// TnzCore includes
#include "tsystem.h"
#include "timage_io.h"
#include "trop.h"
#include "tconvert.h"
#include "tvectorimage.h"
#include "ttoonzimage.h"
#include "tproperty.h"
#include "trasterimage.h"
#include "tiio.h"
#include "tfilepath_io.h"

// boost includes
#include <boost/range.hpp>

// OS-specific includes
#ifdef _WIN32
#pragma warning(disable : 4996)
#include <io.h>
#endif
#ifdef LINUX
#include <unistd.h>
#endif

// System V includes
#include <fcntl.h>	// didn't even know Windows had them  :D
#include <sys/stat.h> // btw, why are they here?

DEFINE_CLASS_CODE(TImageReader, 5)
DEFINE_CLASS_CODE(TImageWriter, 6)

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

std::map<QString, TImageReaderCreateProc *> ImageReaderTable;
std::map<QString, std::pair<TImageWriterCreateProc *, bool>> ImageWriterTable;

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

bool TImageReader::m_safeMode = false;

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

TImageReader::TImageReader(const TFilePath &path)
	: TSmartObject(m_classCode), m_path(path), m_reader(0), m_vectorReader(0), m_readGreytones(true), m_file(NULL), m_is64BitEnabled(false), m_shrink(1), m_region(TRect())
{
}

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

void TImageReader::doReadGraytones(bool readThem)
{
	m_readGreytones = readThem;
}

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

TImageReader::~TImageReader()
{
	close();
}

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

bool TImageReader::isOpen() const
{
	return m_file != NULL;
}

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

void TImageReader::close()
{
	delete m_reader;
	delete m_vectorReader;

	if (m_file != NULL) {
		int err = 0;
		err = fclose(m_file);

		assert(err == 0); //il file e' stato chiuso senza errori
	}

	m_file = NULL;
	m_reader = 0;
	m_vectorReader = 0;
}

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

/*!
  Opens for reading using \b fopen().
*/
void TImageReader::getTzpPaletteColorNames(std::map<int, std::pair<std::string, std::string>> &pltColorNames)
{
	if (!m_file)
		open();

	if (!m_file)
		return;

	assert(m_reader);
	m_reader->getTzpPaletteColorNames(pltColorNames);
}

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

void TImageReader::open()
{
	assert(m_file == NULL);

	std::string type = toLower(m_path.getType());
	m_file = fopen(m_path, "rb"); //Opens for reading. If the file does not exist or cannot be found, the fopen_s call fails

	if (m_file == NULL) //Non dovrebbe mai andarci!
		close();		//close() chiude il file se e' aperto e setta m_file a NULL.
	else {
		try {
			m_reader = Tiio::makeReader(type);
			if (m_reader)
				m_reader->open(m_file);
			else {
				m_vectorReader = Tiio::makeVectorReader(type);
				if (m_vectorReader)
					m_vectorReader->open(m_file);
				else
					throw TImageException(m_path, "Image format not supported");
			}
		} catch (TException &e) {
			close(); //close() chiude il file e setta m_file a NULL.
			QString msg = QString::fromStdWString(e.getMessage());
			if (msg == QString("Old 4.1 Palette"))
				throw e;
		} catch (std::string str) {
			if (str == "Tiff file closed")
				m_file = NULL;
		}
	}
}

//===========================================================

void TImageReader::setShrink(int shrink)
{
	m_shrink = shrink;
}

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

TImageReaderP::TImageReaderP(const TFilePath &path)
{
	m_pointer = new TImageReader(path);
	m_pointer->addRef();
	m_pointer->open();
}

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

TImageP TImageReader::load()
{

	TImageP image = load0();
	if (!image)
		return TImageP();

	TImageInfo info = m_reader->getImageInfo();
	if (info.m_lx <= 0 || info.m_ly <= 0)
		return TImageP();

	return image;
}

//============================================================

template <typename Pix>
struct pixel_traits {
};

template <>
struct pixel_traits<TPixel32> {
	typedef TPixel32 rgbm_pixel_type;
	typedef char buffer_type;
};

template <>
struct pixel_traits<TPixel64> {
	typedef TPixel64 rgbm_pixel_type;
	typedef short buffer_type;
};

template <>
struct pixel_traits<TPixelGR8> {
	typedef TPixel32 rgbm_pixel_type;
	typedef char buffer_type;
};

template <>
struct pixel_traits<TPixelGR16> {
	typedef TPixel64 rgbm_pixel_type;
	typedef short buffer_type;
};

template <>
struct pixel_traits<TPixelCM32> {
	typedef TPixel32 rgbm_pixel_type;
	typedef char buffer_type;
};

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

template <typename Pix>
void copyLine(typename pixel_traits<Pix>::rgbm_pixel_type *lineIn, Pix *lineOut, int x0, int length, int shrink)
{
	lineIn += x0;

	for (int i = 0; i < length; ++i, lineIn += shrink, ++lineOut)
		memcpy(lineOut, lineIn, sizeof(Pix));
}

template <>
void copyLine<TPixelGR8>(TPixel32 *lineIn, TPixelGR8 *lineOut, int x0, int length, int shrink)
{
	lineIn += x0;

	for (int i = 0; i < length; ++i, lineIn += shrink, ++lineOut)
		lineOut->value = lineIn->r;
}

template <>
void copyLine<TPixelGR16>(TPixel64 *lineIn, TPixelGR16 *lineOut, int x0, int length, int shrink)
{
	lineIn += x0;

	for (int i = 0; i < length; ++i, lineIn += shrink, ++lineOut)
		lineOut->value = lineIn->r;
}

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

template <typename Pix>
void readRaster_copyLines(const TRasterPT<Pix> &ras, Tiio::Reader *reader,
						  int x0, int y0, int x1, int y1,
						  int inLx, int inLy, int shrink)
{
	typedef typename pixel_traits<Pix>::buffer_type buffer_type;
	typedef typename pixel_traits<Pix>::rgbm_pixel_type rgbm_pixel_type;

	int linesToSkip = shrink - 1;

	buffer_type *lineBuffer = (buffer_type *)malloc(inLx * sizeof(rgbm_pixel_type));
	if (!lineBuffer)
		return;

	rgbm_pixel_type *lineIn = (rgbm_pixel_type *)lineBuffer;

	if (reader->getRowOrder() == Tiio::BOTTOM2TOP) {
		int start = reader->skipLines(y0);
		int stop = y1 + 1;

		for (int y = start; y < stop; ++y) {
			reader->readLine(lineBuffer, x0, x1, shrink);

			if (y >= y0 && y <= y1 && (y - y0) % shrink == 0) {
				Pix *line = (Pix *)ras->getRawData(0, (y - y0) / shrink);
				copyLine<Pix>(lineIn, line, x0, ras->getLx(), shrink);
			}

			if (linesToSkip > 0 && y + linesToSkip < inLy)
				y += reader->skipLines(linesToSkip);
		}
	} else // TOP2BOTTOM
	{
		reader->skipLines(inLy - y1 - 1);

		for (int y = y1; y >= y0; --y) {
			reader->readLine(lineBuffer, x0, x1, shrink);

			if ((y - y0) % shrink == 0) {
				Pix *line = (Pix *)ras->getRawData(0, (y - y0) / shrink);
				copyLine<Pix>(lineIn, line, x0, ras->getLx(), shrink);
			}

			if (linesToSkip > 0 && y - linesToSkip > 0)
				y -= reader->skipLines(linesToSkip);
		}
	}

	free(lineBuffer);
}

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

template <typename Pix>
void readRaster(const TRasterPT<Pix> &ras, Tiio::Reader *reader,
				int x0, int y0, int x1, int y1,
				int inLx, int inLy, int shrink)
{
	typedef typename pixel_traits<Pix>::buffer_type buffer_type;

	if (shrink == 1) {
		// Direct read
		ras->lock();

		ptrdiff_t linePad = -x0 * ras->getPixelSize();

		if (reader->getRowOrder() == Tiio::BOTTOM2TOP) {
			int start = reader->skipLines(y0);
			int stop = y1 + 1;

			for (int y = start; y < stop; ++y)
				if (y >= y0 && y <= y1) {
					buffer_type *line = (buffer_type *)(ras->getRawData(0, y - y0) + linePad);
					reader->readLine(line, x0, x1, 1);
				}
		} else // TOP2BOTTOM
		{
			reader->skipLines(inLy - y1 - 1);

			for (int y = y1; y >= y0; --y) {
				buffer_type *line = (buffer_type *)(ras->getRawData(0, y - y0) + linePad);
				reader->readLine(line, x0, x1, 1);
			}
		}

		ras->unlock();
	} else
		readRaster_copyLines(ras, reader, x0, y0, x1, y1, inLx, inLy, shrink);
}

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

TImageP TImageReader::load0()
{
	if (!m_reader && !m_vectorReader)
		open();

	if (m_reader) {
		TImageInfo info = m_reader->getImageInfo();
		if (info.m_lx <= 0 || info.m_ly <= 0)
			return TImageP();

		// Initialize raster info
		assert(m_shrink > 0);

		// Build loading rect
		int x0 = 0;
		int x1 = info.m_lx - 1;
		int y0 = 0;
		int y1 = info.m_ly - 1;

		if (!m_region.isEmpty()) {
			// Intersect with the externally specified loading region

			x0 = std::max(x0, m_region.x0);
			y0 = std::max(y0, m_region.y0);
			x1 = std::min(x1, m_region.x1);
			y1 = std::min(y1, m_region.y1);

			if (x0 >= x1 || y0 >= y1)
				return TImageP();
		}

		if (m_shrink > 1) {
			// Crop to shrink multiples
			x1 -= (x1 - x0) % m_shrink;
			y1 -= (y1 - y0) % m_shrink;
		}

		assert(x0 <= x1 && y0 <= y1);

		TDimension imageDimension = TDimension((x1 - x0) / m_shrink + 1, (y1 - y0) / m_shrink + 1);

		if (m_path.getType() == "tzp" || m_path.getType() == "tzu") {
			// Colormap case

			TRasterCM32P ras(imageDimension);
			readRaster(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

			// Build the savebox
			TRect saveBox(info.m_x0, info.m_y0, info.m_x1, info.m_y1);
			if (!m_region.isEmpty()) {
				// Intersect with the loading rect
				if (m_region.overlaps(saveBox)) {
					saveBox *= m_region;

					int sbx0 = saveBox.x0 - m_region.x0;
					int sby0 = saveBox.y0 - m_region.y0;
					int sbx1 = sbx0 + saveBox.getLx() - 1;
					int sby1 = sby0 + saveBox.getLy() - 1;
					assert(sbx0 >= 0);
					assert(sby0 >= 0);
					assert(sbx1 >= 0);
					assert(sby1 >= 0);

					saveBox = TRect(sbx0, sby0, sbx1, sby1);
				} else
					saveBox = TRect(0, 0, 1, 1);
			}

			if (m_shrink > 1) {
				saveBox.x0 = saveBox.x0 / m_shrink;
				saveBox.y0 = saveBox.y0 / m_shrink;
				saveBox.x1 = saveBox.x1 / m_shrink;
				saveBox.y1 = saveBox.y1 / m_shrink;
			}

			TToonzImageP ti(ras, ras->getBounds() * saveBox);
			ti->setDpi(info.m_dpix, info.m_dpiy);

			return ti;
		} else if (info.m_bitsPerSample >= 8) {
			// Common byte-based rasters (see below, we have black-and-white bit-based images too)

			if (info.m_samplePerPixel == 1 && m_readGreytones) {
				//  Greymap case
				// NOTE: Uses a full 32-bit raster first, and then copies down to the GR8

				// Observe that GR16 file images get immediately down-cast to GR8...
				// Should we implement that too?

				TRasterGR8P ras(imageDimension);
				readRaster_copyLines(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

				TRasterImageP ri(ras);
				ri->setDpi(info.m_dpix, info.m_dpiy);

				return ri;
			}

			// assert(info.m_samplePerPixel == 3 || info.m_samplePerPixel == 4);

			TRasterP _ras;
			if (info.m_bitsPerSample == 16) {
				if (m_is64BitEnabled || m_path.getType() != "tif") {
					//  Standard 64-bit case.

					// Also covers down-casting to 32-bit from a 64-bit image file whenever
					// not a tif file (see below).

					TRaster64P ras(imageDimension);
					readRaster(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

					_ras = ras;
				} else {
					// The Tif reader has got an automatically down-casting readLine(char*, ...)
					// in case the input file is 64-bit. The advantage is that no intermediate
					// 64-bit raster is required in this case.

					TRaster32P ras(imageDimension);
					readRaster(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

					_ras = ras;
				}
			} else if (info.m_bitsPerSample == 8) {
				//  Standard 32-bit case
				TRaster32P ras(imageDimension);
				readRaster(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

				_ras = ras;
			} else
				throw TImageException(m_path, "Image format not supported");

			// 64-bit to 32-bit conversions if necessary  (64 bit images not allowed)
			if (!m_is64BitEnabled && (TRaster64P)_ras) {
				TRaster32P raux(_ras->getLx(), _ras->getLy());
				TRop::convert(raux, _ras);
				_ras = raux;
			}

			// Return the image
			TRasterImageP ri(_ras);
			ri->setDpi(info.m_dpix, info.m_dpiy);

			return ri;
		} else if (info.m_samplePerPixel == 1 && info.m_valid == true) {
			//  Previously dubbed as 'Palette cases'. No clue about what is this... :|

			TRaster32P ras(imageDimension);
			readRaster(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

			TRasterImageP ri(ras);
			ri->setDpi(info.m_dpix, info.m_dpiy);

			return ri;
		} else if (info.m_samplePerPixel == 1 && m_readGreytones) {
			//  Black-and-White case, I guess. Standard greymaps were considered above...

			TRasterGR8P ras(imageDimension);
			readRaster_copyLines(ras, m_reader, x0, y0, x1, y1, info.m_lx, info.m_ly, m_shrink);

			TRasterImageP ri(ras);
			ri->setDpi(info.m_dpix, info.m_dpiy);

			if (info.m_bitsPerSample == 1) // I suspect this always evaluates true...
				ri->setScanBWFlag(true);

			return ri;
		} else
			return TImageP();
	} else if (m_vectorReader) {
		TVectorImage *vi = m_vectorReader->read();
		return TVectorImageP(vi);
	} else
		return TImageP();
}

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

TImageWriter::TImageWriter(const TFilePath &path)
	: TSmartObject(m_classCode), m_path(path), m_writer(0), m_vectorWriter(0), m_properties(0)
{
}

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

TImageWriter::~TImageWriter()
{
	delete m_writer;
	delete m_vectorWriter;
	delete m_properties;
}

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

void TImageWriter::setProperties(const TPropertyGroup *g)
{
	if (m_properties) {
		assert(m_properties != g);
		delete m_properties;
	}
	m_properties = g ? g->clone() : 0;
}

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

void convertForWriting(TRasterP &ras, const TRasterP &rin, int bpp)
{
	switch (bpp) {
	case 1:
	case 8:
		ras = TRasterGR8P(rin->getSize());
		TRop::convert(ras, rin);
		break;
	case 24:
	case 32:
		ras = TRaster32P(rin->getSize());
		TRop::convert(ras, rin);
		break;
	case 48:
	case 64:
		ras = TRaster64P(rin->getSize());
		TRop::convert(ras, rin);
		break;
	default:
		assert(false);
	}
}

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

void TImageWriter::save(const TImageP &img)
{
	const std::string &type = toLower(m_path.getType());

	Tiio::Writer *writer = Tiio::makeWriter(type);
	if (!writer)
		throw TImageException(m_path, "unsupported format for raster images");

	writer->setProperties(m_properties);

	FILE *file = fopen(m_path, "wb");
	if (file == NULL)
		throw TImageException(m_path, "Can't write file");

	if (TRasterImageP ri = img) {
		TImageInfo info;
		TRasterP ras;

		TRasterGR8P rasGr = ri->getRaster();
		TRaster32P ras32 = ri->getRaster();
		TRaster64P ras64 = ri->getRaster();

		TEnumProperty *p = m_properties ? (TEnumProperty *)m_properties->getProperty("Bits Per Pixel")
										: 0;

		if (p && ri->isScanBW()) {
			const std::vector<std::wstring> &range = p->getRange();
			p->setValue(range[2]); // Horrible. See tiio_tif.cpp (732 or near)     -.-'
		}

		int bpp = p ? std::stoi(p->getValue()) : 32;

		//  bpp       1  8  16 24 32 40  48 56  64
		int spp[] = {1, 1, 1, 4, 4, 0, 4, 0, 4};	// 0s are for pixel sizes which are normally unsupported
		int bps[] = {1, 8, 16, 8, 8, 0, 16, 0, 16}; // by image formats, let alone by Toonz raster ones.
													// The 24 and 48 cases get automatically promoted to 32 and 64.
		int bypp = bpp / 8;
		assert(bypp < boost::size(spp) && spp[bypp] && bps[bypp]);

		info.m_samplePerPixel = spp[bypp];
		info.m_bitsPerSample = bps[bypp];

		if (rasGr) {
			if (bypp < 2)	// Seems 16 bit greymaps are not handled... why?
				ras = rasGr; // we do have a Toonz raster for those...    >:|
			else
				convertForWriting(ras, rasGr, bpp);
		} else if (ras32) {
			if (bpp == 32 || bpp == 24)
				ras = ras32;
			else
				convertForWriting(ras, ras32, bpp);
		} else if (ras64) {
			if (bpp == 64 || bpp == 48)
				ras = ras64;
			else
				convertForWriting(ras, ras64, bpp);
		} else {
			fclose(file);
			throw TImageException(m_path, "unsupported raster type");
		}

		info.m_lx = ras->getLx();
		info.m_ly = ras->getLy();

		ri->getDpi(info.m_dpix, info.m_dpiy);

		if (writer->getProperties() && m_properties)
			writer->getProperties()->setProperties(m_properties);

		writer->open(file, info);

		ras->lock();
		if (writer->getRowOrder() == Tiio::BOTTOM2TOP) {
			if (bpp == 1 || bpp == 8 || bpp == 24 || bpp == 32 || bpp == 16)
				for (int i = 0; i < ras->getLy(); i++)
					writer->writeLine((char *)ras->getRawData(0, i));
			else
				for (int i = 0; i < ras->getLy(); i++)
					writer->writeLine((short *)ras->getRawData(0, i));
		} else {
			if (bpp == 1 || bpp == 8 || bpp == 24 || bpp == 32 || bpp == 16)
				for (int i = ras->getLy() - 1; i >= 0; i--)
					writer->writeLine((char *)ras->getRawData(0, i));
			else
				for (int i = ras->getLy() - 1; i >= 0; i--)
					writer->writeLine((short *)ras->getRawData(0, i));
		}

		ras->unlock();

		writer->flush();
		delete writer;
	} else if (TVectorImageP vi = img) {
		Tiio::VectorWriter *writer = Tiio::makeVectorWriter(type);
		if (!writer) {
			fclose(file);
			throw TImageException(m_path, "unsupported format for vector images");
		}

		writer->open(file);
		writer->write(vi.getPointer());

		delete writer;
	} else {
		fclose(file);
		throw TImageException(m_path, "Can't write file");
	}

	fclose(file);
}

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

TImageWriterP::TImageWriterP(const TFilePath &path)
{
	m_pointer = new TImageWriter(path);
	m_pointer->addRef();
}

//============================================================
//
// Helper functions statiche
//
//============================================================

bool TImageReader::load(const TFilePath &path, TRasterP &raster)
{
	raster = TRasterP();
	TImageReaderP ir(path);
	if (!ir)
		return false;
	TImageP img = ir->load();
	if (!img)
		return false;

	TRasterImageP ri(img);
	if (!ri)
		return false;

	raster = ri->getRaster();
	return true;
}

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

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

void TImageReader::load(const TRasterP &ras, const TPoint &pos, int shrinkX, int shrinkY)
{
	TImageP srcImage = load();
	TRasterImageP srcRasImage = srcImage;
	TRaster32P srcRaster = srcRasImage->getRaster();
	/*
TRaster32P clippedRas = srcRaster->extractT
        (shrinkX*pos.x, shrinkY*pos.y, 
        (pos.x + ras->getLx()) * shrinkX - 1, (pos.y + ras->getLy()) * shrinkY - 1);

if (shrinkX != 1 || shrinkY != 1)
{
  TRaster32P ras32 = ras;
  if (ras32)
    ras32->fill(TPixel32::Transparent);
  TRop::resample(ras, clippedRas, TScale(1./shrinkX, 1./shrinkY), TRop::ClosestPixel);
}
else*/
	ras->copy(srcRaster);
}

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

bool TImageReader::load(const TFilePath &path, TImageP &image)
{
	image = TImageReaderP(path)->load();
	return image;
}

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

void TImageWriter::save(const TFilePath &path, TRasterP raster)
{
	TRasterImageP rasImage(raster);
	TImageWriterP(path)->save(TImageP(rasImage));
}

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

void TImageWriter::save(const TFilePath &path, const TImageP &image)
{
	TImageWriterP(path)->save(image);
}

//===========================================================
//
// funzioni per la registrazione dei formati (chiamate dal Plugin)
//
//===========================================================

void TImageReader::define(
	QString extension,
	TImageReaderCreateProc *proc)
{
	ImageReaderTable[extension] = proc;
}

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

void TImageWriter::define(
	QString extension,
	TImageWriterCreateProc *proc, bool isRenderFormat)
{
	ImageWriterTable[extension] = std::pair<TImageWriterCreateProc *, bool>(proc, isRenderFormat);
}

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

void TImageReader::getSupportedFormats(QStringList &names)
{
	for (std::map<QString, TImageReaderCreateProc *>::iterator it = ImageReaderTable.begin();
		 it != ImageReaderTable.end();
		 ++it) {
		names.push_back(it->first);
	}
}

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

void TImageWriter::getSupportedFormats(QStringList &names, bool onlyRenderFormat)
{
	for (std::map<QString, std::pair<TImageWriterCreateProc *, bool>>::iterator it = ImageWriterTable.begin();
		 it != ImageWriterTable.end();
		 ++it) {
		if (!onlyRenderFormat || it->second.second)
			names.push_back(it->first);
	}
}

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

const TImageInfo *TImageReader::getImageInfo() const
{
	if (m_reader)
		return &(m_reader->getImageInfo());
	else
		return 0;
}

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

//===========================================================
//
// Eccezioni
//
//===========================================================

TImageException::TImageException(const TFilePath &fp, const std::string &msg)
	: TException(msg), m_fp(fp)
{
}

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

TString TImageException::getMessage() const
{
	return m_fp.getWideString() + L": " + TException::getMessage();
}

//===========================================================

TImageVersionException::TImageVersionException(const TFilePath &fp, int major, int minor)
	: TException(L"The file " + fp.getWideString() +
				 L" was generated by a newer version of Toonz and cannot be loaded."),
	  m_fp(fp), m_major(major), m_minor(minor)
{
}