#ifndef TRACKBALL_HH

#define TRACKBALL_HH

#include "EmuTime.hh"

#include "JoystickDevice.hh"

#include "MSXEventListener.hh"

#include "StateChangeListener.hh"

#include "serialize_meta.hh"

#include <cstdint>

namespace openmsx {

class MSXEventDistributor;

class StateChangeDistributor;

class Trackball final : public JoystickDevice, private MSXEventListener

                      , private StateChangeListener

{

public:

	Trackball(MSXEventDistributor& eventDistributor,

	          StateChangeDistributor& stateChangeDistributor);

	~Trackball() override;

	template<typename Archive>

	void serialize(Archive& ar, unsigned version);

private:

	void createTrackballStateChange(EmuTime time,

		int deltaX, int deltaY, uint8_t press, uint8_t release);

	void syncCurrentWithTarget(EmuTime time);

	// Pluggable

	[[nodiscard]] zstring_view getName() const override;

	[[nodiscard]] zstring_view getDescription() const override;

	void plugHelper(Connector& connector, EmuTime time) override;

	void unplugHelper(EmuTime time) override;

	// JoystickDevice

	[[nodiscard]] uint8_t read(EmuTime time) override;

	void write(uint8_t value, EmuTime time) override;

	// MSXEventListener

	void signalMSXEvent(const Event& event,

	                    EmuTime time) noexcept override;

	// StateChangeListener

	void signalStateChange(const StateChange& event) override;

	void stopReplay(EmuTime time) noexcept override;

private:

	MSXEventDistributor& eventDistributor;

	StateChangeDistributor& stateChangeDistributor;

	EmuTime lastSync = EmuTime::zero(); // last time we synced current with target

	int8_t targetDeltaX = 0, targetDeltaY = 0; // immediately follows host events

	int8_t currentDeltaX = 0, currentDeltaY = 0; // follows targetXY with some delay

	uint8_t lastValue = 0;

	uint8_t status = JOY_BUTTONA | JOY_BUTTONB;

	bool smooth = true; // always true, except for bw-compat savestates

};

SERIALIZE_CLASS_VERSION(Trackball, 2);

} // namespace openmsx

#endif