#ifndef THROTTLEMANAGER_HH

#define THROTTLEMANAGER_HH

#include "BooleanSetting.hh"

#include "Subject.hh"

namespace openmsx {

class CommandController;

/**

 * Manages the throttle state of openMSX. It depends on the throttle setting,

 * but also on the fullspeedwhenfastloading setting and if the MSX has

 * notified us that it is loading... If you want to know about the throttle

 * status of openMSX, attach to me! (And not just to throttleSetting!)

 */

class ThrottleManager final : public Subject<ThrottleManager>

                            , private Observer<Setting>

{

public:

	explicit ThrottleManager(CommandController& commandController);

	~ThrottleManager();

	/**

	 * Ask if throttling is enabled. Depends on the throttle setting, but

	 * also on the fullspeedwhenfastloading setting and if the MSX has

	 * notified us that it is loading... To be used for the timing.

	 */

	[[nodiscard]] bool isThrottled() const { return throttle; }

	[[nodiscard]] auto& getFullSpeedLoadingSetting() { return fullSpeedLoadingSetting; }

private:

	friend class LoadingIndicator;

	/**

	 * Use to indicate that the MSX is in a loading state, so that full

	 * speed can be enabled. Note that the caller can only call it once,

	 * when the state changes. It may not call it twice in a row with the

	 * same value for the argument.

	 * @param state true for loading, false for not loading

	 */

	void indicateLoadingState(bool state);

	void updateStatus();

	// Observer<Setting>

	void update(const Setting& setting) noexcept override;

private:

	BooleanSetting throttleSetting;

	BooleanSetting fullSpeedLoadingSetting;

	int loading = 0;

	bool throttle = true;

};

/**

 * Used by a device to indicate when it is loading.

 */

class LoadingIndicator

{

public:

	explicit LoadingIndicator(ThrottleManager& throttleManager);

	~LoadingIndicator();

	/**

	 * Called by the device to indicate its loading state may have changed.

	 */

	void update(bool newState);

private:

	ThrottleManager& throttleManager;

	bool isLoading = false;

};

} // namespace openmsx

#endif