/*************************************************************************/
/*  resource_importer_scene.h                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/*************************************************************************/

#ifndef RESOURCEIMPORTERSCENE_H
#define RESOURCEIMPORTERSCENE_H

#include "core/io/resource_importer.h"
#include "scene/3d/node_3d.h"
#include "scene/resources/animation.h"
#include "scene/resources/mesh.h"
#include "scene/resources/shape_3d.h"
#include "scene/resources/skin.h"

class Material;
class AnimationPlayer;

class ImporterMesh;
class EditorSceneFormatImporter : public RefCounted {
	GDCLASS(EditorSceneFormatImporter, RefCounted);

protected:
	static void _bind_methods();

	Node *import_scene_from_other_importer(const String &p_path, uint32_t p_flags, int p_bake_fps);
	Ref<Animation> import_animation_from_other_importer(const String &p_path, uint32_t p_flags, int p_bake_fps);

	GDVIRTUAL0RC(int, _get_import_flags)
	GDVIRTUAL0RC(Vector<String>, _get_extensions)
	GDVIRTUAL3R(Object *, _import_scene, String, uint32_t, uint32_t)
	GDVIRTUAL3R(Ref<Animation>, _import_animation, String, uint32_t, uint32_t)
	GDVIRTUAL1(_get_import_options, String)
	GDVIRTUAL2RC(Variant, _get_option_visibility, String, String)

public:
	enum ImportFlags {
		IMPORT_SCENE = 1,
		IMPORT_ANIMATION = 2,
		IMPORT_FAIL_ON_MISSING_DEPENDENCIES = 4,
		IMPORT_GENERATE_TANGENT_ARRAYS = 8,
		IMPORT_USE_NAMED_SKIN_BINDS = 16,
	};

	virtual uint32_t get_import_flags() const;
	virtual void get_extensions(List<String> *r_extensions) const;
	virtual Node *import_scene(const String &p_path, uint32_t p_flags, int p_bake_fps, List<String> *r_missing_deps, Error *r_err = nullptr);
	virtual Ref<Animation> import_animation(const String &p_path, uint32_t p_flags, int p_bake_fps);
	virtual void get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options);
	virtual Variant get_option_visibility(const String &p_path, const String &p_option, const Map<StringName, Variant> &p_options);

	EditorSceneFormatImporter() {}
};

class EditorScenePostImport : public RefCounted {
	GDCLASS(EditorScenePostImport, RefCounted);

	String source_file;

protected:
	static void _bind_methods();

	GDVIRTUAL1R(Object *, _post_import, Node *)

public:
	String get_source_file() const;
	virtual Node *post_import(Node *p_scene);
	virtual void init(const String &p_source_file);
	EditorScenePostImport();
};

class EditorScenePostImportPlugin : public RefCounted {
	GDCLASS(EditorScenePostImportPlugin, RefCounted);

public:
	enum InternalImportCategory {
		INTERNAL_IMPORT_CATEGORY_NODE,
		INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE,
		INTERNAL_IMPORT_CATEGORY_MESH,
		INTERNAL_IMPORT_CATEGORY_MATERIAL,
		INTERNAL_IMPORT_CATEGORY_ANIMATION,
		INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE,
		INTERNAL_IMPORT_CATEGORY_MAX
	};

private:
	mutable const Map<StringName, Variant> *current_options = nullptr;
	mutable const Dictionary *current_options_dict = nullptr;
	List<ResourceImporter::ImportOption> *current_option_list = nullptr;
	InternalImportCategory current_category = INTERNAL_IMPORT_CATEGORY_MAX;

protected:
	GDVIRTUAL1(_get_internal_import_options, int)
	GDVIRTUAL2RC(Variant, _get_internal_option_visibility, int, String)
	GDVIRTUAL2RC(Variant, _get_internal_option_update_view_required, int, String)
	GDVIRTUAL4(_internal_process, int, Node *, Node *, RES)
	GDVIRTUAL1(_get_import_options, String)
	GDVIRTUAL2RC(Variant, _get_option_visibility, String, String)
	GDVIRTUAL1(_pre_process, Node *)
	GDVIRTUAL1(_post_process, Node *)

	static void _bind_methods();

public:
	Variant get_option_value(const StringName &p_name) const;
	void add_import_option(const String &p_name, Variant p_default_value);
	void add_import_option_advanced(Variant::Type p_type, const String &p_name, Variant p_default_value, PropertyHint p_hint = PROPERTY_HINT_NONE, const String &p_hint_string = String(), int p_usage_flags = PROPERTY_USAGE_DEFAULT);

	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options);
	virtual Variant get_internal_option_visibility(InternalImportCategory p_category, const String &p_option, const Map<StringName, Variant> &p_options) const;
	virtual Variant get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const Map<StringName, Variant> &p_options) const;

	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, RES p_resource, const Dictionary &p_options);

	virtual void get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options);
	virtual Variant get_option_visibility(const String &p_path, const String &p_option, const Map<StringName, Variant> &p_options) const;

	virtual void pre_process(Node *p_scene, const Map<StringName, Variant> &p_options);
	virtual void post_process(Node *p_scene, const Map<StringName, Variant> &p_options);

	EditorScenePostImportPlugin() {}
};

VARIANT_ENUM_CAST(EditorScenePostImportPlugin::InternalImportCategory)

class ResourceImporterScene : public ResourceImporter {
	GDCLASS(ResourceImporterScene, ResourceImporter);

	Set<Ref<EditorSceneFormatImporter>> importers;

	static ResourceImporterScene *singleton;

	enum LightBakeMode {
		LIGHT_BAKE_DISABLED,
		LIGHT_BAKE_DYNAMIC,
		LIGHT_BAKE_STATIC,
		LIGHT_BAKE_STATIC_LIGHTMAPS
	};

	enum MeshPhysicsMode {
		MESH_PHYSICS_DISABLED,
		MESH_PHYSICS_MESH_AND_STATIC_COLLIDER,
		MESH_PHYSICS_RIGID_BODY_AND_MESH,
		MESH_PHYSICS_STATIC_COLLIDER_ONLY,
		MESH_PHYSICS_AREA_ONLY,
	};

	enum NavMeshMode {
		NAVMESH_DISABLED,
		NAVMESH_MESH_AND_NAVMESH,
		NAVMESH_NAVMESH_ONLY,
	};

	enum MeshOverride {
		MESH_OVERRIDE_DEFAULT,
		MESH_OVERRIDE_ENABLE,
		MESH_OVERRIDE_DISABLE,
	};

	enum BodyType {
		BODY_TYPE_STATIC,
		BODY_TYPE_DYNAMIC,
		BODY_TYPE_AREA
	};

	enum ShapeType {
		SHAPE_TYPE_DECOMPOSE_CONVEX,
		SHAPE_TYPE_SIMPLE_CONVEX,
		SHAPE_TYPE_TRIMESH,
		SHAPE_TYPE_BOX,
		SHAPE_TYPE_SPHERE,
		SHAPE_TYPE_CYLINDER,
		SHAPE_TYPE_CAPSULE,
	};

	void _replace_owner(Node *p_node, Node *p_scene, Node *p_new_owner);
	void _generate_meshes(Node *p_node, const Dictionary &p_mesh_data, bool p_generate_lods, bool p_create_shadow_meshes, LightBakeMode p_light_bake_mode, float p_lightmap_texel_size, const Vector<uint8_t> &p_src_lightmap_cache, Vector<Vector<uint8_t>> &r_lightmap_caches);
	void _add_shapes(Node *p_node, const Vector<Ref<Shape3D>> &p_shapes);

	enum AnimationImportTracks {
		ANIMATION_IMPORT_TRACKS_IF_PRESENT,
		ANIMATION_IMPORT_TRACKS_IF_PRESENT_FOR_ALL,
		ANIMATION_IMPORT_TRACKS_NEVER,
	};
	enum TrackChannel {
		TRACK_CHANNEL_POSITION,
		TRACK_CHANNEL_ROTATION,
		TRACK_CHANNEL_SCALE,
		TRACK_CHANNEL_BLEND_SHAPE,
		TRACK_CHANNEL_MAX
	};

	void _optimize_track_usage(AnimationPlayer *p_player, AnimationImportTracks *p_track_actions);

	mutable Vector<Ref<EditorScenePostImportPlugin>> post_importer_plugins;

public:
	static ResourceImporterScene *get_singleton() { return singleton; }

	void add_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin) { post_importer_plugins.push_back(p_plugin); }
	void remove_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin) { post_importer_plugins.erase(p_plugin); }

	const Set<Ref<EditorSceneFormatImporter>> &get_importers() const { return importers; }

	void add_importer(Ref<EditorSceneFormatImporter> p_importer) { importers.insert(p_importer); }
	void remove_importer(Ref<EditorSceneFormatImporter> p_importer) { importers.erase(p_importer); }

	virtual String get_importer_name() const override;
	virtual String get_visible_name() const override;
	virtual void get_recognized_extensions(List<String> *p_extensions) const override;
	virtual String get_save_extension() const override;
	virtual String get_resource_type() const override;
	virtual int get_format_version() const override;

	virtual int get_preset_count() const override;
	virtual String get_preset_name(int p_idx) const override;

	enum InternalImportCategory {
		INTERNAL_IMPORT_CATEGORY_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_NODE,
		INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE,
		INTERNAL_IMPORT_CATEGORY_MESH = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH,
		INTERNAL_IMPORT_CATEGORY_MATERIAL = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MATERIAL,
		INTERNAL_IMPORT_CATEGORY_ANIMATION = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION,
		INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE,
		INTERNAL_IMPORT_CATEGORY_MAX = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MAX
	};

	void get_internal_import_options(InternalImportCategory p_category, List<ImportOption> *r_options) const;
	bool get_internal_option_visibility(InternalImportCategory p_category, const String &p_option, const Map<StringName, Variant> &p_options) const;
	bool get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const Map<StringName, Variant> &p_options) const;

	virtual void get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset = 0) const override;
	virtual bool get_option_visibility(const String &p_path, const String &p_option, const Map<StringName, Variant> &p_options) const override;
	// Import scenes *after* everything else (such as textures).
	virtual int get_import_order() const override { return ResourceImporter::IMPORT_ORDER_SCENE; }

	Node *_pre_fix_node(Node *p_node, Node *p_root, Map<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &collision_map);
	Node *_post_fix_node(Node *p_node, Node *p_root, Map<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &collision_map, Set<Ref<ImporterMesh>> &r_scanned_meshes, const Dictionary &p_node_data, const Dictionary &p_material_data, const Dictionary &p_animation_data, float p_animation_fps);

	Ref<Animation> _save_animation_to_file(Ref<Animation> anim, bool p_save_to_file, String p_save_to_path, bool p_keep_custom_tracks);
	void _create_clips(AnimationPlayer *anim, const Array &p_clips, bool p_bake_all);
	void _optimize_animations(AnimationPlayer *anim, float p_max_lin_error, float p_max_ang_error, float p_max_angle);
	void _compress_animations(AnimationPlayer *anim, int p_page_size_kb);

	Node *pre_import(const String &p_source_file);
	virtual Error import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = nullptr, Variant *r_metadata = nullptr) override;

	Node *import_scene_from_other_importer(EditorSceneFormatImporter *p_exception, const String &p_path, uint32_t p_flags, int p_bake_fps);
	Ref<Animation> import_animation_from_other_importer(EditorSceneFormatImporter *p_exception, const String &p_path, uint32_t p_flags, int p_bake_fps);

	virtual bool has_advanced_options() const override;
	virtual void show_advanced_options(const String &p_path) override;

	virtual bool can_import_threaded() const override { return false; }

	ResourceImporterScene();

	template <class M>
	static Vector<Ref<Shape3D>> get_collision_shapes(const Ref<Mesh> &p_mesh, const M &p_options);

	template <class M>
	static Transform3D get_collision_shapes_transform(const M &p_options);
};

class EditorSceneFormatImporterESCN : public EditorSceneFormatImporter {
	GDCLASS(EditorSceneFormatImporterESCN, EditorSceneFormatImporter);

public:
	virtual uint32_t get_import_flags() const override;
	virtual void get_extensions(List<String> *r_extensions) const override;
	virtual Node *import_scene(const String &p_path, uint32_t p_flags, int p_bake_fps, List<String> *r_missing_deps, Error *r_err = nullptr) override;
	virtual Ref<Animation> import_animation(const String &p_path, uint32_t p_flags, int p_bake_fps) override;
};

#include "scene/resources/box_shape_3d.h"
#include "scene/resources/capsule_shape_3d.h"
#include "scene/resources/cylinder_shape_3d.h"
#include "scene/resources/sphere_shape_3d.h"

template <class M>
Vector<Ref<Shape3D>> ResourceImporterScene::get_collision_shapes(const Ref<Mesh> &p_mesh, const M &p_options) {
	ShapeType generate_shape_type = SHAPE_TYPE_DECOMPOSE_CONVEX;
	if (p_options.has(SNAME("physics/shape_type"))) {
		generate_shape_type = (ShapeType)p_options[SNAME("physics/shape_type")].operator int();
	}

	if (generate_shape_type == SHAPE_TYPE_DECOMPOSE_CONVEX) {
		Mesh::ConvexDecompositionSettings decomposition_settings;
		bool advanced = false;
		if (p_options.has(SNAME("decomposition/advanced"))) {
			advanced = p_options[SNAME("decomposition/advanced")];
		}

		if (advanced) {
			if (p_options.has(SNAME("decomposition/max_concavity"))) {
				decomposition_settings.max_concavity = p_options[SNAME("decomposition/max_concavity")];
			}

			if (p_options.has(SNAME("decomposition/symmetry_planes_clipping_bias"))) {
				decomposition_settings.symmetry_planes_clipping_bias = p_options[SNAME("decomposition/symmetry_planes_clipping_bias")];
			}

			if (p_options.has(SNAME("decomposition/revolution_axes_clipping_bias"))) {
				decomposition_settings.revolution_axes_clipping_bias = p_options[SNAME("decomposition/revolution_axes_clipping_bias")];
			}

			if (p_options.has(SNAME("decomposition/min_volume_per_convex_hull"))) {
				decomposition_settings.min_volume_per_convex_hull = p_options[SNAME("decomposition/min_volume_per_convex_hull")];
			}

			if (p_options.has(SNAME("decomposition/resolution"))) {
				decomposition_settings.resolution = p_options[SNAME("decomposition/resolution")];
			}

			if (p_options.has(SNAME("decomposition/max_num_vertices_per_convex_hull"))) {
				decomposition_settings.max_num_vertices_per_convex_hull = p_options[SNAME("decomposition/max_num_vertices_per_convex_hull")];
			}

			if (p_options.has(SNAME("decomposition/plane_downsampling"))) {
				decomposition_settings.plane_downsampling = p_options[SNAME("decomposition/plane_downsampling")];
			}

			if (p_options.has(SNAME("decomposition/convexhull_downsampling"))) {
				decomposition_settings.convexhull_downsampling = p_options[SNAME("decomposition/convexhull_downsampling")];
			}

			if (p_options.has(SNAME("decomposition/normalize_mesh"))) {
				decomposition_settings.normalize_mesh = p_options[SNAME("decomposition/normalize_mesh")];
			}

			if (p_options.has(SNAME("decomposition/mode"))) {
				decomposition_settings.mode = (Mesh::ConvexDecompositionSettings::Mode)p_options[SNAME("decomposition/mode")].operator int();
			}

			if (p_options.has(SNAME("decomposition/convexhull_approximation"))) {
				decomposition_settings.convexhull_approximation = p_options[SNAME("decomposition/convexhull_approximation")];
			}

			if (p_options.has(SNAME("decomposition/max_convex_hulls"))) {
				decomposition_settings.max_convex_hulls = p_options[SNAME("decomposition/max_convex_hulls")];
			}

			if (p_options.has(SNAME("decomposition/project_hull_vertices"))) {
				decomposition_settings.project_hull_vertices = p_options[SNAME("decomposition/project_hull_vertices")];
			}
		} else {
			int precision_level = 5;
			if (p_options.has(SNAME("decomposition/precision"))) {
				precision_level = p_options[SNAME("decomposition/precision")];
			}

			const real_t precision = real_t(precision_level - 1) / 9.0;

			decomposition_settings.max_concavity = Math::lerp(real_t(1.0), real_t(0.001), precision);
			decomposition_settings.min_volume_per_convex_hull = Math::lerp(real_t(0.01), real_t(0.0001), precision);
			decomposition_settings.resolution = Math::lerp(10'000, 100'000, precision);
			decomposition_settings.max_num_vertices_per_convex_hull = Math::lerp(32, 64, precision);
			decomposition_settings.plane_downsampling = Math::lerp(3, 16, precision);
			decomposition_settings.convexhull_downsampling = Math::lerp(3, 16, precision);
			decomposition_settings.max_convex_hulls = Math::lerp(1, 32, precision);
		}

		return p_mesh->convex_decompose(decomposition_settings);
	} else if (generate_shape_type == SHAPE_TYPE_SIMPLE_CONVEX) {
		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(p_mesh->create_convex_shape(true, /*Passing false, otherwise VHACD will be used to simplify (Decompose) the Mesh.*/ false));
		return shapes;
	} else if (generate_shape_type == SHAPE_TYPE_TRIMESH) {
		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(p_mesh->create_trimesh_shape());
		return shapes;
	} else if (generate_shape_type == SHAPE_TYPE_BOX) {
		Ref<BoxShape3D> box;
		box.instantiate();
		if (p_options.has(SNAME("primitive/size"))) {
			box->set_size(p_options[SNAME("primitive/size")]);
		}

		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(box);
		return shapes;

	} else if (generate_shape_type == SHAPE_TYPE_SPHERE) {
		Ref<SphereShape3D> sphere;
		sphere.instantiate();
		if (p_options.has(SNAME("primitive/radius"))) {
			sphere->set_radius(p_options[SNAME("primitive/radius")]);
		}

		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(sphere);
		return shapes;
	} else if (generate_shape_type == SHAPE_TYPE_CYLINDER) {
		Ref<CylinderShape3D> cylinder;
		cylinder.instantiate();
		if (p_options.has(SNAME("primitive/height"))) {
			cylinder->set_height(p_options[SNAME("primitive/height")]);
		}
		if (p_options.has(SNAME("primitive/radius"))) {
			cylinder->set_radius(p_options[SNAME("primitive/radius")]);
		}

		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(cylinder);
		return shapes;
	} else if (generate_shape_type == SHAPE_TYPE_CAPSULE) {
		Ref<CapsuleShape3D> capsule;
		capsule.instantiate();
		if (p_options.has(SNAME("primitive/height"))) {
			capsule->set_height(p_options[SNAME("primitive/height")]);
		}
		if (p_options.has(SNAME("primitive/radius"))) {
			capsule->set_radius(p_options[SNAME("primitive/radius")]);
		}

		Vector<Ref<Shape3D>> shapes;
		shapes.push_back(capsule);
		return shapes;
	}
	return Vector<Ref<Shape3D>>();
}

template <class M>
Transform3D ResourceImporterScene::get_collision_shapes_transform(const M &p_options) {
	Transform3D transform;

	ShapeType generate_shape_type = SHAPE_TYPE_DECOMPOSE_CONVEX;
	if (p_options.has(SNAME("physics/shape_type"))) {
		generate_shape_type = (ShapeType)p_options[SNAME("physics/shape_type")].operator int();
	}

	if (generate_shape_type == SHAPE_TYPE_BOX ||
			generate_shape_type == SHAPE_TYPE_SPHERE ||
			generate_shape_type == SHAPE_TYPE_CYLINDER ||
			generate_shape_type == SHAPE_TYPE_CAPSULE) {
		if (p_options.has(SNAME("primitive/position"))) {
			transform.origin = p_options[SNAME("primitive/position")];
		}

		if (p_options.has(SNAME("primitive/rotation"))) {
			transform.basis.set_euler((p_options[SNAME("primitive/rotation")].operator Vector3() / 180.0) * Math_PI);
		}
	}
	return transform;
}

#endif // RESOURCEIMPORTERSCENE_H