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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * file_sink.cpp - File Sink
 */

#include <assert.h>
#include <fcntl.h>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string.h>
#include <unistd.h>

#include <libcamera/camera.h>

#include "../common/dng_writer.h"
#include "../common/image.h"
#include "../common/ppm_writer.h"

#include "file_sink.h"

using namespace libcamera;

FileSink::FileSink([[maybe_unused]] const libcamera::Camera *camera,
		   const std::map<const libcamera::Stream *, std::string> &streamNames,
		   const std::string &pattern)
	:
#ifdef HAVE_TIFF
	  camera_(camera),
#endif
	  streamNames_(streamNames), pattern_(pattern)
{
}

FileSink::~FileSink()
{
}

int FileSink::configure(const libcamera::CameraConfiguration &config)
{
	int ret = FrameSink::configure(config);
	if (ret < 0)
		return ret;

	return 0;
}

void FileSink::mapBuffer(FrameBuffer *buffer)
{
	std::unique_ptr<Image> image =
		Image::fromFrameBuffer(buffer, Image::MapMode::ReadOnly);
	assert(image != nullptr);

	mappedBuffers_[buffer] = std::move(image);
}

bool FileSink::processRequest(Request *request)
{
	for (auto [stream, buffer] : request->buffers())
		writeBuffer(stream, buffer, request->metadata());

	return true;
}

void FileSink::writeBuffer(const Stream *stream, FrameBuffer *buffer,
			   [[maybe_unused]] const ControlList &metadata)
{
	std::string filename;
	size_t pos;
	int fd, ret = 0;

	if (!pattern_.empty())
		filename = pattern_;

#ifdef HAVE_TIFF
	bool dng = filename.find(".dng", filename.size() - 4) != std::string::npos;
#endif /* HAVE_TIFF */
	bool ppm = filename.find(".ppm", filename.size() - 4) != std::string::npos;

	if (filename.empty() || filename.back() == '/')
		filename += "frame-#.bin";

	pos = filename.find_first_of('#');
	if (pos != std::string::npos) {
		std::stringstream ss;
		ss << streamNames_[stream] << "-" << std::setw(6)
		   << std::setfill('0') << buffer->metadata().sequence;
		filename.replace(pos, 1, ss.str());
	}

	Image *image = mappedBuffers_[buffer].get();

#ifdef HAVE_TIFF
	if (dng) {
		ret = DNGWriter::write(filename.c_str(), camera_,
				       stream->configuration(), metadata,
				       buffer, image->data(0).data());
		if (ret < 0)
			std::cerr << "failed to write DNG file `" << filename
				  << "'" << std::endl;

		return;
	}
#endif /* HAVE_TIFF */
	if (ppm) {
		ret = PPMWriter::write(filename.c_str(), stream->configuration(),
				       image->data(0));
		if (ret < 0)
			std::cerr << "failed to write PPM file `" << filename