/*
 * 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
 *
 */
#pragma once

#include <vcmi/Metatype.h>

#include "CGameInfoCallback.h" // for CGameInfoCallback
#include "CRandomGenerator.h"

VCMI_LIB_NAMESPACE_BEGIN

struct SetMovePoints;
struct GiveBonus;
struct BlockingDialog;
struct TeleportDialog;
class MetaString;
struct StackLocation;
struct ArtifactLocation;
class CCreatureSet;
class CStackBasicDescriptor;
class CGCreature;

namespace spells
{
	class Caster;
}

#if SCRIPTING_ENABLED
namespace scripting
{
	class Pool;
}
#endif


class DLL_LINKAGE CPrivilegedInfoCallback : public CGameInfoCallback
{
public:
	enum class MapTerrainFilterMode
	{
		NONE = 0,
		LAND = 1,
		WATER = 2,
		LAND_CARTOGRAPHER = 3,
		UNDERGROUND_CARTOGRAPHER = 4
	};

	CGameState *gameState();

	//used for random spawns
	void getFreeTiles(std::vector<int3> &tiles) const;

	//mode 1 - only unrevealed tiles; mode 0 - all, mode -1 -  only revealed
	void getTilesInRange(std::unordered_set<int3> & tiles,
						 const int3 & pos,
						 int radious,
						 std::optional<PlayerColor> player = std::optional<PlayerColor>(),
						 int mode = 0,
						 int3::EDistanceFormula formula = int3::DIST_2D) const;

	//returns all tiles on given level (-1 - both levels, otherwise number of level)
	void getAllTiles(std::unordered_set<int3> &tiles, std::optional<PlayerColor> player = std::optional<PlayerColor>(),
					 int level = -1, MapTerrainFilterMode tileFilterMode = MapTerrainFilterMode::NONE) const;

	//gives 3 treasures, 3 minors, 1 major -> used by Black Market and Artifact Merchant
	void pickAllowedArtsSet(std::vector<const CArtifact *> & out, CRandomGenerator & rand) const; 
	void getAllowedSpells(std::vector<SpellID> &out, std::optional<ui16> level = std::nullopt);

	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 IGameEventCallback
{
public:
	virtual void setObjProperty(ObjectInstanceID objid, int prop, si64 val) = 0;

	virtual void showInfoDialog(InfoWindow * iw) = 0;
	virtual void showInfoDialog(const std::string & msg, PlayerColor player) = 0;

	virtual void changeSpells(const CGHeroInstance * hero, bool give, const std::set<SpellID> &spells)=0;
	virtual bool removeObject(const CGObjectInstance * obj)=0;
	virtual void createObject(const int3 & visitablePosition, Obj type, int32_t subtype = 0) = 0;
	virtual void setOwner(const CGObjectInstance * objid, PlayerColor owner)=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 showTeleportDialog(TeleportDialog *iw) =0;
	virtual void showThievesGuildWindow(PlayerColor player, ObjectInstanceID requestingObjId) =0;
	virtual void giveResource(PlayerColor player, GameResID 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, const 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 bool giveHeroNewArtifact(const CGHeroInstance * h, const CArtifact * artType, ArtifactPosition pos) = 0;
	virtual bool giveHeroArtifact(const CGHeroInstance * h, const CArtifactInstance * a, ArtifactPosition pos) = 0;
	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 heroVisitCastle(const CGTownInstance * obj, const CGHeroInstance * hero)=0;
	virtual void visitCastleObjects(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 bool moveHero(ObjectInstanceID hid, int3 dst, ui8 teleporting, bool transit = false, PlayerColor asker = PlayerColor::NEUTRAL)=0;
	virtual bool swapGarrisonOnSiege(ObjectInstanceID tid)=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, ObjectInstanceID boatId = ObjectInstanceID()) = 0;
	virtual void changeObjPos(ObjectInstanceID objid, int3 newPos)=0;
	virtual void sendAndApply(CPackForClient * pack) = 0;
	virtual void heroExchange(ObjectInstanceID hero1, ObjectInstanceID hero2)=0; //when two heroes meet on adventure map
	virtual void changeFogOfWar(int3 center, ui32 radius, PlayerColor player, bool hide) = 0;
	virtual void changeFogOfWar(std::unordered_set<int3> &tiles, PlayerColor player, bool hide) = 0;
	
	virtual void castSpell(const spells::Caster * caster, SpellID spellID, const int3 &pos) = 0;
};

class DLL_LINKAGE CNonConstInfoCallback : public CPrivilegedInfoCallback
{
public:
	//keep const version of callback accessible
	using CGameInfoCallback::getPlayerState;
	using CGameInfoCallback::getTeam;
	using CGameInfoCallback::getPlayerTeam;
	using CGameInfoCallback::getHero;
	using CGameInfoCallback::getTown;
	using CGameInfoCallback::getTile;
	using CGameInfoCallback::getArtInstance;
	using CGameInfoCallback::getObjInstance;

	PlayerState * getPlayerState(const PlayerColor & color, bool verbose = true);
	TeamState * getTeam(const TeamID & teamID); //get team by team ID
	TeamState * getPlayerTeam(const PlayerColor & color); // get team by player color
	CGHeroInstance * getHero(const ObjectInstanceID & objid);
	CGTownInstance * getTown(const ObjectInstanceID & objid);
	TerrainTile * getTile(const int3 & pos);
	CArtifactInstance * getArtInstance(const ArtifactInstanceID & aid);
	CGObjectInstance * getObjInstance(const ObjectInstanceID & oid);
	CArmedInstance * getArmyInstance(const ObjectInstanceID & oid);

	virtual void updateEntity(Metatype metatype, int32_t index, const JsonNode & data) = 0;
};

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

#if SCRIPTING_ENABLED
	virtual scripting::Pool * getGlobalContextPool() const = 0;
#endif

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

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


VCMI_LIB_NAMESPACE_END
