/*************************************************************************/
/*  navigation_mesh.h                                                    */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef NAVIGATION_MESH_H
#define NAVIGATION_MESH_H

#include "scene/3d/spatial.h"
#include "scene/resources/mesh.h"

class Mesh;

class NavigationMesh : public Resource {

	GDCLASS(NavigationMesh, Resource);

	PoolVector<Vector3> vertices;
	struct Polygon {
		Vector<int> indices;
	};
	Vector<Polygon> polygons;
	Ref<ArrayMesh> debug_mesh;

	struct _EdgeKey {

		Vector3 from;
		Vector3 to;

		bool operator<(const _EdgeKey &p_with) const { return from == p_with.from ? to < p_with.to : from < p_with.from; }
	};

protected:
	static void _bind_methods();
	virtual void _validate_property(PropertyInfo &property) const;

	void _set_polygons(const Array &p_array);
	Array _get_polygons() const;

public:
	enum SamplePartitionType {
		SAMPLE_PARTITION_WATERSHED = 0,
		SAMPLE_PARTITION_MONOTONE,
		SAMPLE_PARTITION_LAYERS,
		SAMPLE_PARTITION_MAX
	};

	enum ParsedGeometryType {
		PARSED_GEOMETRY_MESH_INSTANCES = 0,
		PARSED_GEOMETRY_STATIC_COLLIDERS,
		PARSED_GEOMETRY_BOTH,
		PARSED_GEOMETRY_MAX
	};

	enum SourceGeometryMode {
		SOURCE_GEOMETRY_NAVMESH_CHILDREN = 0,
		SOURCE_GEOMETRY_GROUPS_WITH_CHILDREN,
		SOURCE_GEOMETRY_GROUPS_EXPLICIT,
		SOURCE_GEOMETRY_MAX
	};

protected:
	float cell_size;
	float cell_height;
	float agent_height;
	float agent_radius;
	float agent_max_climb;
	float agent_max_slope;
	float region_min_size;
	float region_merge_size;
	float edge_max_length;
	float edge_max_error;
	float verts_per_poly;
	float detail_sample_distance;
	float detail_sample_max_error;

	SamplePartitionType partition_type;
	ParsedGeometryType parsed_geometry_type;
	uint32_t collision_mask;

	SourceGeometryMode source_geometry_mode;
	StringName source_group_name;

	bool filter_low_hanging_obstacles;
	bool filter_ledge_spans;
	bool filter_walkable_low_height_spans;

public:
	// Recast settings
	void set_sample_partition_type(int p_value);
	int get_sample_partition_type() const;

	void set_parsed_geometry_type(int p_value);
	int get_parsed_geometry_type() const;

	void set_collision_mask(uint32_t p_mask);
	uint32_t get_collision_mask() const;

	void set_collision_mask_bit(int p_bit, bool p_value);
	bool get_collision_mask_bit(int p_bit) const;

	void set_source_geometry_mode(int p_geometry_mode);
	int get_source_geometry_mode() const;

	void set_source_group_name(StringName p_group_name);
	StringName get_source_group_name() const;

	void set_cell_size(float p_value);
	float get_cell_size() const;

	void set_cell_height(float p_value);
	float get_cell_height() const;

	void set_agent_height(float p_value);
	float get_agent_height() const;

	void set_agent_radius(float p_value);
	float get_agent_radius();

	void set_agent_max_climb(float p_value);
	float get_agent_max_climb() const;

	void set_agent_max_slope(float p_value);
	float get_agent_max_slope() const;

	void set_region_min_size(float p_value);
	float get_region_min_size() const;

	void set_region_merge_size(float p_value);
	float get_region_merge_size() const;

	void set_edge_max_length(float p_value);
	float get_edge_max_length() const;

	void set_edge_max_error(float p_value);
	float get_edge_max_error() const;

	void set_verts_per_poly(float p_value);
	float get_verts_per_poly() const;

	void set_detail_sample_distance(float p_value);
	float get_detail_sample_distance() const;

	void set_detail_sample_max_error(float p_value);
	float get_detail_sample_max_error() const;

	void set_filter_low_hanging_obstacles(bool p_value);
	bool get_filter_low_hanging_obstacles() const;

	void set_filter_ledge_spans(bool p_value);
	bool get_filter_ledge_spans() const;

	void set_filter_walkable_low_height_spans(bool p_value);
	bool get_filter_walkable_low_height_spans() const;

	void create_from_mesh(const Ref<Mesh> &p_mesh);

	void set_vertices(const PoolVector<Vector3> &p_vertices);
	PoolVector<Vector3> get_vertices() const;

	void add_polygon(const Vector<int> &p_polygon);
	int get_polygon_count() const;
	Vector<int> get_polygon(int p_idx);
	void clear_polygons();

	Ref<Mesh> get_debug_mesh();

	NavigationMesh();
};

class Navigation;

class NavigationMeshInstance : public Spatial {

	GDCLASS(NavigationMeshInstance, Spatial);

	bool enabled;
	int nav_id;
	Navigation *navigation;
	Ref<NavigationMesh> navmesh;

	Node *debug_view;

protected:
	void _notification(int p_what);
	static void _bind_methods();
	void _changed_callback(Object *p_changed, const char *p_prop);

public:
	void set_enabled(bool p_enabled);
	bool is_enabled() const;

	void set_navigation_mesh(const Ref<NavigationMesh> &p_navmesh);
	Ref<NavigationMesh> get_navigation_mesh() const;

	String get_configuration_warning() const;

	NavigationMeshInstance();
	~NavigationMeshInstance();
};

#endif // NAVIGATION_MESH_H
