/*************************************************************************/
/*  grid_map.h                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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/*************************************************************************/
#ifndef GRID_MAP_H
#define GRID_MAP_H

#include "scene/3d/navigation.h"
#include "scene/3d/spatial.h"
#include "scene/resources/mesh_library.h"
#include "scene/resources/multimesh.h"

//heh heh, godotsphir!! this shares no code and the design is completely different with previous projects i've done..
//should scale better with hardware that supports instancing

class BakedLightInstance;

class GridMap : public Spatial {

	OBJ_TYPE(GridMap, Spatial);

	enum {
		MAP_DIRTY_TRANSFORMS = 1,
		MAP_DIRTY_INSTANCES = 2,
	};

	union IndexKey {

		struct {
			int16_t x;
			int16_t y;
			int16_t z;
		};
		uint64_t key;

		_FORCE_INLINE_ bool operator<(const IndexKey &p_key) const {

			return key < p_key.key;
		}

		IndexKey() { key = 0; }
	};

	/**
	 * @brief A Cell is a single cell in the cube map space; it is defined by its coordinates and the populating Item, identified by int id.
	 */
	union Cell {

		struct {
			unsigned int item : 16;
			unsigned int rot : 5;
			unsigned int layer : 8;
		};
		uint32_t cell;

		Cell() {
			item = 0;
			rot = 0;
			layer = 0;
		}
	};

	/**
	 * @brief An Octant is a prism containing Cells, and possibly belonging to an Area.
	 * A GridMap can have multiple Octants.
	 */
	struct Octant {

		struct NavMesh {
			int id;
			Transform xform;
		};

		struct ItemInstances {
			Set<IndexKey> cells;
			Ref<Mesh> mesh;
			Ref<Shape> shape;
			Ref<MultiMesh> multimesh;
			RID multimesh_instance;
			Ref<NavigationMesh> navmesh;
		};

		Ref<Mesh> baked;
		RID bake_instance;
		RID collision_debug;
		RID collision_debug_instance;

		bool dirty;
		RID static_body;
		Map<int, ItemInstances> items;
		Map<IndexKey, NavMesh> navmesh_ids;
	};

	union OctantKey {

		struct {
			int16_t x;
			int16_t y;
			int16_t z;
			int16_t area;
		};

		uint64_t key;

		_FORCE_INLINE_ bool operator<(const OctantKey &p_key) const {

			return key < p_key.key;
		}

		//OctantKey(const IndexKey& p_k, int p_item) { indexkey=p_k.key; item=p_item; }
		OctantKey() { key = 0; }
	};

	Transform last_transform;

	bool _in_tree;
	float cell_size;
	int octant_size;
	bool center_x, center_y, center_z;
	bool bake;
	float cell_scale;
	Navigation *navigation;

	bool clip;
	bool clip_above;
	int clip_floor;
	bool baked_lock;
	Vector3::Axis clip_axis;

	/**
	 * @brief An Area is something like a room: it has doors, and Octants can choose to belong to it.
	 */
	struct Area {

		String name;
		RID base_portal;
		RID instance;
		IndexKey from;
		IndexKey to;
		struct Portal {
			Transform xform;
			RID instance;
			~Portal();
		};
		Vector<Portal> portals;
		float portal_disable_distance;
		Color portal_disable_color;
		bool exterior_portal;

		Area();
		~Area();
	};

	Ref<MeshLibrary> theme;

	Map<OctantKey, Octant *> octant_map;
	Map<IndexKey, Cell> cell_map;
	Map<int, Area *> area_map;

	void _recreate_octant_data();

	struct BakeLight {

		VS::LightType type;
		Vector3 pos;
		Vector3 dir;
		float param[VS::LIGHT_PARAM_MAX];
	};

	_FORCE_INLINE_ int _find_area(const IndexKey &p_pos) const;

	_FORCE_INLINE_ Vector3 _octant_get_offset(const OctantKey &p_key) const {

		return Vector3(p_key.x, p_key.y, p_key.z) * cell_size * octant_size;
	}

	void _octant_enter_world(const OctantKey &p_key);
	void _octant_enter_tree(const OctantKey &p_key);
	void _octant_exit_world(const OctantKey &p_key);
	void _octant_update(const OctantKey &p_key);
	void _octant_transform(const OctantKey &p_key);
	void _octant_clear_baked(const OctantKey &p_key);
	void _octant_clear_navmesh(const GridMap::OctantKey &);
	void _octant_bake(const OctantKey &p_key, const Ref<TriangleMesh> &p_tmesh = RES(), const Vector<BakeLight> &p_lights = Vector<BakeLight>(), List<Vector3> *r_prebake = NULL);
	bool awaiting_update;

	void _queue_dirty_map();
	void _update_dirty_map_callback();

	void resource_changed(const RES &p_res);

	void _update_areas();
	void _update_area_instances();

	void _clear_internal(bool p_keep_areas = false);

	BakedLightInstance *baked_light_instance;
	bool use_baked_light;
	void _find_baked_light();
	void _baked_light_changed();

	Array _get_baked_light_meshes();

protected:
	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;

	void _notification(int p_what);
	static void _bind_methods();

public:
	enum {
		INVALID_CELL_ITEM = -1
	};

	void set_theme(const Ref<MeshLibrary> &p_theme);
	Ref<MeshLibrary> get_theme() const;

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

	void set_octant_size(int p_size);
	int get_octant_size() const;

	void set_center_x(bool p_enable);
	bool get_center_x() const;
	void set_center_y(bool p_enable);
	bool get_center_y() const;
	void set_center_z(bool p_enable);
	bool get_center_z() const;

	void set_cell_item(int p_x, int p_y, int p_z, int p_item, int p_orientation = 0);
	int get_cell_item(int p_x, int p_y, int p_z) const;
	int get_cell_item_orientation(int p_x, int p_y, int p_z) const;

	void set_clip(bool p_enabled, bool p_clip_above = true, int p_floor = 0, Vector3::Axis p_axis = Vector3::AXIS_X);

	Error create_area(int p_id, const AABB &p_area);
	AABB area_get_bounds(int p_area) const;
	void area_set_exterior_portal(int p_area, bool p_enable);
	void area_set_name(int p_area, const String &p_name);
	String area_get_name(int p_area) const;
	bool area_is_exterior_portal(int p_area) const;
	void area_set_portal_disable_distance(int p_area, float p_distance);
	float area_get_portal_disable_distance(int p_area) const;
	void area_set_portal_disable_color(int p_area, Color p_color);
	Color area_get_portal_disable_color(int p_area) const;
	void get_area_list(List<int> *p_areas) const;
	void erase_area(int p_area);
	int get_unused_area_id() const;

	void set_cell_scale(float p_scale);
	float get_cell_scale() const;

	void set_bake(bool p_bake);
	bool is_baking_enabled() const;

	void bake_geometry();

	void set_use_baked_light(bool p_use);
	bool is_using_baked_light() const;
	void clear();

	GridMap();
	~GridMap();
};

#endif // CUBE_GRID_MAP_H