#ifndef SCENE_DIFF_H
#define SCENE_DIFF_H

/*************************************************************************/
/*  scene_diff.h                                                         */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

/**
	@author AndreaCatania
*/

#include "core/containers/local_vector.h"
#include "core/object/class_db.h"
#include "net_utilities.h"

class SceneSynchronizer;

struct VarDiff {
	bool is_different = false;
	Variant value;
};

/// This class is used to track the scene changes during a particular period of
/// the frame. You can use it to generate partial FrameSnapshot that contains
/// only portion of a change.
class SceneDiff : public Object {
	GDCLASS(SceneDiff, Object);

	friend class SceneSynchronizer;

	static void _bind_methods();

	uint32_t start_tracking_count = 0;
	LocalVector<LocalVector<Variant>> tracking;
	LocalVector<LocalVector<VarDiff>> diff;

public:
	SceneDiff() = default;

	void start_tracking_scene_changes(const LocalVector<NetUtility::NodeData *> &p_nodes);
	void stop_tracking_scene_changes(const SceneSynchronizer *p_synchronizer);

	bool is_tracking_in_progress() const;
};

#endif // SCENE_DIFF_H