#include "cCollision.hpp"

using MathEngine::cCollision;
using MathEngine::Vector4;
using MathEngine::Vector2;
using MathEngine::iVector4;
using MathEngine::iVector2;

cCollision::cCollision()
{
}

cCollision::~cCollision()
{
}

/// Functions
/*static*/ const bool cCollision::BoundingBox( const SDL_Rect& a, const SDL_Rect& b )
{
	if ((b.x + b.w) < a.x)
		return false;	//just checking if their
	if ((a.x + a.w) < b.x )	
		return false;	//bounding boxes even touch

	if ((b.y + b.h) < a.y)	
		return false;
	if ((a.y + a.h) < b.y)	
		return false;

	return true;				//bounding boxes intersect
}

/*static*/ const bool cCollision::BoundingBox( const Vector4& a, const Vector4& b )
{
	if ((b.x + b.z) < a.x)
		return false;	//just checking if their
	if ((a.x + a.z) < b.x )	
		return false;	//bounding boxes even touch

	if ((b.y + b.w) < a.y)	
		return false;
	if ((a.y + a.w) < b.y)	
		return false;

	return true;				//bounding boxes intersect
}

/*static*/ const bool cCollision::BoundingBox( const SDL_Rect& a, const Vector4& b )
{
	Vector4 temp = a;

	return cCollision::BoundingBox(temp, b);
}

/*static*/ const bool cCollision::BoundingBox( const Vector4& a, const SDL_Rect& b )
{
	return cCollision::BoundingBox(b, a);
}

/*static*/ const bool cCollision::BoundingBox( const iVector4& a, const iVector4& b )
{
	if ((b.x + b.z) < a.x)
		return false;	//just checking if their
	if ((a.x + a.z) < b.x )	
		return false;	//bounding boxes even touch

	if ((b.y + b.w) < a.y)	
		return false;
	if ((a.y + a.w) < b.y)	
		return false;

	return true;				//bounding boxes intersect
}

/*static*/ const bool cCollision::BoundingBox( const SDL_Rect& a, const iVector4& b )
{
	iVector4 temp = a;

	return cCollision::BoundingBox(temp, b);
}

/*static*/ const bool cCollision::BoundingBox( const iVector4& a, const SDL_Rect& b )
{
	return cCollision::BoundingBox(b, a);
}

/*static*/ const bool cCollision::BoundingBox( const iVector4& a, const Vector4& b )
{
	Vector4 temp = a;
	
	return cCollision::BoundingBox( temp, b );
}

/*static*/ const bool cCollision::BoundingBox( const Vector4& a, const iVector4& b )
{
	return cCollision::BoundingBox( b, a );
}

/*static*/ const Vector2 cCollision::Inside( const SDL_Rect& a, const SDL_Rect& b )
{
	Vector2 rtn;
	rtn.x = 0.0f;
	rtn.y = 0.0f;

	//Check if left side of b is inside of a
	if (b.x < a.x)
		rtn.x = (float)(b.x - a.x);
	//Check if right side of b is inside of a
	if ((b.x + b.w) > (a.x + a.w))
		rtn.x = (float)((b.x + b.w) - (a.x + a.w));
	//Check if top side of b is inside of a
	if (b.y < a.y)
		rtn.y = (float)(b.y - a.y);
	//Check if botton side of b is inside of a
	if ((b.y + b.h) > (a.y + a.h))
		rtn.y = (float)((b.y + b.h) - (a.y + a.h));

	return rtn;	
}

/*static*/ const Vector2 cCollision::Inside( const Vector4& a, const Vector4& b )
{
	Vector2 rtn;
	rtn.x = 0.0f;
	rtn.y = 0.0f;

	//Check if left side of b is inside of a
	if (b.x < a.x)
		rtn.x = a.x - b.x;
	//Check if right side of b is inside of a
	if ((b.x + b.z) > (a.x + a.z))
		rtn.x = (a.x + a.z) - (b.x + b.z);
	//Check if top side of b is inside of a
	if (b.y < a.y)
		rtn.y = a.y - b.y;
	//Check if botton side of b is inside of a
	if ((b.y + b.w) > (a.y + a.w))
		rtn.y = (a.y + a.w) - (b.y + b.w);

	return rtn;	
}

/*static*/ const Vector2 cCollision::Inside( const SDL_Rect& a, const Vector4& b )
{
	Vector4 temp = a;

	return cCollision::Inside(temp, b);
}

/*static*/ const Vector2 cCollision::Inside( const Vector4& a, const SDL_Rect& b )
{
	Vector4 temp = b;

	return cCollision::Inside(a, temp);
}

/*static*/ const iVector2 cCollision::Inside( const iVector4& a, const iVector4& b )
{
	iVector2 rtn;
	rtn.x = 0;
	rtn.y = 0;

	//Check if left side of b is inside of a
	if (b.x < a.x)
		rtn.x = b.x - a.x;
	//Check if right side of b is inside of a
	if ((b.x + b.z) > (a.x + a.z))
		rtn.x = (b.x + b.z) - (a.x + a.z);
	//Check if top side of b is inside of a
	if (b.y < a.y)
		rtn.y = b.y - a.y;
	//Check if botton side of b is inside of a
	if ((b.y + b.w) > (a.y + a.w))
		rtn.y = (b.y + b.w) - (a.y + a.w);

	return rtn;
}

/*static*/ const iVector2 cCollision::Inside( const SDL_Rect& a, const iVector4& b )
{
	iVector4 temp = a;

	return cCollision::Inside( temp, b );
}

/*static*/ const iVector2 cCollision::Inside( const iVector4& a, const SDL_Rect& b )
{
	return cCollision::Inside( b, a );
}

/*static*/ const Vector2 cCollision::Inside( const iVector4& a, const Vector4& b )
{
	Vector4 temp = a;

	return cCollision::Inside( temp, b );
}

/*static*/ const Vector2 cCollision::Inside( const Vector4& a, const iVector4& b )
{
	return cCollision::Inside( b, a );
}