExitsList exits, bool impassable, QueryID askID)
{
//	LOG_TRACE_PARAMS(logAi, "askID '%i', exits '%s'", askID % exits);
	NET_EVENT_HANDLER;
	status.addQuery(askID, boost::str(boost::format("Teleport dialog query with %d exits")
																			% exits.size()));

	int choosenExit = -1;
	if(impassable)
	{
		knownTeleportChannels[channel]->passability = TeleportChannel::IMPASSABLE;
	}
	else if(destinationTeleport != ObjectInstanceID() && destinationTeleportPos.valid())
	{
		auto neededExit = std::make_pair(destinationTeleport, destinationTeleportPos);
		if(destinationTeleport != ObjectInstanceID() && vstd::contains(exits, neededExit))
			choosenExit = vstd::find_pos(exits, neededExit);
	}

	for(auto exit : exits)
	{
		if(status.channelProbing() && exit.first == destinationTeleport)
		{
			choosenExit = vstd::find_pos(exits, exit);
			break;
		}
		else
		{
			// TODO: Implement checking if visiting that teleport will uncovert any FoW
			// So far this is the best option to handle decision about probing
			auto obj = cb->getObj(exit.first, false);
			if(obj == nullptr && !vstd::contains(teleportChannelProbingList, exit.first))
			{
				if(exit.first != destinationTeleport)
					teleportChannelProbingList.push_back(exit.first);
			}
		}
	}

	requestActionASAP([=]()
	{
		answerQuery(askID, choosenExit);
	});
}

void VCAI::showGarrisonDialog(const CArmedInstance * up, const CGHeroInstance * down, bool removableUnits, QueryID queryID)
{
	LOG_TRACE_PARAMS(logAi, "removableUnits '%i', queryID '%i'", removableUnits % queryID);
	NET_EVENT_HANDLER;

	std::string s1 = up ? up->nodeName() : "NONE";
	std::string s2 = down ? down->nodeName() : "NONE";

	status.addQuery(queryID, boost::str(boost::format("Garrison dialog with %s and %s") % s1 % s2));

	//you can't request action from action-response thread
	requestActionASAP([=]()
	{
		if(removableUnits)
			pickBestCreatures(down, up);

		answerQuery(queryID, 0);
	});
}

void VCAI::showMapObjectSelectDialog(QueryID askID, const Component & icon, const MetaString & title, const MetaString & description, const std::vector<ObjectInstanceID> & objects)
{
	status.addQuery(askID, "Map object select query");
	requestActionASAP([=](){ answerQuery(askID, 0); });

	//TODO: Town portal destination selection goes here
}

void VCAI::saveGame(BinarySerializer & h, const int version)
{
	LOG_TRACE_PARAMS(logAi, "version '%i'", version);
	NET_EVENT_HANDLER;
	validateVisitableObjs();

	#if 0
	//disabled due to issue 2890
	registerGoals(h);
	#endif // 0
	CAdventureAI::saveGame(h, version);
	serializeInternal(h, version);
}

void VCAI::loadGame(BinaryDeserializer & h, const int version)
{
	LOG_TRACE_PARAMS(logAi, "version '%i'", version);
	NET_EVENT_HANDLER;

	#if 0
	//disabled due to issue 2890
	registerGoals(h);
	#endif // 0
	CAdventureAI::loadGame(h, version);
	serializeInternal(h, version);
}

void makePossibleUpgrades(const CArmedInstance * obj)
{
	if(!obj)
		return;

	for(int i = 0; i < GameConstants::ARMY_SIZE; i++)
	{
		if(const CStackInstance * s = obj->getStackPtr(SlotID(i)))
		{
			UpgradeInfo ui;
			cb->getUpgradeInfo(obj, SlotID(i), ui);
			if(ui.oldID >= 0 && cb->getResourceAmount().canAfford(ui.cost[0] * s->count))
			{
				cb->upgradeCreature(obj, SlotID(i), ui.newID[0]);
			}
		}
	}
}

void VCAI::makeTurn()
{
	logGlobal->info("Player %d (%s) starting turn", playerID, playerID.getStr());

	MAKING_TURN;
	boost::shared_lock<boost::shared_mutex> gsLock(CGameState::mutex);
	setThreadName("VCAI::makeTurn");

	switch(cb->getDate(Date::DAY_OF_WEEK))
	{
	case 1:
	{
		townVisitsThisWeek.clear();
		std::vector<const CGObjectInstance *> objs;
		retrieveVisitableObjs(objs, true);
		for(const CGObjectInstance * obj : objs)
		{
			if(isWeeklyRevisitable(obj))
			{
				addVisitableObj(obj);
				vstd::erase_if_present(alreadyVisited, obj);
			}
		}
		break;
	}
	}
	markHeroAbleToExplore(primaryHero());

	makeTurnInternal();
}
/*This method defines core of AI behavior. It is not consistent system, just "a bit of everything for everyone" done in some example order.
 It is not supposed to work this way in final version of VCAI. It consists of few actions/loops done in particular order, hard parts are explained below with focus on explaining hero management logic*/
void VCAI::makeTurnInternal()
{
	saving = 0;

	//it looks messy here, but it's better to have armed heroes before attempting realizing goals
	for(const CGTownInstance * t : cb->getTownsInfo())
		moveCreaturesToHero(t);

	try
	{
		/*Below loop causes heroes with objects locked to them to keep trying to realize previous goal. By design when object is locked another heroes do not attempt to visit it.
		Object lock happens on turn when some hero gets assigned visit tile with appropiate map object. So basically all heroes that had VisitTile goal with object assigned and not completed
		will be in the loop. Sometimes heroes get assigned more important objectives, but still keep reserved objects for later. There is a problem with that - they have
		reserved objects in the list, so they fall to this loop at start of turn and visiting object isn't delayed. Comments for that function are supposed to help newer VCAI maintainers*/

		//Pick objects reserved in previous turn - we expect only nearby objects there
		auto reservedHeroesCopy = reservedHeroesMap; //work on copy => the map may be changed while iterating (eg because hero died when attempting a goal)
		for(auto hero : reservedHeroesCopy)
		{
			if(reservedHeroesMap.count(hero.first))
				continue; //hero might have been removed while we were in this loop
			if(!hero.first.validAndSet())
			{
				logAi->error("Hero %s present on reserved map. Shouldn't be.", hero.first.name);
				continue;
			}

			std::vector<const CGObjectInstance *> vec(hero.second.begin(), hero.second.end());
			boost::sort(vec, CDistanceSorter(hero.first.get()));
			for(auto obj : vec)
			{
				if(!obj || !cb->getObj(obj->id))
				{
					logAi->error("Error: there is wrong object on list for hero %s", hero.first->name);
					continue;
				}
				striveToGoal(sptr(Goals::VisitTile(obj->visitablePos()).sethero(hero.first)));
			}
		}

		//now try to win
		/*below line performs goal decomposition, result of the function is ONE goal for ONE hero to realize.*/
		striveToGoal(sptr(Goals::Win()));

		/*Explanation of below loop: At the time of writing this - goals get decomposited either to GatherArmy or Visit Tile.
		Visit tile that is about visiting object gets processed at beginning of MakeTurnInternal without re-evaluation.
		Rest of goals that got started via striveToGoal(sptr(Goals::Win())); in previous turns and not finished get continued here.
		Also they are subject for re-evaluation to see if there is better goal to start (still talking only about heroes that got goals started by via striveToGoal(sptr(Goals::Win())); in previous turns.*/

		//finally, continue our abstract long-term goals
		int oldMovement = 0;
		int newMovement = 0;
		while(true)
		{
			oldMovement = newMovement; //remember old value
			newMovement = 0;
			std::vector<std::pair<HeroPtr, Goals::TSubgoal>> safeCopy;
			for(auto mission : lockedHeroes)
			{
				fh->setPriority(mission.second); //re-evaluate
				if(canAct(mission.first))
				{
					newMovement += mission.first->movement;
					safeCopy.push_back(mission);
				}
			}
			if(newMovement == oldMovement) //means our heroes didn't move or didn't re-assign their goals
			{
				logAi->warn("Our heroes don't move anymore, exhaustive decomposition failed");
				break;
			}
			if(safeCopy.empty())
			{
				break; //all heroes exhausted their locked goals
			}
			else
			{
				typedef std::pair<HeroPtr, Goals::TSubgoal> TItrType;

				auto lockedHeroesSorter = [](TItrType m1, TItrType m2) -> bool
				{
					return m1.second->priority < m2.second->priority;
				};
				striveToGoal(boost::max_element(safeCopy, lockedHeroesSorter)->second);
			}
		}

		auto quests = myCb->getMyQuests();
		for(auto quest : quests)
		{
			striveToQuest(quest);
		}

		striveToGoal(sptr(Goals::Build())); //TODO: smarter building management

		/*Below function is also responsible for hero movement via internal wander function. By design it is separate logic for heroes that have nothing to do.
		Heroes that were not picked by striveToGoal(sptr(Goals::Win())); recently (so they do not have new goals and cannot continue/reevaluate previously locked goals) will do logic in wander().*/
		performTypicalActions();

		//for debug purpose
		for(auto h : cb->getHeroesInfo())
		{
			if(h->movement)
				logAi->warn("Hero %s has %d MP left", h->name, h->movement);
		}
	}
	catch(boost::thread_interrupted & e)
	{
		logAi->debug("Making turn thread has been interrupted. We'll end without calling endTurn.");
		return;
	}
	catch(std::exception & e)
	{
		logAi->debug("Making turn thread has caught an exception: %s", e.what());
	}

	endTurn();
}

bool VCAI::goVisitObj(const CGObjectInstance * obj, HeroPtr h)
{
	int3 dst = obj->visitablePos();
	auto sm = getCachedSectorMap(h);
	logAi->debug("%s will try to visit %s at (%s)", h->name, obj->getObjectName(), dst.toString());
	int3 pos = sm->firstTileToGet(h, dst);
	if(!pos.valid()) //rare case when we are already standing on one of potential objects
		return false;
	return moveHeroToTile(pos, h);
}

void VCAI::performObjectInteraction(const CGObjectInstance * obj, HeroPtr h)
{
	LOG_TRACE_PARAMS(logAi, "Hero %s and object %s at %s", h->name % obj->getObjectName() % obj->pos.toString());
	switch(obj->ID)
	{
	case Obj::CREATURE_GENERATOR1:
		recruitCreatures(dynamic_cast<const CGDwelling *>(obj), h.get());
		checkHeroArmy(h);
		break;
	case Obj::TOWN:
		moveCreaturesToHero(dynamic_cast<const CGTownInstance *>(obj));
		if(h->visitedTown) //we are inside, not just attacking
		{
			townVisitsThisWeek[h].insert(h->visitedTown);
			if(!h->hasSpellbook() && cb->getResourceAmount(Res::GOLD) >= GameConstants::SPELLBOOK_GOLD_COST + saving[Res::GOLD])
			{
				if(h->visitedTown->hasBuilt(BuildingID::MAGES_GUILD_1))
					cb->buyArtifact(h.get(), ArtifactID::SPELLBOOK);
			}
		}
		break;
	}
	completeGoal(sptr(Goals::GetObj(obj->id.getNum()).sethero(h)));
}

void VCAI::moveCreaturesToHero(const CGTownInstance * t)
{
	if(t->visitingHero && t->armedGarrison() && t->visitingHero->tempOwner == t->tempOwner)
	{
		pickBestCreatures(t->visitingHero, t);
	}
}

bool VCAI::canGetArmy(const CGHeroInstance * army, const CGHeroInstance * source)
{
	//TODO: merge with pickBestCreatures
	//if (ai->primaryHero().h == source)
	if(army->tempOwner != source->tempOwner)
	{
		logAi->error("Why are we even considering exchange between heroes from different players?");
		return false;
	}

	const CArmedInstance * armies[] = {army, source};

	//we calculate total strength for each creature type available in armies
	std::map<const CCreature *, int> creToPower;
	for(auto armyPtr : armies)
	{
		for(auto & i : armyPtr->Slots())
		{
			//TODO: allow splitting stacks?
			creToPower[i.second->type] += i.second->getPower();
		}
	}
	//TODO - consider more than just power (ie morale penalty, hero specialty in certain stacks, etc)
	int armySize = creToPower.size();
	armySize = std::min((source->needsLastStack() ? armySize - 1 : armySize), GameConstants::ARMY_SIZE); //can't move away last stack
	std::vector<const CCreature *> bestArmy; //types that'll be in final dst army
	for(int i = 0; i < armySize; i++) //pick the creatures from which we can get most power, as many as dest can fit
	{
		typedef const std::pair<const CCreature *, int> & CrePowerPair;
		auto creIt = boost::max_element(creToPower, [](CrePowerPair lhs, CrePowerPair rhs)
		{
			return lhs.second < rhs.second;
		});
		bestArmy.push_back(creIt->first);
		creToPower.erase(creIt);
		if(creToPower.empty())
			break;
	}

	//foreach best type -> iterate over slots in both armies and if it's the appropriate type, send it to the slot where it belongs
	for(int i = 0; i < bestArmy.size(); i++) //i-th strongest creature type will go to i-th slot
	{
		for(auto armyPtr : armies)
		{
			for(int j = 0; j < GameConstants::ARMY_SIZE; j++)
			{
				if(armyPtr->getCreature(SlotID(j)) == bestArmy[i] && armyPtr != army) //it's a searched creature not in dst ARMY
				{
					//FIXME: line below is useless when simulating exchange between two non-singular armies
					if(!(armyPtr->needsLastStack() && armyPtr->stacksCount() == 1)) //can't take away last creature
						return true; //at least one exchange will be performed
					else
						return false; //no further exchange possible
				}
			}
		}
	}
	return false;
}

void VCAI::pickBestCreatures(const CArmedInstance * army, const CArmedInstance * source)
{
	//TODO - what if source is a hero (the last stack problem) -> it'd good to create a single stack of weakest cre
	const CArmedInstance * armies[] = {army, source};

	//we calculate total strength for each creature type available in armies
	std::map<const CCreature *, int> creToPower;
	for(auto armyPtr : armies)
	{
		for(auto & i : armyPtr->Slots())
		{
			//TODO: allow splitting stacks?
			creToPower[i.second->type] += i.second->getPower();
		}
	}
	//TODO - consider more than just power (ie morale penalty, hero specialty in certain stacks, etc)
	int armySize = creToPower.size();

	armySize = std::min((source->needsLastStack() ? armySize - 1 : armySize), GameConstants::ARMY_SIZE); //can't move away last stack
	std::vector<const CCreature *> bestArmy; //types that'll be in final dst army
	for(int i = 0; i < armySize; i++) //pick the creatures from which we can get most power, as many as dest can fit
	{
		typedef const std::pair<const CCreature *, int> & CrePowerPair;
		auto creIt = boost::max_element(creToPower, [](CrePowerPair lhs, CrePowerPair rhs)
		{
			return lhs.second < rhs.second;
		});
		bestArmy.push_back(creIt->first);
		creToPower.erase(creIt);
		if(creToPower.empty())
			break;
	}

	//foreach best type -> iterate over slots in both armies and if it's the appropriate type, send it to the slot where it belongs
	for(int i = 0; i < bestArmy.size(); i++) //i-th strongest creature type will go to i-th slot
	{
		for(auto armyPtr : armies)
		{
			for(int j = 0; j < GameConstants::ARMY_SIZE; j++)
			{
				if(armyPtr->getCreature(SlotID(j)) == bestArmy[i] && (i != j || armyPtr != army)) //it's a searched creature not in dst SLOT
				{
					if(!(armyPtr->needsLastStack() && armyPtr->stacksCount() == 1)) //can't take away last creature
						cb->mergeOrSwapStacks(armyPtr, army, SlotID(j), SlotID(i));
				}
			}
		}
	}

	//TODO - having now strongest possible army, we may want to think about arranging stacks

	auto hero = dynamic_cast<const CGHeroInstance *>(army);
	if(hero)
		checkHeroArmy(hero);
}

void VCAI::pickBestArtifacts(const CGHeroInstance * h, const CGHeroInstance * other)
{
	auto equipBest = [](const CGHeroInstance * h, const CGHeroInstance * otherh, bool giveStuffToFirstHero) -> void
	{
		bool changeMade = false;
		do
		{
			changeMade = false;

			//we collect gear always in same order
			std::vector<ArtifactLocation> allArtifacts;
			if(giveStuffToFirstHero)
			{
				for(auto p : h->artifactsWorn)
				{
					if(p.second.artifact)
						allArtifacts.push_back(ArtifactLocation(h, p.first));
				}
			}
			for(auto slot : h->artifactsInBackpack)
				allArtifacts.push_back(ArtifactLocation(h, h->getArtPos(slot.artifact)));

			if(otherh)
			{
				for(auto p : otherh->artifactsWorn)
				{
					if(p.second.artifact)
						allArtifacts.push_back(ArtifactLocation(otherh, p.first));
				}
				for(auto slot : otherh->artifactsInBackpack)
					allArtifacts.push_back(ArtifactLocation(otherh, otherh->getArtPos(slot.artifact)));
			}
			//we give stuff to one hero or another, depending on giveStuffToFirstHero

			const CGHeroInstance * target = nullptr;
			if(giveStuffToFirstHero || !otherh)
				target = h;
			else
				target = otherh;

			for(auto location : allArtifacts)
			{
				if(location.relatedObj() == target && location.slot < ArtifactPosition::AFTER_LAST)
					continue; //don't reequip artifact we already wear

				if(location.slot == ArtifactPosition::MACH4) // don't attempt to move catapult
					continue;

				auto s = location.getSlot();
				if(!s || s->locked) //we can't move locks
					continue;
				auto artifact = s->artifact;
				if(!artifact)
					continue;
				//FIXME: why are the above possible to be null?

				bool emptySlotFound = false;
				for(auto slot : artifact->artType->possibleSlots.at(target->bearerType()))
				{
					ArtifactLocation destLocation(target, slot);
					if(target->isPositionFree(slot) && artifact->canBePutAt(destLocation, true)) //combined artifacts are not always allowed to move
					{
						cb->swapArtifacts(location, destLocation); //just put into empty slot
						emptySlotFound = true;
						changeMade = true;
						break;
					}
				}
				if(!emptySlotFound) //try to put that atifact in already occupied slot
				{
					for(auto slot : artifact->artType->possibleSlots.at(target->bearerType()))
					{
						auto otherSlot = target->getSlot(slot);
						if(otherSlot && otherSlot->artifact) //we need to exchange artifact for better one
						{
							ArtifactLocation destLocation(target, slot);
							//if that artifact is better than what we have, pick it
							if(compareArtifacts(artifact, otherSlot->artifact) && artifact->canBePutAt(destLocation, true)) //combined artifacts are not always allowed to move
							{
								cb->swapArtifacts(location, ArtifactLocation(target, target->getArtPos(otherSlot->artifact)));
								changeMade = true;
								break;
							}
						}
					}
				}
				if(changeMade)
					break; //start evaluating artifacts from scratch
			}
		}
		while(changeMade);
	};

	equipBest(h, other, true);

	if(other)
		equipBest(h, other, false);
}

void VCAI::recruitCreatures(const CGDwelling * d, const CArmedInstance * recruiter)
{
	for(int i = 0; i < d->creatures.size(); i++)
	{
		if(!d->creatures[i].second.size())
			continue;

		int count = d->creatures[i].first;
		CreatureID creID = d->creatures[i].second.back();
//		const CCreature *c = VLC->creh->creatures[creID];
// 		if(containsSavedRes(c->cost))
// 			continue;

		vstd::amin(count, freeResources() / VLC->creh->creatures[creID]->cost);
		if(count > 0)
			cb->recruitCreatures(d, recruiter, creID, count, i);
	}
}

bool VCAI::tryBuildStructure(const CGTownInstance * t, BuildingID building, unsigned int maxDays) const
{
	if(maxDays == 0)
	{
		logAi->warn("Request to build building %d in 0 days!", building.toEnum());
		return false;
	}

	if(!vstd::contains(t->town->buildings, building))
		return false; // no such building in town

	if(t->hasBuilt(building)) //Already built? Shouldn't happen in general
		return true;

	const CBuilding * buildPtr = t->town->buildings.at(building);

	auto toBuild = buildPtr->requirements.getFulfillmentCandidates([&](const BuildingID & buildID)
	{
		return t->hasBuilt(buildID);
	});
	toBuild.push_back(building);

	for(BuildingID buildID : toBuild)
	{
		EBuildingState::EBuildingState canBuild = cb->canBuildStructure(t, buildID);
		if(canBuild == EBuildingState::HAVE_CAPITAL || canBuild == EBuildingState::FORBIDDEN || canBuild == EBuildingState::NO_WATER)
			return false; //we won't be able to build this
	}

	if(maxDays && toBuild.size() > maxDays)
		return false;

	TResources currentRes = cb->getResourceAmount();
	//TODO: calculate if we have enough resources to build it in maxDays

	for(const auto & buildID : toBuild)
	{
		const CBuilding * b = t->town->buildings.at(buildID);

		EBuildingState::EBuildingState canBuild = cb->canBuildStructure(t, buildID);
		if(canBuild == EBuildingState::ALLOWED)
		{
			if(!containsSavedRes(b->resources))
			{
				logAi->debug("Player %d will build %s in town of %s at %s", playerID, b->Name(), t->name, t->pos.toString());
				cb->buildBuilding(t, buildID);
				return true;
			}
			continue;
		}
		else if(canBuild == EBuildingState::NO_RESOURCES)
		{
			//We can't do anything about it - no requests from this function
			continue;
		}
		else if(canBuild == EBuildingState::PREREQUIRES)
		{
			// can happen when dependencies have their own missing dependencies
			if(tryBuildStructure(t, buildID, maxDays - 1))
				return true;
		}
		else if(canBuild == EBuildingState::MISSING_BASE)
		{
			if(tryBuildStructure(t, b->upgrade, maxDays - 1))
				 return true;
		}
	}
	return false;
}

bool VCAI::tryBuildAnyStructure(const CGTownInstance * t, std::vector<BuildingID> buildList, unsigned int maxDays) const
{
	for(const auto & building : buildList)
	{
		if(t->hasBuilt(building))
			continue;
		if(tryBuildStructure(t, building, maxDays))
			return true;
	}
	return false; //Can't build anything
}

BuildingID VCAI::canBuildAnyStructure(const CGTownInstance * t, std::vector<BuildingID> buildList, unsigned int maxDays) const
{
	for(const auto & building : buildList)
	{
		if(t->hasBuilt(building))
			continue;
		if(cb->canBuildStructure(t, building))
			return building;
	}
	return BuildingID::NONE; //Can't build anything
}

bool VCAI::tryBuildNextStructure(const CGTownInstance * t, std::vector<BuildingID> buildList, unsigned int maxDays) const
{
	for(const auto & building : buildList)
	{
		if(t->hasBuilt(building))
			continue;
		return tryBuildStructure(t, building, maxDays);
	}
	return false; //Nothing to build
}

//Set of buildings for different goals. Does not include any prerequisites.
static const BuildingID essential[] = {BuildingID::TAVERN, BuildingID::TOWN_HALL};
static const BuildingID goldSource[] = {BuildingID::TOWN_HALL, BuildingID::CITY_HALL, BuildingID::CAPITOL};
static const BuildingID capitolRequirements[] = { BuildingID::FORT, BuildingID::CITADEL };
static const BuildingID unitsSource[] = { BuildingID::DWELL_LVL_1, BuildingID::DWELL_LVL_2, BuildingID::DWELL_LVL_3,
	BuildingID::DWELL_LVL_4, BuildingID::DWELL_LVL_5, BuildingID::DWELL_LVL_6, BuildingID::DWELL_LVL_7};
static const BuildingID unitsUpgrade[] = { BuildingID::DWELL_LVL_1_UP, BuildingID::DWELL_LVL_2_UP, BuildingID::DWELL_LVL_3_UP,
	BuildingID::DWELL_LVL_4_UP, BuildingID::DWELL_LVL_5_UP, BuildingID::DWELL_LVL_6_UP, BuildingID::DWELL_LVL_7_UP};
static const BuildingID unitGrowth[] = { BuildingID::FORT, BuildingID::CITADEL, BuildingID::CASTLE, BuildingID::HORDE_1,
	BuildingID::HORDE_1_UPGR, BuildingID::HORDE_2, BuildingID::HORDE_2_UPGR};
static const BuildingID _spells[] = {BuildingID::MAGES_GUILD_1, BuildingID::MAGES_GUILD_2, BuildingID::MAGES_GUILD_3,
	BuildingID::MAGES_GUILD_4, BuildingID::MAGES_GUILD_5};
static const BuildingID extra[] = {BuildingID::RESOURCE_SILO, BuildingID::SPECIAL_1, BuildingID::SPECIAL_2, BuildingID::SPECIAL_3,
	BuildingID::SPECIAL_4, BuildingID::SHIPYARD}; // all remaining buildings

void VCAI::buildStructure(const CGTownInstance * t) const
{
	//TODO make *real* town development system
	//TODO: faction-specific development: use special buildings, build dwellings in better order, etc
	//TODO: build resource silo, defences when needed
	//Possible - allow "locking" on specific building (build prerequisites and then building itself)

	//below algorithm focuses on economy growth at start of the game.
	TResources currentRes = cb->getResourceAmount();
	TResources currentIncome = t->dailyIncome();

	if(tryBuildAnyStructure(t, std::vector<BuildingID>(essential, essential + ARRAY_COUNT(essential))))
		return;

	//the more gold the better and less problems later
	if(tryBuildNextStructure(t, std::vector<BuildingID>(goldSource, goldSource + ARRAY_COUNT(goldSource))))
		return;

	//workaround for mantis #2696 - build fort and citadel - building castle will be handled without bug
	if(vstd::contains(t->builtBuildings, BuildingID::CITY_HALL) && cb->canBuildStructure(t, BuildingID::CAPITOL) != EBuildingState::HAVE_CAPITAL)
	{
		if(cb->canBuildStructure(t, BuildingID::CAPITOL) != EBuildingState::FORBIDDEN)
		{
			if(tryBuildNextStructure(t, std::vector<BuildingID>(capitolRequirements, capitolRequirements + ARRAY_COUNT(capitolRequirements))))
				return;
		}
	}

	//save money for capitol or city hall if capitol unavailable, do not build other things (unless gold source buildings are disabled in map editor)
	if(!vstd::contains(t->builtBuildings, BuildingID::CAPITOL) && cb->canBuildStructure(t, BuildingID::CAPITOL) != EBuildingState::HAVE_CAPITAL && cb->canBuildStructure(t, BuildingID::CAPITOL) != EBuildingState::FORBIDDEN)
		return;
	else if(!vstd::contains(t->builtBuildings, BuildingID::CITY_HALL) && cb->canBuildStructure(t, BuildingID::CAPITOL) == EBuildingState::HAVE_CAPITAL && cb->canBuildStructure(t, BuildingID::CITY_HALL) != EBuildingState::FORBIDDEN)
		return;
	else if(!vstd::contains(t->builtBuildings, BuildingID::TOWN_HALL) && cb->canBuildStructure(t, BuildingID::TOWN_HALL) != EBuildingState::FORBIDDEN)
		return;

	if(cb->getDate(Date::DAY_OF_WEEK) > 6) // last 2 days of week - try to focus on growth
	{
		if(tryBuildNextStructure(t, std::vector<BuildingID>(unitGrowth, unitGrowth + ARRAY_COUNT(unitGrowth)), 2))
			return;
	}

	// first in-game week or second half of any week: try build dwellings
	if(cb->getDate(Date::DAY) < 7 || cb->getDate(Date::DAY_OF_WEEK) > 3)
	{
		if(tryBuildAnyStructure(t, std::vector<BuildingID>(unitsSource, unitsSource + ARRAY_COUNT(unitsSource)), 8 - cb->getDate(Date::DAY_OF_WEEK)))
			return;
	}

	//try to upgrade dwelling
	for(int i = 0; i < ARRAY_COUNT(unitsUpgrade); i++)
	{
		if(t->hasBuilt(unitsSource[i]) && !t->hasBuilt(unitsUpgrade[i]))
		{
			if(tryBuildStructure(t, unitsUpgrade[i]))
				return;
		}
	}

	//remaining tasks
	if(tryBuildNextStructure(t, std::vector<BuildingID>(_spells, _spells + ARRAY_COUNT(_spells))))
		return;
	if(tryBuildAnyStructure(t, std::vector<BuildingID>(extra, extra + ARRAY_COUNT(extra))))
		return;

	//at the end, try to get and build any extra buildings with nonstandard slots (for example HotA 3rd level dwelling)
	std::vector<BuildingID> extraBuildings;
	for(auto buildingInfo : t->town->buildings)
	{
		if(buildingInfo.first > 43)
			extraBuildings.push_back(buildingInfo.first);
	}
	if(tryBuildAnyStructure(t, extraBuildings))
		return;
}

bool VCAI::isGoodForVisit(const CGObjectInstance * obj, HeroPtr h, SectorMap & sm)
{
	const int3 pos = obj->visitablePos();
	const int3 targetPos = sm.firstTileToGet(h, pos);
	if(!targetPos.valid())
		return false;
	if(!isTileNotReserved(h.get(), targetPos))
		return false;
	if(obj->wasVisited(playerID))
		return false;
	if(cb->getPlayerRelations(ai->playerID, obj->tempOwner) != PlayerRelations::ENEMIES && !isWeeklyRevisitable(obj))
		return false; // Otherwise we flag or get weekly resources / creatures
	if(!isSafeToVisit(h, pos))
		return false;
	if(!shouldVisit(h, obj))
		return false;
	if(vstd::contains(alreadyVisited, obj))
		return false;
	if(vstd::contains(reservedObjs, obj))
		return false;
	if(!isAccessibleForHero(targetPos, h))
		return false;

	const CGObjectInstance * topObj = cb->getVisitableObjs(obj->visitablePos()).back(); //it may be hero visiting this obj
	//we don't try visiting object on which allied or owned hero stands
	// -> it will just trigger exchange windows and AI will be confused that obj behind doesn't get visited
	if(topObj->ID == Obj::HERO && cb->getPlayerRelations(h->tempOwner, topObj->tempOwner) != PlayerRelations::ENEMIES)
		return false;
	else
		return true; //all of the following is met

}

bool VCAI::isTileNotReserved(const CGHeroInstance * h, int3 t)
{
	if(t.valid())
	{
		auto obj = cb->getTopObj(t);
		if(obj && vstd::contains(ai->reservedObjs, obj) && !vstd::contains(reservedHeroesMap[h], obj))
			return false; //do not capture object reserved by another hero
		else
			return true;
	}
	else
	{
		return false;
	}
}

bool VCAI::canRecruitAnyHero(const CGTownInstance * t) const
{
	//TODO: make gathering gold, building tavern or conquering town (?) possible subgoals
	if(!t)
		t = findTownWithTavern();
	if(!t)
		return false;
	if(cb->getResourceAmount(Res::GOLD) < GameConstants::HERO_GOLD_COST)
		return false;
	if(cb->getHeroesInfo().size() >= ALLOWED_ROAMING_HEROES)
		return false;
	if(!cb->getAvailableHeroes(t).size())
		return false;

	return true;
}

void VCAI::wander(HeroPtr h)
{
	//unclaim objects that are now dangerous for us
	auto reservedObjsSetCopy = reservedHeroesMap[h];
	for(auto obj : reservedObjsSetCopy)
	{
		if(!isSafeToVisit(h, obj->visitablePos()))
			unreserveObject(h, obj);
	}

	TimeCheck tc("looking for wander destination");

	while(h->movement)
	{
		validateVisitableObjs();
		std::vector<ObjectIdRef> dests;

		auto sm = getCachedSectorMap(h);

		//also visit our reserved objects - but they are not prioritized to avoid running back and forth
		vstd::copy_if(reservedHeroesMap[h], std::back_inserter(dests), [&](ObjectIdRef obj) -> bool
		{
			int3 pos = sm->firstTileToGet(h, obj->visitablePos());
			if(pos.valid() && isAccessibleForHero(pos, h)) //even nearby objects could be blocked by other heroes :(
				return true;

			return false;
		});

		int pass = 0;
		while(!dests.size() && pass < 3)
		{
			if(pass < 2) // optimization - first check objects in current sector; then in sectors around
			{
				auto objs = sm->getNearbyObjs(h, pass);
				vstd::copy_if(objs, std::back_inserter(dests), [&](ObjectIdRef obj) -> bool
				{
					return isGoodForVisit(obj, h, *sm);
				});
			}
			else // we only check full objects list if for some reason there are no objects in closest sectors
			{
				vstd::copy_if(visitableObjs, std::back_inserter(dests), [&](ObjectIdRef obj) -> bool
				{
					return isGoodForVisit(obj, h, *sm);
				});
			}
			pass++;
		}

		vstd::erase_if(dests, [&](ObjectIdRef obj) -> bool
		{
			return !isSafeToVisit(h, sm->firstTileToGet(h, obj->visitablePos()));
		});

		if(!dests.size())
		{
			if(cb->getVisitableObjs(h->visitablePos()).size() > 1)
				moveHeroToTile(h->visitablePos(), h); //just in case we're standing on blocked subterranean gate

			auto compareReinforcements = [h](const CGTownInstance * lhs, const CGTownInstance * rhs) -> bool
			{
				return howManyReinforcementsCanGet(h, lhs) < howManyReinforcementsCanGet(h, rhs);
			};

			std::vector<const CGTownInstance *> townsReachable;
			std::vector<const CGTownInstance *> townsNotReachable;
			for(const CGTownInstance * t : cb->getTownsInfo())
			{
				if(!t->visitingHero && howManyReinforcementsCanGet(h, t) && !vstd::contains(townVisitsThisWeek[h], t))
				{
					if(isAccessibleForHero(t->visitablePos(), h))
						townsReachable.push_back(t);
					else
						townsNotReachable.push_back(t);
				}
			}
			if(townsReachable.size())
			{
				boost::sort(townsReachable, compareReinforcements);
				dests.push_back(townsReachable.back());
			}
			else if(townsNotReachable.size())
			{			
				//TODO pick the truly best
				const CGTownInstance * t = *boost::max_element(townsNotReachable, compareReinforcements);
				logAi->debug("%s can't reach any town, we'll try to make our way to %s at %s", h->name, t->name, t->visitablePos().toString());
				int3 pos1 = h->pos;
				striveToGoal(sptr(Goals::ClearWayTo(t->visitablePos()).sethero(h)));
				//if out hero is stuck, we may need to request another hero to clear the way we see

				if(pos1 == h->pos && h == primaryHero()) //hero can't move
				{
					if(canRecruitAnyHero(t))
						recruitHero(t);
				}
				break;
			}
			else if(cb->getResourceAmount(Res::GOLD) >= GameConstants::HERO_GOLD_COST)
			{
				std::vector<const CGTownInstance *> towns = cb->getTownsInfo();
				vstd::erase_if(towns, [](const CGTownInstance * t) -> bool
				{
					for(const CGHeroInstance * h : cb->getHeroesInfo())
					{
						if(!t->getArmyStrength() || howManyReinforcementsCanGet(h, t))
							return true;
					}
					return false;
				});
				if (towns.size())
				{
					recruitHero(*boost::max_element(towns, compareArmyStrength));
				}
				break;
			}
			else
			{
				logAi->debug("Nowhere more to go...");
				break;
			}
		}
		//end of objs empty

		if(dests.size()) //performance improvement
		{
			const ObjectIdRef & dest = *boost::min_element(dests, CDistanceSorter(h.get())); //find next closest one

			//wander should not cause heroes to be reserved - they are always considered free
			logAi->debug("Of all %d destinations, object oid=%d seems nice", dests.size(), dest.id.getNum());
			if(!goVisitObj(dest, h))
			{
				if(!dest)
				{
					logAi->debug("Visit attempt made the object (id=%d) gone...", dest.id.getNum());
				}
				else
				{
					logAi->debug("Hero %s apparently used all MPs (%d left)", h->name, h->movement);
					return;
				}
			}
		}

		if(h->visitedTown)
		{
			townVisitsThisWeek[h].insert(h->visitedTown);
			buildArmyIn(h->visitedTown);
		}
	}
}

void VCAI::setGoal(HeroPtr h, Goals::TSubgoal goal)
{
	if(goal->invalid())
	{
		vstd::erase_if_present(lockedHeroes, h);
	}
	else
	{
		lockedHeroes[h] = goal;
		goal->setisElementar(false); //Force always evaluate goals before realizing
	}
}
void VCAI::evaluateGoal(HeroPtr h)
{
	if(vstd::contains(lockedHeroes, h))
		fh->setPriority(lockedHeroes[h]);
}

void VCAI::completeGoal(Goals::TSubgoal goal)
{
	logAi->trace("Completing goal: %s", goal->name());
	if(const CGHeroInstance * h = goal->hero.get(true))
	{
		auto it = lockedHeroes.find(h);
		if(it != lockedHeroes.end())
		{
			if(it->second == goal)
			{
				logAi->debug(goal->completeMessage());
				lockedHeroes.erase(it); //goal fulfilled, free hero
			}
		}
	}
	else //complete goal for all heroes maybe?
	{
		vstd::erase_if(lockedHeroes, [goal](std::pair<HeroPtr, Goals::TSubgoal> p)
		{
			if(*(p.second) == *goal || p.second->fulfillsMe(goal)) //we could have fulfilled goals of other heroes by chance
			{
				logAi->debug(p.second->completeMessage());
				return true;
			}
			return false;
		});
	}

}

void VCAI::battleStart(const CCreatureSet * army1, const CCreatureSet * army2, int3 tile, const CGHeroInstance * hero1, const CGHeroInstance * hero2, bool side)
{
	NET_EVENT_HANDLER;
	assert(playerID > PlayerColor::PLAYER_LIMIT || status.getBattle() == UPCOMING_BATTLE);
	status.setBattle(ONGOING_BATTLE);
	const CGObjectInstance * presumedEnemy = vstd::backOrNull(cb->getVisitableObjs(tile)); //may be nullptr in some very are cases -> eg. visited monolith and fighting with an enemy at the FoW covered exit
	battlename = boost::str(boost::format("Starting battle of %s attacking %s at %s") % (hero1 ? hero1->name : "a army") % (presumedEnemy ? presumedEnemy->getObjectName() : "unknown enemy") % tile.toString());
	CAdventureAI::battleStart(army1, army2, tile, hero1, hero2, side);
}

void VCAI::battleEnd(const BattleResult * br)
{
	NET_EVENT_HANDLER;
	assert(status.getBattle() == ONGOING_BATTLE);
	status.setBattle(ENDING_BATTLE);
	bool won = br->winner == myCb->battleGetMySide();
	logAi->debug("Player %d (%s): I %s the %s!", playerID, playerID.getStr(), (won ? "won" : "lost"), battlename);
	battlename.clear();
	CAdventureAI::battleEnd(br);
}

void VCAI::waitTillFree()
{
	auto unlock = vstd::makeUnlockSharedGuard(CGameState::mutex);
	status.waitTillFree();
}

void VCAI::markObjectVisited(const CGObjectInstance * obj)
{
	if(!obj)
		return;
	if(dynamic_cast<const CGVisitableOPH *>(obj)) //we may want to visit it with another hero
		return;
	if(dynamic_cast<const CGBonusingObject *>(obj)) //or another time
		return;
	if(obj->ID == Obj::MONSTER)
		return;
	alreadyVisited.insert(obj);
}

void VCAI::reserveObject(HeroPtr h, const CGObjectInstance * obj)
{
	reservedObjs.insert(obj);
	reservedHeroesMap[h].insert(obj);
	logAi->debug("reserved object id=%d; address=%p; name=%s", obj->id, obj, obj->getObjectName());
}

void VCAI::unreserveObject(HeroPtr h, const CGObjectInstance * obj)
{
	vstd::erase_if_present(reservedObjs, obj); //unreserve objects
	vstd::erase_if_present(reservedHeroesMap[h], obj);
}

void VCAI::markHeroUnableToExplore(HeroPtr h)
{
	heroesUnableToExplore.insert(h);
}
void VCAI::markHeroAbleToExplore(HeroPtr h)
{
	vstd::erase_if_present(heroesUnableToExplore, h);
}
bool VCAI::isAbleToExplore(HeroPtr h)
{
	return !vstd::contains(heroesUnableToExplore, h);
}
void VCAI::clearPathsInfo()
{
	heroesUnableToExplore.clear();
	cachedSectorMaps.clear();
}

void VCAI::validateVisitableObjs()
{
	std::string errorMsg;
	auto shouldBeErased = [&](const CGObjectInstance * obj) -> bool
	{
		if(obj)
			return !cb->getObj(obj->id, false); // no verbose output needed as we check object visibility
		else
			return true;
	};

	//errorMsg is captured by ref so lambda will take the new text
	errorMsg = " shouldn't be on the visitable objects list!";
	vstd::erase_if(visitableObjs, shouldBeErased);

	//FIXME: how comes our own heroes become inaccessible?
	vstd::erase_if(reservedHeroesMap, [](std::pair<HeroPtr, std::set<const CGObjectInstance *>> hp) -> bool
	{
		return !hp.first.get(true);
	});
	for(auto & p : reservedHeroesMap)
	{
		errorMsg = " shouldn't be on list for hero " + p.first->name + "!";
		vstd::erase_if(p.second, shouldBeErased);
	}

	errorMsg = " shouldn't be on the reserved objs list!";
	vstd::erase_if(reservedObjs, shouldBeErased);

	//TODO overkill, hidden object should not be removed. However, we can't know if hidden object is erased from game.
	errorMsg = " shouldn't be on the already visited objs list!";
	vstd::erase_if(alreadyVisited, shouldBeErased);
}

void VCAI::retrieveVisitableObjs(std::vector<const CGObjectInstance *> & out, bool includeOwned) const
{
	foreach_tile_pos([&](const int3 & pos)
	{
		for(const CGObjectInstance * obj : myCb->getVisitableObjs(pos, false))
		{
			if(includeOwned || obj->tempOwner != playerID)
				out.push_back(obj);
		}
	});
}

void VCAI::retrieveVisitableObjs()
{
	foreach_tile_pos([&](const int3 & pos)
	{
		for(const CGObjectInstance * obj : myCb->getVisitableObjs(pos, false))
		{
			if(obj->tempOwner != playerID)
				addVisitableObj(obj);
		}
	});
}

std::vector<const CGObjectInstance *> VCAI::getFlaggedObjects() const
{
	std::vector<const CGObjectInstance *> ret;
	for(const CGObjectInstance * obj : visitableObjs)
	{
		if(obj->tempOwner == playerID)
			ret.push_back(obj);
	}
	return ret;
}

void VCAI::addVisitableObj(const CGObjectInstance * obj)
{
	visitableObjs.insert(obj);
	helperObjInfo[obj] = ObjInfo(obj);

	// All teleport objects seen automatically assigned to appropriate channels
	auto teleportObj = dynamic_cast<const CGTeleport *>(obj);
	if(teleportObj)
		CGTeleport::addToChannel(knownTeleportChannels, teleportObj);
}

const CGObjectInstance * VCAI::lookForArt(int aid) const
{
	for(const CGObjectInstance * obj : ai->visitableObjs)
	{
		if(obj->ID == Obj::ARTIFACT && obj->subID == aid)
			return obj;
	}

	return nullptr;

	//TODO what if more than one artifact is available? return them all or some slection criteria
}

bool VCAI::isAccessible(const int3 & pos)
{
	//TODO precalculate for speed

	for(const CGHeroInstance * h : cb->getHeroesInfo())
	{
		if(isAccessibleForHero(pos, h))
			return true;
	}

	return false;
}

HeroPtr VCAI::getHeroWithGrail() const
{
	for(const CGHeroInstance * h : cb->getHeroesInfo())
	{
		if(h->hasArt(2)) //grail
			return h;
	}
	return nullptr;
}

const CGObjectInstance * VCAI::getUnvisitedObj(const std::function<bool(const CGObjectInstance *)> & predicate)
{
	//TODO smarter definition of unvisited
	for(const CGObjectInstance * obj : visitableObjs)
	{
		if(predicate(obj) && !vstd::contains(alreadyVisited, obj))
			return obj;
	}
	return nullptr;
}

bool VCAI::isAccessibleForHero(const int3 & pos, HeroPtr h, bool includeAllies) const
{
	// Don't visit tile occupied by allied hero
	if(!includeAllies)
	{
		for(auto obj : cb->getVisitableObjs(pos))
		{
			if(obj->ID == Obj::HERO && cb->getPlayerRelations(ai->playerID, obj->tempOwner) != PlayerRelations::ENEMIES)
			{
				if(obj != h.get())
					return false;
			}
		}
	}
	return cb->getPathsInfo(h.get())->getPathInfo(pos)->reachable();
}

bool VCAI::moveHeroToTile(int3 dst, HeroPtr h)
{
	//TODO: consider if blockVisit objects change something in our checks: AIUtility::isBlockVisitObj()

	auto afterMovementCheck = [&]() -> void
	{
		waitTillFree(); //movement may cause battle or blocking dialog
		if(!h)
		{
			lostHero(h);
			teleportChannelProbingList.clear();
			if(status.channelProbing()) // if hero lost during channel probing we need to switch this mode off
				status.setChannelProbing(false);
			throw cannotFulfillGoalException("Hero was lost!");
		}
	};

	logAi->debug("Moving hero %s to tile %s", h->name, dst.toString());
	int3 startHpos = h->visitablePos();
	bool ret = false;
	if(startHpos == dst)
	{
		//FIXME: this assertion fails also if AI moves onto defeated guarded object
		assert(cb->getVisitableObjs(dst).size() > 1); //there's no point in revisiting tile where there is no visitable object
		cb->moveHero(*h, CGHeroInstance::convertPosition(dst, true));
		afterMovementCheck(); // TODO: is it feasible to hero get killed there if game work properly?
		// not sure if AI can currently reconsider to attack bank while staying on it. Check issue 2084 on mantis for more information.
		ret = true;
	}
	else
	{
		CGPath path;
		cb->getPathsInfo(h.get())->getPath(path, dst);
		if(path.nodes.empty())
		{
			logAi->error("Hero %s cannot reach %s.", h->name, dst.toString());
			throw goalFulfilledException(sptr(Goals::VisitTile(dst).sethero(h)));
		}
		int i = path.nodes.size() - 1;

		auto getObj = [&](int3 coord, bool ignoreHero)
		{
			auto tile = cb->getTile(coord, false);
			assert(tile);
			return tile->topVisitableObj(ignoreHero);
			//return cb->getTile(coord,false)->topVisitableObj(ignoreHero);
		};

		auto isTeleportAction = [&](CGPathNode::ENodeAction action) -> bool
		{
			if(action != CGPathNode::TELEPORT_NORMAL && action != CGPathNode::TELEPORT_BLOCKING_VISIT)
			{
				if(action != CGPathNode::TELEPORT_BATTLE)
				{
					return false;
				}
			}

			return true;
		};

		auto getDestTeleportObj = [&](const CGObjectInstance * currentObject, const CGObjectInstance * nextObjectTop, const CGObjectInstance * nextObject) -> const CGObjectInstance *
		{
			if(CGTeleport::isConnected(currentObject, nextObjectTop))
				return nextObjectTop;
			if(nextObjectTop && nextObjectTop->ID == Obj::HERO)
			{
				if(CGTeleport::isConnected(currentObject, nextObject))
					return nextObject;
			}

			return nullptr;
		};

		auto doMovement = [&](int3 dst, bool transit)
		{
			cb->moveHero(*h, CGHeroInstance::convertPosition(dst, true), transit);
		};

		auto doTeleportMovement = [&](ObjectInstanceID exitId, int3 exitPos)
		{
			destinationTeleport = exitId;
			if(exitPos.valid())
				destinationTeleportPos = CGHeroInstance::convertPosition(exitPos, true);
			cb->moveHero(*h, h->pos);
			destinationTeleport = ObjectInstanceID();
			destinationTeleportPos = int3(-1);
			afterMovementCheck();
		};

		auto doChannelProbing = [&]() -> void
		{
			auto currentPos = CGHeroInstance::convertPosition(h->pos, false);
			auto currentExit = getObj(currentPos, true)->id;

			status.setChannelProbing(true);
			for(auto exit : teleportChannelProbingList)
				doTeleportMovement(exit, int3(-1));
			teleportChannelProbingList.clear();
			status.setChannelProbing(false);

			doTeleportMovement(currentExit, currentPos);
		};

		for(; i > 0; i--)
		{
			int3 currentCoord = path.nodes[i].coord;
			int3 nextCoord = path.nodes[i - 1].coord;

			auto currentObject = getObj(currentCoord, currentCoord == CGHeroInstance::convertPosition(h->pos, false));
			auto nextObjectTop = getObj(nextCoord, false);
			auto nextObject = getObj(nextCoord, true);
			auto destTeleportObj = getDestTeleportObj(currentObject, nextObjectTop, nextObject);
			if(isTeleportAction(path.nodes[i - 1].action) && destTeleportObj != nullptr)
			{
				//we use special login if hero standing on teleporter it's mean we need
				doTeleportMovement(destTeleportObj->id, nextCoord);
				if(teleportChannelProbingList.size())
					doChannelProbing();
				markObjectVisited(destTeleportObj); //FIXME: Monoliths are not correctly visited

				continue;
			}

			//stop sending move requests if the next node can't be reached at the current turn (hero exhausted his move points)
			if(path.nodes[i - 1].turns)
			{
				//blockedHeroes.insert(h); //to avoid attempts of moving heroes with very little MPs
				break;
			}

			int3 endpos = path.nodes[i - 1].coord;
			if(endpos == h->visitablePos())
				continue;

			bool isConnected = false;
			bool isNextObjectTeleport = false;
			// Check there is node after next one; otherwise transit is pointless
			if(i - 2 >= 0)
			{
				isConnected = CGTeleport::isConnected(nextObjectTop, getObj(path.nodes[i - 2].coord, false));
				isNextObjectTeleport = CGTeleport::isTeleport(nextObjectTop);
			}
			if(isConnected || isNextObjectTeleport)
			{
				// Hero should be able to go through object if it's allow transit
				doMovement(endpos, true);
			}
			else if(path.nodes[i - 1].layer == EPathfindingLayer::AIR)
			{
				doMovement(endpos, true);
			}
			else
			{
				doMovement(endpos, false);
			}

			afterMovementCheck();

			if(teleportChannelProbingList.size())
				doChannelProbing();
		}
	}
	if(h)
	{
		if(auto visitedObject = vstd::frontOrNull(cb->getVisitableObjs(h->visitablePos()))) //we stand on something interesting
		{
			if(visitedObject != *h)
				performObjectInteraction(visitedObject, h);
		}
	}
	if(h) //we could have lost hero after last move
	{
		completeGoal(sptr(Goals::VisitTile(dst).sethero(h))); //we stepped on some tile, anyway
		completeGoal(sptr(Goals::ClearWayTo(dst).sethero(h)));

		ret = (dst == h->visitablePos());

		if(!ret) //reserve object we are heading towards
		{
			auto obj = vstd::frontOrNull(cb->getVisitableObjs(dst));
			if(obj && obj != *h)
				reserveObject(h, obj);
		}

		if(startHpos == h->visitablePos() && !ret) //we didn't move and didn't reach the target
		{
			vstd::erase_if_present(lockedHeroes, h); //hero seemingly is confused
			throw cannotFulfillGoalException("Invalid path found!"); //FIXME: should never happen
		}
		evaluateGoal(h); //new hero position means new game situation
		logAi->debug("Hero %s moved from %s to %s. Returning %d.", h->name, startHpos.toString(), h->visitablePos().toString(), ret);
	}
	return ret;
}
void VCAI::tryRealize(Goals::Explore & g)
{
	throw cannotFulfillGoalException("EXPLORE is not an elementar goal!");
}

void VCAI::tryRealize(Goals::RecruitHero & g)
{
	if(const CGTownInstance * t = findTownWithTavern())
	{
		recruitHero(t, true);
		//TODO try to free way to blocked town
		//TODO: adventure map tavern or prison?
	}
}

void VCAI::tryRealize(Goals::VisitTile & g)
{
	if(!g.hero->movement)
		throw cannotFulfillGoalException("Cannot visit tile: hero is out of MPs!");
	if(g.tile == g.hero->visitablePos() && cb->getVisitableObjs(g.hero->visitablePos()).size() < 2)
	{
		logAi->warn("Why do I want to move hero %s to tile %s? Already standing on that tile! ", g.hero->name, g.tile.toString());
		throw goalFulfilledException(sptr(g));
	}
	if(ai->moveHeroToTile(g.tile, g.hero.get()))
	{
		throw goalFulfilledException(sptr(g));
	}
}

void VCAI::tryRealize(Goals::VisitHero & g)
{
	if(!g.hero->movement)
		throw cannotFulfillGoalException("Cannot visit target hero: hero is out of MPs!");

	const CGObjectInstance * obj = cb->getObj(ObjectInstanceID(g.objid));
	if(obj)
	{
		if(ai->moveHeroToTile(obj->visitablePos(), g.hero.get()))
		{
			throw goalFulfilledException(sptr(g));
		}
	}
	else
	{
		throw cannotFulfillGoalException("Cannot visit hero: object not found!");
	}
}

void VCAI::tryRealize(Goals::BuildThis & g)
{
	const CGTownInstance * t = g.town;

	if(!t && g.hero)
		t = g.hero->visitedTown;

	if(!t)
	{
		for(const CGTownInstance * t : cb->getTownsInfo())
		{
			switch(cb->canBuildStructure(t, BuildingID(g.bid)))
			{
			case EBuildingState::ALLOWED:
				cb->buildBuilding(t, BuildingID(g.bid));
				return;
			default:
				break;
			}
		}
	}
	else if(cb->canBuildStructure(t, BuildingID(g.bid)) == EBuildingState::ALLOWED)
	{
		cb->buildBuilding(t, BuildingID(g.bid));
		return;
	}
	throw cannotFulfillGoalException("Cannot build a given structure!");
}

void VCAI::tryRealize(Goals::DigAtTile & g)
{
	assert(g.hero->visitablePos() == g.tile); //surely we want to crash here?
	if(g.hero->diggingStatus() == EDiggingStatus::CAN_DIG)
	{
		cb->dig(g.hero.get());
		completeGoal(sptr(g)); // finished digging
	}
	else
	{
		ai->lockedHeroes[g.hero] = sptr(g); //hero who tries to dig shouldn't do anything else
		throw cannotFulfillGoalException("A hero can't dig!\n");
	}
}

void VCAI::tryRealize(Goals::CollectRes & g)
{
	if(cb->getResourceAmount(static_cast<Res::ERes>(g.resID)) >= g.value)
		throw cannotFulfillGoalException("Goal is already fulfilled!");

	if(const CGObjectInstance * obj = cb->getObj(ObjectInstanceID(g.objid), false))
	{
		if(const IMarket * m = IMarket::castFrom(obj, false))
		{
			for(Res::ERes i = Res::WOOD; i <= Res::GOLD; vstd::advance(i, 1))
			{
				if(i == g.resID)
					continue;
				int toGive, toGet;
				m->getOffer(i, g.resID, toGive, toGet, EMarketMode::RESOURCE_RESOURCE);
				toGive = toGive * (cb->getResourceAmount(i) / toGive);
				//TODO trade only as much as needed
				cb->trade(obj, EMarketMode::RESOURCE_RESOURCE, i, g.resID, toGive);
				if(cb->getResourceAmount(static_cast<Res::ERes>(g.resID)) >= g.value)
					return;
			}

			throw cannotFulfillGoalException("I cannot get needed resources by trade!");
		}
		else
		{
			throw cannotFulfillGoalException("I don't know how to use this object to raise resources!");
		}
	}
	else
	{
		saving[g.resID] = 1;
		throw cannotFulfillGoalException("No object that could be used to raise resources!");
	}
}

void VCAI::tryRealize(Goals::Build & g)
{
	for(const CGTownInstance * t : cb->getTownsInfo())
	{
		logAi->debug("Looking into %s", t->name);
		buildStructure(t);

		if(!ai->primaryHero() ||
			(t->getArmyStrength() > ai->primaryHero()->getArmyStrength() * 2 && !isAccessibleForHero(t->visitablePos(), ai->primaryHero())))
		{
			recruitHero(t);
			buildArmyIn(t);
		}
	}

	throw cannotFulfillGoalException("BUILD has been realized as much as possible.");
}
void VCAI::tryRealize(Goals::Invalid & g)
{
	throw cannotFulfillGoalException("I don't know how to fulfill this!");
}

void VCAI::tryRealize(Goals::AbstractGoal & g)
{
	logAi->debug("Attempting realizing goal with code %s", g.name());
	throw cannotFulfillGoalException("Unknown type of goal !");
}

const CGTownInstance * VCAI::findTownWithTavern() const
{
	for(const CGTownInstance * t : cb->getTownsInfo())
		if(t->hasBuilt(BuildingID::TAVERN) && !t->visitingHero)
			return t;

	return nullptr;
}

Goals::TSubgoal VCAI::getGoal(HeroPtr h) const
{
	auto it = lockedHeroes.find(h);
	if(it != lockedHeroes.end())
		return it->second;
	else
		return sptr(Goals::Invalid());
}


std::vector<HeroPtr> VCAI::getUnblockedHeroes() const
{
	std::vector<HeroPtr> ret;
	for(auto h : cb->getHeroesInfo())
	{
		//&& !vstd::contains(lockedHeroes, h)
		//at this point we assume heroes exhausted their locked goals
		if(canAct(h))
			ret.push_back(h);
	}
	return ret;
}

bool VCAI::canAct(HeroPtr h) const
{
	auto mission = lockedHeroes.find(h);
	if(mission != lockedHeroes.end())
	{
		//FIXME: I'm afraid there can be other conditions when heroes can act but not move :?
		if(mission->second->goalType == Goals::DIG_AT_TILE && !mission->second->isElementar)
			return false;
	}

	return h->movement;
}

HeroPtr VCAI::primaryHero() const
{
	auto hs = cb->getHeroesInfo();
	if (hs.empty())
		return nullptr;
	else
		return *boost::max_element(hs, compareHeroStrength);
}

void VCAI::endTurn()
{
	logAi->info("Player %d (%s) ends turn", playerID, playerID.getStr());
	if(!status.haveTurn())
	{
		logAi->error("Not having turn at the end of turn???");
	}
	logAi->debug("Resources at the end of turn: %s", cb->getResourceAmount().toString());
	do
	{
		cb->endTurn();
	}
	while(status.haveTurn()); //for some reasons, our request may fail -> stop requesting end of turn only after we've received a confirmation that it's over

	logGlobal->info("Player %d (%s) ended turn", playerID, playerID.getStr());
}

void VCAI::striveToGoal(Goals::TSubgoal ultimateGoal)
{
	if(ultimateGoal->invalid())
		return;

	//we are looking for abstract goals
	auto abstractGoal = striveToGoalInternal(ultimateGoal, false);

	if(abstractGoal->invalid())
		return;

	//we received abstract goal, need to find concrete goals
	striveToGoalInternal(abstractGoal, true);

	//TODO: save abstract goals not related to hero
}

Goals::TSubgoal VCAI::striveToGoalInternal(Goals::TSubgoal ultimateGoal, bool onlyAbstract)
{
	const int searchDepth = 30;
	const int searchDepth2 = searchDepth - 2;
	Goals::TSubgoal abstractGoal = sptr(Goals::Invalid());

	while(1)
	{
		Goals::TSubgoal goal = ultimateGoal;
		logAi->debug("Striving to goal of type %s", ultimateGoal->name());
		int maxGoals = searchDepth; //preventing deadlock for mutually dependent goals
		while(!goal->isElementar && maxGoals && (onlyAbstract || !goal->isAbstract))
		{
			logAi->debug("Considering goal %s", goal->name());
			try
			{
				boost::this_thread::interruption_point();
				goal = goal->whatToDoToAchieve();
				--maxGoals;
				if(*goal == *ultimateGoal) //compare objects by value
					throw cannotFulfillGoalException("Goal dependency loop detected!");
			}
			catch(goalFulfilledException & e)
			{
				//it is impossible to continue some goals (like exploration, for example)
				completeGoal(goal);
				logAi->debug("Goal %s decomposition failed: goal was completed as much as possible", goal->name());
				return sptr(Goals::Invalid());
			}
			catch(std::exception & e)
			{
				logAi->debug("Goal %s decomposition failed: %s", goal->name(), e.what());
				return sptr(Goals::Invalid());
			}
		}

		try
		{
			boost::this_thread::interruption_point();

			if(!maxGoals) //we counted down to 0 and found no solution
			{
				if(ultimateGoal->hero) // we seemingly don't know what to do with hero, free him
					vstd::erase_if_present(lockedHeroes, ultimateGoal->hero);
				std::runtime_error e("Too many subgoals, don't know what to do");
				throw (e);
			}
			else //we can proceed
			{
				if(goal->hero) //lock this hero to fulfill ultimate goal
				{
					setGoal(goal->hero, goal);
				}
			}

			if(goal->isAbstract)
			{
				abstractGoal = goal; //allow only one abstract goal per call
				logAi->debug("Choosing abstract goal %s", goal->name());
				break;
			}
			else
			{
				logAi->debug("Trying to realize %s (value %2.3f)", goal->name(), goal->priority);
				goal->accept(this);
			}

			boost::this_thread::interruption_point();
		}
		catch(boost::thread_interrupted & e)
		{
			logAi->debug("Player %d: Making turn thread received an interruption!", playerID);
			throw; //rethrow, we want to truly end this thread
		}
		catch(goalFulfilledException & e)
		{
			//the goal was completed successfully
			completeGoal(goal);
			//completed goal was main goal //TODO: find better condition
			if(ultimateGoal->fulfillsMe(goal) || maxGoals > searchDepth2)
				return sptr(Goals::Invalid());
		}
		catch(std::exception & e)
		{
			logAi->debug("Failed to realize subgoal of type %s (greater goal type was %s), I will stop.", goal->name(), ultimateGoal->name());
			logAi->debug("The error message was: %s", e.what());
			break;
		}
	}
	return abstractGoal;
}

void VCAI::striveToQuest(const QuestInfo & q)
{
	if(q.quest->missionType && q.quest->progress != CQuest::COMPLETE)
	{
		MetaString ms;
		q.quest->getRolloverText(ms, false);
		logAi->debug("Trying to realize quest: %s", ms.toString());
		auto heroes = cb->getHeroesInfo();

		switch(q.quest->missionType)
		{
		case CQuest::MISSION_ART:
		{
			for(auto hero : heroes) //TODO: remove duplicated code?
			{
				if(q.quest->checkQuest(hero))
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()).sethero(hero)));
					return;
				}
			}
			for(auto art : q.quest->m5arts)
			{
				striveToGoal(sptr(Goals::GetArtOfType(art))); //TODO: transport?
			}
			break;
		}
		case CQuest::MISSION_HERO:
		{
			//striveToGoal (CGoal(RECRUIT_HERO));
			for(auto hero : heroes)
			{
				if(q.quest->checkQuest(hero))
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()).sethero(hero)));
					return;
				}
			}
			striveToGoal(sptr(Goals::FindObj(Obj::PRISON))); //rule of a thumb - quest heroes usually are locked in prisons
			//BNLOG ("Don't know how to recruit hero with id %d\n", q.quest->m13489val);
			break;
		}
		case CQuest::MISSION_ARMY:
		{
			for(auto hero : heroes)
			{
				if(q.quest->checkQuest(hero)) //very bad info - stacks can be split between multiple heroes :(
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()).sethero(hero)));
					return;
				}
			}
			for(auto creature : q.quest->m6creatures)
			{
				striveToGoal(sptr(Goals::GatherTroops(creature.type->idNumber, creature.count)));
			}
			//TODO: exchange armies... oh my
			//BNLOG ("Don't know how to recruit %d of %s\n", (int)(creature.count) % creature.type->namePl);
			break;
		}
		case CQuest::MISSION_RESOURCES:
		{
			if(heroes.size())
			{
				if(q.quest->checkQuest(heroes.front())) //it doesn't matter which hero it is
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum())));
				}
				else
				{
					for(int i = 0; i < q.quest->m7resources.size(); ++i)
					{
						if(q.quest->m7resources[i])
							striveToGoal(sptr(Goals::CollectRes(i, q.quest->m7resources[i])));
					}
				}
			}
			else
				striveToGoal(sptr(Goals::RecruitHero())); //FIXME: checkQuest requires any hero belonging to player :(
			break;
		}
		case CQuest::MISSION_KILL_HERO:
		case CQuest::MISSION_KILL_CREATURE:
		{
			auto obj = cb->getObjByQuestIdentifier(q.quest->m13489val);
			if(obj)
				striveToGoal(sptr(Goals::GetObj(obj->id.getNum())));
			else
				striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()))); //visit seer hut
			break;
		}
		case CQuest::MISSION_PRIMARY_STAT:
		{
			auto heroes = cb->getHeroesInfo();
			for(auto hero : heroes)
			{
				if(q.quest->checkQuest(hero))
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()).sethero(hero)));
					return;
				}
			}
			for(int i = 0; i < q.quest->m2stats.size(); ++i)
			{
				logAi->debug("Don't know how to increase primary stat %d", i);
			}
			break;
		}
		case CQuest::MISSION_LEVEL:
		{
			auto heroes = cb->getHeroesInfo();
			for(auto hero : heroes)
			{
				if(q.quest->checkQuest(hero))
				{
					striveToGoal(sptr(Goals::GetObj(q.obj->id.getNum()).sethero(hero))); //TODO: causes infinite loop :/
					return;
				}
			}
			logAi->debug("Don't know how to reach hero level %d", q.quest->m13489val);
			break;
		}
		case CQuest::MISSION_PLAYER:
		{
			if(playerID.getNum() != q.quest->m13489val)
				logAi->debug("Can't be player of color %d", q.quest->m13489val);
			break;
		}
		case CQuest::MISSION_KEYMASTER:
		{
			striveToGoal(sptr(Goals::FindObj(Obj::KEYMASTER, q.obj->subID)));
			break;
		}
		}
	}
}

void VCAI::performTypicalActions()
{
	//TODO: build army only on request
	for(auto t : cb->getTownsInfo())
	{
		buildArmyIn(t);
	}
	for(auto h : getUnblockedHeroes())
	{
		if(!h) //hero might be lost. getUnblockedHeroes() called once on start of turn
			continue;

		logAi->debug("Looking into %s, MP=%d", h->name.c_str(), h->movement);
		makePossibleUpgrades(*h);
		pickBestArtifacts(*h);
		try
		{
			wander(h);
		}
		catch(std::exception & e)
		{
			logAi->debug("Cannot use this hero anymore, received exception: %s", e.what());
			continue;
		}
	}
}

void VCAI::buildArmyIn(const CGTownInstance * t)
{
	makePossibleUpgrades(t->visitingHero);
	makePossibleUpgrades(t);
	recruitCreatures(t, t->getUpperArmy());
	moveCreaturesToHero(t);
}

int3 VCAI::explorationBestNeighbour(int3 hpos, int radius, HeroPtr h)
{
	std::map<int3, int> dstToRevealedTiles;

	for(crint3 dir : int3::getDirs())
	{
		int3 tile = hpos + dir;
		if(cb->isInTheMap(tile))
		{
			if(isBlockVisitObj(tile))
				continue;

			if(isSafeToVisit(h, tile) && isAccessibleForHero(tile, h))
			{
				auto distance = hpos.dist2d(tile); // diagonal movement opens more tiles but spends more mp
				dstToRevealedTiles[tile] = howManyTilesWillBeDiscovered(tile, radius, cb.get(), h) / distance;
			}
		}
	}

	if(dstToRevealedTiles.empty()) //yes, it DID happen!
		throw cannotFulfillGoalException("No neighbour will bring new discoveries!");

	auto best = dstToRevealedTiles.begin();
	for(auto i = dstToRevealedTiles.begin(); i != dstToRevealedTiles.end(); i++)
	{
		const CGPathNode * pn = cb->getPathsInfo(h.get())->getPathInfo(i->first);
		//const TerrainTile *t = cb->getTile(i->first);
		if(best->second < i->second && pn->reachable() && pn->accessible == CGPathNode::ACCESSIBLE)
			best = i;
	}

	if(best->second)
		return best->first;

	throw cannotFulfillGoalException("No neighbour will bring new discoveries!");
}

int3 VCAI::explorationNewPoint(HeroPtr h)
{
	int radius = h->getSightRadius();
	CCallback * cbp = cb.get();
	const CGHeroInstance * hero = h.get();

	std::vector<std::vector<int3>> tiles; //tiles[distance_to_fow]
	tiles.resize(radius);

	foreach_tile_pos([&](const int3 & pos)
	{
		if(!cbp->isVisible(pos))
			tiles[0].push_back(pos);
	});

	float bestValue = 0; //discovered tile to node distance ratio
	int3 bestTile(-1, -1, -1);
	int3 ourPos = h->convertPosition(h->pos, false);

	for(int i = 1; i < radius; i++)
	{
		getVisibleNeighbours(tiles[i - 1], tiles[i]);
		vstd::removeDuplicates(tiles[i]);

		for(const int3 & tile : tiles[i])
		{
			if(tile == ourPos) //shouldn't happen, but it does
				continue;
			if(!cb->getPathsInfo(hero)->getPathInfo(tile)->reachable()) //this will remove tiles that are guarded by monsters (or removable objects)
				continue;

			CGPath path;
			cb->getPathsInfo(hero)->getPath(path, tile);
			float ourValue = (float)howManyTilesWillBeDiscovered(tile, radius, cbp, h) / (path.nodes.size() + 1); //+1 prevents erratic jumps

			if(ourValue > bestValue) //avoid costly checks of tiles that don't reveal much
			{
				if(isSafeToVisit(h, tile))
				{
					if(isBlockVisitObj(tile)) //we can't stand on that object
						continue;
					bestTile = tile;
					bestValue = ourValue;
				}
			}
		}
	}
	return bestTile;
}

int3 VCAI::explorationDesperate(HeroPtr h)
{
	auto sm = getCachedSectorMap(h);
	int radius = h->getSightRadius();

	std::vector<std::vector<int3>> tiles; //tiles[distance_to_fow]
	tiles.resize(radius);

	CCallback * cbp = cb.get();

	foreach_tile_pos([&](const int3 & pos)
	{
		if(!cbp->isVisible(pos))
			tiles[0].push_back(pos);
	});

	ui64 lowestDanger = -1;
	int3 bestTile(-1, -1, -1);

	for(int i = 1; i < radius; i++)
	{
		getVisibleNeighbours(tiles[i - 1], tiles[i]);
		vstd::removeDuplicates(tiles[i]);

		for(const int3 & tile : tiles[i])
		{
			if(cbp->getTile(tile)->blocked) //does it shorten the time?
				continue;
			if(!howManyTilesWillBeDiscovered(tile, radius, cbp, h)) //avoid costly checks of tiles that don't reveal much
				continue;

			auto t = sm->firstTileToGet(h, tile);
			if(t.valid())
			{
				ui64 ourDanger = evaluateDanger(t, h.h);
				if(ourDanger < lowestDanger)
				{
					if(!isBlockVisitObj(t))
					{
						if(!ourDanger) //at least one safe place found
							return t;

						bestTile = t;
						lowestDanger = ourDanger;
					}
				}
			}
		}
	}
	return bestTile;
}

TResources VCAI::estimateIncome() const
{
	TResources ret;
	for(const CGTownInstance * t : cb->getTownsInfo())
	{
		ret += t->dailyIncome();
	}

	for(const CGObjectInstance * obj : getFlaggedObjects())
	{
		if(obj->ID == Obj::MINE)
		{
			switch(obj->subID)
			{
			case Res::WOOD:
			case Res::ORE:
				ret[obj->subID] += WOOD_ORE_MINE_PRODUCTION;
				break;
			case Res::GOLD:
			case 7: //abandoned mine -> also gold
				ret[Res::GOLD] += GOLD_MINE_PRODUCTION;
				break;
			default:
				ret[obj->subID] += RESOURCE_MINE_PRODUCTION;
				break;
			}
		}
	}

	return ret;
}

bool VCAI::containsSavedRes(const TResources & cost) const
{
	for(int i = 0; i < GameConstants::RESOURCE_QUANTITY; i++)
	{
		if(saving[i] && cost[i])
			return true;
	}

	return false;
}

void VCAI::checkHeroArmy(HeroPtr h)
{
	auto it = lockedHeroes.find(h);
	if(it != lockedHeroes.end())
	{
		if(it->second->goalType == Goals::GATHER_ARMY && it->second->value <= h->getArmyStrength())
			completeGoal(sptr(Goals::GatherArmy(it->second->value).sethero(h)));
	}
}

void VCAI::recruitHero(const CGTownInstance * t, bool throwing)
{
	logAi->debug("Trying to recruit a hero in %s at %s", t->name, t->visitablePos().toString());

	auto heroes = cb->getAvailableHeroes(t);
	if(heroes.size())
	{
		auto hero = heroes[0];
		if(heroes.size() >= 2) //makes sense to recruit two heroes with starting amries in first week
		{
			if(heroes[1]->getTotalStrength() > hero->getTotalStrength())
				hero = heroes[1];
		}
		cb->recruitHero(t, hero);
	}
	else if(throwing)
	{
		throw cannotFulfillGoalException("No available heroes in tavern in " + t->nodeName());
	}
}

void VCAI::finish()
{
	if(makingTurn)
	{
		makingTurn->interrupt();
		makingTurn->join();
		makingTurn.reset();
	}
}

void VCAI::requestActionASAP(std::function<void()> whatToDo)
{
	boost::thread newThread([this, whatToDo]()
	{
		setThreadName("VCAI::requestActionASAP::whatToDo");
		SET_GLOBAL_STATE(this);
		boost::shared_lock<boost::shared_mutex> gsLock(CGameState::mutex);
		whatToDo();
	});
}

void VCAI::lostHero(HeroPtr h)
{
	logAi->debug("I lost my hero %s. It's best to forget and move on.", h.name);

	vstd::erase_if_present(lockedHeroes, h);
	for(auto obj : reservedHeroesMap[h])
	{
		vstd::erase_if_present(reservedObjs, obj); //unreserve all objects for that hero
	}
	vstd::erase_if_present(reservedHeroesMap, h);
	vstd::erase_if_present(cachedSectorMaps, h);
}

void VCAI::answerQuery(QueryID queryID, int selection)
{
	logAi->debug("I'll answer the query %d giving the choice %d", queryID, selection);
	if(queryID != QueryID(-1))
	{
		cb->selectionMade(selection, queryID);
	}
	else
	{
		logAi->debug("Since the query ID is %d, the answer won't be sent. This is not a real query!", queryID);
		//do nothing
	}
}

void VCAI::requestSent(const CPackForServer * pack, int requestID)
{
	//BNLOG("I have sent request of type %s", typeid(*pack).name());
	if(auto reply = dynamic_cast<const QueryReply *>(pack))
	{
		status.attemptedAnsweringQuery(reply->qid, requestID);
	}
}

std::string VCAI::getBattleAIName() const
{
	if(settings["server"]["enemyAI"].getType() == JsonNode::JsonType::DATA_STRING)
		return settings["server"]["enemyAI"].String();
	else
		return "BattleAI";
}

void VCAI::validateObject(const CGObjectInstance * obj)
{
	validateObject(obj->id);
}

void VCAI::validateObject(ObjectIdRef obj)
{
	auto matchesId = [&](const CGObjectInstance * hlpObj) -> bool
	{
		return hlpObj->id == obj.id;
	};
	if(!obj)
	{
		vstd::erase_if(visitableObjs, matchesId);

		for(auto & p : reservedHeroesMap)
			vstd::erase_if(p.second, matchesId);

		vstd::erase_if(reservedObjs, matchesId);
	}
}

TResources VCAI::freeResources() const
{
	TResources myRes = cb->getResourceAmount();
	auto iterator = cb->getTownsInfo();
	if(std::none_of(iterator.begin(), iterator.end(), [](const CGTownInstance * x) -> bool
	{
		return x->builtBuildings.find(BuildingID::CAPITOL) != x->builtBuildings.end();
	})
		/*|| std::all_of(iterator.begin(), iterator.end(), [](const CGTownInstance * x) -> bool { return x->forbiddenBuildings.find(BuildingID::CAPITOL) != x->forbiddenBuildings.end(); })*/ )
	myRes[Res::GOLD] -= GOLD_RESERVE; //what if capitol is blocked from building in all possessed towns (set in map editor)? What about reserve for city hall or something similar in that case?
	vstd::amax(myRes[Res::GOLD], 0);
	return myRes;
}

std::shared_ptr<SectorMap> VCAI::getCachedSectorMap(HeroPtr h)
{
	auto it = cachedSectorMaps.find(h);
	if(it != cachedSectorMaps.end())
	{
		return it->second;
	}
	else
	{
		cachedSectorMaps[h] = std::make_shared<SectorMap>(h);
		return cachedSectorMaps[h];
	}
}

AIStatus::AIStatus()
{
	battle = NO_BATTLE;
	havingTurn = false;
	ongoingHeroMovement = false;
	ongoingChannelProbing = false;
}

AIStatus::~AIStatus()
{

}

void AIStatus::setBattle(BattleState BS)
{
	boost::unique_lock<boost::mutex> lock(mx);
	LOG_TRACE_PARAMS(logAi, "battle state=%d", (int)BS);
	battle = BS;
	cv.notify_all();
}

BattleState AIStatus::getBattle()
{
	boost::unique_lock<boost::mutex> lock(mx);
	return battle;
}

void AIStatus::addQuery(QueryID ID, std::string description)
{
	if(ID == QueryID(-1))
	{
		logAi->debug("The \"query\" has an id %d, it'll be ignored as non-query. Description: %s", ID, description);
		return;
	}

	assert(ID.getNum() >= 0);
	boost::unique_lock<boost::mutex> lock(mx);

	assert(!vstd::contains(remainingQueries, ID));

	remainingQueries[ID] = description;

	cv.notify_all();
	logAi->debug("Adding query %d - %s. Total queries count: %d", ID, description, remainingQueries.size());
}

void AIStatus::removeQuery(QueryID ID)
{
	boost::unique_lock<boost::mutex> lock(mx);
	assert(vstd::contains(remainingQueries, ID));

	std::string description = remainingQueries[ID];
	remainingQueries.erase(ID);

	cv.notify_all();
	logAi->debug("Removing query %d - %s. Total queries count: %d", ID, description, remainingQueries.size());
}

int AIStatus::getQueriesCount()
{
	boost::unique_lock<boost::mutex> lock(mx);
	return remainingQueries.size();
}

void AIStatus::startedTurn()
{
	boost::unique_lock<boost::mutex> lock(mx);
	havingTurn = true;
	cv.notify_all();
}

void AIStatus::madeTurn()
{
	boost::unique_lock<boost::mutex> lock(mx);
	havingTurn = false;
	cv.notify_all();
}

void AIStatus::waitTillFree()
{
	boost::unique_lock<boost::mutex> lock(mx);
	while(battle != NO_BATTLE || !remainingQueries.empty() || !objectsBeingVisited.empty() || ongoingHeroMovement)
		cv.timed_wait(lock, boost::posix_time::milliseconds(100));
}

bool AIStatus::haveTurn()
{
	boost::unique_lock<boost::mutex> lock(mx);
	return havingTurn;
}

void AIStatus::attemptedAnsweringQuery(QueryID queryID, int answerRequestID)
{
	boost::unique_lock<boost::mutex> lock(mx);
	assert(vstd::contains(remainingQueries, queryID));
	std::string description = remainingQueries[queryID];
	logAi->debug("Attempted answering query %d - %s. Request id=%d. Waiting for results...", queryID, description, answerRequestID);
	requestToQueryID[answerRequestID] = queryID;
}

void AIStatus::receivedAnswerConfirmation(int answerRequestID, int result)
{
	assert(vstd::contains(requestToQueryID, answerRequestID));
	QueryID query = requestToQueryID[answerRequestID];
	assert(vstd::contains(remainingQueries, query));
	requestToQueryID.erase(answerRequestID);

	if(result)
	{
		removeQuery(query);
	}
	else
	{
		logAi->error("Something went really wrong, failed to answer query %d : %s", query.getNum(), remainingQueries[query]);
		//TODO safely retry
	}
}

void AIStatus::heroVisit(const CGObjectInstance * obj, bool started)
{
	boost::unique_lock<boost::mutex> lock(mx);
	if(started)
	{
		objectsBeingVisited.push_back(obj);
	}
	else
	{
		// There can be more than one object visited at the time (eg. hero visits Subterranean Gate
		// causing visit to hero on the other side.
		// However, we are guaranteed that start/end visit notification maintain stack order.
		assert(!objectsBeingVisited.empty());
		objectsBeingVisited.pop_back();
	}
	cv.notify_all();
}

void AIStatus::setMove(bool ongoing)
{
	boost::unique_lock<boost::mutex> lock(mx);
	ongoingHeroMovement = ongoing;
	cv.notify_all();
}

void AIStatus::setChannelProbing(bool ongoing)
{
	boost::unique_lock<boost::mutex> lock(mx);
	ongoingChannelProbing = ongoing;
	cv.notify_all();
}

bool AIStatus::channelProbing()
{
	return ongoingChannelProbing;
}

SectorMap::SectorMap()
{
	update();
}

SectorMap::SectorMap(HeroPtr h)
{
	update();
	makeParentBFS(h->visitablePos());
}

bool SectorMap::markIfBlocked(TSectorID & sec, crint3 pos, const TerrainTile * t)
{
	if(t->blocked && !t->visitable)
	{
		sec = NOT_AVAILABLE;
		return true;
	}

	return false;
}

bool SectorMap::markIfBlocked(TSectorID & sec, crint3 pos)
{
	return markIfBlocked(sec, pos, getTile(pos));
}

void SectorMap::update()
{
	visibleTiles = cb->getAllVisibleTiles();
	auto shape = visibleTiles->shape();
	sector.resize(boost::extents[shape[0]][shape[1]][shape[2]]);

	clear();
	int curSector = 3; //0 is invisible, 1 is not explored

	CCallback * cbp = cb.get(); //optimization
	foreach_tile_pos([&](crint3 pos)
	{
		if(retrieveTile(pos) == NOT_CHECKED)
		{
			if(!markIfBlocked(retrieveTile(pos), pos))
				exploreNewSector(pos, curSector++, cbp);
		}
	});
	valid = true;
}

SectorMap::TSectorID & SectorMap::retrieveTileN(SectorMap::TSectorArray & a, const int3 & pos)
{
	return a[pos.x][pos.y][pos.z];
}

const SectorMap::TSectorID & SectorMap::retrieveTileN(const SectorMap::TSectorArray & a, const int3 & pos)
{
	return a[pos.x][pos.y][pos.z];
}

void SectorMap::clear()
{
	//TODO: rotate to [z][x][y]
	auto fow = cb->getVisibilityMap();
	//TODO: any magic to automate this? will need array->array conversion
	//std::transform(fow.begin(), fow.end(), sector.begin(), [](const ui8 &f) -> unsigned short
	//{
	//	return f; //type conversion
	//});
	auto width = fow.size();
	auto height = fow.front().size();
	auto depth = fow.front().front().size();
	for(size_t x = 0; x < width; x++)
	{
		for(size_t y = 0; y < height; y++)
		{
			for(size_t z = 0; z < depth; z++)
				sector[x][y][z] = fow[x][y][z];
		}
	}
	valid = false;
}

void SectorMap::exploreNewSector(crint3 pos, int num, CCallback * cbp)
{
	Sector & s = infoOnSectors[num];
	s.id = num;
	s.water = getTile(pos)->isWater();

	std::queue<int3> toVisit;
	toVisit.push(pos);
	while(!toVisit.empty())
	{
		int3 curPos = toVisit.front();
		toVisit.pop();
		TSectorID & sec = retrieveTile(curPos);
		if(sec == NOT_CHECKED)
		{
			const TerrainTile * t = getTile(curPos);
			if(!markIfBlocked(sec, curPos, t))
			{
				if(t->isWater() == s.water) //sector is only-water or only-land
				{
					sec = num;
					s.tiles.push_back(curPos);
					foreach_neighbour(cbp, curPos, [&](CCallback * cbp, crint3 neighPos)
					{
						if(retrieveTile(neighPos) == NOT_CHECKED)
						{
							toVisit.push(neighPos);
							//parent[neighPos] = curPos;
						}
						const TerrainTile * nt = getTile(neighPos);
						if(nt && nt->isWater() != s.water && canBeEmbarkmentPoint(nt, s.water))
						{
							s.embarkmentPoints.push_back(neighPos);
						}
					});

					if(t->visitable)
					{
						auto obj = t->visitableObjects.front();
						if(cb->getObj(obj->id, false)) // FIXME: we have to filter invisible objcts like events, but probably TerrainTile shouldn't be used in SectorMap at all
							s.visitableObjs.push_back(obj);
					}
				}
			}
		}
	}

	vstd::removeDuplicates(s.embarkmentPoints);
}

void SectorMap::write(crstring fname)
{
	std::ofstream out(fname);
	for(int k = 0; k < cb->getMapSize().z; k++)
	{
		for(int j = 0; j < cb->getMapSize().y; j++)
		{
			for(int i = 0; i < cb->getMapSize().x; i++)
			{
				out << (int)sector[i][j][k] << '\t';
			}
			out << std::endl;
		}
		out << std::endl;
	}
}

bool isWeeklyRevisitable(const CGObjectInstance * obj)
{
	//TODO: allow polling of remaining creatures in dwelling
	if(dynamic_cast<const CGVisitableOPW *>(obj)) // ensures future compatibility, unlike IDs
		return true;
	if(dynamic_cast<const CGDwelling *>(obj))
		return true;
	if(dynamic_cast<const CBank *>(obj)) //banks tend to respawn often in mods
		return true;

	switch(obj->ID)
	{
	case Obj::STABLES:
	case Obj::MAGIC_WELL:
	case Obj::HILL_FORT:
		return true;
	case Obj::BORDER_GATE:
	case Obj::BORDERGUARD:
		return (dynamic_cast<const CGKeys *>(obj))->wasMyColorVisited(ai->playerID); //FIXME: they could be revisited sooner than in a week
	}
	return false;
}

bool shouldVisit(HeroPtr h, const CGObjectInstance * obj)
{
	switch(obj->ID)
	{
	case Obj::TOWN:
	case Obj::HERO: //never visit our heroes at random
		return obj->tempOwner != h->tempOwner; //do not visit our towns at random
	case Obj::BORDER_GATE:
	{
		for(auto q : ai->myCb->getMyQuests())
		{
			if(q.obj == obj)
			{
				return false; // do not visit guards or gates when wandering
			}
		}
		return true; //we don't have this quest yet
	}
	case Obj::BORDERGUARD: //open borderguard if possible
		return (dynamic_cast<const CGKeys *>(obj))->wasMyColorVisited(ai->playerID);
	case Obj::SEER_HUT:
	case Obj::QUEST_GUARD:
	{
		for(auto q : ai->myCb->getMyQuests())
		{
			if(q.obj == obj)
			{
				if(q.quest->checkQuest(h.h))
					return true; //we completed the quest
				else
					return false; //we can't complete this quest
			}
		}
		return true; //we don't have this quest yet
	}
	case Obj::CREATURE_GENERATOR1:
	{
		if(obj->tempOwner != h->tempOwner)
			return true; //flag just in case
		bool canRecruitCreatures = false;
		const CGDwelling * d = dynamic_cast<const CGDwelling *>(obj);
		for(auto level : d->creatures)
		{
			for(auto c : level.second)
			{
				if(h->getSlotFor(CreatureID(c)) != SlotID())
					canRecruitCreatures = true;
			}
		}
		return canRecruitCreatures;
	}
	case Obj::HILL_FORT:
	{
		for(auto slot : h->Slots())
		{
			if(slot.second->type->upgrades.size())
				return true; //TODO: check price?
		}
		return false;
	}
	case Obj::MONOLITH_ONE_WAY_ENTRANCE:
	case Obj::MONOLITH_ONE_WAY_EXIT:
	case Obj::MONOLITH_TWO_WAY:
	case Obj::WHIRLPOOL:
		return false;
	case Obj::SCHOOL_OF_MAGIC:
	case Obj::SCHOOL_OF_WAR:
	{
		TResources myRes = ai->myCb->getResourceAmount();
		if(myRes[Res::GOLD] - GOLD_RESERVE < 1000)
			return false;
		break;
	}
	case Obj::LIBRARY_OF_ENLIGHTENMENT:
		if(h->level < 12)
			return false;
		break;
	case Obj::TREE_OF_KNOWLEDGE:
	{
		TResources myRes = ai->myCb->getResourceAmount();
		if(myRes[Res::GOLD] - GOLD_RESERVE < 2000 || myRes[Res::GEMS] < 10)
			return false;
		break;
	}
	case Obj::MAGIC_WELL:
		return h->mana < h->manaLimit();
	case Obj::PRISON:
		return ai->myCb->getHeroesInfo().size() < VLC->modh->settings.MAX_HEROES_ON_MAP_PER_PLAYER;
	case Obj::TAVERN:
	{
		//TODO: make AI actually recruit heroes
		//TODO: only on request
		if(ai->myCb->getHeroesInfo().size() >= VLC->modh->settings.MAX_HEROES_ON_MAP_PER_PLAYER)
			return false;
		else if(ai->myCb->getResourceAmount()[Res::GOLD] - GOLD_RESERVE < GameConstants::HERO_GOLD_COST)
			return false;
		break;
	}
	case Obj::BOAT:
		return false;
	//Boats are handled by pathfinder
	case Obj::EYE_OF_MAGI:
		return false; //this object is useless to visit, but could be visited indefinitely
	}

	if(obj->wasVisited(*h)) //it must pointer to hero instance, heroPtr calls function wasVisited(ui8 player);
		return false;

	return true;
}

/*
this functions returns one target tile or invalid tile. We will use it to poll possible destinations
For ship construction etc, another function (goal?) is needed
*/
int3 SectorMap::firstTileToGet(HeroPtr h, crint3 dst)
{
	int3 ret(-1, -1, -1);

	int sourceSector = retrieveTile(h->visitablePos());
	int destinationSector = retrieveTile(dst);

	const Sector * src = &infoOnSectors[sourceSector];
	const Sector * dest = &infoOnSectors[destinationSector];

	if(sourceSector != destinationSector) //use ships, shipyards etc..
	{
		if(ai->isAccessibleForHero(dst, h)) //pathfinder can find a way using ships and gates if tile is not blocked by objects
			return dst;

		std::map<const Sector *, const Sector *> preds;
		std::queue<const Sector *> sectorQueue;
		sectorQueue.push(src);
		while(!sectorQueue.empty())
		{
			const Sector * s = sectorQueue.front();
			sectorQueue.pop();

			for(int3 ep : s->embarkmentPoints)
			{
				Sector * neigh = &infoOnSectors[retrieveTile(ep)];
				//preds[s].push_back(neigh);
				if(!preds[neigh])
				{
					preds[neigh] = s;
					sectorQueue.push(neigh);
				}
			}
		}

		if(!preds[dest])
		{
			//write("test.txt");

			return ret;
			//throw cannotFulfillGoalException(boost::str(boost::format("Cannot find connection between sectors %d and %d") % src->id % dst->id));
		}

		std::vector<const Sector *> toTraverse;
		toTraverse.push_back(dest);
		while(toTraverse.back() != src)
		{
			toTraverse.push_back(preds[toTraverse.back()]);
		}

		if(preds[dest])
		{
			//TODO: would be nice to find sectors in loop
			const Sector * sectorToReach = toTraverse.at(toTraverse.size() - 2);

			if(!src->water && sectorToReach->water) //embark
			{
				//embark on ship -> look for an EP with a boat
				auto firstEP = boost::find_if(src->embarkmentPoints, [=](crint3 pos) -> bool
				{
					const TerrainTile * t = getTile(pos);
					if(t && t->visitableObjects.size() == 1 && t->topVisitableId() == Obj::BOAT)
					{
						if(retrieveTile(pos) == sectorToReach->id)
							return true;
					}
					return false;
				});

				if(firstEP != src->embarkmentPoints.end())
				{
					return *firstEP;
				}
				else
				{
					//we need to find a shipyard with an access to the desired sector's EP
					//TODO what about Summon Boat spell?
					std::vector<const IShipyard *> shipyards;
					for(const CGTownInstance * t : cb->getTownsInfo())
					{
						if(t->hasBuilt(BuildingID::SHIPYARD))
							shipyards.push_back(t);
					}

					for(const CGObjectInstance * obj : ai->getFlaggedObjects())
					{
						if(obj->ID != Obj::TOWN) //towns were handled in the previous loop
						{
							if(const IShipyard * shipyard = IShipyard::castFrom(obj))
								shipyards.push_back(shipyard);
						}
					}

					shipyards.erase(boost::remove_if(shipyards, [=](const IShipyard * shipyard) -> bool
					{
						return shipyard->shipyardStatus() != 0 || retrieveTile(shipyard->bestLocation()) != sectorToReach->id;
					}), shipyards.end());

					if(!shipyards.size())
					{
						//TODO consider possibility of building shipyard in a town
						return ret;

						//throw cannotFulfillGoalException("There is no known shipyard!");
					}

					//we have only shipyards that possibly can build ships onto the appropriate EP
					auto ownedGoodShipyard = boost::find_if(shipyards, [](const IShipyard * s) -> bool
					{
						return s->o->tempOwner == ai->playerID;
					});

					if(ownedGoodShipyard != shipyards.end())
					{
						const IShipyard * s = *ownedGoodShipyard;
						TResources shipCost;
						s->getBoatCost(shipCost);
						if(cb->getResourceAmount().canAfford(shipCost))
						{
							int3 ret = s->bestLocation();
							cb->buildBoat(s); //TODO: move actions elsewhere
							return ret;
						}
						else
						{
							//TODO gather res
							return ret;

							//throw cannotFulfillGoalException("Not enough resources to build a boat");
						}
					}
					else
					{
						//TODO pick best shipyard to take over
						return shipyards.front()->o->visitablePos();
					}
				}
			}
			else if(src->water && !sectorToReach->water)
			{
				//TODO
				//disembark
				return ret;
			}
			else //use subterranean gates - not needed since gates are now handled via Pathfinder
			{
				return ret;
				//throw cannotFulfillGoalException("Land-land and water-water inter-sector transitions are not implemented!");
			}
		}
		else
		{
			return ret;
			//throw cannotFulfillGoalException("Inter-sector route detection failed: not connected sectors?");
		}
	}
	else
	{
		return findFirstVisitableTile(h, dst);
	}
}

int3 SectorMap::findFirstVisitableTile(HeroPtr h, crint3 dst)
{
	int3 ret(-1, -1, -1);
	int3 curtile = dst;

	while(curtile != h->visitablePos())
	{
		auto topObj = cb->getTopObj(curtile);
		if(topObj && topObj->ID == Obj::HERO && topObj != h.h)
		{
			if(cb->getPlayerRelations(h->tempOwner, topObj->tempOwner) != PlayerRelations::ENEMIES)
			{
				logAi->warn("Another allied hero stands in our way");
				return ret;
			}
		}
		if(ai->myCb->getPathsInfo(h.get())->getPathInfo(curtile)->reachable())
		{
			return curtile;
		}
		else
		{
			auto i = parent.find(curtile);
			if(i != parent.end())
			{
				assert(curtile != i->second);
				curtile = i->second;
			}
			else
			{
				return ret;
				//throw cannotFulfillGoalException("Unreachable tile in sector? Should not happen!");
			}
		}
	}
	return ret;
}

void SectorMap::makeParentBFS(crint3 source)
{
	parent.clear();

	int mySector = retrieveTile(source);
	std::queue<int3> toVisit;
	toVisit.push(source);
	while(!toVisit.empty())
	{
		int3 curPos = toVisit.front();
		toVisit.pop();
		TSectorID & sec = retrieveTile(curPos);
		assert(sec == mySector); //consider only tiles from the same sector
		UNUSED(sec);

		foreach_neighbour(curPos, [&](crint3 neighPos)
		{
			if(retrieveTile(neighPos) == mySector && !vstd::contains(parent, neighPos))
			{
				if(cb->canMoveBetween(curPos, neighPos))
				{
					toVisit.push(neighPos);
					parent[neighPos] = curPos;
				}
			}
		});
	}
}

SectorMap::TSectorID & SectorMap::retrieveTile(crint3 pos)
{
	return retrieveTileN(sector, pos);
}

TerrainTile * SectorMap::getTile(crint3 pos) const
{
	//out of bounds access should be handled by boost::multi_array
	//still we cached this array to avoid any checks
	return visibleTiles->operator[](pos.x)[pos.y][pos.z];
}

std::vector<const CGObjectInstance *> SectorMap::getNearbyObjs(HeroPtr h, bool sectorsAround)
{
	const Sector * heroSector = &infoOnSectors[retrieveTile(h->visitablePos())];
	if(sectorsAround)
	{
		std::vector<const CGObjectInstance *> ret;
		for(auto embarkPoint : heroSector->embarkmentPoints)
		{
			const Sector * embarkSector = &infoOnSectors[retrieveTile(embarkPoint)];
			range::copy(embarkSector->visitableObjs, std::back_inserter(ret));
		}
		return ret;
	}
	return heroSector->visitableObjs;
}