/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi (Trading) Limited
 *
 * lux.hpp - Lux control algorithm
 */
#pragma once

#include <mutex>

#include <libcamera/base/utils.h>

#include "../lux_status.h"
#include "../algorithm.hpp"

// This is our implementation of the "lux control algorithm".

namespace RPiController {

class Lux : public Algorithm
{
public:
	Lux(Controller *controller);
	char const *name() const override;
	void read(boost::property_tree::ptree const &params) override;
	void prepare(Metadata *imageMetadata) override;
	void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
	void setCurrentAperture(double aperture);

private:
	// These values define the conditions of the reference image, against
	// which we compare the new image.
	libcamera::utils::Duration referenceShutterSpeed_;
	double referenceGain_;
	double referenceAperture_; // units of 1/f
	double referenceY_; // out of 65536
	double referenceLux_;
	double currentAperture_;
	LuxStatus status_;
	std::mutex mutex_;
};

} // namespace RPiController