/**************************************************************************/
/*  nav_mesh_generator_2d.h                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* a copy of this software and associated documentation files (the        */
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/**************************************************************************/

#ifndef NAV_MESH_GENERATOR_2D_H
#define NAV_MESH_GENERATOR_2D_H

#ifdef CLIPPER2_ENABLED

#include "core/object/class_db.h"
#include "core/object/worker_thread_pool.h"
#include "core/templates/rid_owner.h"

class Node;
class NavigationPolygon;
class NavigationMeshSourceGeometryData2D;

class NavMeshGenerator2D : public Object {
	static NavMeshGenerator2D *singleton;

	static Mutex baking_navmesh_mutex;
	static Mutex generator_task_mutex;

	static RWLock generator_rid_rwlock;
	struct NavMeshGeometryParser2D {
		RID self;
		Callable callback;
	};
	static RID_Owner<NavMeshGeometryParser2D> generator_parser_owner;
	static LocalVector<NavMeshGeometryParser2D *> generator_parsers;

	static bool use_threads;
	static bool baking_use_multiple_threads;
	static bool baking_use_high_priority_threads;

	struct NavMeshGeneratorTask2D {
		enum TaskStatus {
			BAKING_STARTED,
			BAKING_FINISHED,
			BAKING_FAILED,
			CALLBACK_DISPATCHED,
			CALLBACK_FAILED,
		};

		Ref<NavigationPolygon> navigation_mesh;
		Ref<NavigationMeshSourceGeometryData2D> source_geometry_data;
		Callable callback;
		WorkerThreadPool::TaskID thread_task_id = WorkerThreadPool::INVALID_TASK_ID;
		NavMeshGeneratorTask2D::TaskStatus status = NavMeshGeneratorTask2D::TaskStatus::BAKING_STARTED;
	};

	static HashMap<WorkerThreadPool::TaskID, NavMeshGeneratorTask2D *> generator_tasks;

	static void generator_thread_bake(void *p_arg);

	static HashSet<Ref<NavigationPolygon>> baking_navmeshes;

	static void generator_parse_geometry_node(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node, bool p_recurse_children);
	static void generator_parse_source_geometry_data(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_root_node);
	static void generator_bake_from_source_geometry_data(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data);

	static void generator_parse_meshinstance2d_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);
	static void generator_parse_multimeshinstance2d_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);
	static void generator_parse_polygon2d_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);
	static void generator_parse_staticbody2d_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);
	static void generator_parse_tile_map_layer_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);
	static void generator_parse_navigationobstacle_node(const Ref<NavigationPolygon> &p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_node);

	static bool generator_emit_callback(const Callable &p_callback);

public:
	static NavMeshGenerator2D *get_singleton();

	static void sync();
	static void cleanup();
	static void finish();

	static void parse_source_geometry_data(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, Node *p_root_node, const Callable &p_callback = Callable());
	static void bake_from_source_geometry_data(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, const Callable &p_callback = Callable());
	static void bake_from_source_geometry_data_async(Ref<NavigationPolygon> p_navigation_mesh, Ref<NavigationMeshSourceGeometryData2D> p_source_geometry_data, const Callable &p_callback = Callable());
	static bool is_baking(Ref<NavigationPolygon> p_navigation_polygon);

	static RID source_geometry_parser_create();
	static void source_geometry_parser_set_callback(RID p_parser, const Callable &p_callback);

	static bool owns(RID p_object);
	static void free(RID p_object);

	NavMeshGenerator2D();
	~NavMeshGenerator2D();
};

#endif // CLIPPER2_ENABLED

#endif // NAV_MESH_GENERATOR_2D_H