#ifndef NAVIGATION_SERVER_H
#define NAVIGATION_SERVER_H

/*************************************************************************/
/*  navigation_server.h                                                  */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "core/containers/rid.h"
#include "core/object/object.h"

#include "navigation/navigation_utilities.h"

#include "core/object/reference.h"

class NavigationMesh;
class SpatialMaterial;
class NavigationPathQueryParameters3D;
class NavigationPathQueryResult3D;

/// This server uses the concept of internal mutability.
/// All the constant functions can be called in multithread because internally
/// the server takes care to schedule the functions access.
///
/// Note: All the `set` functions are commands executed during the `sync` phase,
/// don't expect that a change is immediately propagated.
class NavigationServer : public Object {
	GDCLASS(NavigationServer, Object);

	static NavigationServer *singleton;

protected:
	static void _bind_methods();

public:
	static NavigationServer *get_singleton();

	virtual Array get_maps() const = 0;

	/// Create a new map.
	virtual RID map_create() = 0;

	/// Set map active.
	virtual void map_set_active(RID p_map, bool p_active) = 0;

	/// Returns true if the map is active.
	virtual bool map_is_active(RID p_map) const = 0;

	/// Set the map UP direction.
	virtual void map_set_up(RID p_map, Vector3 p_up) = 0;

	/// Returns the map UP direction.
	virtual Vector3 map_get_up(RID p_map) const = 0;

	/// Set the map cell size used to weld the navigation mesh polygons.
	virtual void map_set_cell_size(RID p_map, real_t p_cell_size) = 0;

	/// Returns the map cell size.
	virtual real_t map_get_cell_size(RID p_map) const = 0;

	virtual void map_set_use_edge_connections(RID p_map, bool p_enabled) = 0;
	virtual bool map_get_use_edge_connections(RID p_map) const = 0;

	/// Set the map cell height used to weld the navigation mesh polygons.
	virtual void map_set_cell_height(RID p_map, real_t p_cell_height) = 0;

	/// Returns the map cell height.
	virtual real_t map_get_cell_height(RID p_map) const = 0;

	/// Set the map edge connection margin used to weld the compatible region edges.
	virtual void map_set_edge_connection_margin(RID p_map, real_t p_connection_margin) = 0;

	/// Returns the edge connection margin of this map.
	virtual real_t map_get_edge_connection_margin(RID p_map) const = 0;

	/// Set the map link connection radius used to attach links to the nav mesh.
	virtual void map_set_link_connection_radius(RID p_map, real_t p_connection_radius) = 0;

	/// Returns the link connection radius of this map.
	virtual real_t map_get_link_connection_radius(RID p_map) const = 0;

	/// Returns the navigation path to reach the destination from the origin.
	virtual Vector<Vector3> map_get_path(RID p_map, Vector3 p_origin, Vector3 p_destination, bool p_optimize, uint32_t p_navigation_layers = 1) const = 0;

	virtual Vector3 map_get_closest_point_to_segment(RID p_map, const Vector3 &p_from, const Vector3 &p_to, const bool p_use_collision = false) const = 0;
	virtual Vector3 map_get_closest_point(RID p_map, const Vector3 &p_point) const = 0;
	virtual Vector3 map_get_closest_point_normal(RID p_map, const Vector3 &p_point) const = 0;
	virtual RID map_get_closest_point_owner(RID p_map, const Vector3 &p_point) const = 0;

	virtual Array map_get_links(RID p_map) const = 0;
	virtual Array map_get_regions(RID p_map) const = 0;
	virtual Array map_get_agents(RID p_map) const = 0;
	virtual Array map_get_obstacles(RID p_map) const = 0;

	virtual void map_force_update(RID p_map) = 0;

	/// Creates a new region.
	virtual RID region_create() = 0;

	virtual void region_set_enabled(RID p_region, bool p_enabled) = 0;
	virtual bool region_get_enabled(RID p_region) const = 0;

	virtual void region_set_use_edge_connections(RID p_region, bool p_enabled) = 0;
	virtual bool region_get_use_edge_connections(RID p_region) const = 0;

	/// Set the enter_cost of a region
	virtual void region_set_enter_cost(RID p_region, real_t p_enter_cost) = 0;
	virtual real_t region_get_enter_cost(RID p_region) const = 0;

	/// Set the travel_cost of a region
	virtual void region_set_travel_cost(RID p_region, real_t p_travel_cost) = 0;
	virtual real_t region_get_travel_cost(RID p_region) const = 0;

	/// Set the node which manages this region.
	virtual void region_set_owner_id(RID p_region, ObjectID p_owner_id) = 0;
	virtual ObjectID region_get_owner_id(RID p_region) const = 0;

	virtual bool region_owns_point(RID p_region, const Vector3 &p_point) const = 0;

	/// Set the map of this region.
	virtual void region_set_map(RID p_region, RID p_map) = 0;
	virtual RID region_get_map(RID p_region) const = 0;

	/// Set the region's layers
	virtual void region_set_navigation_layers(RID p_region, uint32_t p_navigation_layers) = 0;
	virtual uint32_t region_get_navigation_layers(RID p_region) const = 0;

	/// Set the global transformation of this region.
	virtual void region_set_transform(RID p_region, Transform p_transform) = 0;

	/// Set the navigation mesh of this region.
	virtual void region_set_navigation_mesh(RID p_region, Ref<NavigationMesh> p_navigation_mesh) = 0;

	/// Get a list of a region's connection to other regions.
	virtual int region_get_connections_count(RID p_region) const = 0;
	virtual Vector3 region_get_connection_pathway_start(RID p_region, int p_connection_id) const = 0;
	virtual Vector3 region_get_connection_pathway_end(RID p_region, int p_connection_id) const = 0;

	/// Creates a new link between positions in the nav map.
	virtual RID link_create() = 0;

	/// Set the map of this link.
	virtual void link_set_map(RID p_link, RID p_map) = 0;
	virtual RID link_get_map(RID p_link) const = 0;

	virtual void link_set_enabled(RID p_link, bool p_enabled) = 0;
	virtual bool link_get_enabled(RID p_link) const = 0;

	/// Set whether this link travels in both directions.
	virtual void link_set_bidirectional(RID p_link, bool p_bidirectional) = 0;
	virtual bool link_is_bidirectional(RID p_link) const = 0;

	/// Set the link's layers.
	virtual void link_set_navigation_layers(RID p_link, uint32_t p_navigation_layers) = 0;
	virtual uint32_t link_get_navigation_layers(RID p_link) const = 0;

	/// Set the start position of the link.
	virtual void link_set_start_position(RID p_link, Vector3 p_position) = 0;
	virtual Vector3 link_get_start_position(RID p_link) const = 0;

	/// Set the end position of the link.
	virtual void link_set_end_position(RID p_link, Vector3 p_position) = 0;
	virtual Vector3 link_get_end_position(RID p_link) const = 0;

	/// Set the enter cost of the link.
	virtual void link_set_enter_cost(RID p_link, real_t p_enter_cost) = 0;
	virtual real_t link_get_enter_cost(RID p_link) const = 0;

	/// Set the travel cost of the link.
	virtual void link_set_travel_cost(RID p_link, real_t p_travel_cost) = 0;
	virtual real_t link_get_travel_cost(RID p_link) const = 0;

	/// Set the node which manages this link.
	virtual void link_set_owner_id(RID p_link, ObjectID p_owner_id) = 0;
	virtual ObjectID link_get_owner_id(RID p_link) const = 0;

	/// Creates the agent.
	virtual RID agent_create() = 0;

	/// Put the agent in the map.
	virtual void agent_set_map(RID p_agent, RID p_map) = 0;
	virtual RID agent_get_map(RID p_agent) const = 0;

	virtual void agent_set_paused(RID p_agent, bool p_paused) = 0;
	virtual bool agent_get_paused(RID p_agent) const = 0;

	virtual void agent_set_avoidance_enabled(RID p_agent, bool p_enabled) = 0;
	virtual bool agent_get_avoidance_enabled(RID p_agent) const = 0;

	virtual void agent_set_use_3d_avoidance(RID p_agent, bool p_enabled) = 0;
	virtual bool agent_get_use_3d_avoidance(RID p_agent) const = 0;

	/// The maximum distance (center point to
	/// center point) to other agents this agent
	/// takes into account in the navigation. The
	/// larger this number, the longer the running
	/// time of the simulation. If the number is too
	/// low, the simulation will not be safe.
	/// Must be non-negative.
	virtual void agent_set_neighbor_distance(RID p_agent, real_t p_dist) = 0;

	/// The maximum number of other agents this
	/// agent takes into account in the navigation.
	/// The larger this number, the longer the
	/// running time of the simulation. If the
	/// number is too low, the simulation will not
	/// be safe.
	virtual void agent_set_max_neighbors(RID p_agent, int p_count) = 0;

	// Sets the minimum amount of time in seconds that an agent's
	// must be able to stay on the calculated velocity while still avoiding collisions with agent's
	// if this value is set to high an agent will often fall back to using a very low velocity just to be safe
	virtual void agent_set_time_horizon_agents(RID p_agent, real_t p_time_horizon) = 0;

	/// Sets the minimum amount of time in seconds that an agent's
	// must be able to stay on the calculated velocity while still avoiding collisions with obstacle's
	// if this value is set to high an agent will often fall back to using a very low velocity just to be safe
	virtual void agent_set_time_horizon_obstacles(RID p_agent, real_t p_time_horizon) = 0;

	/// The radius of this agent.
	/// Must be non-negative.
	virtual void agent_set_radius(RID p_agent, real_t p_radius) = 0;
	virtual void agent_set_height(RID p_agent, real_t p_height) = 0;

	/// The maximum speed of this agent.
	/// Must be non-negative.
	virtual void agent_set_max_speed(RID p_agent, real_t p_max_speed) = 0;

	/// forces and agent velocity change in the avoidance simulation, adds simulation instability if done recklessly
	virtual void agent_set_velocity_forced(RID p_agent, Vector3 p_velocity) = 0;

	/// The wanted velocity for the agent as a "suggestion" to the avoidance simulation.
	/// The simulation will try to fulfil this velocity wish if possible but may change the velocity depending on other agent's and obstacles'.
	virtual void agent_set_velocity(RID p_agent, Vector3 p_velocity) = 0;

	/// Position of the agent in world space.
	virtual void agent_set_position(RID p_agent, Vector3 p_position) = 0;

	/// Returns true if the map got changed the previous frame.
	virtual bool agent_is_map_changed(RID p_agent) const = 0;

	/// Callback called at the end of the RVO process
	virtual void agent_set_avoidance_callback(RID p_agent, ObjectID p_object_id, StringName p_method, Variant p_udata = Variant()) = 0;

	virtual void agent_set_avoidance_layers(RID p_agent, uint32_t p_layers) = 0;
	virtual void agent_set_avoidance_mask(RID p_agent, uint32_t p_mask) = 0;
	virtual void agent_set_avoidance_priority(RID p_agent, real_t p_priority) = 0;

	/// Creates the obstacle.
	virtual RID obstacle_create() = 0;
	virtual void obstacle_set_map(RID p_obstacle, RID p_map) = 0;
	virtual RID obstacle_get_map(RID p_obstacle) const = 0;
	virtual void obstacle_set_avoidance_enabled(RID p_obstacle, bool p_enabled) = 0;
	virtual bool obstacle_get_avoidance_enabled(RID p_obstacle) const = 0;
	virtual void obstacle_set_use_3d_avoidance(RID p_obstacle, bool p_enabled) = 0;
	virtual bool obstacle_get_use_3d_avoidance(RID p_obstacle) const = 0;
	virtual void obstacle_set_radius(RID p_obstacle, real_t p_radius) = 0;
	virtual void obstacle_set_paused(RID p_obstacle, bool p_paused) = 0;
	virtual bool obstacle_get_paused(RID p_obstacle) const = 0;
	virtual void obstacle_set_height(RID p_obstacle, real_t p_height) = 0;
	virtual void obstacle_set_velocity(RID p_obstacle, Vector3 p_velocity) = 0;
	virtual void obstacle_set_position(RID p_obstacle, Vector3 p_position) = 0;
	virtual void obstacle_set_vertices(RID p_obstacle, const Vector<Vector3> &p_vertices) = 0;
	virtual void obstacle_set_avoidance_layers(RID p_obstacle, uint32_t p_layers) = 0;

	/// Destroy the `RID`
	virtual void free(RID p_object) = 0;

	/// Control activation of this server.
	virtual void set_active(bool p_active) = 0;

	/// Process the collision avoidance agents.
	/// The result of this process is needed by the physics server,
	/// so this must be called in the main thread.
	/// Note: This function is not thread safe.
	virtual void process(real_t delta_time) = 0;

	/// Returns a customized navigation path using a query parameters object
	void query_path(const Ref<NavigationPathQueryParameters3D> &p_query_parameters, Ref<NavigationPathQueryResult3D> p_query_result) const;

	virtual NavigationUtilities::PathQueryResult _query_path(const NavigationUtilities::PathQueryParameters &p_parameters) const = 0;

	virtual void init();
	virtual void finish();

	enum ProcessInfo {
		INFO_ACTIVE_MAPS,
		INFO_REGION_COUNT,
		INFO_AGENT_COUNT,
		INFO_LINK_COUNT,
		INFO_POLYGON_COUNT,
		INFO_EDGE_COUNT,
		INFO_EDGE_MERGE_COUNT,
		INFO_EDGE_CONNECTION_COUNT,
		INFO_EDGE_FREE_COUNT,
	};

	virtual int get_process_info(ProcessInfo p_info) const = 0;

	NavigationServer();
	virtual ~NavigationServer();

	void set_debug_enabled(bool p_enabled);
	bool get_debug_enabled() const;

#ifdef DEBUG_ENABLED
	void set_debug_navigation_enabled(bool p_enabled);
	bool get_debug_navigation_enabled() const;

	void set_debug_avoidance_enabled(bool p_enabled);
	bool get_debug_avoidance_enabled() const;

	void set_debug_navigation_edge_connection_color(const Color &p_color);
	Color get_debug_navigation_edge_connection_color() const;

	void set_debug_navigation_geometry_edge_color(const Color &p_color);
	Color get_debug_navigation_geometry_edge_color() const;

	void set_debug_navigation_geometry_face_color(const Color &p_color);
	Color get_debug_navigation_geometry_face_color() const;

	void set_debug_navigation_geometry_edge_disabled_color(const Color &p_color);
	Color get_debug_navigation_geometry_edge_disabled_color() const;

	void set_debug_navigation_geometry_face_disabled_color(const Color &p_color);
	Color get_debug_navigation_geometry_face_disabled_color() const;

	void set_debug_navigation_link_connection_color(const Color &p_color);
	Color get_debug_navigation_link_connection_color() const;

	void set_debug_navigation_link_connection_disabled_color(const Color &p_color);
	Color get_debug_navigation_link_connection_disabled_color() const;

	void set_debug_navigation_agent_path_color(const Color &p_color);
	Color get_debug_navigation_agent_path_color() const;

	void set_debug_navigation_avoidance_agents_radius_color(const Color &p_color);
	Color get_debug_navigation_avoidance_agents_radius_color() const;

	void set_debug_navigation_avoidance_obstacles_radius_color(const Color &p_color);
	Color get_debug_navigation_avoidance_obstacles_radius_color() const;

	void set_debug_navigation_avoidance_static_obstacle_pushin_face_color(const Color &p_color);
	Color get_debug_navigation_avoidance_static_obstacle_pushin_face_color() const;

	void set_debug_navigation_avoidance_static_obstacle_pushout_face_color(const Color &p_color);
	Color get_debug_navigation_avoidance_static_obstacle_pushout_face_color() const;

	void set_debug_navigation_avoidance_static_obstacle_pushin_edge_color(const Color &p_color);
	Color get_debug_navigation_avoidance_static_obstacle_pushin_edge_color() const;

	void set_debug_navigation_avoidance_static_obstacle_pushout_edge_color(const Color &p_color);
	Color get_debug_navigation_avoidance_static_obstacle_pushout_edge_color() const;

	void set_debug_navigation_enable_edge_connections(const bool p_value);
	bool get_debug_navigation_enable_edge_connections() const;

	void set_debug_navigation_enable_edge_connections_xray(const bool p_value);
	bool get_debug_navigation_enable_edge_connections_xray() const;

	void set_debug_navigation_enable_edge_lines(const bool p_value);
	bool get_debug_navigation_enable_edge_lines() const;

	void set_debug_navigation_enable_edge_lines_xray(const bool p_value);
	bool get_debug_navigation_enable_edge_lines_xray() const;

	void set_debug_navigation_enable_geometry_face_random_color(const bool p_value);
	bool get_debug_navigation_enable_geometry_face_random_color() const;

	void set_debug_navigation_enable_link_connections(const bool p_value);
	bool get_debug_navigation_enable_link_connections() const;

	void set_debug_navigation_enable_link_connections_xray(const bool p_value);
	bool get_debug_navigation_enable_link_connections_xray() const;

	void set_debug_navigation_enable_agent_paths(const bool p_value);
	bool get_debug_navigation_enable_agent_paths() const;

	void set_debug_navigation_enable_agent_paths_xray(const bool p_value);
	bool get_debug_navigation_enable_agent_paths_xray() const;

	void set_debug_navigation_agent_path_point_size(float p_point_size);
	float get_debug_navigation_agent_path_point_size() const;

	void set_debug_navigation_avoidance_enable_agents_radius(const bool p_value);
	bool get_debug_navigation_avoidance_enable_agents_radius() const;

	void set_debug_navigation_avoidance_enable_obstacles_radius(const bool p_value);
	bool get_debug_navigation_avoidance_enable_obstacles_radius() const;

	void set_debug_navigation_avoidance_enable_obstacles_static(const bool p_value);
	bool get_debug_navigation_avoidance_enable_obstacles_static() const;

	Ref<SpatialMaterial> get_debug_navigation_geometry_face_material();
	Ref<SpatialMaterial> get_debug_navigation_geometry_edge_material();
	Ref<SpatialMaterial> get_debug_navigation_geometry_face_disabled_material();
	Ref<SpatialMaterial> get_debug_navigation_geometry_edge_disabled_material();
	Ref<SpatialMaterial> get_debug_navigation_edge_connections_material();
	Ref<SpatialMaterial> get_debug_navigation_link_connections_material();
	Ref<SpatialMaterial> get_debug_navigation_link_connections_disabled_material();

	Ref<SpatialMaterial> get_debug_navigation_agent_path_line_material();
	Ref<SpatialMaterial> get_debug_navigation_agent_path_point_material();

	Ref<SpatialMaterial> get_debug_navigation_avoidance_agents_radius_material();
	Ref<SpatialMaterial> get_debug_navigation_avoidance_obstacles_radius_material();

	Ref<SpatialMaterial> get_debug_navigation_avoidance_static_obstacle_pushin_face_material();
	Ref<SpatialMaterial> get_debug_navigation_avoidance_static_obstacle_pushout_face_material();
	Ref<SpatialMaterial> get_debug_navigation_avoidance_static_obstacle_pushin_edge_material();
	Ref<SpatialMaterial> get_debug_navigation_avoidance_static_obstacle_pushout_edge_material();

protected:
	bool _debug_enabled;
	bool _debug_dirty;

	bool _debug_navigation_enabled;
	bool _navigation_debug_dirty;
	void _emit_navigation_debug_changed_signal();

	bool _debug_avoidance_enabled;
	bool _avoidance_debug_dirty;
	void _emit_avoidance_debug_changed_signal();

	Color _debug_navigation_edge_connection_color;
	Color _debug_navigation_geometry_edge_color;
	Color _debug_navigation_geometry_face_color;
	Color _debug_navigation_geometry_edge_disabled_color;
	Color _debug_navigation_geometry_face_disabled_color;
	Color _debug_navigation_link_connection_color;
	Color _debug_navigation_link_connection_disabled_color;
	Color _debug_navigation_agent_path_color;

	float _debug_navigation_agent_path_point_size;

	Color _debug_navigation_avoidance_agents_radius_color;
	Color _debug_navigation_avoidance_obstacles_radius_color;

	Color _debug_navigation_avoidance_static_obstacle_pushin_face_color;
	Color _debug_navigation_avoidance_static_obstacle_pushout_face_color;
	Color _debug_navigation_avoidance_static_obstacle_pushin_edge_color;
	Color _debug_navigation_avoidance_static_obstacle_pushout_edge_color;

	bool _debug_navigation_enable_edge_connections;
	bool _debug_navigation_enable_edge_connections_xray;
	bool _debug_navigation_enable_edge_lines;
	bool _debug_navigation_enable_edge_lines_xray;
	bool _debug_navigation_enable_geometry_face_random_color;
	bool _debug_navigation_enable_link_connections;
	bool _debug_navigation_enable_link_connections_xray;
	bool _debug_navigation_enable_agent_paths;
	bool _debug_navigation_enable_agent_paths_xray;

	bool _debug_navigation_avoidance_enable_agents_radius;
	bool _debug_navigation_avoidance_enable_obstacles_radius;
	bool _debug_navigation_avoidance_enable_obstacles_static;

	Ref<SpatialMaterial> _debug_navigation_geometry_edge_material;
	Ref<SpatialMaterial> _debug_navigation_geometry_face_material;
	Ref<SpatialMaterial> _debug_navigation_geometry_edge_disabled_material;
	Ref<SpatialMaterial> _debug_navigation_geometry_face_disabled_material;
	Ref<SpatialMaterial> _debug_navigation_edge_connections_material;
	Ref<SpatialMaterial> _debug_navigation_link_connections_material;
	Ref<SpatialMaterial> _debug_navigation_link_connections_disabled_material;
	Ref<SpatialMaterial> _debug_navigation_avoidance_agents_radius_material;
	Ref<SpatialMaterial> _debug_navigation_avoidance_obstacles_radius_material;

	Ref<SpatialMaterial> _debug_navigation_avoidance_static_obstacle_pushin_face_material;
	Ref<SpatialMaterial> _debug_navigation_avoidance_static_obstacle_pushout_face_material;
	Ref<SpatialMaterial> _debug_navigation_avoidance_static_obstacle_pushin_edge_material;
	Ref<SpatialMaterial> _debug_navigation_avoidance_static_obstacle_pushout_edge_material;

	Ref<SpatialMaterial> _debug_navigation_agent_path_line_material;
	Ref<SpatialMaterial> _debug_navigation_agent_path_point_material;

#endif // DEBUG_ENABLED
};

VARIANT_ENUM_CAST(NavigationServer::ProcessInfo);

typedef NavigationServer *(*CreateNavigationServerCallback)();

/// Manager used for the server singleton registration

class NavigationServerManager {
	struct ClassInfo {
		String name;
		CreateNavigationServerCallback create_callback;

		ClassInfo() :
				name(""),
				create_callback(nullptr) {}

		ClassInfo(String p_name, CreateNavigationServerCallback p_create_callback) :
				name(p_name),
				create_callback(p_create_callback) {}

		ClassInfo(const ClassInfo &p_ci) :
				name(p_ci.name),
				create_callback(p_ci.create_callback) {}

		ClassInfo operator=(const ClassInfo &p_ci) {
			name = p_ci.name;
			create_callback = p_ci.create_callback;
			return *this;
		}
	};

	static Vector<ClassInfo> navigation_servers;
	static int default_server_id;
	static int default_server_priority;

public:
	static const String setting_property_name;

private:
	static void on_servers_changed();

public:
	static void register_server(const String &p_name, CreateNavigationServerCallback p_create_callback);
	static void set_default_server(const String &p_name, int p_priority = 0);
	static int find_server_id(const String &p_name);
	static int get_servers_count();
	static String get_server_name(int p_id);
	static NavigationServer *new_default_server();
	static NavigationServer *new_server(const String &p_name);
};

#endif