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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * ipa_interface_wrapper.cpp - Image Processing Algorithm interface wrapper
 */

#include "ipa_interface_wrapper.h"

#include <map>
#include <string.h>
#include <unistd.h>
#include <vector>

#include <ipa/ipa_interface.h>

#include "byte_stream_buffer.h"

/**
 * \file ipa_interface_wrapper.h
 * \brief Image Processing Algorithm interface wrapper
 */

namespace libcamera {

/**
 * \class IPAInterfaceWrapper
 * \brief Wrap an IPAInterface and expose it as an ipa_context
 *
 * This class implements the ipa_context API based on a provided IPAInterface.
 * It helps IPAs that implement the IPAInterface API to provide the external
 * ipa_context API.
 *
 * To use the wrapper, an IPA module simple creates a new instance of its
 * IPAInterface implementation, and passes it to the constructor of the
 * IPAInterfaceWrapper. As IPAInterfaceWrapper inherits from ipa_context, the
 * constructed wrapper can then be directly returned from the IPA module's
 * ipaCreate() function.
 *
 * \code{.cpp}
 * class MyIPA : public IPAInterface
 * {
 * 	...
 * };
 *
 * struct ipa_context *ipaCreate()
 * {
 * 	return new IPAInterfaceWrapper(std::make_unique<MyIPA>());
 * }
 * \endcode
 *
 * The wrapper takes ownership of the IPAInterface and will automatically
 * delete it when the wrapper is destroyed.
 */

/**
 * \brief Construct an IPAInterfaceWrapper wrapping \a interface
 * \param[in] interface The interface to wrap
 */
IPAInterfaceWrapper::IPAInterfaceWrapper(std::unique_ptr<IPAInterface> interface)
	: ipa_(std::move(interface)), callbacks_(nullptr), cb_ctx_(nullptr)
{
	ops = &operations_;

	ipa_->queueFrameAction.connect(this, &IPAInterfaceWrapper::queueFrameAction);
}

void IPAInterfaceWrapper::destroy(struct ipa_context *_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	delete ctx;
}

void *IPAInterfaceWrapper::get_interface(struct ipa_context *_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	return ctx->ipa_.get();
}

void IPAInterfaceWrapper::init(struct ipa_context *_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	ctx->ipa_->init();
}

int IPAInterfaceWrapper::start(struct ipa_context *_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	return ctx->ipa_->start();
}

void IPAInterfaceWrapper::stop(struct ipa_context *_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	ctx->ipa_->stop();
}

void IPAInterfaceWrapper::register_callbacks(struct ipa_context *_ctx,
					     const struct ipa_callback_ops *callbacks,
					     void *cb_ctx)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	ctx->callbacks_ = callbacks;
	ctx->cb_ctx_ = cb_ctx;
}

void IPAInterfaceWrapper::configure(struct ipa_context *_ctx,
				    const struct ipa_stream *streams,
				    unsigned int num_streams,
				    const struct ipa_control_info_map *maps,
				    unsigned int num_maps)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);

	ctx->serializer_.reset();

	/* Translate the IPA stream configurations map. */
	std::map<unsigned int, IPAStream> ipaStreams;

	for (unsigned int i = 0; i < num_streams; ++i) {
		const struct ipa_stream &stream = streams[i];

		ipaStreams[stream.id] = {
			stream.pixel_format,
			Size(stream.width, stream.height),
		};
	}

	/* Translate the IPA entity controls map. */
	std::map<unsigned int, const ControlInfoMap &> entityControls;
	std::map<unsigned int, ControlInfoMap> infoMaps;

	for (unsigned int i = 0; i < num_maps; ++i) {
		const struct ipa_control_info_map &ipa_map = maps[i];
		ByteStreamBuffer byteStream(ipa_map.data, ipa_map.size);
		unsigned int id = ipa_map.id;

		infoMaps[id] = ctx->serializer_.deserialize<ControlInfoMap>(byteStream);
		entityControls.emplace(id, infoMaps[id]);
	}

	ctx->ipa_->configure(ipaStreams, entityControls);
}

void IPAInterfaceWrapper::map_buffers(struct ipa_context *_ctx,
				      const struct ipa_buffer *_buffers,
				      size_t num_buffers)
{
	IPAInterfaceWrapper *ctx = static_cast<IPAInterfaceWrapper *>(_ctx);
	std::vector<IPABuffer> buffers(num_buffers);

	for (unsigned int i = 0; i < num_buffers; ++i) {
		const struct ipa_buffer &_buffer = _buffers[i];
		IPABuffer &buffer = buffers[i];
		std::vector<FrameBuffer::Plane> &planes = buffer.planes;

		buffer.id = _buffer.id;

		planes.resize(_buffer.num_planes);
		for (unsigned int j = 0; j < _buffer.num_planes; ++j) {
			planes[j].fd = FileDescriptor(_buffer.planes[j].dmabuf);
			planes[j].length = _buffer.planes[j].length;
		}
	}

	ctx->ipa_->mapBuffers(buffers);
}

void IPAInterfaceWrapper::unmap_buffers(struct ipa_context *_ctx,
					const unsigned int *_ids,