//	HomingBullet.h - Class which makes the bullet home in on the nearest tank.
//  ----------------------------------------------------------------------------
//	This file is part of 'NiallsAVLib', base code for any kind of audiovisual
//	apps.
//	Copyright (C) 2012  Niall Moody
//	
//	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 3 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, see <http://www.gnu.org/licenses/>.
//	----------------------------------------------------------------------------

#ifndef HOMINGBULLET_H_
#define HOMINGBULLET_H_

#include "BulletModifiers.h"
#include "ModifierCreator.h"

//------------------------------------------------------------------------------
///	Class which makes the bullet home in on the nearest tank.
class HomingBullet : public BulletDirectionModifier
{
  public:
	///	Constructor.
	HomingBullet();
	///	Destructor.
	~HomingBullet();

	///	Called for every frame in the Bullet's update() method.
	void alterDirection(TwoFloats& dir,
						Bullet& bullet,
						GamePlayState& state);

	///	Used to create this modifier.
	static BulletDirectionCreator<HomingBullet> creator;
  private:
	///	The spiral applies more strongly the longer things go on.
	float strength;
	///	How much strength increments as time goes on.
	float strengthInc;
};

//------------------------------------------------------------------------------
///	The modifier creator for HomingBullet.
class HomingBulletCreator : public ModifierCreator
{
  public:
	///	Constructor.
	HomingBulletCreator():
	ModifierCreator(1)
	{
	
	};
	///	Destructor.
	~HomingBulletCreator() {};

	///	Applies the modifier.
	void apply(GamePlayState& state);

	///	Returns the name of this modifier.
	const std::wstring getName() const {return L"Homing shots!";};
	///	If this modifier depends on another modifier being active, this returns that modifier's name.
	std::wstring getDependency() const {return L"";};
	///	Returns this modifier's difficulty (in terms of being hard to handle).
	int getGrade() const {return 3;};
};

#endif
