#pragma once

#include "Core.h"
#include "Texture.h"


struct RenderBuffer
{

	unsigned int ID;

	void Create()
	{
		glGenRenderbuffers(1, &ID);
	}

	~RenderBuffer()
	{
		glDeleteRenderbuffers(1, &ID);
	}
	void Bind()
	{
		glBindRenderbuffer(GL_RENDERBUFFER, ID);
	}

	void Storage(unsigned int internalFormat, int width, int height)
	{
		glBindRenderbuffer(GL_RENDERBUFFER, ID);
		glRenderbufferStorage(GL_RENDERBUFFER, internalFormat, width, height);
		glBindRenderbuffer(GL_RENDERBUFFER, 0);
	}
	void StorageMultiSample(unsigned int samples, unsigned int internalFormat, int width, int height)
	{
		glBindRenderbuffer(GL_RENDERBUFFER, ID);
		glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples, internalFormat, width, height);
	}
};

struct FrameBuffer
{
	unsigned int FBO;

	void BufferTextureLayer(unsigned int attachment, unsigned int texId, int level, int layer)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glFramebufferTextureLayer(GL_FRAMEBUFFER, attachment, texId, level, layer);
	}


	void BufferTexture2D(unsigned int attachment, unsigned int texTarget, unsigned int ID, unsigned int mipLevel = 0)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, texTarget, ID, mipLevel);
	}

	void BufferTextureLayer(unsigned int attachment, unsigned int tex, unsigned int mipLevel, unsigned int zOff)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glFramebufferTextureLayer(GL_FRAMEBUFFER, attachment, tex, mipLevel, zOff);
	}


	void RenderBuffer(unsigned int attachment, unsigned int RBO)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glBindRenderbuffer(GL_RENDERBUFFER, RBO);
		glFramebufferRenderbuffer(GL_FRAMEBUFFER, attachment, GL_RENDERBUFFER, RBO);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);

	}
	void ReadBuffer(unsigned int attachment)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, this->FBO);
		glReadBuffer(attachment);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);

	}

	void DrawBuffers(unsigned int* attachments,int num)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glDrawBuffers(num, attachments);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);

	}
	void Create()
	{
		glDeleteFramebuffers(1, &FBO);
		glGenFramebuffers(1, &FBO);
	}

	void CheckError()
	{
		// - Finally check if framebuffer is complete
		if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
			LOGI("Framebuffer not complete!");
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}

	void Bind()
	{
		glBindFramebuffer(GL_FRAMEBUFFER, this->FBO);
	}

#ifdef WIN32

	void BufferTexture(unsigned int attachment, unsigned int texId, int level)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glFramebufferTexture(GL_FRAMEBUFFER, attachment, texId, level);
	}

	void BufferTexture3D(unsigned int attachment, unsigned int texTarget, unsigned int tex, unsigned int mipLevel, unsigned int zOff)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, FBO);
		glFramebufferTexture3D(GL_FRAMEBUFFER, attachment, texTarget, tex, mipLevel, zOff);
	}
#endif // DEBUG

	~FrameBuffer()
	{
		if (FBO)
		{
			glDeleteFramebuffers(1, &FBO);
			FBO = 0;
		}
	}
	static void UnBind()
	{
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}
};

//struct DepthMapDesc
//{
//	int width, height;
//
//};
//
//struct DepthMap
//{
//	unsigned int ID;
//	int width, height;
//	bool CreateFromDesc(const DepthMapDesc& desc)
//	{
//		glGenFramebuffers(1, &ID);
//		// create depth texture
//		unsigned int depthMap;
//		glGenTextures(1, &depthMap);
//		glBindTexture(GL_TEXTURE_2D, depthMap);
//		glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
//			desc.width, desc.height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
//		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
//		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
//		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
//		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
//		// attach depth texture as FBO's depth buffer
//		glBindFramebuffer(GL_FRAMEBUFFER, ID);
//		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
//		glDrawBuffer(GL_NONE);
//		glReadBuffer(GL_NONE);
//		glBindFramebuffer(GL_FRAMEBUFFER, 0);
//
//		return true;
//	}
//	void Bind()
//	{
//		glBindFramebuffer(GL_FRAMEBUFFER, this->ID);
//		glViewport(0, 0, width, height);
//	}
//	void UnBind()
//	{
//		glBindFramebuffer(GL_FRAMEBUFFER, 0);
//	}
//};