#ifndef DRONE_CONTROLLER_HH
#define DRONE_CONTROLLER_HH

#include "opengl_mesh.hh"

#include <QJsonObject>
#include <QVector3D>
#include <QTimer>


template <typename T>
static T lerp(T a, T b, double factor) {
	return a + (factor * (b - a));
}


struct Waypoint {
	int frame;
	QVector3D pos;

	Waypoint(unsigned frame, QVector3D pos);
	Waypoint(const QJsonObject &json);
};


class Drone {
	static OpenGLMesh *mesh;
	static bool mesh_initialized;

	QVector<Waypoint> waypoints;
	int mesh_id;

public:
	Drone();
	Drone(const QJsonObject &json);
	const QVector<Waypoint> getWaypoints() const;
	void setTo(int frame);
};


class DroneController : public QObject {
	Q_OBJECT

	int framerate;
	int frame = 0;
	int duration = 0;
	QVector<Drone> drones;
	QTimer timer;
	bool paused = true;

public:
	DroneController(const QJsonObject &json);
	int getDuration() const;

signals:
	void frameChanged(int frame);
	void playing();
	void pausing();

private slots:
	void step();

public slots:
	void play();
	void pause();
	void suspend();
	void resume();
	void seek(int frame);
};


#endif