#include "stdafx.h"
#include "Emu/Memory/Memory.h"
#include "Emu/System.h"
#include "Emu/IdManager.h"
#include "Emu/SysCalls/Modules.h"

extern "C"
{
#include "stblib/stb_image.h"
}

#include "Emu/FS/VFS.h"
#include "Emu/FS/vfsFileBase.h"
#include "Emu/SysCalls/lv2/sys_fs.h"

#include "cellJpgDec.h"

extern Module cellJpgDec;

s32 cellJpgDecCreate(u32 mainHandle, u32 threadInParam, u32 threadOutParam)
{
	UNIMPLEMENTED_FUNC(cellJpgDec);
	return CELL_OK;
}

s32 cellJpgDecExtCreate(u32 mainHandle, u32 threadInParam, u32 threadOutParam, u32 extThreadInParam, u32 extThreadOutParam)
{
	UNIMPLEMENTED_FUNC(cellJpgDec);
	return CELL_OK;
}

s32 cellJpgDecDestroy(u32 mainHandle)
{
	UNIMPLEMENTED_FUNC(cellJpgDec);
	return CELL_OK;
}

s32 cellJpgDecOpen(u32 mainHandle, vm::ptr<u32> subHandle, vm::ptr<CellJpgDecSrc> src, vm::ptr<CellJpgDecOpnInfo> openInfo)
{
	cellJpgDec.Warning("cellJpgDecOpen(mainHandle=0x%x, subHandle=*0x%x, src=*0x%x, openInfo=*0x%x)", mainHandle, subHandle, src, openInfo);

	auto current_subHandle = std::make_shared<CellJpgDecSubHandle>();

	current_subHandle->fd = 0;
	current_subHandle->src = *src;

	switch(src->srcSelect.data())
	{
	case se32(CELL_JPGDEC_BUFFER):
		current_subHandle->fileSize = src->streamSize;
		break;

	case se32(CELL_JPGDEC_FILE):
	{
		// Get file descriptor and size
		std::shared_ptr<vfsStream> file_s(Emu.GetVFS().OpenFile(src->fileName.get_ptr(), vfsRead));
		if (!file_s) return CELL_JPGDEC_ERROR_OPEN_FILE;

		current_subHandle->fd = Emu.GetIdManager().make<lv2_file_t>(file_s, 0, 0);
		current_subHandle->fileSize = file_s->GetSize();
		break;
	}
	}

	// From now, every u32 subHandle argument is a pointer to a CellJpgDecSubHandle struct.
	*subHandle = Emu.GetIdManager().add(std::move(current_subHandle));

	return CELL_OK;
}

s32 cellJpgDecClose(u32 mainHandle, u32 subHandle)
{
	cellJpgDec.Warning("cellJpgDecOpen(mainHandle=0x%x, subHandle=0x%x)", mainHandle, subHandle);

	const auto subHandle_data = Emu.GetIdManager().get<CellJpgDecSubHandle>(subHandle);

	if (!subHandle_data)
	{
		return CELL_JPGDEC_ERROR_FATAL;
	}

	Emu.GetIdManager().remove<lv2_file_t>(subHandle_data->fd);
	Emu.GetIdManager().remove<CellJpgDecSubHandle>(subHandle);

	return CELL_OK;
}

s32 cellJpgDecReadHeader(u32 mainHandle, u32 subHandle, vm::ptr<CellJpgDecInfo> info)
{
	cellJpgDec.Log("cellJpgDecReadHeader(mainHandle=0x%x, subHandle=0x%x, info=*0x%x)", mainHandle, subHandle, info);

	const auto subHandle_data = Emu.GetIdManager().get<CellJpgDecSubHandle>(subHandle);

	if (!subHandle_data)
	{
		return CELL_JPGDEC_ERROR_FATAL;
	}

	const u32& fd = subHandle_data->fd;
	const u64& fileSize = subHandle_data->fileSize;
	CellJpgDecInfo& current_info = subHandle_data->info;

	//Write the header to buffer
	vm::var<u8[]> buffer((u32)fileSize);

	switch(subHandle_data->src.srcSelect.data())
	{
	case se32(CELL_JPGDEC_BUFFER):
		memmove(buffer.begin(), vm::get_ptr<void>(subHandle_data->src.streamPtr), buffer.size());
		break;

	case se32(CELL_JPGDEC_FILE):
	{
		auto file = Emu.GetIdManager().get<lv2_file_t>(fd);
		file->file->Seek(0);
		file->file->Read(buffer.ptr(), buffer.size());
		break;
	}
	}

	if (*buffer.To<u32>(0) != 0xE0FFD8FF || // Error: Not a valid SOI header
		*buffer.To<u32>(6) != 0x4649464A)   // Error: Not a valid JFIF string
	{
		return CELL_JPGDEC_ERROR_HEADER; 
	}

	u32 i = 4;
	
	if(i >= fileSize)
		return CELL_JPGDEC_ERROR_HEADER;

	u16 block_length = buffer[i] * 0xFF + buffer[i+1];

	while(true)
	{
		i += block_length;                                  // Increase the file index to get to the next block
		if (i >= fileSize ||                                // Check to protect against segmentation faults
			buffer[i] != 0xFF)                              // Check that we are truly at the start of another block
		{
			return CELL_JPGDEC_ERROR_HEADER;
		}

		if(buffer[i+1] == 0xC0)
			break;                                          // 0xFFC0 is the "Start of frame" marker which contains the file size

		i += 2;                                             // Skip the block marker
		block_length = buffer[i] * 0xFF + buffer[i+1];      // Go to the next block
	}

	current_info.imageWidth    = buffer[i+7]*0x100 + buffer[i+8];
	current_info.imageHeight   = buffer[i+5]*0x100 + buffer[i+6];
	current_info.numComponents = 3; // Unimplemented
	current_info.colorSpace    = CELL_JPG_RGB;

	*info = current_info;

	return CELL_OK;
}

s32 cellJpgDecDecodeData(u32 mainHandle, u32 subHandle, vm::ptr<u8> data, vm::cptr<CellJpgDecDataCtrlParam> dataCtrlParam, vm::ptr<CellJpgDecDataOutInfo> dataOutInfo)
{
	cellJpgDec.Log("cellJpgDecDecodeData(mainHandle=0x%x, subHandle=0x%x, data=*0x%x, dataCtrlParam=*0x%x, dataOutInfo=*0x%x)", mainHandle, subHandle, data, dataCtrlParam, dataOutInfo);

	dataOutInfo->status = CELL_JPGDEC_DEC_STATUS_STOP;

	const auto subHandle_data = Emu.GetIdManager().get<CellJpgDecSubHandle>(subHandle);

	if (!subHandle_data)
	{
		return CELL_JPGDEC_ERROR_FATAL;
	}

	const u32& fd = subHandle_data->fd;
	const u64& fileSize = subHandle_data->fileSize;
	const CellJpgDecOutParam& current_outParam = subHandle_data->outParam; 

	//Copy the JPG file to a buffer
	vm::var<unsigned char[]> jpg((u32)fileSize);

	switch(subHandle_data->src.srcSelect.data())
	{
	case se32(CELL_JPGDEC_BUFFER):
		memmove(jpg.begin(), vm::get_ptr<void>(subHandle_data->src.streamPtr), jpg.size());
		break;

	case se32(CELL_JPGDEC_FILE):
	{
		auto file = Emu.GetIdManager().get<lv2_file_t>(fd);
		file->file->Seek(0);
		file->file->Read(jpg.ptr(), jpg.size());
		break;
	}
	}

	//Decode JPG file. (TODO: Is there any faster alternative? Can we do it without external libraries?)
	int width, height, actual_components;
	auto image = std::unique_ptr<unsigned char,decltype(&::free)>
		(
			stbi_load_from_memory(jpg.ptr(), (s32)fileSize, &width, &height, &actual_components, 4),
			&::free
		);

	if (!image)
		return CELL_JPGDEC_ERROR_STREAM_FORMAT;

	const bool flip = current_outParam.outputMode == CELL_JPGDEC_BOTTOM_TO_TOP;
	const int bytesPerLine = (u32)dataCtrlParam->outputBytesPerLine;
	size_t image_size = width * height;

	switch((u32)current_outParam.outputColorSpace)
	{
	case CELL_JPG_RGB:
	case CELL_JPG_RGBA:
	{
		const char nComponents = current_outParam.outputColorSpace == CELL_JPG_RGBA ? 4 : 3;
		image_size *= nComponents;
		if (bytesPerLine > width * nComponents || flip) //check if we need padding
		{
			const int linesize = std::min(bytesPerLine, width * nComponents);
			for (int i = 0; i < height; i++)
			{
				const int dstOffset = i * bytesPerLine;
				const int srcOffset = width * nComponents * (flip ? height - i - 1 : i);
				memcpy(&data[dstOffset], &image.get()[srcOffset], linesize);
			}
		}
		else
		{
			memcpy(data.get_ptr(), image.get(), image_size);
		}
	}
	break;

	case CELL_JPG_ARGB:
	{
		const int nComponents = 4;
		image_size *= nComponents;
		if (bytesPerLine > width * nComponents || flip) //check if we need padding
		{
			//TODO: Find out if we can't do padding without an extra copy
			const int linesize = std::min(bytesPerLine, width * nComponents);
			char *output = (char *) malloc(linesize);
			for (int i = 0; i < height; i++)
			{
				const int dstOffset = i * bytesPerLine;
				const int srcOffset = width * nComponents * (flip ? height - i - 1 : i);
				for (int j = 0; j < linesize; j += nComponents)
				{
					output[j + 0] = image.get()[srcOffset + j + 3];
					output[j + 1] = image.get()[srcOffset + j + 0];
					output[j + 2] = image.get()[srcOffset + j + 1];
					output[j + 3] = image.get()[srcOffset + j + 2];
				}
				memcpy(&data[dstOffset], output, linesize);
			}
			free(output);
		}
		else
		{
			uint* img = (uint*)new char[image_size];
			uint* source_current = (uint*)&(image.get()[0]);
			uint* dest_current = img;
			for (uint i = 0; i < image_size / nComponents; i++) 
			{
				uint val = *source_current;
				*dest_current = (val >> 24) | (val << 8); // set alpha (A8) as leftmost byte
				source_current++;
				dest_current++;
			}
			memcpy(data.get_ptr(), img, image_size); 
			delete[] img;
		}
	}
	break;

	case CELL_JPG_GRAYSCALE:
	case CELL_JPG_YCbCr:
	case CELL_JPG_UPSAMPLE_ONLY:
	case CELL_JPG_GRAYSCALE_TO_ALPHA_RGBA:
	case CELL_JPG_GRAYSCALE_TO_ALPHA_ARGB:
		cellJpgDec.Error("cellJpgDecDecodeData: Unsupported color space (%d)", current_outParam.outputColorSpace);
	break;

	default:
		return CELL_JPGDEC_ERROR_ARG;
	}

	dataOutInfo->status = CELL_JPGDEC_DEC_STATUS_FINISH;

	if(dataCtrlParam->outputBytesPerLine)
		dataOutInfo->outputLines = (u32)(image_size / dataCtrlParam->outputBytesPerLine);

	return CELL_OK;
}

s32 cellJpgDecSetParameter(u32 mainHandle, u32 subHandle, vm::cptr<CellJpgDecInParam> inParam, vm::ptr<CellJpgDecOutParam> outParam)
{
	cellJpgDec.Log("cellJpgDecSetParameter(mainHandle=0x%x, subHandle=0x%x, inParam=*0x%x, outParam=*0x%x)", mainHandle, subHandle, inParam, outParam);

	const auto subHandle_data = Emu.GetIdManager().get<CellJpgDecSubHandle>(subHandle);

	if (!subHandle_data)
	{
		return CELL_JPGDEC_ERROR_FATAL;
	}

	CellJpgDecInfo& current_info = subHandle_data->info;
	CellJpgDecOutParam& current_outParam = subHandle_data->outParam;

	current_outParam.outputWidthByte  = (current_info.imageWidth * current_info.numComponents);
	current_outParam.outputWidth      = current_info.imageWidth;
	current_outParam.outputHeight     = current_info.imageHeight;
	current_outParam.outputColorSpace = inParam->outputColorSpace;

	switch ((u32)current_outParam.outputColorSpace)
	{
	case CELL_JPG_GRAYSCALE:               current_outParam.outputComponents = 1; break;

	case CELL_JPG_RGB:
	case CELL_JPG_YCbCr:                   current_outParam.outputComponents = 3; break;

	case CELL_JPG_UPSAMPLE_ONLY:           current_outParam.outputComponents = current_info.numComponents; break;

	case CELL_JPG_RGBA:
	case CELL_JPG_ARGB:
	case CELL_JPG_GRAYSCALE_TO_ALPHA_RGBA:
	case CELL_JPG_GRAYSCALE_TO_ALPHA_ARGB: current_outParam.outputComponents = 4; break;

	default: return CELL_JPGDEC_ERROR_ARG; // Not supported color space
	}

	current_outParam.outputMode     = inParam->outputMode;
	current_outParam.downScale      = inParam->downScale;
	current_outParam.useMemorySpace = 0; // Unimplemented

	*outParam = current_outParam;

	return CELL_OK;
}


Module cellJpgDec("cellJpgDec", []()
{
	REG_FUNC(cellJpgDec, cellJpgDecCreate);
	REG_FUNC(cellJpgDec, cellJpgDecExtCreate);
	REG_FUNC(cellJpgDec, cellJpgDecOpen);
	REG_FUNC(cellJpgDec, cellJpgDecReadHeader);
	REG_FUNC(cellJpgDec, cellJpgDecSetParameter);
	REG_FUNC(cellJpgDec, cellJpgDecDecodeData);
	REG_FUNC(cellJpgDec, cellJpgDecClose);
	REG_FUNC(cellJpgDec, cellJpgDecDestroy);

	/*REG_FUNC(cellJpgDec, cellJpgDecExtOpen);
	REG_FUNC(cellJpgDec, cellJpgDecExtReadHeader);
	REG_FUNC(cellJpgDec, cellJpgDecExtSetParameter);
	REG_FUNC(cellJpgDec, cellJpgDecExtDecodeData);*/
});