/*************************************************************************/
/*  scene_cache_interface.h                                              */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#ifndef SCENE_CACHE_INTERFACE_H
#define SCENE_CACHE_INTERFACE_H

#include "scene/main/multiplayer_api.h"

class SceneMultiplayer;

class SceneCacheInterface : public RefCounted {
	GDCLASS(SceneCacheInterface, RefCounted);

private:
	SceneMultiplayer *multiplayer = nullptr;

	//path sent caches
	struct PathSentCache {
		HashMap<int, bool> confirmed_peers;
		int id;
	};

	//path get caches
	struct PathGetCache {
		struct NodeInfo {
			NodePath path;
			ObjectID instance;
		};

		HashMap<int, NodeInfo> nodes;
	};

	HashMap<NodePath, PathSentCache> path_send_cache;
	HashMap<int, PathGetCache> path_get_cache;
	int last_send_cache_id = 1;

protected:
	Error _send_confirm_path(Node *p_node, NodePath p_path, PathSentCache *psc, const List<int> &p_peers);

public:
	void clear();
	void on_peer_change(int p_id, bool p_connected);
	void process_simplify_path(int p_from, const uint8_t *p_packet, int p_packet_len);
	void process_confirm_path(int p_from, const uint8_t *p_packet, int p_packet_len);

	// Returns true if all peers have cached path.
	bool send_object_cache(Object *p_obj, int p_target, int &p_id);
	int make_object_cache(Object *p_obj);
	Object *get_cached_object(int p_from, uint32_t p_cache_id);
	bool is_cache_confirmed(NodePath p_path, int p_peer);

	SceneCacheInterface(SceneMultiplayer *p_multiplayer) { multiplayer = p_multiplayer; }
};

#endif // SCENE_CACHE_INTERFACE_H