#pragma once

#include <string>

enum class VideoBackendLifecycleState
{
	Uninitialized,
	Discovering,
	Discovered,
	Configuring,
	Configured,
	Prerolling,
	Running,
	Degraded,
	Stopping,
	Stopped,
	Failed
};

struct VideoBackendLifecycleTransition
{
	VideoBackendLifecycleState previous = VideoBackendLifecycleState::Uninitialized;
	VideoBackendLifecycleState current = VideoBackendLifecycleState::Uninitialized;
	bool accepted = false;
	std::string reason;
	std::string errorMessage;
};

class VideoBackendLifecycle
{
public:
	VideoBackendLifecycleState State() const;
	const std::string& FailureReason() const;
	VideoBackendLifecycleTransition TransitionTo(VideoBackendLifecycleState next, const std::string& reason);
	VideoBackendLifecycleTransition Fail(const std::string& reason);

	static bool CanTransition(VideoBackendLifecycleState current, VideoBackendLifecycleState next);
	static const char* StateName(VideoBackendLifecycleState state);

private:
	VideoBackendLifecycleState mState = VideoBackendLifecycleState::Uninitialized;
	std::string mFailureReason;
};