/**
 *    Copyright (C) 2016-2021 Grok Image Compression Inc.
 *
 *    This source code is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This source code is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "grk_includes.h"

namespace grk
{
// Performed after T2, just before plugin decompress is triggered
// note: only support single segment at the moment
void decompress_synch_plugin_with_host(TileProcessor* tcd)
{
	if(tcd->current_plugin_tile && tcd->current_plugin_tile->tileComponents)
	{
		auto tile = tcd->tile;
		for(uint32_t compno = 0; compno < tile->numcomps; compno++)
		{
			auto tilec = &tile->comps[compno];
			auto plugin_tilec = tcd->current_plugin_tile->tileComponents[compno];
			assert(tilec->numresolutions == plugin_tilec->numResolutions);
			for(uint32_t resno = 0; resno < tilec->numresolutions; resno++)
			{
				auto res = &tilec->tileCompResolution[resno];
				auto plugin_res = plugin_tilec->resolutions[resno];
				assert(plugin_res->numBands == res->numTileBandWindows);
				for(uint32_t bandIndex = 0; bandIndex < res->numTileBandWindows; bandIndex++)
				{
					auto band = &res->tileBand[bandIndex];
					auto plugin_band = plugin_res->band[bandIndex];
					assert(plugin_band->numPrecincts ==
						   (uint64_t)res->precinctGridWidth * res->precinctGridHeight);
					//!!!! plugin still uses stepsize/2
					plugin_band->stepsize = band->stepsize / 2;
					for(auto prc : band->precincts)
					{
						auto plugin_prc = plugin_band->precincts[prc->precinctIndex];
						assert(plugin_prc->numBlocks == prc->getNumCblks());
						for(uint64_t cblkno = 0; cblkno < prc->getNumCblks(); cblkno++)
						{
							auto cblk = prc->getDecompressedBlockPtr(cblkno);
							if(!cblk->getNumSegments())
								continue;
							// sanity check
							if(cblk->getNumSegments() != 1)
							{
								GRK_INFO("Plugin does not handle code blocks with multiple "
										 "segments. Image will be decompressed on CPU.");
								throw PluginDecodeUnsupportedException();
							}
							uint32_t maxPasses =
								3 *
								(uint32_t)((tcd->headerImage->comps[0].prec + BIBO_EXTRA_BITS) - 2);
							if(cblk->getSegment(0)->numpasses > maxPasses)
							{
								GRK_INFO("Number of passes %u in segment exceeds BIBO maximum %u. "
										 "Image will be decompressed on CPU.",
										 cblk->getSegment(0)->numpasses, maxPasses);
								throw PluginDecodeUnsupportedException();
							}

							auto plugin_cblk = plugin_prc->blocks[cblkno];

							// copy segments into plugin codeblock buffer, and point host code block
							// data to plugin data buffer
							plugin_cblk->compressedDataLength = (uint32_t)cblk->getSegBuffersLen();
							cblk->copyToContiguousBuffer(plugin_cblk->compressedData);
							cblk->compressedStream.buf = plugin_cblk->compressedData;
							cblk->compressedStream.len = plugin_cblk->compressedDataLength;
							cblk->compressedStream.owns_data = false;
							plugin_cblk->numBitPlanes = cblk->numbps;
							plugin_cblk->numPasses = cblk->getSegment(0)->numpasses;
						}
					}
				}
			}
		}
	}
}

bool tile_equals(grk_plugin_tile* plugin_tile, Tile* tilePtr)
{
	uint32_t state = grk_plugin_get_debug_state();
	if(!(state & GRK_PLUGIN_STATE_DEBUG))
		return true;
	if((!plugin_tile && tilePtr) || (plugin_tile && !tilePtr))
		return false;
	if(!plugin_tile && !tilePtr)
		return true;
	if(plugin_tile->numComponents != tilePtr->numcomps)
		return false;
	for(uint32_t compno = 0; compno < tilePtr->numcomps; ++compno)
	{
		auto tilecomp = tilePtr->comps + compno;
		auto plugin_tilecomp = plugin_tile->tileComponents[compno];
		if(tilecomp->numresolutions != plugin_tilecomp->numResolutions)
			return false;
		for(uint32_t resno = 0; resno < tilecomp->numresolutions; ++resno)
		{
			auto resolution = tilecomp->tileCompResolution + resno;
			auto plugin_resolution = plugin_tilecomp->resolutions[resno];
			if(resolution->numTileBandWindows != plugin_resolution->numBands)
				return false;
			for(uint32_t bandIndex = 0; bandIndex < resolution->numTileBandWindows; ++bandIndex)
			{
				auto band = resolution->tileBand + bandIndex;
				auto plugin_band = plugin_resolution->band[bandIndex];
				size_t num_precincts = band->numPrecincts;
				if(num_precincts != plugin_band->numPrecincts)
					return false;
				for(auto precinct : band->precincts)
				{
					auto plugin_precinct = plugin_band->precincts[precinct->precinctIndex];
					uint64_t numBlocks = precinct->getNumCblks();
					if(numBlocks != plugin_precinct->numBlocks)
					{
						return false;
					}
					for(uint64_t cblkno = 0; cblkno < numBlocks; ++cblkno)
					{
						auto cblk = precinct->getDecompressedBlockPtr(cblkno);
						auto plugin_cblk = plugin_precinct->blocks[cblkno];
						if(cblk->x0 != plugin_cblk->x0 || cblk->x1 != plugin_cblk->x1 ||
						   cblk->y0 != plugin_cblk->y0 || cblk->y1 != plugin_cblk->y1)
							return false;
					}
				}
			}
		}
	}
	return true;
}

void compress_synch_with_plugin(TileProcessor* tcd, uint32_t compno, uint32_t resno,
								uint32_t bandIndex, uint64_t precinctIndex, uint64_t cblkno,
								Subband* band, CompressCodeblock* cblk, uint32_t* numPix)
{
	if(tcd->current_plugin_tile && tcd->current_plugin_tile->tileComponents)
	{
		auto plugin_band =
			tcd->current_plugin_tile->tileComponents[compno]->resolutions[resno]->band[bandIndex];
		auto precinct = plugin_band->precincts[precinctIndex];
		auto plugin_cblk = precinct->blocks[cblkno];
		uint32_t state = grk_plugin_get_debug_state();

		if(state & GRK_PLUGIN_STATE_DEBUG)
		{
			if(band->stepsize != plugin_band->stepsize)
			{
				GRK_WARN("ojp band step size %d differs from plugin step size %d", band->stepsize,
						 plugin_band->stepsize);
			}
			if(cblk->numPassesTotal != plugin_cblk->numPasses)
				GRK_WARN(
					"CPU total number of passes (%d) differs from "
					"plugin total number of passes (%d) : component=%d, res=%d, band=%d, block=%d",
					cblk->numPassesTotal, (uint32_t)plugin_cblk->numPasses, compno, resno,
					bandIndex, cblkno);
		}

		cblk->numPassesTotal = (uint32_t)plugin_cblk->numPasses;
		*numPix = (uint32_t)plugin_cblk->numPix;

		if(state & GRK_PLUGIN_STATE_DEBUG)
		{
			uint32_t grkNumPix = (uint32_t)cblk->area();
			if(plugin_cblk->numPix != grkNumPix)
				GRK_WARN("ojp numPix %u differs from plugin numPix %u", grkNumPix,
						 plugin_cblk->numPix);
		}

		bool goodData = true;
		uint16_t totalRatePlugin = (uint16_t)plugin_cblk->compressedDataLength;

		// check data
		if(state & GRK_PLUGIN_STATE_DEBUG)
		{
			uint32_t totalRate = 0;
			if(cblk->numPassesTotal > 0)
			{
				totalRate = (cblk->passes + cblk->numPassesTotal - 1)->rate;
				if(totalRatePlugin != totalRate)
				{
					GRK_WARN("CPU rate %d differs from plugin rate %d", totalRate, totalRatePlugin);
				}
			}

			for(uint32_t p = 0; p < totalRate; ++p)
			{
				if(cblk->paddedCompressedStream[p] != plugin_cblk->compressedData[p])
				{
					GRK_WARN("data differs at position=%d, component=%d, res=%d, band=%d, "
							 "block=%d, CPU rate =%d, plugin rate=%d",
							 p, compno, resno, bandIndex, cblkno, totalRate, totalRatePlugin);
					goodData = false;
					break;
				}
			}
		}

		if(goodData)
			cblk->paddedCompressedStream = plugin_cblk->compressedData;
		cblk->compressedStream.len = (uint32_t)(plugin_cblk->compressedDataLength);
		cblk->compressedStream.owns_data = false;
		cblk->numbps = plugin_cblk->numBitPlanes;
		if(state & GRK_PLUGIN_STATE_DEBUG)
		{
			if(cblk->x0 != plugin_cblk->x0 || cblk->y0 != plugin_cblk->y0 ||
			   cblk->x1 != plugin_cblk->x1 || cblk->y1 != plugin_cblk->y1)
			{
				GRK_ERROR("CPU code block bounding box differs from plugin code block");
			}
		}

		uint32_t lastRate = 0;
		for(uint32_t passno = 0; passno < cblk->numPassesTotal; passno++)
		{
			auto pass = cblk->passes + passno;
			auto pluginPass = plugin_cblk->passes + passno;

			// synch distortion, if applicable
			if(tcd->needsRateControl())
			{
				if(state & GRK_PLUGIN_STATE_DEBUG)
				{
					if(fabs(pass->distortiondec - pluginPass->distortionDecrease) /
						   fabs(pass->distortiondec) >
					   0.01)
					{
						GRK_WARN("distortion decrease for pass %d differs between plugin and OPJ:  "
								 "plugin: %d, OPJ : %d",
								 passno, pluginPass->distortionDecrease, pass->distortiondec);
					}
				}
				pass->distortiondec = pluginPass->distortionDecrease;
			}
			uint16_t pluginRate = (uint16_t)(pluginPass->rate + 1);
			if(pluginRate > totalRatePlugin)
				pluginRate = totalRatePlugin;

			// Preventing generation of FF as last data byte of a pass
			if((pluginRate > 1) && (plugin_cblk->compressedData[pluginRate - 1] == 0xFF))
			{
				pluginRate--;
			}

			if(state & GRK_PLUGIN_STATE_DEBUG)
			{
				if(pluginRate != pass->rate)
				{
					GRK_WARN("CPU rate %d differs from plugin rate %d", pass->rate, pluginRate);
				}
			}

			pass->rate = pluginRate;
			pass->len = (uint16_t)(pass->rate - lastRate);
			lastRate = pass->rate;
		}
	}
}

// set context stream for debugging purposes
void set_context_stream(TileProcessor* p_tileProcessor)
{
	for(uint32_t compno = 0; compno < p_tileProcessor->tile->numcomps; compno++)
	{
		auto tilec = p_tileProcessor->tile->comps + compno;
		for(uint32_t resno = 0; resno < tilec->numresolutions; resno++)
		{
			auto res = &tilec->tileCompResolution[resno];
			for(uint32_t bandIndex = 0; bandIndex < res->numTileBandWindows; bandIndex++)
			{
				auto band = &res->tileBand[bandIndex];
				for(auto prc : band->precincts)
				{
					for(uint64_t cblkno = 0; cblkno < prc->getNumCblks(); cblkno++)
					{
						auto cblk = prc->getCompressedBlockPtr(cblkno);
						if(p_tileProcessor->current_plugin_tile &&
						   p_tileProcessor->current_plugin_tile->tileComponents)
						{
							auto comp =
								p_tileProcessor->current_plugin_tile->tileComponents[compno];
							if(resno < comp->numResolutions)
							{
								auto plugin_band = comp->resolutions[resno]->band[bandIndex];
								auto precinct = plugin_band->precincts[prc->precinctIndex];
								auto plugin_cblk = precinct->blocks[cblkno];
								cblk->contextStream = plugin_cblk->contextStream;
							}
						}
					}
				}
			}
		}
	}
}

static const char* plugin_debug_mqc_next_cxd_method_name = "plugin_debug_mqc_next_cxd";
static const char* plugin_debug_mqc_next_plane_method_name = "plugin_debug_mqc_next_plane";

// Debug: these methods wrap plugin methods for parsing a context stream
void mqc_next_plane(grk_plugin_debug_mqc* mqc)
{
	auto mgr = minpf_get_plugin_manager();
	if(mgr && mgr->num_libraries > 0)
	{
		auto func = (PLUGIN_DEBUG_MQC_NEXT_PLANE)minpf_get_symbol(
			mgr->dynamic_libraries[0], plugin_debug_mqc_next_plane_method_name);
		if(func)
			func(mqc);
	}
}
void nextCXD(grk_plugin_debug_mqc* mqc, uint32_t d)
{
	auto mgr = minpf_get_plugin_manager();
	if(mgr && mgr->num_libraries > 0)
	{
		auto func = (PLUGIN_DEBUG_MQC_NEXT_CXD)minpf_get_symbol(
			mgr->dynamic_libraries[0], plugin_debug_mqc_next_cxd_method_name);
		if(func)
			func(mqc, d);
	}
}

} // namespace grk
