/*
 * CTownHandler.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 "CTownHandler.h"

#include "VCMI_Lib.h"
#include "CGeneralTextHandler.h"
#include "JsonNode.h"
#include "StringConstants.h"
#include "CCreatureHandler.h"
#include "CModHandler.h"
#include "CHeroHandler.h"
#include "CArtHandler.h"
#include "spells/CSpellHandler.h"
#include "filesystem/Filesystem.h"
#include "mapObjects/CObjectClassesHandler.h"
#include "mapObjects/CObjectHandler.h"

const int NAMES_PER_TOWN=16; // number of town names per faction in H3 files. Json can define any number

CBuilding::CBuilding():
	town(nullptr),mode(BUILD_NORMAL)
{

}

const std::string & CBuilding::Name() const
{
	return name;
}

const std::string & CBuilding::Description() const
{
	return description;
}

BuildingID CBuilding::getBase() const
{
	const CBuilding * build = this;
	while (build->upgrade >= 0)
	{
		build = build->town->buildings.at(build->upgrade);
	}

	return build->bid;
}

si32 CBuilding::getDistance(BuildingID buildID) const
{
	const CBuilding * build = town->buildings.at(buildID);
	int distance = 0;
	while (build->upgrade >= 0 && build != this)
	{
		build = build->town->buildings.at(build->upgrade);
		distance++;
	}
	if (build == this)
		return distance;
	return -1;
}

CFaction::CFaction()
{
	town = nullptr;
	index = 0;
	alignment = EAlignment::NEUTRAL;
}

CFaction::~CFaction()
{
	delete town;
}

CTown::CTown()
	: faction(nullptr), mageLevel(0), primaryRes(0), moatDamage(0), defaultTavernChance(0)
{
}

CTown::~CTown()
{
	for(auto & build : buildings)
		build.second.dellNull();

	for(auto & str : clientInfo.structures)
		str.dellNull();
}

std::vector<BattleHex> CTown::defaultMoatHexes()
{
	static const std::vector<BattleHex> moatHexes = {11, 28, 44, 61, 77, 111, 129, 146, 164, 181};
	return moatHexes;
}

std::string CTown::getFactionName() const
{
	if(faction == nullptr)
		return "Random";
	else
		return faction->name;
}

std::string CTown::getBuildingScope() const
{
	if(faction == nullptr)
		//no faction == random faction
		return "building";
	else
		return "building." + faction->identifier;
}

std::set<si32> CTown::getAllBuildings() const
{
	std::set<si32> res;

	for(const auto & b : buildings)
	{
		res.insert(b.first.num);
	}

	return std::move(res);
}


CTownHandler::CTownHandler()
{
	VLC->townh = this;

	randomTown = new CTown();
}

CTownHandler::~CTownHandler()
{
	delete randomTown;

	for(auto faction : factions)
		faction.dellNull();
}

JsonNode readBuilding(CLegacyConfigParser & parser)
{
	JsonNode ret;
	JsonNode & cost = ret["cost"];

	//note: this code will try to parse mithril as well but wil always return 0 for it
	for(const std::string & resID : GameConstants::RESOURCE_NAMES)
		cost[resID].Float() = parser.readNumber();

	cost.Struct().erase("mithril"); // erase mithril to avoid confusing validator

	parser.endLine();

	return ret;
}

std::vector<JsonNode> CTownHandler::loadLegacyData(size_t dataSize)
{
	std::vector<JsonNode> dest(dataSize);
	factions.resize(dataSize);

	auto getBuild = [&](size_t town, size_t building) -> JsonNode &
	{
		return dest[town]["town"]["buildings"][EBuildingType::names[building]];
	};

	CLegacyConfigParser parser("DATA/BUILDING.TXT");

	parser.endLine(); // header
	parser.endLine();

	//Unique buildings
	for (size_t town=0; town<dataSize; town++)
	{
		parser.endLine(); //header
		parser.endLine();

		int buildID = 17;
		do
		{
			getBuild(town, buildID) = readBuilding(parser);
			buildID++;
		}
		while (!parser.isNextEntryEmpty());
	}

	// Common buildings
	parser.endLine(); // header
	parser.endLine();
	parser.endLine();

	int buildID = 0;
	do
	{
		JsonNode building = readBuilding(parser);

		for (size_t town=0; town<dataSize; town++)
			getBuild(town, buildID) = building;

		buildID++;
	}
	while (!parser.isNextEntryEmpty());

	parser.endLine(); //header
	parser.endLine();

	//Dwellings
	for (size_t town=0; town<dataSize; town++)
	{
		parser.endLine(); //header
		parser.endLine();

		for (size_t i=0; i<14; i++)
		{
			getBuild(town, 30+i) = readBuilding(parser);
		}
	}
	{
		CLegacyConfigParser parser("DATA/BLDGNEUT.TXT");

		for(int building=0; building<15; building++)
		{
			std::string name  = parser.readString();
			std::string descr = parser.readString();
			parser.endLine();

			for(int j=0; j<dataSize; j++)
			{
				getBuild(j, building)["name"].String() = name;
				getBuild(j, building)["description"].String() = descr;
			}
		}
		parser.endLine(); // silo
		parser.endLine(); // blacksmith  //unused entries
		parser.endLine(); // moat

		//shipyard with the ship
		std::string name  = parser.readString();
		std::string descr = parser.readString();
		parser.endLine();

		for(int town=0; town<dataSize; town++)
		{
			getBuild(town, 20)["name"].String() = name;
			getBuild(town, 20)["description"].String() = descr;
		}

		//blacksmith
		for(int town=0; town<dataSize; town++)
		{
			getBuild(town, 16)["name"].String() =  parser.readString();
			getBuild(town, 16)["description"].String() = parser.readString();
			parser.endLine();
		}
	}
	{
		CLegacyConfigParser parser("DATA/BLDGSPEC.TXT");

		for(int town=0; town<dataSize; town++)
		{
			for(int build=0; build<9; build++)
			{
				getBuild(town, 17 + build)["name"].String() =  parser.readString();
				getBuild(town, 17 + build)["description"].String() = parser.readString();
				parser.endLine();
			}
			getBuild(town, 26)["name"].String() =  parser.readString(); // Grail
			getBuild(town, 26)["description"].String() = parser.readString();
			parser.endLine();

			getBuild(town, 15)["name"].String() =  parser.readString(); // Resource silo
			getBuild(town, 15)["description"].String() = parser.readString();
			parser.endLine();
		}
	}
	{
		CLegacyConfigParser parser("DATA/DWELLING.TXT");

		for(int town=0; town<dataSize; town++)
		{
			for(int build=0; build<14; build++)
			{
				getBuild(town, 30 + build)["name"].String() =  parser.readString();
				getBuild(town, 30 + build)["description"].String() = parser.readString();
				parser.endLine();
			}
		}
	}
	{
		CLegacyConfigParser typeParser("DATA/TOWNTYPE.TXT");
		CLegacyConfigParser nameParser("DATA/TOWNNAME.TXT");
		size_t townID=0;
		do
		{
			dest[townID]["name"].String() = typeParser.readString();

			for (int i=0; i<NAMES_PER_TOWN; i++)
			{
				JsonNode name;
				name.String() = nameParser.readString();
				dest[townID]["town"]["names"].Vector().push_back(name);
				nameParser.endLine();
			}
			townID++;
		}
		while (typeParser.endLine());
	}
	return dest;
}

void CTownHandler::loadBuildingRequirements(CBuilding * building, const JsonNode & source)
{
	if (source.isNull())
		return;

	BuildingRequirementsHelper hlp;
	hlp.building = building;
	hlp.town = building->town;
	hlp.json = source;
	requirementsToLoad.push_back(hlp);
}

void CTownHandler::loadBuilding(CTown * town, const std::string & stringID, const JsonNode & source)
{
	auto ret = new CBuilding();

	static const std::string modes [] = {"normal", "auto", "special", "grail"};

	ret->mode = static_cast<CBuilding::EBuildMode>(boost::find(modes, source["mode"].String()) - modes);

	ret->identifier = stringID;
	ret->town = town;
	ret->bid = BuildingID(source["id"].Float());
	ret->name = source["name"].String();
	ret->description = source["description"].String();
	ret->resources = TResources(source["cost"]);
	ret->produce =   TResources(source["produce"]);

	//MODS COMPATIBILITY FOR 0.96
	if(!ret->produce.nonZero())
	{
		switch (ret->bid) {
			break; case BuildingID::VILLAGE_HALL: ret->produce[Res::GOLD] = 500;
			break; case BuildingID::TOWN_HALL :   ret->produce[Res::GOLD] = 1000;
			break; case BuildingID::CITY_HALL :   ret->produce[Res::GOLD] = 2000;
			break; case BuildingID::CAPITOL :     ret->produce[Res::GOLD] = 4000;
			break; case BuildingID::GRAIL :       ret->produce[Res::GOLD] = 5000;
			break; case BuildingID::RESOURCE_SILO :
			{
				switch (ret->town->primaryRes)
				{
					case Res::GOLD:
						ret->produce[ret->town->primaryRes] = 500;
						break;
					case Res::WOOD_AND_ORE:
						ret->produce[Res::WOOD] = 1;
						ret->produce[Res::ORE] = 1;
						break;
					default:
						ret->produce[ret->town->primaryRes] = 1;
						break;
				}
			}
		}
	}

	loadBuildingRequirements(ret, source["requires"]);

	if (!source["upgrades"].isNull())
	{
		// building id and upgrades can't be the same
		if(stringID == source["upgrades"].String())
		{
			throw std::runtime_error(boost::str(boost::format("Building with ID '%s' of town '%s' can't be an upgrade of the same building.") %
												stringID % ret->town->getFactionName()));
		}

		VLC->modh->identifiers.requestIdentifier(ret->town->getBuildingScope(), source["upgrades"], [=](si32 identifier)
		{
			ret->upgrade = BuildingID(identifier);
		});
	}
	else
		ret->upgrade = BuildingID::NONE;

	ret->town->buildings[ret->bid] = ret;

	VLC->modh->identifiers.registerObject(source.meta, ret->town->getBuildingScope(), ret->identifier, ret->bid);
}

void CTownHandler::loadBuildings(CTown * town, const JsonNode & source)
{
	for(auto & node : source.Struct())
	{
		if (!node.second.isNull())
		{
			loadBuilding(town, node.first, node.second);
		}
	}
}

void CTownHandler::loadStructure(CTown &town, const std::string & stringID, const JsonNode & source)
{
	auto ret = new CStructure();

	ret->building = nullptr;
	ret->buildable = nullptr;

	VLC->modh->identifiers.tryRequestIdentifier( source.meta, "building." + town.faction->identifier, stringID, [=, &town](si32 identifier) mutable
	{
		ret->building = town.buildings[BuildingID(identifier)];
	});

	if (source["builds"].isNull())
	{
		VLC->modh->identifiers.tryRequestIdentifier( source.meta, "building." + town.faction->identifier, stringID, [=, &town](si32 identifier) mutable
		{
			ret->building = town.buildings[BuildingID(identifier)];
		});
	}
	else
	{
		VLC->modh->identifiers.requestIdentifier("building." + town.faction->identifier, source["builds"], [=, &town](si32 identifier) mutable
		{
			ret->buildable = town.buildings[BuildingID(identifier)];
		});
	}

	ret->identifier = stringID;
	ret->pos.x = source["x"].Float();
	ret->pos.y = source["y"].Float();
	ret->pos.z = source["z"].Float();

	ret->hiddenUpgrade = source["hidden"].Bool();
	ret->defName = source["animation"].String();
	ret->borderName = source["border"].String();
	ret->areaName = source["area"].String();

	town.clientInfo.structures.push_back(ret);
}

void CTownHandler::loadStructures(CTown &town, const JsonNode & source)
{
	for(auto &node : source.Struct())
	{
		if (!node.second.isNull())
			loadStructure(town, node.first, node.second);
	}
}

void CTownHandler::loadTownHall(CTown &town, const JsonNode & source)
{
	auto & dstSlots = town.clientInfo.hallSlots;
	auto & srcSlots = source.Vector();
	dstSlots.resize(srcSlots.size());

	for(size_t i=0; i<dstSlots.size(); i++)
	{
		auto & dstRow = dstSlots[i];
		auto & srcRow = srcSlots[i].Vector();
		dstRow.resize(srcRow.size());

		for(size_t j=0; j < dstRow.size(); j++)
		{
			auto & dstBox = dstRow[j];
			auto & srcBox = srcRow[j].Vector();
			dstBox.resize(srcBox.size());

			for(size_t k=0; k<dstBox.size(); k++)
			{
				auto & dst = dstBox[k];
				auto & src = srcBox[k];

				VLC->modh->identifiers.requestIdentifier("building." + town.faction->identifier, src, [&](si32 identifier)
				{
					dst = BuildingID(identifier);
				});
			}
		}
	}
}

CTown::ClientInfo::Point JsonToPoint(const JsonNode & node)
{
	CTown::ClientInfo::Point ret;
	ret.x = node["x"].Float();
	ret.y = node["y"].Float();
	return ret;
}

void CTownHandler::loadSiegeScreen(CTown &town, const JsonNode & source)
{
	town.clientInfo.siegePrefix = source["imagePrefix"].String();
	VLC->modh->identifiers.requestIdentifier("creature", source["shooter"], [&town](si32 creature)
	{
		town.clientInfo.siegeShooter = CreatureID(creature);
	});

	auto & pos = town.clientInfo.siegePositions;
	pos.resize(21);

	pos[8]  = JsonToPoint(source["towers"]["top"]["tower"]);
	pos[17] = JsonToPoint(source["towers"]["top"]["battlement"]);
	pos[20] = JsonToPoint(source["towers"]["top"]["creature"]);

	pos[2]  = JsonToPoint(source["towers"]["keep"]["tower"]);
	pos[15] = JsonToPoint(source["towers"]["keep"]["battlement"]);
	pos[18] = JsonToPoint(source["towers"]["keep"]["creature"]);

	pos[3]  = JsonToPoint(source["towers"]["bottom"]["tower"]);
	pos[16] = JsonToPoint(source["towers"]["bottom"]["battlement"]);
	pos[19] = JsonToPoint(source["towers"]["bottom"]["creature"]);

	pos[9]  = JsonToPoint(source["gate"]["gate"]);
	pos[10]  = JsonToPoint(source["gate"]["arch"]);

	pos[7]  = JsonToPoint(source["walls"]["upper"]);
	pos[6]  = JsonToPoint(source["walls"]["upperMid"]);
	pos[5]  = JsonToPoint(source["walls"]["bottomMid"]);
	pos[4]  = JsonToPoint(source["walls"]["bottom"]);

	pos[13] = JsonToPoint(source["moat"]["moat"]);
	pos[14] = JsonToPoint(source["moat"]["bank"]);

	pos[11] = JsonToPoint(source["static"]["bottom"]);
	pos[12] = JsonToPoint(source["static"]["top"]);
	pos[1]  = JsonToPoint(source["static"]["background"]);
}

static void readIcon(JsonNode source, std::string & small, std::string & large)
{
	if (source.getType() == JsonNode::DATA_STRUCT) // don't crash on old format
	{
		small = source["small"].String();
		large = source["large"].String();
	}
}

void CTownHandler::loadClientData(CTown &town, const JsonNode & source)
{
	CTown::ClientInfo & info = town.clientInfo;

	readIcon(source["icons"]["village"]["normal"], info.iconSmall[0][0], info.iconLarge[0][0]);
	readIcon(source["icons"]["village"]["built"], info.iconSmall[0][1], info.iconLarge[0][1]);
	readIcon(source["icons"]["fort"]["normal"], info.iconSmall[1][0], info.iconLarge[1][0]);
	readIcon(source["icons"]["fort"]["built"], info.iconSmall[1][1], info.iconLarge[1][1]);

	info.hallBackground = source["hallBackground"].String();
	info.musicTheme = source["musicTheme"].String();
	info.townBackground = source["townBackground"].String();
	info.guildWindow = source["guildWindow"].String();
	info.buildingsIcons = source["buildingsIcons"].String();

	//left for back compatibility - will be removed later
	if (source["guildBackground"].String() != "")
		info.guildBackground = source["guildBackground"].String();
	else
		info.guildBackground = "TPMAGE.bmp";
	if (source["tavernVideo"].String() != "")
	    info.tavernVideo = source["tavernVideo"].String();
	else
		info.tavernVideo = "TAVERN.BIK";
	//end of legacy assignment

	loadTownHall(town,   source["hallSlots"]);
	loadStructures(town, source["structures"]);
	loadSiegeScreen(town, source["siege"]);
}

void CTownHandler::loadTown(CTown &town, const JsonNode & source)
{
	auto resIter = boost::find(GameConstants::RESOURCE_NAMES, source["primaryResource"].String());
	if (resIter == std::end(GameConstants::RESOURCE_NAMES))
		town.primaryRes = Res::WOOD_AND_ORE; //Wood + Ore
	else
		town.primaryRes = resIter - std::begin(GameConstants::RESOURCE_NAMES);

	VLC->modh->identifiers.requestIdentifier("creature", source["warMachine"],
	[&town](si32 creature)
	{
		town.warMachine = CreatureID(creature).toCreature()->warMachine;
	});

	town.moatDamage = source["moatDamage"].Float();

	// Compatability for <= 0.98f mods
	if(source["moatHexes"].isNull())
	{
		town.moatHexes = CTown::defaultMoatHexes();
	}
	else
		town.moatHexes = source["moatHexes"].convertTo<std::vector<BattleHex> >();

	town.mageLevel = source["mageGuild"].Float();
	town.names = source["names"].convertTo<std::vector<std::string> >();

	//  Horde building creature level
	for(const JsonNode &node : source["horde"].Vector())
		town.hordeLvl[town.hordeLvl.size()] = node.Float();

	// town needs to have exactly 2 horde entries. Validation will take care of 2+ entries
	// but anything below 2 must be handled here
	for (size_t i=source["horde"].Vector().size(); i<2; i++)
		town.hordeLvl[i] = -1;

	const JsonVector & creatures = source["creatures"].Vector();

	town.creatures.resize(creatures.size());

	for (size_t i=0; i< creatures.size(); i++)
	{
		const JsonVector & level = creatures[i].Vector();

		town.creatures[i].resize(level.size());

		for (size_t j=0; j<level.size(); j++)
		{
			VLC->modh->identifiers.requestIdentifier("creature", level[j], [=, &town](si32 creature)
			{
				town.creatures[i][j] = CreatureID(creature);
			});
		}
	}

	town.defaultTavernChance = source["defaultTavern"].Float();
	/// set chance of specific hero class to appear in this town
	for(auto &node : source["tavern"].Struct())
	{
		int chance = node.second.Float();

		VLC->modh->identifiers.requestIdentifier(node.second.meta, "heroClass",node.first, [=, &town](si32 classID)
		{
			VLC->heroh->classes.heroClasses[classID]->selectionProbability[town.faction->index] = chance;
		});
	}

	for(auto &node : source["guildSpells"].Struct())
	{
		int chance = node.second.Float();

		VLC->modh->identifiers.requestIdentifier(node.second.meta, "spell", node.first, [=, &town](si32 spellID)
		{
			VLC->spellh->objects.at(spellID)->probabilities[town.faction->index] = chance;
		});
	}

	for (const JsonNode &d : source["adventureMap"]["dwellings"].Vector())
	{
		town.dwellings.push_back (d["graphics"].String());
		town.dwellingNames.push_back (d["name"].String());
	}

	loadBuildings(&town, source["buildings"]);
	loadClientData(town,source);
}

void CTownHandler::loadPuzzle(CFaction &faction, const JsonNode &source)
{
	faction.puzzleMap.reserve(GameConstants::PUZZLE_MAP_PIECES);

	std::string prefix = source["prefix"].String();
	for(const JsonNode &piece : source["pieces"].Vector())
	{
		size_t index = faction.puzzleMap.size();
		SPuzzleInfo spi;

		spi.x = piece["x"].Float();
		spi.y = piece["y"].Float();
		spi.whenUncovered = piece["index"].Float();
		spi.number = index;

		// filename calculation
		std::ostringstream suffix;
		suffix << std::setfill('0') << std::setw(2) << index;

		spi.filename = prefix + suffix.str();

		faction.puzzleMap.push_back(spi);
	}
	assert(faction.puzzleMap.size() == GameConstants::PUZZLE_MAP_PIECES);
}

CFaction * CTownHandler::loadFromJson(const JsonNode &source, const std::string & identifier)
{
	auto  faction = new CFaction();

	faction->name = source["name"].String();
	faction->identifier = identifier;

	faction->creatureBg120 = source["creatureBackground"]["120px"].String();
	faction->creatureBg130 = source["creatureBackground"]["130px"].String();


	faction->nativeTerrain = ETerrainType(vstd::find_pos(GameConstants::TERRAIN_NAMES,
		source["nativeTerrain"].String()));
	int alignment = vstd::find_pos(EAlignment::names, source["alignment"].String());
	if (alignment == -1)
		faction->alignment = EAlignment::NEUTRAL;
	else
		faction->alignment = static_cast<EAlignment::EAlignment>(alignment);

	if (!source["town"].isNull())
	{
		faction->town = new CTown();
		faction->town->faction = faction;
		loadTown(*faction->town, source["town"]);
	}
	else
		faction->town = nullptr;

	if (!source["puzzleMap"].isNull())
		loadPuzzle(*faction, source["puzzleMap"]);

	return faction;
}

void CTownHandler::loadObject(std::string scope, std::string name, const JsonNode & data)
{
	auto object = loadFromJson(data, normalizeIdentifier(scope, "core", name));

	object->index = factions.size();
	factions.push_back(object);

	if (object->town)
	{
		auto & info = object->town->clientInfo;
		info.icons[0][0] = 8 + object->index * 4 + 0;
		info.icons[0][1] = 8 + object->index * 4 + 1;
		info.icons[1][0] = 8 + object->index * 4 + 2;
		info.icons[1][1] = 8 + object->index * 4 + 3;

		VLC->modh->identifiers.requestIdentifier(scope, "object", "town", [=](si32 index)
		{
			// register town once objects are loaded
			JsonNode config = data["town"]["mapObject"];
			config["faction"].String() = name;
			config["faction"].meta = scope;
			if (config.meta.empty())// MODS COMPATIBILITY FOR 0.96
				config.meta = scope;
			VLC->objtypeh->loadSubObject(object->identifier, config, index, object->index);

			// MODS COMPATIBILITY FOR 0.96
			auto & advMap = data["town"]["adventureMap"];
			if (!advMap.isNull())
			{
				logGlobal->warn("Outdated town mod. Will try to generate valid templates out of fort");
				JsonNode config;
				config["animation"] = advMap["castle"];
				VLC->objtypeh->getHandlerFor(index, object->index)->addTemplate(config);
			}
		});
	}

	VLC->modh->identifiers.registerObject(scope, "faction", name, object->index);
}

void CTownHandler::loadObject(std::string scope, std::string name, const JsonNode & data, size_t index)
{
	auto object = loadFromJson(data, normalizeIdentifier(scope, "core", name));
	object->index = index;
	assert(factions[index] == nullptr); // ensure that this id was not loaded before
	factions[index] = object;

	if (object->town)
	{
		auto & info = object->town->clientInfo;
		info.icons[0][0] = (GameConstants::F_NUMBER + object->index) * 2 + 0;
		info.icons[0][1] = (GameConstants::F_NUMBER + object->index) * 2 + 1;
		info.icons[1][0] = object->index * 2 + 0;
		info.icons[1][1] = object->index * 2 + 1;

		VLC->modh->identifiers.requestIdentifier(scope, "object", "town", [=](si32 index)
		{
			// register town once objects are loaded
			JsonNode config = data["town"]["mapObject"];
			config["faction"].String() = name;
			config["faction"].meta = scope;
			VLC->objtypeh->loadSubObject(object->identifier, config, index, object->index);
		});
	}

	VLC->modh->identifiers.registerObject(scope, "faction", name, object->index);
}

void CTownHandler::loadRandomFaction()
{
	static const ResourceID randomFactionPath("config/factions/random.json");

	JsonNode randomFactionJson(randomFactionPath);
	randomFactionJson.setMeta("core", true);
	loadBuildings(randomTown, randomFactionJson["random"]["town"]["buildings"]);
}

void CTownHandler::loadCustom()
{
    loadRandomFaction();
}

void CTownHandler::afterLoadFinalization()
{
	initializeRequirements();
}

void CTownHandler::initializeRequirements()
{
	// must be done separately after all ID's are known
	for (auto & requirement : requirementsToLoad)
	{
		requirement.building->requirements = CBuilding::TRequired(requirement.json, [&](const JsonNode & node) -> BuildingID
		{
			if (node.Vector().size() > 1)
			{
				logGlobal->warnStream() << "Unexpected length of town buildings requirements: " << node.Vector().size();
				logGlobal->warnStream() << "Entry contains " << node;
			}
			return BuildingID(VLC->modh->identifiers.getIdentifier(requirement.town->getBuildingScope(), node.Vector()[0]).get());
		});
	}
	requirementsToLoad.clear();
}

std::vector<bool> CTownHandler::getDefaultAllowed() const
{
	std::vector<bool> allowedFactions;
	for(auto town : factions)
	{
		allowedFactions.push_back(town->town != nullptr);
	}
	return allowedFactions;
}

std::set<TFaction> CTownHandler::getAllowedFactions(bool withTown) const
{
	std::set<TFaction> allowedFactions;
	std::vector<bool> allowed;
	if (withTown)
		allowed = getDefaultAllowed();
	else
		allowed.resize( factions.size(), true);

	for (size_t i=0; i<allowed.size(); i++)
		if (allowed[i])
			allowedFactions.insert(i);

	return allowedFactions;
}

si32 CTownHandler::decodeFaction(const std::string & identifier)
{
	auto rawId = VLC->modh->identifiers.getIdentifier("core", "faction", identifier);
	if(rawId)
		return rawId.get();
	else
		return -1;
}

std::string CTownHandler::encodeFaction(const si32 index)
{
	return VLC->townh->factions[index]->identifier;
}