/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
**]  All rights reserved.
*
* vi:ts=4 sw=4 tw=75
*
* Distributable under the terms and conditions of the 2-clause BSD license;
* see the file COPYING for a complete text of the license.
*
**************************************************************************/

#ifndef _MOOF_AABB_HH_
#define _MOOF_AABB_HH_

#include <Moof/Cullable.hh>
#include <Moof/Drawable.hh>
#include <Moof/Math.hh>
#include <Moof/Plane.hh>
#include <Moof/Shape.hh>

#include <Moof/Frustum.hh>		// FIXME this file is quite broken
#include <Moof/OpenGL.hh>
#include <Moof/Texture.hh>


namespace Mf {


/**
 * Axis-aligned Bounding Box
 */

template <int D = 3>
struct Aabb : public Cullable, public Drawable, public Shape<D>
{
	typedef cml::vector< Scalar, cml::fixed<D> >	Vector;

	Vector min;
	Vector max;

	Aabb() {}

	Aabb(const Vector& a, const Vector& b)
	{
		init(a, b);
	}

	Aabb(Scalar ax, Scalar ay, Scalar az,
			Scalar bx, Scalar by, Scalar bz)
	{
		Vector a(ax, ay, az);
		Vector b(bx, by, bz);

		init(a, b);
	}

	void init(const Vector& a, const Vector& b)
	{
		if (a[0] < b[0])
		{
			min[0] = a[0];
			max[0] = b[0];
		}
		else
		{
			min[0] = b[0];
			max[0] = a[0];
		}
		if (a[1] < b[1])
		{
			min[1] = a[1];
			max[1] = b[1];
		}
		else
		{
			min[1] = b[1];
			max[1] = a[1];
		}
		if (a[2] < b[2])
		{
			min[2] = a[2];
			max[2] = b[2];
		}
		else
		{
			min[2] = b[2];
			max[2] = a[2];
		}
	}

	Vector getCenter() const
	{
		return Vector((min[0] + max[0]) / 2.0,
					   (min[1] + max[1]) / 2.0,
					   (min[2] + max[2]) / 2.0);
	}

	//void getOctant(Aabb& octant, int num) const;

	Plane getPlaneXY() const
	{
		Plane plane;
		plane.normal = Vector(0.0, 0.0, 1.0);
		plane.d = cml::dot(-plane.normal, getCenter());
		return plane;
	}

	Plane getPlaneXZ() const
	{
		Plane plane;
		plane.normal = Vector(0.0, 1.0, 0.0);
		plane.d = cml::dot(-plane.normal, getCenter());
		return plane;
	}

	Plane getPlaneYZ() const
	{
		Plane plane;
		plane.normal = Vector(1.0, 0.0, 0.0);
		plane.d = cml::dot(-plane.normal, getCenter());
		return plane;
	}

	/*
	void getCorners(Vector3 corners[8]) const;

	void encloseVertices(const Vector3 vertices[], unsigned count);

	void draw(Scalar alpha = 0.0) const;
	bool isVisible(const Frustum& frustum) const;
	*/


	void getCorners(Vector corners[8]) const
	{
		corners[0][0] = min[0];
		corners[0][1] = min[1];
		corners[0][2] = max[2];
		corners[1][0] = max[0];
		corners[1][1] = min[1];
		corners[1][2] = max[2];
		corners[2][0] = max[0];
		corners[2][1] = max[1];
		corners[2][2] = max[2];
		corners[3][0] = min[0];
		corners[3][1] = max[1];
		corners[3][2] = max[2];
		corners[4][0] = min[0];
		corners[4][1] = min[1];
		corners[4][2] = min[2];
		corners[5][0] = max[0];
		corners[5][1] = min[1];
		corners[5][2] = min[2];
		corners[6][0] = max[0];
		corners[6][1] = max[1];
		corners[6][2] = min[2];
		corners[7][0] = min[0];
		corners[7][1] = max[1];
		corners[7][2] = min[2];
	}


	void encloseVertices(const Vector vertices[], unsigned count)
	{
		min.zero();
		max.zero();

		for (unsigned i = 1; i < count; ++i)
		{
			min.minimize(vertices[i]);
			max.maximize(vertices[i]);
		}
	}


	void draw(Scalar alpha = 0.0) const
	{
		Scalar vertices[] = {min[0], min[1], min[2],
							 min[0], max[1], min[2],
							 max[0], max[1], min[2],
							 max[0], min[1], min[2],
							 min[0], max[1], max[2],
							 min[0], min[1], max[2],
							 max[0], min[1], max[2],
							 max[0], max[1], max[2]};

		GLubyte indices[] = {0, 1, 2, 3,
							 1, 2, 7, 4,
							 3, 0, 5, 6,
							 2, 3, 6, 7,
							 5, 0, 1, 4,
							 4, 5, 6, 7};

		glEnableClientState(GL_VERTEX_ARRAY);
		glDisableClientState(GL_TEXTURE_COORD_ARRAY);
		glVertexPointer(3, GL_SCALAR, 0, vertices);

		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		Texture::resetBind();

		glDrawElements(GL_QUADS, sizeof(indices), GL_UNSIGNED_BYTE,
					   indices);

		glEnableClientState(GL_TEXTURE_COORD_ARRAY);
		//glDisableClientState(GL_VERTEX_ARRAY);

		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
	}

	bool isVisible(const Frustum& frustum) const
	{
		return frustum.contains(*this);
	}
};


} // namespace Mf

#endif // _MOOF_AABB_HH_