// ==============================================================
//	This file is part of Glest (www.glest.org)
//
//	Copyright (C) 2001-2008 Martiño Figueroa
//
//	You can redistribute this code 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
// ==============================================================

#ifndef _GLEST_GAME_AI_H_
#define _GLEST_GAME_AI_H_

#include <vector>
#include <list>

#include "world.h"
#include "commander.h"
#include "command.h"
#include "random.h"

using std::deque;
using std::vector;
using std::list;
using Shared::Util::Random;

namespace Glest{ namespace Game{

class AiInterface;
class AiRule;

// =====================================================
// 	class Task  
//
///	An action that has to be performed by the IA
// =====================================================

enum TaskClass{
	tcProduce,
	tcBuild,
	tcUpgrade
};	

class Task{
protected:
	TaskClass taskClass;	

public:
	virtual ~Task(){}
	TaskClass getClass() const	{return taskClass;}
	virtual string toString() const= 0;
};

// ==================== ProduceTask ====================

class ProduceTask: public Task{
private:
	UnitClass unitClass;
	const UnitType *unitType;
	const ResourceType *resourceType;

public:
	ProduceTask(UnitClass unitClass);
	ProduceTask(const UnitType *unitType);
	ProduceTask(const ResourceType *resourceType);
	
	UnitClass getUnitClass() const					{return unitClass;} 
	const UnitType *getUnitType() const				{return unitType;}
	const ResourceType *getResourceType() const		{return resourceType;}
	virtual string toString() const;
};

// ==================== BuildTask ====================

class BuildTask: public Task{
private:
	const UnitType *unitType;
	const ResourceType *resourceType;
	bool forcePos;
	Vec2i pos;

public:
	BuildTask(const UnitType *unitType= NULL);
	BuildTask(const ResourceType *resourceType);
	BuildTask(const UnitType *unitType, const Vec2i &pos);

	const UnitType *getUnitType() const			{return unitType;}
	const ResourceType *getResourceType() const	{return resourceType;}
	bool getForcePos() const					{return forcePos;}
	Vec2i getPos() const						{return pos;}
	virtual string toString() const;
};

// ==================== UpgradeTask ====================

class UpgradeTask: public Task{
private:
	const UpgradeType *upgradeType;

public:
	UpgradeTask(const UpgradeType *upgradeType= NULL);
	const UpgradeType *getUpgradeType() const	{return upgradeType;}
	virtual string toString() const;
};

// ===============================
// 	class AI 
//
///	Main AI class
// ===============================

class Ai{
private:
	static const int harvesterPercent= 30;
	static const int maxBuildRadius= 40; 
	static const int minMinWarriors= 7;
	static const int maxMinWarriors= 20;
	static const int minStaticResources= 10;
	static const int minConsumableResources= 20;
	static const int maxExpansions= 2;
	static const int villageRadius= 15;

public:
	enum ResourceUsage{
		ruHarvester,
		ruWarrior,
		ruBuilding,
		ruUpgrade
	};

private:
	typedef vector<AiRule*> AiRules;
	typedef list<const Task*> Tasks;
	typedef deque<Vec2i> Positions;

private:
    AiInterface *aiInterface;
	AiRules aiRules;
    int startLoc;
	int upgradeCount;
	int minWarriors;
	Tasks tasks;
	Positions expansionPositions;
	Random random;

public: 
    ~Ai();
	void init(AiInterface *aiInterface);
    void update(); 

    //state requests
	AiInterface *getAiInterface() const		{return aiInterface;}
	Random* getRandom()						{return &random;}
    int getCountOfType(const UnitType *ut);
	
	int getCountOfClass(UnitClass uc);
	float getRatioOfClass(UnitClass uc);

	const ResourceType *getNeededResource();
	bool isStableBase();
	bool findPosForBuilding(const UnitType* building, const Vec2i &searchPos, Vec2i &pos);
	bool findAbleUnit(int *unitIndex, CommandClass ability, bool idleOnly);
	bool findAbleUnit(int *unitIndex, CommandClass ability, CommandClass currentCommand);
	bool beingAttacked(Vec2i &pos, Field &field, int radius);

	//tasks
	void addTask(const Task *task);
	void addPriorityTask(const Task *task);
	bool anyTask();
	const Task *getTask() const;
	void removeTask(const Task *task);
	void retryTask(const Task *task);

	//expansions
	void addExpansion(const Vec2i &pos);
	Vec2i getRandomHomePosition();

    //actions
    void sendScoutPatrol();
    void massiveAttack(const Vec2i &pos, Field field, bool ultraAttack= false);
    void returnBase(int unitIndex);
    void harvest(int unitIndex);
};

}}//end namespace

#endif