#ifdef WIN32
#pragma warning(disable : 4996)
#endif
//#include "texception.h"
//#include "tfilepath.h"
//#include "tiio_jpg.h"
//#include "../compatibility/tnz4.h"

#include "tiio_jpg.h"
#include "tproperty.h"
#include "tpixel.h"

/*
 * Include file for users of JPEG library.
 * You will need to have included system headers that define at least
 * the typedefs FILE and size_t before you can include jpeglib.h.
 * (stdio.h is sufficient on ANSI-conforming systems.)
 * You may also wish to include "jerror.h".
 */

#include <assert.h>
#include <stdio.h>

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

const string Tiio::JpgWriterProperties::QUALITY("Quality");

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

extern "C" void tnz_error_exit(j_common_ptr cinfo)
{
	//  throw "merda";
}

#ifdef CICCIO
JMETHOD(void, error_exit, (j_common_ptr cinfo));
/* Conditionally emit a trace or warning message */
JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
/* Routine that actually outputs a trace or error message */
JMETHOD(void, output_message, (j_common_ptr cinfo));
/* Format a message string for the most recent JPEG error or message */
JMETHOD(void, format_message, (j_common_ptr cinfo, char *buffer));
#define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
/* Reset error state variables at start of a new image */
JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
#endif

using namespace Tiio;

JpgReader::JpgReader() : m_chan(0), m_isOpen(false)
{
	memset(&m_cinfo, 0, sizeof m_cinfo);
	memset(&m_jerr, 0, sizeof m_jerr);
	memset(&m_buffer, 0, sizeof m_buffer);
}

JpgReader::~JpgReader()
{
	if (m_isOpen) {
		try {
			jpeg_finish_decompress(&m_cinfo);
			jpeg_destroy_decompress(&m_cinfo);
		} catch (...) {
		}
	}
	if (m_chan) {
		m_chan = 0;
	}
}

Tiio::RowOrder JpgReader::getRowOrder() const { return Tiio::TOP2BOTTOM; }

void JpgReader::open(FILE *file)
{
	m_cinfo.err = jpeg_std_error(&m_jerr);
	m_cinfo.err->error_exit = tnz_error_exit;

	jpeg_create_decompress(&m_cinfo);
	m_chan = file;
	jpeg_stdio_src(&m_cinfo, m_chan);
	bool ret = jpeg_read_header(&m_cinfo, TRUE);
	ret = ret && jpeg_start_decompress(&m_cinfo);
	if (!ret)
		return;

	int row_stride = m_cinfo.output_width * m_cinfo.output_components;
	m_buffer = (*m_cinfo.mem->alloc_sarray)((j_common_ptr)&m_cinfo, JPOOL_IMAGE, row_stride, 1);

	m_info.m_lx = m_cinfo.output_width;
	m_info.m_ly = m_cinfo.output_height;
	m_info.m_samplePerPixel = 3;
	m_info.m_valid = true;
	m_isOpen = true;
}

void JpgReader::readLine(char *buffer, int x0, int x1, int shrink)
{
	if (m_cinfo.out_color_space == JCS_RGB && m_cinfo.out_color_components == 3) {
		int ret = jpeg_read_scanlines(&m_cinfo, m_buffer, 1);
		assert(ret == 1);
		unsigned char *src = m_buffer[0];
		TPixel32 *dst = (TPixel32 *)buffer;
		dst += x0;
		src += 3 * x0;

		int width = (m_cinfo.output_width - 1) / shrink + 1;
		if (x1 >= x0)
			width = (x1 - x0) / shrink + 1;

		while (--width >= 0) {
			dst->r = src[0];
			dst->g = src[1];
			dst->b = src[2];
			dst->m = (char)255;
			src += 3 * shrink;
			dst += shrink;
		}
	} else if (m_cinfo.out_color_components == 1) {
		int ret = jpeg_read_scanlines(&m_cinfo, m_buffer, 1);
		assert(ret == 1);
		unsigned char *src = m_buffer[0];
		TPixel32 *dst = (TPixel32 *)buffer;

		dst += x0;
		src += x0;

		int width = (m_cinfo.output_width - 1) / shrink + 1;
		if (x1 >= x0)
			width = (x1 - x0) / shrink + 1;

		while (--width >= 0) {
			dst->r = *src;
			dst->g = *src;
			dst->b = *src;
			dst->m = (char)255;
			src += shrink;
			dst += shrink;
		}
	}
}

int JpgReader::skipLines(int lineCount)
{
	for (int i = 0; i < lineCount; i++) {
		int ret = jpeg_read_scanlines(&m_cinfo, m_buffer, 1);
		assert(ret == 1);
	}
	return lineCount;
}

class JpgWriter : public Tiio::Writer
{

	struct jpeg_compress_struct m_cinfo;
	struct jpeg_error_mgr m_jerr;
	FILE *m_chan;
	JSAMPARRAY m_buffer;
	bool m_headerWritten;

public:
	JpgWriter()
		: m_chan(0), m_headerWritten(false)
	{
	}

	void open(FILE *file, const TImageInfo &info)
	{
		m_cinfo.err = jpeg_std_error(&m_jerr);
		jpeg_create_compress(&m_cinfo);

		m_cinfo.image_width = info.m_lx;
		m_cinfo.image_height = info.m_ly;
		m_cinfo.input_components = 3;
		m_cinfo.in_color_space = JCS_RGB;

		jpeg_set_defaults(&m_cinfo);
		if (!m_properties)
			m_properties = new Tiio::JpgWriterProperties();

		jpeg_set_quality(&m_cinfo, ((TIntProperty *)(m_properties->getProperty("Quality")))->getValue(), TRUE);
		m_cinfo.smoothing_factor = ((TIntProperty *)(m_properties->getProperty("Smoothing")))->getValue();

		int row_stride = m_cinfo.image_width * m_cinfo.input_components;
		m_buffer = (*m_cinfo.mem->alloc_sarray)((j_common_ptr)&m_cinfo, JPOOL_IMAGE, row_stride, 1);

		m_chan = file;
		jpeg_stdio_dest(&m_cinfo, m_chan);
	}

	~JpgWriter()
	{
		jpeg_finish_compress(&m_cinfo);
		jpeg_destroy_compress(&m_cinfo);
		delete m_properties;
	}

	void flush()
	{
		fflush(m_chan);
	}

	Tiio::RowOrder getRowOrder() const { return Tiio::TOP2BOTTOM; }

	void writeLine(char *buffer)
	{
		if (!m_headerWritten) {
			m_headerWritten = true;
			jpeg_start_compress(&m_cinfo, TRUE);
		}
		TPixel32 *src = (TPixel32 *)buffer;
		unsigned char *dst = m_buffer[0];
		int lx = m_cinfo.image_width;
		while (--lx >= 0) {
			dst[0] = src->r;
			dst[1] = src->g;
			dst[2] = src->b;
			dst += 3;
			++src;
		}
		jpeg_write_scanlines(&m_cinfo, m_buffer, 1);
	}
};

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

Tiio::Reader *Tiio::makeJpgReader()
{
	return new JpgReader();
}

Tiio::Writer *Tiio::makeJpgWriter()
{
	return new JpgWriter();
}