#include "toonz/plasticdeformerfx.h"

// TnzLib includes
#include "toonz/txsheet.h"
#include "toonz/txshleveltypes.h"
#include "toonz/txshcell.h"
#include "toonz/tcolumnfx.h"
#include "toonz/txshlevelcolumn.h"
#include "toonz/dpiscale.h"
#include "toonz/stage.h"

// TnzExt includes
#include "ext/plasticskeleton.h"
#include "ext/plasticdeformerstorage.h"
#include "ext/ttexturesstorage.h"
#include "ext/plasticvisualsettings.h"
#include "ext/meshutils.h"

// TnzBase includes
#include "trenderer.h"

// TnzCore includes
#include "tgl.h"
#include "tofflinegl.h"
#include "tgldisplaylistsmanager.h"
#include "tconvert.h"
#include "trop.h"

FX_IDENTIFIER_IS_HIDDEN(PlasticDeformerFx, "plasticDeformerFx")

//***************************************************************************************************
//    Local namespace
//***************************************************************************************************

namespace
{

std::string toString(const TAffine &aff)
{
	return
		//Observe that toString distinguishes + and - 0. That is a problem
		//when comparing aliases - so near 0 values are explicitly rounded to 0.
		(areAlmostEqual(aff.a11, 0.0) ? "0" : ::toString(aff.a11, 5)) + "," +
		(areAlmostEqual(aff.a12, 0.0) ? "0" : ::toString(aff.a12, 5)) + "," +
		(areAlmostEqual(aff.a13, 0.0) ? "0" : ::toString(aff.a13, 5)) + "," +
		(areAlmostEqual(aff.a21, 0.0) ? "0" : ::toString(aff.a21, 5)) + "," +
		(areAlmostEqual(aff.a22, 0.0) ? "0" : ::toString(aff.a22, 5)) + "," +
		(areAlmostEqual(aff.a23, 0.0) ? "0" : ::toString(aff.a23, 5));
}

//-----------------------------------------------------------------------------------

std::string toString(SkVD *vd, double sdFrame)
{
	std::string result;

	for (int p = 0; p < SkVD::PARAMS_COUNT; ++p)
		result += ::toString(vd->m_params[p]->getValue(sdFrame), 5) + " ";

	return result;
}

//-----------------------------------------------------------------------------------

std::string toString(const PlasticSkeleton::vertex_type &vx)
{
	// TODO: Add z and rigidity
	return ::toString(vx.P().x, 5) + " " + ::toString(vx.P().y, 5);
}

//-----------------------------------------------------------------------------------

std::string toString(const PlasticSkeletonDeformationP &sd, double sdFrame)
{
	std::string result;

	const PlasticSkeletonP &skeleton = sd->skeleton(sdFrame);
	if (!skeleton || skeleton->empty())
		return result;

	const tcg::list<PlasticSkeleton::vertex_type> &vertices = skeleton->vertices();

	tcg::list<PlasticSkeleton::vertex_type>::const_iterator vt, vEnd(vertices.end());

	result = toString(*vertices.begin());
	for (vt = vertices.begin(); vt != vEnd; ++vt) {
		result += "; " + toString(*vt);
		result += " " + toString(sd->vertexDeformation(vt->name()), sdFrame);
	}

	return result;
}

} // namespace

//***************************************************************************************************
//    PlasticDeformerFx  implementation
//***************************************************************************************************

PlasticDeformerFx::PlasticDeformerFx()
	: TRasterFx()
{
	addInputPort("source", m_port);
}

//-----------------------------------------------------------------------------------

TFx *PlasticDeformerFx::clone(bool recursive) const
{
	PlasticDeformerFx *fx = dynamic_cast<PlasticDeformerFx *>(TFx::clone(recursive));
	assert(fx);

	fx->m_xsh = m_xsh;
	fx->m_col = m_col;

	return fx;
}

//-----------------------------------------------------------------------------------

bool PlasticDeformerFx::canHandle(const TRenderSettings &info, double frame)
{
	// Yep. Affines are handled. Well - it's easy, since OpenGL lets you do that directly
	// with a glPushMatrix...

	return true;
}

//-----------------------------------------------------------------------------------

std::string PlasticDeformerFx::getAlias(double frame, const TRenderSettings &info) const
{
	std::string alias(getFxType());
	alias += "[";

	if (m_port.isConnected()) {
		TRasterFxP ifx = m_port.getFx();
		assert(ifx);

		alias += ifx->getAlias(frame, info);
	}

	TStageObject *meshColumnObj = m_xsh->getStageObject(TStageObjectId::ColumnId(m_col));
	const PlasticSkeletonDeformationP &sd = meshColumnObj->getPlasticSkeletonDeformation();
	if (sd)
		alias += ", " + toString(sd, meshColumnObj->paramsTime(frame));

	alias + "]";

	return alias;
}

//-----------------------------------------------------------------------------------

bool PlasticDeformerFx::doGetBBox(double frame, TRectD &bbox, const TRenderSettings &info)
{
	if (!m_port.isConnected())
		return false;

	// It's hard work to calculate the bounding box of a plastic deformation. Decline.
	bbox = TConsts::infiniteRectD;
	return true;
}

//-----------------------------------------------------------------------------------

void PlasticDeformerFx::buildRenderSettings(double frame, TRenderSettings &info)
{
	// As previously pointed out, this fx is able to handle affines. We can, actually, *decide*
	// the input reference to work with.

	// So, the best choice is to let the *input fx* decide the appropriate reference, by invoking
	// its handledAffine() method.

	info.m_bpp = 32; // We need to fix the input to 32-bpp
	info.m_affine = m_port->handledAffine(info, frame);
}

//-----------------------------------------------------------------------------------

bool PlasticDeformerFx::buildTextureDataSl(
	double frame, TRenderSettings &info, TAffine &worldLevelToLevelAff)
{
	int row = (int)frame;

	// Initialize level vars
	TLevelColumnFx *lcfx = (TLevelColumnFx *)m_port.getFx();
	TXshLevelColumn *texColumn = lcfx->getColumn();

	const TXshCell &texCell = texColumn->getCell(row);

	TXshSimpleLevel *texSl = texCell.getSimpleLevel();
	const TFrameId &texFid = texCell.getFrameId();

	if (!texSl || texSl->getType() == MESH_XSHLEVEL)
		return false;

	// Build dpi data
	TPointD texDpi(texSl->getDpi(texFid, 0));
	if (texDpi.x == 0.0 || texDpi.y == 0.0 || texSl->getType() == PLI_XSHLEVEL)
		texDpi.x = texDpi.y = Stage::inch;

	// Build reference transforms data

	// NOTE: TAffine() corresponds to IMAGE coordinates here, not WORLD coordinates. This is achieved
	// by removing the level's dpi affine during render-tree build-up (see scenefx.cpp).

	worldLevelToLevelAff = TScale(texDpi.x / Stage::inch, texDpi.y / Stage::inch);

	// Initialize input render settings

	// In the case of vector images, in order to retain the image quality required by info.m_affine,
	// the scale component is allowed too.

	// In the raster image case, we'll use the original image reference IF the affine is a magnification
	// (ie the scale is > 1.0) - OTHERWISE, the OpenGL minification filter is too crude since it renders
	// a fragment using its 4 adjacent pixels ONLY; in this case, we'll pass the affine below.

	const TAffine &handledAff = TRasterFx::handledAffine(info, frame);

	if (texSl->getType() == PLI_XSHLEVEL) {
		info.m_affine = handledAff;
		buildRenderSettings(frame, info);
	} else {
		info.m_affine = TAffine();
		buildRenderSettings(frame, info);

		// NOTE: scale = handledAff.a11 / worldLevelToLevelAff.a11
		if (handledAff.a11 < worldLevelToLevelAff.a11)
			info.m_affine = TScale(handledAff.a11 / worldLevelToLevelAff.a11) * info.m_affine;
	}

	return true;
}

//-----------------------------------------------------------------------------------

bool PlasticDeformerFx::buildTextureData(
	double frame, TRenderSettings &info, TAffine &worldLevelToLevelAff)
{
	// Common case (typically happen with sub-xsheets)

	buildRenderSettings(frame, info); // Adjust the info
	worldLevelToLevelAff = TAffine(); // Reference match

	return true;
}

//-----------------------------------------------------------------------------------

void PlasticDeformerFx::doCompute(TTile &tile, double frame, const TRenderSettings &info)
{
	if (!m_port.isConnected()) {
		tile.getRaster()->clear();
		return;
	}

	int row = (int)frame;

	// Build texture data
	TRenderSettings texInfo(info);
	TAffine worldTexLevelToTexLevelAff;

	if (dynamic_cast<TLevelColumnFx *>(m_port.getFx())) {
		if (!buildTextureDataSl(frame, texInfo, worldTexLevelToTexLevelAff))
			return;
	} else
		buildTextureData(frame, texInfo, worldTexLevelToTexLevelAff);

	// Initialize mesh level vars

	const TXshCell &meshCell = m_xsh->getCell(row, m_col);

	TXshSimpleLevel *meshSl = meshCell.getSimpleLevel();
	const TFrameId &meshFid = meshCell.getFrameId();

	if (!meshSl || meshSl->getType() != MESH_XSHLEVEL)
		return;

	// Retrieve mesh image and deformation

	TStageObject *meshColumnObj = m_xsh->getStageObject(TStageObjectId::ColumnId(m_col));

	TMeshImageP mi(meshSl->getFrame(meshFid, false));
	if (!mi)
		return;

	// Retrieve deformation data

	const PlasticSkeletonDeformationP &sd = meshColumnObj->getPlasticSkeletonDeformation();
	assert(sd);

	double sdFrame = meshColumnObj->paramsTime(frame);

	// Build dpi data

	TPointD meshDpi(meshSl->getDpi(meshFid, 0));
	assert(meshDpi.x != 0.0 && meshDpi.y != 0.0);

	// Build reference transforms data

	// Build affines

	const TAffine &imageToTextureAff = texInfo.m_affine;
	const TAffine &worldTexLevelToWorldMeshAff = m_texPlacement;
	const TAffine &meshToWorldMeshAff = TScale(Stage::inch / meshDpi.x, Stage::inch / meshDpi.y);

	const TAffine &meshToTexLevelAff = worldTexLevelToTexLevelAff * worldTexLevelToWorldMeshAff.inv() * meshToWorldMeshAff;
	const TAffine &meshToTextureAff = imageToTextureAff * meshToTexLevelAff;

	// Retrieve deformer data

	TScale worldMeshToMeshAff(meshDpi.x / Stage::inch, meshDpi.y / Stage::inch);

	std::auto_ptr<const PlasticDeformerDataGroup> dataGroup(
		PlasticDeformerStorage::instance()->processOnce(
			sdFrame, mi.getPointer(), sd.getPointer(), sd->skeletonId(sdFrame), worldMeshToMeshAff));

	// Build texture

	// Build the mesh's bounding box and map it to input reference
	TRectD meshBBox(meshToTextureAff * mi->getBBox());

	// Now, build the tile's geometry
	TRectD texBBox;
	m_port->getBBox(frame, texBBox, texInfo);

	TRectD bbox = texBBox * meshBBox;
	if (bbox.getLx() <= 0.0 || bbox.getLy() <= 0.0)
		return;

	bbox.x0 = tfloor(bbox.x0);
	bbox.y0 = tfloor(bbox.y0);
	bbox.x1 = tceil(bbox.x1);
	bbox.y1 = tceil(bbox.y1);

	TDimension tileSize(tround(bbox.getLx()), tround(bbox.getLy()));

	// Then, compute the input image
	TTile inTile;
	m_port->allocateAndCompute(inTile, bbox.getP00(), tileSize, TRasterP(), frame, texInfo);

	// Draw the textured mesh
	{
		// Prepare texture
		TRaster32P tex(inTile.getRaster());
		TRop::depremultiply(tex); // Textures must be stored depremultiplied.
								  // See docs about the tglDraw() below.
		static TAtomicVar var;
		const std::string &texId = "render_tex " + ::toString((int)++var);

		// Prepare an OpenGL context
		std::auto_ptr<TOfflineGL> context(new TOfflineGL(tile.getRaster()->getSize()));
		context->makeCurrent();

		// Load texture into the context
		TTexturesStorage *ts = TTexturesStorage::instance();
		const DrawableTextureDataP &texData = ts->loadTexture(texId, tex, bbox);

		// Draw
		glPushMatrix();
		tglMultMatrix(TTranslation(-tile.m_pos) * info.m_affine *
					  meshToWorldMeshAff);

		glEnable(GL_BLEND);
		glEnable(GL_TEXTURE_2D);

		tglDraw(*mi, *texData, meshToTextureAff, *dataGroup);

		// Retrieve drawing and copy to output tile
		context->getRaster(tile.getRaster());

		// Cleanup

		// No need to disable stuff - the context dies here

		// ts->unloadTexture(texId);                                // Auto-released due to display list destruction
		context->doneCurrent();
	}
}

//-----------------------------------------------------------------------------------

void PlasticDeformerFx::doDryCompute(TRectD &rect, double frame, const TRenderSettings &info)
{
	if (!m_port.isConnected())
		return;

	int row = (int)frame;

	TRenderSettings texInfo(info);
	TAffine worldTexLevelToTexLevelAff;

	if (dynamic_cast<TLevelColumnFx *>(m_port.getFx())) {
		if (!buildTextureDataSl(frame, texInfo, worldTexLevelToTexLevelAff))
			return;
	} else
		buildTextureData(frame, texInfo, worldTexLevelToTexLevelAff);

	const TXshCell &meshCell = m_xsh->getCell(row, m_col);

	TXshSimpleLevel *meshSl = meshCell.getSimpleLevel();
	const TFrameId &meshFid = meshCell.getFrameId();

	if (!meshSl || meshSl->getType() == MESH_XSHLEVEL)
		return;

	TStageObject *meshColumnObj = m_xsh->getStageObject(TStageObjectId::ColumnId(m_col));

	TMeshImageP mi(meshSl->getFrame(meshFid, false));
	if (!mi)
		return;

	const PlasticSkeletonDeformationP &sd = meshColumnObj->getPlasticSkeletonDeformation();
	assert(sd);

	TPointD meshDpi(meshSl->getDpi(meshFid, 0));
	assert(meshDpi.x != 0.0 && meshDpi.y != 0.0);

	const TAffine &textureToImageAff = texInfo.m_affine;
	const TAffine &worldImageToWorldMeshAff = m_texPlacement;
	const TAffine &meshToWorldMeshAff = TScale(Stage::inch / meshDpi.x, Stage::inch / meshDpi.y);

	const TAffine &meshToTextureAff =
		textureToImageAff.inv() * worldTexLevelToTexLevelAff * worldImageToWorldMeshAff.inv() * meshToWorldMeshAff;

	// Build the mesh's bounding box and map it to input reference
	TRectD meshBBox(meshToTextureAff * mi->getBBox());

	// Now, build the tile's geometry
	TRectD texBBox;
	m_port->getBBox(frame, texBBox, texInfo);

	TRectD bbox = texBBox * meshBBox;
	if (bbox.getLx() <= 0.0 || bbox.getLy() <= 0.0)
		return;

	bbox.x0 = tfloor(bbox.x0);
	bbox.y0 = tfloor(bbox.y0);
	bbox.x1 = tceil(bbox.x1);
	bbox.y1 = tceil(bbox.y1);

	m_port->dryCompute(bbox, frame, texInfo);
}