#pragma once

#include "TextureRef.h"

#include "util/G3DCore.h"

namespace RBX
{
class ContentId;
}

namespace G3D
{
class LightingParameters;
}

namespace RBX
{
namespace Graphics
{

class VisualEngine;
class DeviceContext;
class RenderCamera;
class GeometryBatch;
class VertexLayout;
class VertexBuffer;

class Sky
{
public:
	Sky(VisualEngine* visualEngine);
	~Sky();
    
    void update(const G3D::LightingParameters& lighting, int starCount, bool drawCelestialBodies);

    void prerender(); // call as early as possible, before the envmap update
    void render(DeviceContext* context, const RenderCamera& camera, bool drawStars = true);

	void setSkyBoxDefault();
	void setSkyBox(const ContentId& rt, const ContentId& lf, const ContentId& bk, const ContentId& ft, const ContentId& up, const ContentId& dn);
    bool isReady() const { return readyState; }

private:
    struct Star
	{
        Vector3 position;
        float intensity;
	};

    struct StarData
	{
        std::vector<Star> stars;
        scoped_ptr<GeometryBatch> batch;
		shared_ptr<VertexBuffer> buffer;

        void resize(Sky* sky, unsigned int count, bool dynamic);
        void reset();
	};

	enum Brightness
	{
		Brightness_Bright,
		Brightness_Dimmer,
		Brightness_Dim,
        Brightness_None
	};

    VisualEngine* visualEngine;

    shared_ptr<VertexLayout> layout;

    scoped_ptr<GeometryBatch> quad;

    TextureRef skyBox[6];
    TextureRef skyBoxLoading[6];

    Color3 skyColor;
    Color3 skyColor2;

    bool drawSunMoon;
    Vector3 sunPosition;
    Color4 sunColor;
    TextureRef sun;

    Vector3 moonPosition;
    Color4 moonColor;
    TextureRef moon;

	Brightness starLight;
    StarData starsNormal;
    StarData starsTwinkle;
    int starTwinkleCounter;
    bool readyState;

	void loadSkyBoxDefault(TextureRef* textures);
	void loadSkyBox(TextureRef* textures, const ContentId& rt, const ContentId& lf, const ContentId& bk, const ContentId& ft, const ContentId& up, const ContentId& dn);

	void createStarField(int starCount);
	void updateStarsNormal();
    void updateStarsTwinkle();
};

}
}