#pragma once


#include "BattleHex.h"
#include "ResourceSet.h"
#include "int3.h"
#include "GameConstants.h"
#include "CBattleCallback.h"

/*
 * IGameCallback.h, 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
 *
 */

struct SetMovePoints;
struct GiveBonus;
class CGObjectInstance;
class CGTownInstance;
class CGHeroInstance;
struct BlockingDialog;
struct InfoWindow;
struct MetaString;
struct ShowInInfobox;
struct BattleResult;
struct Component;
class CGameState;
struct PlayerSettings;
struct CPackForClient;
class CArtHandler;
class CArtifact;
class CArmedInstance;
struct TerrainTile;
struct PlayerState;
class CTown;
struct StackLocation;
struct ArtifactLocation;
class CArtifactInstance;
struct StartInfo;
struct InfoAboutTown;
struct UpgradeInfo;
struct SThievesGuildInfo;
struct CPath;
class CGDwelling;
struct InfoAboutHero;
class CMapHeader;
struct BattleAction;
class CStack;
class CSpell;
class CCreatureSet;
class CCreature;
class CStackBasicDescriptor;
struct TeamState;
struct QuestInfo;
class CGCreature;
class CSaveFile;
class CLoadFile;

class DLL_LINKAGE CGameInfoCallback : public virtual CCallbackBase
{
protected:
	CGameInfoCallback();
	CGameInfoCallback(CGameState *GS, boost::optional<PlayerColor> Player);
	bool hasAccess(boost::optional<PlayerColor> playerId) const;
	bool isVisible(int3 pos, boost::optional<PlayerColor> Player) const;
	bool isVisible(const CGObjectInstance *obj, boost::optional<PlayerColor> Player) const;
	bool isVisible(const CGObjectInstance *obj) const;

	bool canGetFullInfo(const CGObjectInstance *obj) const; //true we player owns obj or ally owns obj or privileged mode
	bool isOwnedOrVisited(const CGObjectInstance *obj) const;

public:
	//various
	int getDate(Date::EDateType mode=Date::DAY)const; //mode=0 - total days in game, mode=1 - day of week, mode=2 - current week, mode=3 - current month
	const StartInfo * getStartInfo(bool beforeRandomization = false)const;
	bool isAllowed(int type, int id); //type: 0 - spell; 1- artifact; 2 - secondary skill

	//player
	const PlayerState * getPlayer(PlayerColor color, bool verbose = true) const;
	int getResource(PlayerColor Player, Res::ERes which) const;
	bool isVisible(int3 pos) const;
	PlayerRelations::PlayerRelations getPlayerRelations(PlayerColor color1, PlayerColor color2) const;
	void getThievesGuildInfo(SThievesGuildInfo & thi, const CGObjectInstance * obj); //get thieves' guild info obtainable while visiting given object
	EPlayerStatus::EStatus getPlayerStatus(PlayerColor player) const; //-1 if no such player
	PlayerColor getCurrentPlayer() const; //player that currently makes move // TODO synchronous turns
	virtual PlayerColor getLocalPlayer() const; //player that is currently owning given client (if not a client, then returns current player)
	const PlayerSettings * getPlayerSettings(PlayerColor color) const;


	//armed object
	void getUpgradeInfo(const CArmedInstance *obj, SlotID stackPos, UpgradeInfo &out)const;

	//hero
	const CGHeroInstance* getHero(ObjectInstanceID objid) const;
	const CGHeroInstance* getHeroWithSubid(int subid) const;
	int getHeroCount(PlayerColor player, bool includeGarrisoned) const;
	bool getHeroInfo(const CGObjectInstance *hero, InfoAboutHero &dest) const;
	int getSpellCost(const CSpell * sp, const CGHeroInstance * caster) const; //when called during battle, takes into account creatures' spell cost reduction
	int estimateSpellDamage(const CSpell * sp, const CGHeroInstance * hero) const; //estimates damage of given spell; returns 0 if spell causes no dmg
	const CGHeroInstance* getSelectedHero(PlayerColor player) const; //nullptr if no hero is selected
	const CGHeroInstance* getSelectedHero() const; //of current (active) player
	const CArtifactInstance * getArtInstance(ArtifactInstanceID aid) const;
	const CGObjectInstance * getObjInstance(ObjectInstanceID oid) const;

	//objects
	const CGObjectInstance* getObj(ObjectInstanceID objid, bool verbose = true) const;
	std::vector <const CGObjectInstance * > getBlockingObjs(int3 pos)const;
	std::vector <const CGObjectInstance * > getVisitableObjs(int3 pos, bool verbose = true)const;
	std::vector <const CGObjectInstance * > getFlaggableObjects(int3 pos) const;
	std::vector <std::string > getObjDescriptions(int3 pos)const; //returns descriptions of objects at pos in order from the lowest to the highest
	PlayerColor getOwner(ObjectInstanceID heroID) const;
	const CGObjectInstance *getObjByQuestIdentifier(int identifier) const; //nullptr if object has been removed (eg. killed)

	//map
	int3 guardingCreaturePosition (int3 pos) const;
	std::vector<const CGObjectInstance*> getGuardingCreatures (int3 pos) const;
	const CMapHeader * getMapHeader()const;
	int3 getMapSize() const; //returns size of map - z is 1 for one - level map and 2 for two level map
	const TerrainTile * getTile(int3 tile, bool verbose = true) const;
	bool isInTheMap(const int3 &pos) const;

	//town
	const CGTownInstance* getTown(ObjectInstanceID objid) const;
	int howManyTowns(PlayerColor Player) const;
	const CGTownInstance * getTownInfo(int val, bool mode)const; //mode = 0 -> val = player town serial; mode = 1 -> val = object id (serial)
	std::vector<const CGHeroInstance *> getAvailableHeroes(const CGObjectInstance * townOrTavern) const; //heroes that can be recruited
	std::string getTavernGossip(const CGObjectInstance * townOrTavern) const; 
	EBuildingState::EBuildingState canBuildStructure(const CGTownInstance *t, BuildingID ID);//// 0 - no more than one capitol, 1 - lack of water, 2 - forbidden, 3 - Add another level to Mage Guild, 4 - already built, 5 - cannot build, 6 - cannot afford, 7 - build, 8 - lack of requirements
	std::set<BuildingID> getBuildingRequiments(const CGTownInstance *t, BuildingID ID);
	virtual bool getTownInfo(const CGObjectInstance *town, InfoAboutTown &dest) const;
	const CTown *getNativeTown(PlayerColor color) const;

	//from gs
	const TeamState *getTeam(TeamID teamID) const;
	const TeamState *getPlayerTeam(PlayerColor color) const;
	std::set<BuildingID> getBuildingRequiments(const CGTownInstance *t, BuildingID ID) const;
	EBuildingState::EBuildingState canBuildStructure(const CGTownInstance *t, BuildingID ID) const;// 0 - no more than one capitol, 1 - lack of water, 2 - forbidden, 3 - Add another level to Mage Guild, 4 - already built, 5 - cannot build, 6 - cannot afford, 7 - build, 8 - lack of requirements
};


class DLL_LINKAGE CPlayerSpecificInfoCallback : public CGameInfoCallback
{
public:
	int howManyTowns() const;
	int howManyHeroes(bool includeGarrisoned = true) const;
	int3 getGrailPos(double &outKnownRatio);
	boost::optional<PlayerColor> getMyColor() const;

	std::vector <const CGTownInstance *> getTownsInfo(bool onlyOur = true) const; //true -> only owned; false -> all visible
	int getHeroSerial(const CGHeroInstance * hero, bool includeGarrisoned=true) const;
	const CGTownInstance* getTownBySerial(int serialId) const; // serial id is [0, number of towns)
	const CGHeroInstance* getHeroBySerial(int serialId, bool includeGarrisoned=true) const; // serial id is [0, number of heroes)
	std::vector <const CGHeroInstance *> getHeroesInfo(bool onlyOur = true) const; //true -> only owned; false -> all visible
	std::vector <const CGDwelling *> getMyDwellings() const; //returns all dwellings that belong to player
	std::vector <const CGObjectInstance * > getMyObjects() const; //returns all objects flagged by belonging player
	std::vector <QuestInfo> getMyQuests() const;

	int getResourceAmount(Res::ERes type) const;
	TResources getResourceAmount() const;
	const std::vector< std::vector< std::vector<ui8> > > & getVisibilityMap()const; //returns visibility map 
	const PlayerSettings * getPlayerSettings(PlayerColor color) const;
};

class DLL_LINKAGE CPrivilagedInfoCallback : public CGameInfoCallback
{
public:
	CGameState * gameState ();
	void getFreeTiles (std::vector<int3> &tiles) const; //used for random spawns
	void getTilesInRange(std::unordered_set<int3, ShashInt3> &tiles, int3 pos, int radious, boost::optional<PlayerColor> player = boost::optional<PlayerColor>(), int mode=0) const;  //mode 1 - only unrevealed tiles; mode 0 - all, mode -1 -  only unrevealed
	void getAllTiles (std::unordered_set<int3, ShashInt3> &tiles, boost::optional<PlayerColor> player = boost::optional<PlayerColor>(), int level=-1, int surface=0) const; //returns all tiles on given level (-1 - both levels, otherwise number of level); surface: 0 - land and water, 1 - only land, 2 - only water
	ArtifactID getRandomArt (int flags);
	ArtifactID getArtSync (ui32 rand, int flags, bool erasePicked); //synchronous
	void pickAllowedArtsSet(std::vector<const CArtifact*> &out); //gives 3 treasures, 3 minors, 1 major -> used by Black Market and Artifact Merchant
	void getAllowedSpells(std::vector<SpellID> &out, ui16 level);

	template<typename Saver>
	void saveCommonState(Saver &out) const; //stores GS and VLC

	template<typename Loader>
	void loadCommonState(Loader &in); //loads GS and VLC
};

class DLL_LINKAGE CNonConstInfoCallback : public CPrivilagedInfoCallback
{
public:
	PlayerState *getPlayer(PlayerColor color, bool verbose = true);
	TeamState *getTeam(TeamID teamID);//get team by team ID
	TeamState *getPlayerTeam(PlayerColor color);// get team by player color
	CGHeroInstance *getHero(ObjectInstanceID objid);
	CGTownInstance *getTown(ObjectInstanceID objid);
	TerrainTile * getTile(int3 pos);
	CArtifactInstance * getArtInstance(ArtifactInstanceID aid);
	CGObjectInstance * getObjInstance(ObjectInstanceID oid);
};

class DLL_LINKAGE IGameEventRealizer
{
public:
	virtual void commitPackage(CPackForClient *pack) = 0;

	virtual void showInfoDialog(InfoWindow *iw);
	virtual void setObjProperty(ObjectInstanceID objid, int prop, si64 val);


	virtual void showInfoDialog(const std::string &msg, PlayerColor player);
};

class DLL_LINKAGE IGameEventCallback : public IGameEventRealizer
{
public:
	virtual void changeSpells(const CGHeroInstance * hero, bool give, const std::set<SpellID> &spells)=0;
	virtual bool removeObject(const CGObjectInstance * obj)=0;
	virtual void setBlockVis(ObjectInstanceID objid, bool bv)=0;
	virtual void setOwner(const CGObjectInstance * objid, PlayerColor owner)=0;
	virtual void setHoverName(const CGObjectInstance * obj, MetaString * name)=0;
	virtual void changePrimSkill(const CGHeroInstance * hero, PrimarySkill::PrimarySkill which, si64 val, bool abs=false)=0;
	virtual void changeSecSkill(const CGHeroInstance * hero, SecondarySkill which, int val, bool abs=false)=0; 
	virtual void showBlockingDialog(BlockingDialog *iw) =0;
	virtual void showGarrisonDialog(ObjectInstanceID upobj, ObjectInstanceID hid, bool removableUnits) =0; //cb will be called when player closes garrison window
	virtual void showThievesGuildWindow(PlayerColor player, ObjectInstanceID requestingObjId) =0;
	virtual void giveResource(PlayerColor player, Res::ERes which, int val)=0;
	virtual void giveResources(PlayerColor player, TResources resources)=0;

	virtual void giveCreatures(const CArmedInstance *objid, const CGHeroInstance * h, const CCreatureSet &creatures, bool remove) =0;
	virtual void takeCreatures(ObjectInstanceID objid, const std::vector<CStackBasicDescriptor> &creatures) =0;
	virtual bool changeStackCount(const StackLocation &sl, TQuantity count, bool absoluteValue = false) =0;
	virtual bool changeStackType(const StackLocation &sl, CCreature *c) =0;
	virtual bool insertNewStack(const StackLocation &sl, const CCreature *c, TQuantity count = -1) =0; //count -1 => moves whole stack
	virtual bool eraseStack(const StackLocation &sl, bool forceRemoval = false) =0;
	virtual bool swapStacks(const StackLocation &sl1, const StackLocation &sl2) =0;
	virtual bool addToSlot(const StackLocation &sl, const CCreature *c, TQuantity count) =0; //makes new stack or increases count of already existing
	virtual void tryJoiningArmy(const CArmedInstance *src, const CArmedInstance *dst, bool removeObjWhenFinished, bool allowMerging) =0; //merges army from src do dst or opens a garrison window
	virtual bool moveStack(const StackLocation &src, const StackLocation &dst, TQuantity count) = 0;

	virtual void removeAfterVisit(const CGObjectInstance *object) = 0; //object will be destroyed when interaction is over. Do not call when interaction is not ongoing!

	virtual void giveHeroNewArtifact(const CGHeroInstance *h, const CArtifact *artType, ArtifactPosition pos) = 0;
	virtual void giveHeroArtifact(const CGHeroInstance *h, const CArtifactInstance *a, ArtifactPosition pos) = 0; //pos==-1 - first free slot in backpack=0; pos==-2 - default if available or backpack
	virtual void putArtifact(const ArtifactLocation &al, const CArtifactInstance *a) = 0;
	virtual void removeArtifact(const ArtifactLocation &al) = 0;
	virtual bool moveArtifact(const ArtifactLocation &al1, const ArtifactLocation &al2) = 0;
	virtual void synchronizeArtifactHandlerLists() = 0;

	virtual void showCompInfo(ShowInInfobox * comp)=0;
	virtual void heroVisitCastle(const CGTownInstance * obj, const CGHeroInstance * hero)=0;
	virtual void stopHeroVisitCastle(const CGTownInstance * obj, const CGHeroInstance * hero)=0;
	virtual void startBattlePrimary(const CArmedInstance *army1, const CArmedInstance *army2, int3 tile, const CGHeroInstance *hero1, const CGHeroInstance *hero2, bool creatureBank = false, const CGTownInstance *town = nullptr)=0; //use hero=nullptr for no hero
	virtual void startBattleI(const CArmedInstance *army1, const CArmedInstance *army2, int3 tile, bool creatureBank = false)=0; //if any of armies is hero, hero will be used
	virtual void startBattleI(const CArmedInstance *army1, const CArmedInstance *army2, bool creatureBank = false)=0; //if any of armies is hero, hero will be used, visitable tile of second obj is place of battle
	virtual void setAmount(ObjectInstanceID objid, ui32 val)=0;
	virtual bool moveHero(ObjectInstanceID hid, int3 dst, ui8 teleporting, PlayerColor asker = PlayerColor::NEUTRAL)=0;
	virtual void giveHeroBonus(GiveBonus * bonus)=0;
	virtual void setMovePoints(SetMovePoints * smp)=0;
	virtual void setManaPoints(ObjectInstanceID hid, int val)=0;
	virtual void giveHero(ObjectInstanceID id, PlayerColor player)=0;
	virtual void changeObjPos(ObjectInstanceID objid, int3 newPos, ui8 flags)=0;
	virtual void sendAndApply(CPackForClient * info)=0;
	virtual void heroExchange(ObjectInstanceID hero1, ObjectInstanceID hero2)=0; //when two heroes meet on adventure map
	virtual void addQuest(int player, QuestInfo & quest){};
};

/// Interface class for handling general game logic and actions
class DLL_LINKAGE IGameCallback : public CPrivilagedInfoCallback, public IGameEventCallback
{
public:
	virtual ~IGameCallback(){};

	//do sth
	const CGObjectInstance *putNewObject(Obj ID, int subID, int3 pos);
	const CGCreature *putNewMonster(CreatureID creID, int count, int3 pos);

	//get info
	virtual bool isVisitCoveredByAnotherQuery(const CGObjectInstance *obj, const CGHeroInstance *hero);

	friend struct CPack;
	friend struct CPackForClient;
	friend struct CPackForServer;
};