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#include "fsCTexture.h"

#include <fsCore/fsSColour.h>
#include <fsCore/src/fsCResourceName.h>
#include <fsCore/src/fsNCoreUtils.h>
#include <fsCore/fsPoint.h>

#include "../../src/fsCBrush.h"
#include "fsCImage.h"

fsU32 fsCTexture::filterModes(fsFilterMode pNewMode) const<--- The member function 'fsCTexture::filterModes' can be static.
{
	switch(pNewMode)
	{
		case fsFilterMode::eNEAREST:				return BGFX_SAMPLER_MIN_POINT | BGFX_SAMPLER_MAG_POINT;
		case fsFilterMode::eNEAREST_MIPMAP_NEAREST:	return BGFX_SAMPLER_MIN_POINT | BGFX_SAMPLER_MAG_POINT | BGFX_SAMPLER_MIP_POINT;
		case fsFilterMode::eNEAREST_MIPMAP_LINEAR:	return BGFX_SAMPLER_MIN_POINT | BGFX_SAMPLER_MAG_POINT;
		case fsFilterMode::eLINEAR:					return 0;	// bgfx default is bilinear
		case fsFilterMode::eLINEAR_MIPMAP_LINEAR:	return 0;
		case fsFilterMode::eLINEAR_MIPMAP_NEAREST:	return BGFX_SAMPLER_MIP_POINT;
		case fsFilterMode::eDONT_CARE:				return 0;
	}
	return 0;
}

fsU32 fsCTexture::wrapModes(fsWrapMode pNewMode) const<--- The member function 'fsCTexture::wrapModes' can be static.
{
	switch(pNewMode)
	{
		case fsWrapMode::eREPEAT:			return 0;	// bgfx default is repeat
		case fsWrapMode::eMIRROR_REPEAT:	return BGFX_SAMPLER_U_MIRROR | BGFX_SAMPLER_V_MIRROR;
		case fsWrapMode::eCLAMP_TO_EDGE:	return BGFX_SAMPLER_U_CLAMP | BGFX_SAMPLER_V_CLAMP;
		case fsWrapMode::eDONT_CARE:		return 0;
	}
	return 0;
}

void fsCTexture::filterModeSetDo(fsFilterMode pNewMode)
{
	mFilterFlags = filterModes(pNewMode);
	mSamplerFlags = mFilterFlags | mWrapFlags;
}

void fsCTexture::wrapModeSetDo(fsWrapMode pNewMode)
{
	mWrapFlags = wrapModes(pNewMode);
	mSamplerFlags = mFilterFlags | mWrapFlags;
}

fsBool fsCTexture::hasAlphaChannelGet() const
{
	return false;
}

fsU8 fsCTexture::alphaGet(fsS32 pU, fsS32 pV, fsS32 pCol, fsS32 pRow) const
{
	return mImage->alphaGet({pU + pCol, pV + pRow});
}

fsSColour4B fsCTexture::pixelGetDo(fsS32 pU, fsS32 pV, fsS32 pCol, fsS32 pRow)
{
	return mImage->pixelGet({pU + pCol, pV + pRow});
}

void fsCTexture::doPixelSet(fsS32 pU, fsS32 pV, fsS32 pCol, fsS32 pRow, const fsSColour4B& pPixel)
{
	mImage->pixelSet(pU, pV, pCol, pRow, pPixel);
}

void fsCTexture::doTextureCopyThroughStencil(std::shared_ptr<fsITexture> pSrc, std::shared_ptr<fsITexture> pStencil,
                                             fsS32 pU, fsS32 pV, fsS32 pX, fsS32 pY, fsS32 pAlphaHitMaskThreshold)
{
	mImage->textureCopyThroughStencil(
		static_cast<fsCTexture*>(pSrc.get())->mImage.get(),
		static_cast<fsCTexture*>(pStencil.get())->mImage.get(), pU, pV, pX, pY);

	hitMapStore(pAlphaHitMaskThreshold);
	finalise();
}

void fsCTexture::doTextureCopyInto(std::shared_ptr<fsITexture> pSrc, fsS32 pU, fsS32 pV, fsS32 pX, fsS32 pY)
{
	mImage->textureCopyInto(
		static_cast<fsCTexture*>(pSrc.get())->mImage.get(), pU, pV, pX, pY);
}

fsS32 fsCTexture::imageWidthGet() const
{
	return mWidth;
}

fsS32 fsCTexture::imageHeightGet() const
{
	return mHeight;
}

fsS32 fsCTexture::textureWidthGet() const
{
	return mTexWidth;
}

fsS32 fsCTexture::textureHeightGet() const
{
	return mTexHeight;
}

void fsCTexture::textureRelease()
{
	if (bgfx::isValid(mTexture))
	{
		bgfx::destroy(mTexture);
		mTexture = BGFX_INVALID_HANDLE;
	}
}

void fsCTexture::createFromImage(fsIImage const* pImage)
{
	textureRelease();

	auto* const impl = static_cast<fsCImage const*>(pImage);
	mTexWidth = impl->mWidth;
	mTexHeight = impl->mHeight;

	mTexture = bgfx::createTexture2D(
		static_cast<uint16_t>(impl->mWidth),
		static_cast<uint16_t>(impl->mHeight),
		false, 1, bgfx::TextureFormat::RGBA8, 0,
		bgfx::copy(impl->mPixels.data(), static_cast<uint32_t>(impl->mPixels.size())));

	wrapModeSetDo(fsWrapMode::eCLAMP_TO_EDGE);
	filterModeSetDo(fsFilterMode::eLINEAR);
}

fsU8 fsCTexture::alphaValueGet(fsS32 pImgX, fsS32 pImgY)
{
	return mImage->alphaGet({pImgX, pImgY});
}

void fsCTexture::doBlend(fsCBrush const* const pBlend, fsPoint const& pOffset)
{
}

std::shared_ptr<fsITexture> fsCTexture::doCloneSubSection(fsCBrush const* const pBlend, fsPoint const& pOffset) const
{
	std::shared_ptr<fsITexture> ret = std::shared_ptr<fsITexture>(new fsCTexture());
	return ret;
}

void fsCTexture::createFromAlpha8Data(std::vector<fsU8>& pAlphaData, fsS32 pImgW, fsS32 pImgH,
                                      fsPoint const& pPOTDimenions)
{
	textureRelease();

	fsS32 const bytesPerPixel = {4};
	fsS32 const stride = {pPOTDimenions.x * bytesPerPixel};
	fsS32 const alphaStride = {pPOTDimenions.x};
	std::vector<fsU8> imgData(stride * pPOTDimenions.y, 0);

	for (fsS32 row = 0; row < pImgH; ++row)
	{
		for (fsS32 col = 0; col < pImgW; ++col)
		{
			fsS32 const newIndex = col * 4 + (row * stride);
			fsU8 const alphaValue = pAlphaData[col + (row * alphaStride)];
			imgData[newIndex + 0] = imgData[newIndex + 1] = imgData[newIndex + 2] = imgData[newIndex + 3] = alphaValue;
		}
	}

	mTexWidth = pPOTDimenions.x;
	mTexHeight = pPOTDimenions.y;

	mTexture = bgfx::createTexture2D(
		static_cast<uint16_t>(pPOTDimenions.x),
		static_cast<uint16_t>(pPOTDimenions.y),
		false, 1, bgfx::TextureFormat::RGBA8, 0,
		bgfx::copy(imgData.data(), static_cast<uint32_t>(imgData.size())));

	wrapModeSetDo(fsWrapMode::eCLAMP_TO_EDGE);
	filterModeSetDo(fsFilterMode::eLINEAR);

	mWidth = pImgW;
	mHeight = pImgH;
}

fsCTexture::fsCTexture()
{
}

fsCTexture::~fsCTexture()
{
	textureRelease();
}