/*
* HeroManager.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 "../AIUtility.h"

#include "../../../lib/GameConstants.h"
#include "../../../lib/VCMI_Lib.h"
#include "../../../lib/CTownHandler.h"
#include "../../../lib/CBuildingHandler.h"

namespace NKAI
{

class DLL_EXPORT IHeroManager //: public: IAbstractManager
{
public:
	virtual ~IHeroManager() = default;
	virtual const std::map<HeroPtr, HeroRole> & getHeroRoles() const = 0;
	virtual int selectBestSkill(const HeroPtr & hero, const std::vector<SecondarySkill> & skills) const = 0;
	virtual HeroRole getHeroRole(const HeroPtr & hero) const = 0;
	virtual void update() = 0;
	virtual float evaluateSecSkill(SecondarySkill skill, const CGHeroInstance * hero) const = 0;
	virtual float evaluateHero(const CGHeroInstance * hero) const = 0;
	virtual bool canRecruitHero(const CGTownInstance * t = nullptr) const = 0;
	virtual bool heroCapReached() const = 0;
	virtual const CGHeroInstance * findHeroWithGrail() const = 0;
	virtual const CGHeroInstance * findWeakHeroToDismiss(uint64_t armyLimit) const = 0;
	virtual float getMagicStrength(const CGHeroInstance * hero) const = 0;
};

class DLL_EXPORT ISecondarySkillRule
{
public:
	virtual ~ISecondarySkillRule() = default;
	virtual void evaluateScore(const CGHeroInstance * hero, SecondarySkill skill, float & score) const = 0;
};

class DLL_EXPORT SecondarySkillEvaluator
{
private:
	std::vector<std::shared_ptr<ISecondarySkillRule>> evaluationRules;

public:
	SecondarySkillEvaluator(std::vector<std::shared_ptr<ISecondarySkillRule>> evaluationRules);
	float evaluateSecSkills(const CGHeroInstance * hero) const;
	float evaluateSecSkill(const CGHeroInstance * hero, SecondarySkill skill) const;
};

class DLL_EXPORT HeroManager : public IHeroManager
{
private:
	static SecondarySkillEvaluator wariorSkillsScores;
	static SecondarySkillEvaluator scountSkillsScores;

	CCallback * cb; //this is enough, but we downcast from CCallback
	const Nullkiller * ai;
	std::map<HeroPtr, HeroRole> heroRoles;

public:
	HeroManager(CCallback * CB, const Nullkiller * ai) : cb(CB), ai(ai) {}
	const std::map<HeroPtr, HeroRole> & getHeroRoles() const override;
	HeroRole getHeroRole(const HeroPtr & hero) const override;
	int selectBestSkill(const HeroPtr & hero, const std::vector<SecondarySkill> & skills) const override;
	void update() override;
	float evaluateSecSkill(SecondarySkill skill, const CGHeroInstance * hero) const override;
	float evaluateHero(const CGHeroInstance * hero) const override;
	bool canRecruitHero(const CGTownInstance * t = nullptr) const override;
	bool heroCapReached() const override;
	const CGHeroInstance * findHeroWithGrail() const override;
	const CGHeroInstance * findWeakHeroToDismiss(uint64_t armyLimit) const override;
	float getMagicStrength(const CGHeroInstance * hero) const override;

private:
	float evaluateFightingStrength(const CGHeroInstance * hero) const;
	float evaluateSpeciality(const CGHeroInstance * hero) const;
	const CGTownInstance * findTownWithTavern() const;
};

// basic skill scores. missing skills will have score of 0
class DLL_EXPORT SecondarySkillScoreMap : public ISecondarySkillRule
{
private:
	std::map<SecondarySkill, float> scoreMap;

public:
	SecondarySkillScoreMap(std::map<SecondarySkill, float> scoreMap);
	void evaluateScore(const CGHeroInstance * hero, SecondarySkill skill, float & score) const override;
};

// Controls when to upgrade existing skills and when get new
class ExistingSkillRule : public ISecondarySkillRule
{
public:
	void evaluateScore(const CGHeroInstance * hero, SecondarySkill skill, float & score) const override;
};

// Allows to get wisdom at 12 lvl
class WisdomRule : public ISecondarySkillRule
{
public:
	void evaluateScore(const CGHeroInstance * hero, SecondarySkill skill, float & score) const override;
};

// Dynamically controls scores for magic skills
class AtLeastOneMagicRule : public ISecondarySkillRule
{
private:
	static std::vector<SecondarySkill> magicSchools;

public:
	void evaluateScore(const CGHeroInstance * hero, SecondarySkill skill, float & score) const override;
};

}