#ifndef PROP_2D_MESHER_H
#define PROP_2D_MESHER_H
/*
Copyright (c) 2019-2022 Péter Magyar

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/math/color.h"
#include "core/containers/pool_vector.h"
#include "core/object/reference.h"
#include "core/containers/vector.h"
#include "scene/3d/mesh_instance.h"

#include "core/math/rect2.h"
#include "core/math/vector2.h"
#include "core/math/vector3.h"
#include "scene/main/node.h"
#include "scene/resources/material.h"
#include "scene/resources/mesh.h"

#include "modules/modules_enabled.gen.h"

#ifdef MODULE_MESH_DATA_RESOURCE_ENABLED
#include "../mesh_data_resource/mesh_data_resource.h"
#endif

#ifdef MODULE_TERRAMAN_2D_ENABLED
#include "../terraman_2d/data/terrain_2d_light.h"
#endif

class OpenSimplexNoise;
class Prop2DLight;
class Prop2DMaterialCache;
class TiledWall2DData;

class Prop2DMesher : public Reference {
	GDCLASS(Prop2DMesher, Reference);

public:
	static const String BINDING_STRING_BUILD_FLAGS;

	const double PI_2 = 3.141592653589793238463 / 2;
	const double PI = 3.141592653589793238463;

	enum BuildFlags {
		BUILD_FLAG_USE_LIGHTING = 1 << 0,
		BUILD_FLAG_USE_AO = 1 << 1,
		BUILD_FLAG_USE_RAO = 1 << 2,
		BUILD_FLAG_BAKE_LIGHTS = 1 << 3,
	};

	struct Vertex {
		Vector2 vertex;
		Color color;
		Vector2 uv;
		Vector<int> bones;
		Vector<float> weights;

		bool operator==(const Vertex &p_vertex) const;

		Vertex() {}
	};

	struct VertexHasher {
		static _FORCE_INLINE_ uint32_t hash(const Vertex &p_vtx);
	};

	struct WeightSort {
		int index;
		float weight;
		bool operator<(const WeightSort &p_right) const {
			return weight < p_right.weight;
		}
	};

public:
	int get_format() const;
	void set_format(const int value);

	int get_texture_scale() const;
	void set_texture_scale(const int value);

	Ref<Material> get_material();
	void set_material(const Ref<Material> &material);

	float get_pixels_per_unit() const;
	void set_pixels_per_unit(const float value);

	float get_ao_strength() const;
	void set_ao_strength(const float value);

	float get_base_light_value() const;
	void set_base_light_value(const float value);

	float get_voxel_scale() const;
	void set_voxel_scale(const float voxel_scale);

	Rect2 get_uv_margin() const;
	void set_uv_margin(const Rect2 margin);

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

	void reset();

	void add_tiled_wall_simple(const int width, const int height, const Transform2D &transform, const Ref<TiledWall2DData> &tiled_wall_data, Ref<Prop2DMaterialCache> cache);
	void add_tiled_wall_mesh_rect_simple(const int x, const int y, const Transform2D &transform, const Rect2 &texture_uv_rect, const Vector2 &size);
	Vector2 transform_uv(const Vector2 &uv, const Rect2 &rect) const;

#ifdef MODULE_MESH_DATA_RESOURCE_ENABLED
	void add_mesh_data_resource(Ref<MeshDataResource> mesh, const Vector3 position = Vector3(0, 0, 0), const Vector3 rotation = Vector3(0, 0, 0), const Vector3 scale = Vector3(1.0, 1.0, 1.0), const Rect2 uv_rect = Rect2(0, 0, 1, 1));
	void add_mesh_data_resource_transform(Ref<MeshDataResource> mesh, const Transform transform, const Rect2 uv_rect = Rect2(0, 0, 1, 1));
	void add_mesh_data_resource_transform_colored(Ref<MeshDataResource> mesh, const Transform transform, const PoolColorArray &colors, const Rect2 uv_rect = Rect2(0, 0, 1, 1));
#endif

	void generate_ao();
	float get_random_ao(const Vector2 &position);
	Color get_light_color_at(const Vector2 &position);

	void add_mesher(const Ref<Prop2DMesher> &mesher);
	void _add_mesher(const Ref<Prop2DMesher> &mesher);

	void add_light(const Ref<Prop2DLight> &light);
	void clear_lights();

	PoolVector<Vector2> build_collider() const;

	Rect2 calculate_rect();

	void bake_colors();
	void bake_colors_rao();
	void bake_colors_lights_rao();
	void bake_colors_lights();

#ifdef MODULE_TERRAMAN_2D_ENABLED
	void bake_lights(MeshInstance *node, Vector<Ref<Terrain2DLight>> &lights);
#endif

	Array build_mesh();
	void build_mesh_into(RID mesh);

	void remove_doubles();
	void remove_doubles_hashed();

	PoolVector<Vector2> get_vertices() const;
	void set_vertices(const PoolVector<Vector2> &values);
	int get_vertex_count() const;
	Vector2 get_vertex(const int idx) const;
	void remove_vertex(const int idx);
	void add_vertex(const Vector2 &vertex);

	PoolVector<Color> get_colors() const;
	void set_colors(const PoolVector<Color> &values);
	Color get_color(const int idx) const;
	void add_color(const Color &color);

	PoolVector<Vector2> get_uvs() const;
	void set_uvs(const PoolVector<Vector2> &values);
	Vector2 get_uv(const int idx) const;
	void add_uv(const Vector2 &vector);

	PoolVector<int> get_indices() const;
	void set_indices(const PoolVector<int> &values);
	int get_indices_count() const;
	int get_index(const int idx) const;
	void remove_index(const int idx);
	void add_indices(const int index);

	Prop2DMesher();
	~Prop2DMesher();

protected:
	static void _bind_methods();

	int _channel_index_type;
	int _channel_index_isolevel;

	int _format;

	int _texture_scale;

	PoolVector<Vertex> _vertices;
	PoolVector<int> _indices;
	Vector<Ref<Prop2DLight>> _lights;

	Color _last_color;
	Vector2 _last_uv;
	Vector<int> _last_bones;
	Vector<float> _last_weights;

	Ref<Material> _material;

	float _voxel_scale;

	float _ao_strength;
	float _base_light_value;
	Rect2 _uv_margin;
	int _build_flags;

	Ref<OpenSimplexNoise> _noise;
	float _rao_scale_factor;
	int _rao_seed;

	float _pixels_per_unit;
};

VARIANT_ENUM_CAST(Prop2DMesher::BuildFlags);

#endif