#ifndef __PLANETINDEXBUFFER_H__
#define __PLANETINDEXBUFFER_H__

#include "util/Common.h"

enum Direction
{
	TOP, RIGHT,
	BOTTOM, LEFT,
};


typedef std::vector<GLushort>    TriangleFan;
typedef std::vector<TriangleFan> TriangleFanList;

class PlanetIndexBuffer {
	public:
		PlanetIndexBuffer(unsigned int resolution, const unsigned int detailTop, const unsigned int detailRight, const unsigned int detailBottom, const unsigned int detailLeft);
		~PlanetIndexBuffer();
		
    // Instance methods
    GLsizei getVertexCount() const;
    GLuint  getIbo() const;
	private:
		void rotateIndices(unsigned int &x, unsigned int &y, const unsigned int rotation);
    void addTriangleFan(TriangleFanList &triangleFans);
    void addTriangleFanVertex(TriangleFanList &triangleFans, unsigned int x, unsigned int y, const unsigned int rotation = 0);
    void buildEdge(TriangleFanList &triangleFans, const unsigned int side, const unsigned int detail = 0);

    // Instance variables
    GLsizei m_vertexCount;
    GLuint  m_ibo;

		// TODO: move to utility
		unsigned int index1D(const unsigned int x, const unsigned int y);

		unsigned int m_resolution;
};

#endif // __PLANETINDEXBUFFER_H__