#include "Rendering/FrameBuffer.h"


BufferResource::BufferResource(GLuint* resourceHandle, GLenum resourceType, GLenum attachment)
{
    m_ResourceHandle = resourceHandle;
    m_ResourceType = resourceType;
    m_Attachment = attachment;
}

Texture2D::~Texture2D()
{
    if (m_ResourceHandle != 0) {
        glDeleteTextures(1, m_ResourceHandle);
    }
}


RenderBuffer::~RenderBuffer()
{
    if (m_ResourceHandle != 0) {
        glDeleteRenderbuffers(1, m_ResourceHandle);
    }
}


FrameBuffer::~FrameBuffer()
{
    if (m_BufferHandle != 0) {
        glDeleteFramebuffers(1, &m_BufferHandle);
    }
}

void FrameBuffer::AddResource(std::shared_ptr<BufferResource> resource)
{
    m_Resources.push_back(resource);
}

void FrameBuffer::Generate()
{
    GLERROR("PRE");

    std::vector<GLenum> attachments;
	if (m_BufferHandle == 0) {
		glGenFramebuffers(1, &m_BufferHandle);
	}
    glBindFramebuffer(GL_FRAMEBUFFER, m_BufferHandle);
    GLERROR("1");

	for (auto it = m_Resources.begin(); it != m_Resources.end(); it++) {
		switch ((*it)->m_ResourceType) {
		case GL_TEXTURE_2D:
			glFramebufferTexture2D(GL_FRAMEBUFFER, (*it)->m_Attachment, (*it)->m_ResourceType, *(*it)->m_ResourceHandle, 0);
			GLERROR("FrameBuffer generate: glFramebufferTexture2D");

			break;
		case GL_RENDERBUFFER:
			glFramebufferRenderbuffer(GL_FRAMEBUFFER, (*it)->m_Attachment, (*it)->m_ResourceType, *(*it)->m_ResourceHandle);
			GLERROR("FrameBuffer generate: glFramebufferRenderbuffer");
			break;
		}
		GLERROR("2");

		if ((*it)->m_Attachment != GL_DEPTH_ATTACHMENT && (*it)->m_Attachment != GL_STENCIL_ATTACHMENT && (*it)->m_Attachment != GL_DEPTH_STENCIL_ATTACHMENT) {
			attachments.push_back((*it)->m_Attachment);
		}
		GLERROR("Attachment");

	}
	GLERROR("3");

    GLenum* bufferTextures = &attachments[0];
    glDrawBuffers(attachments.size(), bufferTextures);
    if (GLERROR("GLBufferAttachement error")) {
        printf(": AttachmentSize %i", attachments.size());
    }

    if (GLenum frameBufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
        GLERROR("Framebuffer incomplete");
        //LOG_ERROR("FrameBuffer incomplete: 0x%x\n", frameBufferStatus);
        exit(EXIT_FAILURE);
    }
    GLERROR("END");

}

void FrameBuffer::Bind()
{
    glBindFramebuffer(GL_FRAMEBUFFER, m_BufferHandle);
}

void FrameBuffer::Unbind()
{
    glBindFramebuffer(GL_FRAMEBUFFER, 0);
}

GLuint FrameBuffer::GetHandle()
{
    return m_BufferHandle;
}