//Toonz includes
#include "tvectorimage.h"
#include "trasterimage.h"
#include "tlevel_io.h"
#include "tofflinegl.h"
#include "tropcm.h"
#include "tvectorrenderdata.h"
#include "tsystem.h"

//Qt includes
#include <QDir>
#include <QImage>

#include "toonz/stylemanager.h"

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

namespace
{

TFilePath rootPath;

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

void convertRaster32ToImage(TRaster32P ras, QImage *image)
{
	int lx = ras->getLx();
	int ly = ras->getLy();
	int i, j;
	ras->lock();
	for (i = 0; i < lx; i++)
		for (j = 0; j < ly; j++) {
			TPixel32 pix = ras->pixels(ly - 1 - j)[i];
			QRgb value;
			value = qRgba(pix.r, pix.g, pix.b, pix.m);
			image->setPixel(i, j, value);
		}
	ras->unlock();
}

} //namespace

//********************************************************************************
//    StyleLoaderTask definition
//********************************************************************************

class CustomStyleManager::StyleLoaderTask : public TThread::Runnable
{
	CustomStyleManager *m_manager;
	TFilePath m_fp;
	PatternData m_data;

public:
	StyleLoaderTask(CustomStyleManager *manager, const TFilePath &fp);

	void run();

	void onFinished(TThread::RunnableP sender);
};

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

CustomStyleManager::StyleLoaderTask::StyleLoaderTask(CustomStyleManager *manager, const TFilePath &fp)
	: m_manager(manager), m_fp(fp)
{
	connect(this, SIGNAL(finished(TThread::RunnableP)), this, SLOT(onFinished(TThread::RunnableP)));
}

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

void CustomStyleManager::StyleLoaderTask::run()
{
	try {
		//Fetch the level
		TLevelReaderP lr(m_fp);
		TLevelP level = lr->loadInfo();
		if (!level || level->getFrameCount() == 0)
			return;

		//Fetch the image of the first frame in the level
		TLevel::Iterator frameIt = level->begin();
		if (frameIt == level->end())
			return;
		TImageP img = lr->getFrameReader(frameIt->first)->load();

		//Process the image
		const QSize &qChipSize = m_manager->getChipSize();
		TDimension chipSize(qChipSize.width(), qChipSize.height());

		TVectorImageP vimg = img;
		TRasterImageP rimg = img;

		TRaster32P ras;
		if (vimg) {
			assert(level->getPalette());
			TPalette *vPalette = level->getPalette();
			assert(vPalette);
			vimg->setPalette(vPalette);

			TOfflineGL *glContext = 0;
			glContext = TOfflineGL::getStock(chipSize);

			glContext->clear(TPixel32::White);
			TRectD bbox = img->getBBox();
			double scx = 0.8 * chipSize.lx / bbox.getLx();
			double scy = 0.8 * chipSize.ly / bbox.getLy();
			double sc = tmin(scx, scy);
			double dx = 0.5 * chipSize.lx;
			double dy = 0.5 * chipSize.ly;

			TAffine aff = TTranslation(dx, dy) * TScale(sc) *
						  TTranslation(-0.5 * (bbox.x0 + bbox.x1), -0.5 * (bbox.y0 + bbox.y1));
			TVectorRenderData rd(aff, chipSize, vPalette, 0, true);

			glContext->draw(img, rd);

			//No need to clone! The received raster already is a copy of the context's buffer
			ras = glContext->getRaster(); //->clone();
		} else if (rimg) {
			TDimension size = rimg->getRaster()->getSize();
			if (size == chipSize)
				ras = rimg->getRaster()->clone(); //Yep, this may be necessary
			else {
				TRaster32P rout(chipSize);

				TRop::resample(rout, rimg->getRaster(),
							   TScale((double)chipSize.lx / size.lx, (double)chipSize.ly / size.ly));

				TRop::addBackground(rout, TPixel::White);
				ras = rout;
			}
		} else
			assert(!"unsupported type for custom styles!");

		QImage *image = new QImage(chipSize.lx, chipSize.ly, QImage::Format_RGB32);
		convertRaster32ToImage(ras, image);

		m_data.m_patternName = m_fp.getName();
		m_data.m_isVector = (m_fp.getType() == "pli" || m_fp.getType() == "svg");
		m_data.m_image = image;
	} catch (...) {
	}
}

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

void CustomStyleManager::StyleLoaderTask::onFinished(TThread::RunnableP sender)
{
	//On the main thread...
	if (m_data.m_image) //Everything went ok
	{
		m_manager->m_patterns.push_back(m_data);
		emit m_manager->patternAdded();
	}
}

//********************************************************************************
//    CustomStyleManager implementation
//********************************************************************************

CustomStyleManager::CustomStyleManager(
	const TFilePath &stylesFolder, QString filters, QSize chipSize)
	: m_stylesFolder(stylesFolder), m_filters(filters), m_chipSize(chipSize)
{
	m_executor.setMaxActiveTasks(1);
}

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

int CustomStyleManager::getPatternCount()
{
	return m_patterns.size();
}

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

CustomStyleManager::PatternData CustomStyleManager::getPattern(int index)
{
	return (index < 0 || index >= m_patterns.size()) ? PatternData() : m_patterns[index];
}

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

TFilePath CustomStyleManager::getRootPath()
{
	return ::rootPath;
}

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

void CustomStyleManager::setRootPath(const TFilePath &rootPath)
{
	::rootPath = rootPath;
}

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

void CustomStyleManager::loadItems()
{
	//Build the folder to be read
	const TFilePath &rootFP(getRootPath());

	assert(rootFP != TFilePath());
	if (rootFP == TFilePath())
		return;

	QDir patternDir(QString::fromStdWString((rootFP + m_stylesFolder).getWideString()));
	patternDir.setNameFilters(m_filters.split(' '));

	//Read the said folder
	TFilePathSet fps;
	try {
		TSystem::readDirectory(fps, patternDir);
	} catch (...) {
		return;
	}

	//Delete patterns no longer in the folder
	TFilePathSet newFps;
	TFilePathSet::iterator it;
	int i;
	for (i = 0; i < m_patterns.size(); i++) {
		PatternData data = m_patterns.at(i);
		for (it = fps.begin(); it != fps.end(); ++it) {
			if (data.m_patternName == it->getName() && data.m_isVector == (it->getType() == "pli"))
				break;
		}

		if (it == fps.end()) {
			m_patterns.removeAt(i);
			i--;
		} else
			fps.erase(it); //The style is not new, so don't generate tasks for it
	}

	//For each (now new) file entry, generate a fetching task
	for (TFilePathSet::iterator it = fps.begin(); it != fps.end(); it++)
		m_executor.addTask(new StyleLoaderTask(this, *it));
}