#ifndef VOXEL_CHUNK_DEFAULT_H
#define VOXEL_CHUNK_DEFAULT_H

/*************************************************************************/
/*  voxel_chunk_default.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/config/engine.h"
#include "core/string/ustring.h"
#include "core/variant/array.h"

#include "../voxel_chunk.h"

#include "../../defines.h"

#include "core/os/mutex.h"
#include "core/os/thread.h"
#include "core/os/thread_safe.h"

#include "../../data/voxel_light.h"
#include "../../library/voxel_library.h"
#include "../../library/voxel_surface.h"
#include "../../meshers/voxel_mesher.h"
#include "../voxel_world.h"
#include "scene/resources/packed_scene.h"

class VoxelWorld;
class VoxelJob;

class VoxelChunkDefault : public VoxelChunk {
	GDCLASS(VoxelChunkDefault, VoxelChunk);

	_THREAD_SAFE_CLASS_

public:
	static const String BINDING_STRING_BUILD_FLAGS;

	enum DefaultChannels {
		DEFAULT_CHANNEL_TYPE = 0,
		DEFAULT_CHANNEL_ISOLEVEL,
		DEFAULT_CHANNEL_ALT_TYPE,
		DEFAULT_CHANNEL_ALT_ISOLEVEL,
		DEFAULT_CHANNEL_LIGHT_COLOR_R,
		DEFAULT_CHANNEL_LIGHT_COLOR_G,
		DEFAULT_CHANNEL_LIGHT_COLOR_B,
		DEFAULT_CHANNEL_AO,
		DEFAULT_CHANNEL_RANDOM_AO,
		DEFAULT_CHANNEL_LIQUID_FLOW,
		MAX_DEFAULT_CHANNELS
	};

	enum {
		MESH_INDEX_TERRAIN = 0,
		MESH_INDEX_PROP,
		MESH_INDEX_LIQUID,
		MESH_INDEX_CLUTTER,
	};

	enum {
		MESH_TYPE_INDEX_MESH = 0,
		MESH_TYPE_INDEX_MESH_INSTANCE,
		MESH_TYPE_INDEX_SHAPE,
		MESH_TYPE_INDEX_BODY,
		MESH_TYPE_INDEX_AREA,
	};

	enum BuildFlags {
		BUILD_FLAG_USE_ISOLEVEL = 1 << 0,
		BUILD_FLAG_USE_LIGHTING = 1 << 1,
		BUILD_FLAG_USE_AO = 1 << 2,
		BUILD_FLAG_USE_RAO = 1 << 3,
		BUILD_FLAG_GENERATE_AO = 1 << 4,
		BUILD_FLAG_AUTO_GENERATE_RAO = 1 << 5,
		BUILD_FLAG_BAKE_LIGHTS = 1 << 6,
		BUILD_FLAG_CREATE_COLLIDER = 1 << 7,
		BUILD_FLAG_CREATE_LODS = 1 << 8,
	};

public:
	int get_build_flags() const;
	void set_build_flags(const int flags);

	//add dirty flags
	bool get_lights_dirty() const;
	void set_lights_dirty(const bool value);

	//Lod
	int get_lod_num() const;
	void set_lod_num(const int value);

	int get_current_lod_level() const;
	void set_current_lod_level(const int value);

	//Meshes
	Dictionary mesh_rids_get();
	void mesh_rids_set(const Dictionary &rids);

	RID mesh_rid_get(const int mesh_index, const int mesh_type_index);
	void mesh_rid_set(const int mesh_index, const int mesh_type_index, RID value);
	RID mesh_rid_get_index(const int mesh_index, const int mesh_type_index, const int index);
	void mesh_rid_set_index(const int mesh_index, const int mesh_type_index, const int index, RID value);
	int mesh_rid_get_count(const int mesh_index, const int mesh_type_index);
	void mesh_rids_clear(const int mesh_index, const int mesh_type_index);

	Array meshes_get(const int mesh_index, const int mesh_type_index);
	void meshes_set(const int mesh_index, const int mesh_type_index, const Array &meshes);
	bool meshes_has(const int mesh_index, const int mesh_type_index);

	void rids_clear();

	void rids_free();

	void meshes_create(const int mesh_index, const int mesh_count);
	void meshes_free(const int mesh_index);

	void colliders_create(const int mesh_index, const int layer_mask = 1);
	void colliders_create_area(const int mesh_index, const int layer_mask = 1);
	void colliders_free(const int mesh_index);

	void free_index(const int mesh_index);

	//Transform
	void update_transforms();

	//Lights
	Ref<VoxelLight> get_light(const int index);
	int get_light_count() const;

	//Debug
	void debug_mesh_allocate();
	void debug_mesh_free();
	bool debug_mesh_has();
	void debug_mesh_clear();
	void debug_mesh_array_clear();
	void debug_mesh_add_vertices_to(const PoolVector3Array &arr);
	void debug_mesh_send();

	void draw_cross_voxels(Vector3 pos);
	void draw_cross_voxels_fill(Vector3 pos, float fill);
	void draw_debug_voxels(int max, Color color = Color(1, 1, 1));
	void draw_debug_voxel_lights();
	void draw_debug_mdr_colliders();

	//Visibility
	void visibility_changed(bool visible);

	//free
	void free_chunk();

	//etc
	void emit_build_finished();

	void generate_random_ao(const int seed, const int octaves = 4, const int period = 30, const float persistence = 0.3, const float scale_factor = 0.6);

	bool get_build_step_in_progress() const;
	void set_build_step_in_progress(const bool value);

	void _finalize_build();

	VoxelChunkDefault();
	~VoxelChunkDefault();

protected:
	virtual void _channel_setup();

	virtual void _visibility_changed(bool visible);

	virtual void _exit_tree();
	virtual void _world_transform_changed();

	//lights
	virtual void _bake_lights();
	virtual void _bake_light(Ref<VoxelLight> light);
	virtual void _clear_baked_lights();
	virtual void _world_light_added(const Ref<VoxelLight> &light);
	virtual void _world_light_removed(const Ref<VoxelLight> &light);

	static void _bind_methods();

	int _build_flags;

	bool _enabled;

	bool _lights_dirty;

	//lod
	int _lod_num;
	int _current_lod_level;

	//Meshes
	Dictionary _rids;

	//debug
	RID _debug_mesh_rid;
	RID _debug_mesh_instance;
	PoolVector3Array _debug_mesh_array;

	Vector<Ref<VoxelLight>> _lights;
};

VARIANT_ENUM_CAST(VoxelChunkDefault::DefaultChannels);
VARIANT_ENUM_CAST(VoxelChunkDefault::BuildFlags);

#endif