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

#include "core/multiplayer/multiplayer_api.h"

#include "scene/multiplayer/scene_replication_state.h"

class SceneReplicationInterface : public MultiplayerReplicationInterface {
	GDCLASS(SceneReplicationInterface, MultiplayerReplicationInterface);

private:
	void _send_sync(int p_peer, uint64_t p_msec);
	Error _make_spawn_packet(Node *p_node, int &r_len);
	Error _make_despawn_packet(Node *p_node, int &r_len);
	Error _send_raw(const uint8_t *p_buffer, int p_size, int p_peer, bool p_reliable);

	void _visibility_changed(int p_peer, ObjectID p_oid);
	Error _update_sync_visibility(int p_peer, const ObjectID &p_oid);
	Error _update_spawn_visibility(int p_peer, const ObjectID &p_oid);
	void _free_remotes(int p_peer);

	Ref<SceneReplicationState> rep_state;
	MultiplayerAPI *multiplayer = nullptr;
	PackedByteArray packet_cache;
	int sync_mtu = 1350; // Highly dependent on underlying protocol.

	// An hack to apply the initial state before ready.
	ObjectID pending_spawn;
	const uint8_t *pending_buffer = nullptr;
	int pending_buffer_size = 0;

protected:
	static MultiplayerReplicationInterface *_create(MultiplayerAPI *p_multiplayer);

public:
	static void make_default();

	virtual void on_reset() override;
	virtual void on_peer_change(int p_id, bool p_connected) override;

	virtual Error on_spawn(Object *p_obj, Variant p_config) override;
	virtual Error on_despawn(Object *p_obj, Variant p_config) override;
	virtual Error on_replication_start(Object *p_obj, Variant p_config) override;
	virtual Error on_replication_stop(Object *p_obj, Variant p_config) override;
	virtual void on_network_process() override;

	virtual Error on_spawn_receive(int p_from, const uint8_t *p_buffer, int p_buffer_len) override;
	virtual Error on_despawn_receive(int p_from, const uint8_t *p_buffer, int p_buffer_len) override;
	virtual Error on_sync_receive(int p_from, const uint8_t *p_buffer, int p_buffer_len) override;

	SceneReplicationInterface(MultiplayerAPI *p_multiplayer) {
		rep_state.instantiate();
		multiplayer = p_multiplayer;
	}
};

#endif // SCENE_TREE_REPLICATOR_INTERFACE_H