SabrehavenServer/src/combat.h

/**
 * Tibia GIMUD Server - a free and open-source MMORPG server emulator
 * Copyright (C) 2019 Sabrehaven and Mark Samman <mark.samman@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef FS_COMBAT_H_B02CE79230FC43708699EE91FCC8F7CC
#define FS_COMBAT_H_B02CE79230FC43708699EE91FCC8F7CC

#include "thing.h"
#include "condition.h"
#include "map.h"
#include "baseevents.h"

class Condition;
class Creature;
class Item;

struct Position;

//for luascript callback
class ValueCallback final : public CallBack
{
	public:
		explicit ValueCallback(formulaType_t type): type(type) {}
		void getMinMaxValues(Player* player, CombatDamage& damage, bool useCharges) const;

	protected:
		formulaType_t type;
};

class TileCallback final : public CallBack
{
	public:
		void onTileCombat(Creature* creature, Tile* tile) const;

	protected:
		formulaType_t type;
};

class TargetCallback final : public CallBack
{
	public:
		void onTargetCombat(Creature* creature, Creature* target) const;

	protected:
		formulaType_t type;
};

struct CombatParams {
	std::forward_list<std::unique_ptr<const Condition>> conditionList;

	std::unique_ptr<ValueCallback> valueCallback;
	std::unique_ptr<TileCallback> tileCallback;
	std::unique_ptr<TargetCallback> targetCallback;

	uint16_t itemId = 0;
	uint16_t decreaseDamage = 0;
	uint16_t maximumDecreasedDamage = 0;

	ConditionType_t dispelType = CONDITION_NONE;
	CombatType_t combatType = COMBAT_NONE;
	CombatOrigin origin = ORIGIN_SPELL;

	uint8_t impactEffect = CONST_ME_NONE;
	uint8_t distanceEffect = CONST_ANI_NONE;

	bool blockedByArmor = false;
	bool blockedByShield = false;
	bool targetCasterOrTopMost = false;
	bool aggressive = true;
	bool useCharges = false;
};

struct Impact
{
	Creature* actor = nullptr;

	virtual void handleCreature(Creature*) {
		//
	}
};

struct DamageImpact : Impact
{
	CombatParams params;
	CombatDamage damage;

	void handleCreature(Creature* target) final;
};

struct SpeedImpact : Impact
{
	int32_t percent = 0;
	int32_t duration = 0;

	void handleCreature(Creature* target) final;
};

struct DunkenImpact : Impact
{
	int32_t duration = 0;

	void handleCreature(Creature* target) final;
};

typedef void(*COMBATFUNC)(Creature*, Creature*, const CombatParams&, CombatDamage*);

class MatrixArea
{
	public:
		MatrixArea(uint32_t rows, uint32_t cols): centerX(0), centerY(0), rows(rows), cols(cols) {
			data_ = new bool*[rows];

			for (uint32_t row = 0; row < rows; ++row) {
				data_[row] = new bool[cols];

				for (uint32_t col = 0; col < cols; ++col) {
					data_[row][col] = 0;
				}
			}
		}

		MatrixArea(const MatrixArea& rhs) {
			centerX = rhs.centerX;
			centerY = rhs.centerY;
			rows = rhs.rows;
			cols = rhs.cols;

			data_ = new bool*[rows];

			for (uint32_t row = 0; row < rows; ++row) {
				data_[row] = new bool[cols];

				for (uint32_t col = 0; col < cols; ++col) {
					data_[row][col] = rhs.data_[row][col];
				}
			}
		}

		~MatrixArea() {
			for (uint32_t row = 0; row < rows; ++row) {
				delete[] data_[row];
			}

			delete[] data_;
		}

		// non-assignable
		MatrixArea& operator=(const MatrixArea&) = delete;

		void setValue(uint32_t row, uint32_t col, bool value) const {
			data_[row][col] = value;
		}
		bool getValue(uint32_t row, uint32_t col) const {
			return data_[row][col];
		}

		void setCenter(uint32_t y, uint32_t x) {
			centerX = x;
			centerY = y;
		}
		void getCenter(uint32_t& y, uint32_t& x) const {
			x = centerX;
			y = centerY;
		}

		uint32_t getRows() const {
			return rows;
		}
		uint32_t getCols() const {
			return cols;
		}

		inline const bool* operator[](uint32_t i) const {
			return data_[i];
		}
		inline bool* operator[](uint32_t i) {
			return data_[i];
		}

	protected:
		uint32_t centerX;
		uint32_t centerY;

		uint32_t rows;
		uint32_t cols;
		bool** data_;
};

class AreaCombat
{
	public:
		AreaCombat() = default;

		AreaCombat(const AreaCombat& rhs);
		~AreaCombat() {
			clear();
		}

		// non-assignable
		AreaCombat& operator=(const AreaCombat&) = delete;

		void getList(const Position& centerPos, const Position& targetPos, std::forward_list<Tile*>& list) const;

		void setupArea(const std::list<uint32_t>& list, uint32_t rows);
		void setupArea(int32_t length, int32_t spread);
		void setupArea(int32_t radius);
		void setupExtArea(const std::list<uint32_t>& list, uint32_t rows);
		void clear();

	protected:
		enum MatrixOperation_t {
			MATRIXOPERATION_COPY,
			MATRIXOPERATION_MIRROR,
			MATRIXOPERATION_FLIP,
			MATRIXOPERATION_ROTATE90,
			MATRIXOPERATION_ROTATE180,
			MATRIXOPERATION_ROTATE270,
		};

		MatrixArea* createArea(const std::list<uint32_t>& list, uint32_t rows);
		void copyArea(const MatrixArea* input, MatrixArea* output, MatrixOperation_t op) const;

		MatrixArea* getArea(const Position& centerPos, const Position& targetPos) const {
			int32_t dx = Position::getOffsetX(targetPos, centerPos);
			int32_t dy = Position::getOffsetY(targetPos, centerPos);

			Direction dir;
			if (dx < 0) {
				dir = DIRECTION_WEST;
			} else if (dx > 0) {
				dir = DIRECTION_EAST;
			} else if (dy < 0) {
				dir = DIRECTION_NORTH;
			} else {
				dir = DIRECTION_SOUTH;
			}

			if (hasExtArea) {
				if (dx < 0 && dy < 0) {
					dir = DIRECTION_NORTHWEST;
				} else if (dx > 0 && dy < 0) {
					dir = DIRECTION_NORTHEAST;
				} else if (dx < 0 && dy > 0) {
					dir = DIRECTION_SOUTHWEST;
				} else if (dx > 0 && dy > 0) {
					dir = DIRECTION_SOUTHEAST;
				}
			}

			auto it = areas.find(dir);
			if (it == areas.end()) {
				return nullptr;
			}
			return it->second;
		}

		std::map<Direction, MatrixArea*> areas;
		bool hasExtArea = false;
};

class Combat
{
	public:
		Combat() = default;

		// non-copyable
		Combat(const Combat&) = delete;
		Combat& operator=(const Combat&) = delete;

		static int32_t computeDamage(Creature* creature, int32_t strength, int32_t variation);
		static int32_t getTotalDamage(int32_t attackSkill, int32_t attackValue, fightMode_t fightMode);

		static bool attack(Creature* attacker, Creature* target);
		static bool closeAttack(Creature* attacker, Creature* target, fightMode_t fightMode);
		static bool rangeAttack(Creature* attacker, Creature* target, fightMode_t fightMode);

		static void circleShapeSpell(Creature* attacker, const Position& toPos, int32_t range, int32_t animation, int32_t radius, DamageImpact* impact, int32_t effect);

		static void getAttackValue(Creature* creature, uint32_t& attackValue, uint32_t& skillValue, uint8_t& skill);

		static bool doCombatHealth(Creature* caster, Creature* target, CombatDamage& damage, const CombatParams& params);
		static void doCombatHealth(Creature* caster, const Position& position, const AreaCombat* area, CombatDamage& damage, const CombatParams& params);

		static void doCombatMana(Creature* caster, Creature* target, CombatDamage& damage, const CombatParams& params);
		static void doCombatMana(Creature* caster, const Position& position, const AreaCombat* area, CombatDamage& damage, const CombatParams& params);

		static void doCombatCondition(Creature* caster, Creature* target, const CombatParams& params);
		static void doCombatCondition(Creature* caster, const Position& position, const AreaCombat* area, const CombatParams& params);

		static void doCombatDispel(Creature* caster, Creature* target, const CombatParams& params);
		static void doCombatDispel(Creature* caster, const Position& position, const AreaCombat* area, const CombatParams& params);

		static void getCombatArea(const Position& centerPos, const Position& targetPos, const AreaCombat* area, std::forward_list<Tile*>& list);

		static bool isInPvpZone(const Creature* attacker, const Creature* target);
		static bool isProtected(const Player* attacker, const Player* target);
		static bool isPlayerCombat(const Creature* target);
		static CombatType_t ConditionToDamageType(ConditionType_t type);
		static ConditionType_t DamageToConditionType(CombatType_t type);
		static ReturnValue canTargetCreature(Player* attacker, Creature* target);
		static ReturnValue canDoCombat(Creature* caster, Tile* tile, bool aggressive);
		static ReturnValue canDoCombat(Creature* attacker, Creature* target);
		static void postCombatEffects(Creature* caster, const Position& pos, const CombatParams& params);

		static void addDistanceEffect(const Position& fromPos, const Position& toPos, uint8_t effect);

		void doCombat(Creature* caster, Creature* target) const;
		void doCombat(Creature* caster, const Position& pos) const;

		bool setCallback(CallBackParam_t key);
		CallBack* getCallback(CallBackParam_t key);

		bool setParam(CombatParam_t param, uint32_t value);
		void setArea(AreaCombat* area) {
			this->area.reset(area);
		}
		bool hasArea() const {
			return area != nullptr;
		}
		void setCondition(const Condition* condition) {
			params.conditionList.emplace_front(condition);
		}
		void setPlayerCombatValues(formulaType_t formulaType, double mina, double minb, double maxa, double maxb);
		void postCombatEffects(Creature* caster, const Position& pos) const {
			postCombatEffects(caster, pos, params);
		}

		void setOrigin(CombatOrigin origin) {
			params.origin = origin;
		}

	protected:
		static bool canUseWeapon(Player* player, Item* weapon);
		static void postWeaponEffects(Player* player, Item* weapon);

		static void doCombatDefault(Creature* caster, Creature* target, const CombatParams& params);

		static void CombatFunc(Creature* caster, const Position& pos, const AreaCombat* area, const CombatParams& params, COMBATFUNC func, CombatDamage* data);

		static void CombatHealthFunc(Creature* caster, Creature* target, const CombatParams& params, CombatDamage* data);
		static void CombatManaFunc(Creature* caster, Creature* target, const CombatParams& params, CombatDamage* damage);
		static void CombatConditionFunc(Creature* caster, Creature* target, const CombatParams& params, CombatDamage* data);
		static void CombatDispelFunc(Creature* caster, Creature* target, const CombatParams& params, CombatDamage* data);
		static void CombatNullFunc(Creature* caster, Creature* target, const CombatParams& params, CombatDamage* data);

		static void combatTileEffects(const SpectatorVec& list, Creature* caster, Tile* tile, const CombatParams& params);
		CombatDamage getCombatDamage(Creature* creature) const;

		//configureable
		CombatParams params;

		//formula variables
		formulaType_t formulaType = COMBAT_FORMULA_UNDEFINED;
		double mina = 0.0;
		double minb = 0.0;
		double maxa = 0.0;
		double maxb = 0.0;

		std::unique_ptr<AreaCombat> area;
};

class MagicField final : public Item
{
	public:
		explicit MagicField(uint16_t type) : Item(type), createTime(OTSYS_TIME()) {}

		MagicField* getMagicField() final {
			return this;
		}
		const MagicField* getMagicField() const final {
			return this;
		}

		bool isReplaceable() const {
			return Item::items[getID()].replaceable;
		}
		CombatType_t getCombatType() const {
			const ItemType& it = items[getID()];
			return it.combatType;
		}
		void onStepInField(Creature* creature);

	private:
		int64_t createTime;
};

#endif