#include <vector>
#include <cstdint>
#include <QObject>
#include <chrono>
#include "Pendulum.h"
#include <semaphore>

using namespace std::chrono;

class QTimer;
class FPS;

class Simulation : public QObject {
	Q_OBJECT
public:
	explicit Simulation();

	double sizeMeters = 50;

	double gravity {};
	double timescale {};
	int substeps {};

	double potentialEnergy = 0, kineticEnergy = 0;

	bool isPlaying = false;

	std::vector<Pendulum *> pendula;

	std::binary_semaphore semaphore = std::binary_semaphore(1);
	FPS * ups;

	void updateEnergy();
signals:
	void layoutChanged();
	void positionChanged();
public slots:
	void clearPendula();
	void addPendula(const std::vector<Pendulum *> &add);
private slots:
	void update();
private:
	QTimer * timer;
	int updateInterval = 16;
};