/*************************************************************************/
/*  editor_import_collada.cpp                                            */
/*************************************************************************/
/*                       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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#include "editor_import_collada.h"

#include "core/os/os.h"
#include "editor/editor_node.h"
#include "editor/import/collada.h"
#include "scene/3d/camera_3d.h"
#include "scene/3d/importer_mesh_instance_3d.h"
#include "scene/3d/light_3d.h"
#include "scene/3d/mesh_instance_3d.h"
#include "scene/3d/node_3d.h"
#include "scene/3d/path_3d.h"
#include "scene/3d/skeleton_3d.h"
#include "scene/animation/animation_player.h"
#include "scene/resources/animation.h"
#include "scene/resources/importer_mesh.h"
#include "scene/resources/packed_scene.h"
#include "scene/resources/surface_tool.h"

struct ColladaImport {
	Collada collada;
	Node3D *scene = nullptr;

	Vector<Ref<Animation>> animations;

	struct NodeMap {
		//String path;
		Node3D *node = nullptr;
		int bone = -1;
		List<int> anim_tracks;
	};

	bool found_ambient = false;
	Color ambient;
	bool found_directional = false;
	bool force_make_tangents = false;
	bool apply_mesh_xform_to_vertices = true;
	bool use_mesh_builtin_materials = false;
	float bake_fps = 15;

	Map<String, NodeMap> node_map; //map from collada node to engine node
	Map<String, String> node_name_map; //map from collada node to engine node
	Map<String, Ref<ImporterMesh>> mesh_cache;
	Map<String, Ref<Curve3D>> curve_cache;
	Map<String, Ref<Material>> material_cache;
	Map<Collada::Node *, Skeleton3D *> skeleton_map;

	Map<Skeleton3D *, Map<String, int>> skeleton_bone_map;

	Set<String> valid_animated_nodes;
	Vector<int> valid_animated_properties;
	Map<String, bool> bones_with_animation;

	Set<String> mesh_unique_names;
	Set<String> material_unique_names;

	Error _populate_skeleton(Skeleton3D *p_skeleton, Collada::Node *p_node, int &r_bone, int p_parent);
	Error _create_scene_skeletons(Collada::Node *p_node);
	Error _create_scene(Collada::Node *p_node, Node3D *p_parent);
	Error _create_resources(Collada::Node *p_node, bool p_use_compression);
	Error _create_material(const String &p_target);
	Error _create_mesh_surfaces(bool p_optimize, Ref<ImporterMesh> &p_mesh, const Map<String, Collada::NodeGeometry::Material> &p_material_map, const Collada::MeshData &meshdata, const Transform3D &p_local_xform, const Vector<int> &bone_remap, const Collada::SkinControllerData *p_skin_controller, const Collada::MorphControllerData *p_morph_data, Vector<Ref<ImporterMesh>> p_morph_meshes = Vector<Ref<ImporterMesh>>(), bool p_use_compression = false, bool p_use_mesh_material = false);
	Error load(const String &p_path, int p_flags, bool p_force_make_tangents = false, bool p_use_compression = false);
	void _fix_param_animation_tracks();
	void create_animation(int p_clip, bool p_import_value_tracks);
	void create_animations(bool p_import_value_tracks);

	Set<String> tracks_in_clips;
	Vector<String> missing_textures;

	void _pre_process_lights(Collada::Node *p_node);
};

Error ColladaImport::_populate_skeleton(Skeleton3D *p_skeleton, Collada::Node *p_node, int &r_bone, int p_parent) {
	if (p_node->type != Collada::Node::TYPE_JOINT) {
		return OK;
	}

	Collada::NodeJoint *joint = static_cast<Collada::NodeJoint *>(p_node);

	p_skeleton->add_bone(p_node->name);
	if (p_parent >= 0) {
		p_skeleton->set_bone_parent(r_bone, p_parent);
	}

	NodeMap nm;
	nm.node = p_skeleton;
	nm.bone = r_bone;
	node_map[p_node->id] = nm;
	node_name_map[p_node->name] = p_node->id;

	skeleton_bone_map[p_skeleton][joint->sid] = r_bone;

	{
		Transform3D xform = joint->compute_transform(collada);
		xform = collada.fix_transform(xform) * joint->post_transform;

		p_skeleton->set_bone_pose_position(r_bone, xform.origin);
		p_skeleton->set_bone_pose_rotation(r_bone, xform.basis.get_rotation_quaternion());
		p_skeleton->set_bone_pose_scale(r_bone, xform.basis.get_scale());
	}

	if (collada.state.bone_rest_map.has(joint->sid)) {
		p_skeleton->set_bone_rest(r_bone, collada.fix_transform(collada.state.bone_rest_map[joint->sid]));
		//should map this bone to something for animation?
	} else {
		WARN_PRINT("Collada: Joint has no rest.");
	}

	int id = r_bone++;
	for (int i = 0; i < p_node->children.size(); i++) {
		Error err = _populate_skeleton(p_skeleton, p_node->children[i], r_bone, id);
		if (err) {
			return err;
		}
	}

	return OK;
}

void ColladaImport::_pre_process_lights(Collada::Node *p_node) {
	if (p_node->type == Collada::Node::TYPE_LIGHT) {
		Collada::NodeLight *light = static_cast<Collada::NodeLight *>(p_node);
		if (collada.state.light_data_map.has(light->light)) {
			Collada::LightData &ld = collada.state.light_data_map[light->light];
			if (ld.mode == Collada::LightData::MODE_AMBIENT) {
				found_ambient = true;
				ambient = ld.color;
			}
			if (ld.mode == Collada::LightData::MODE_DIRECTIONAL) {
				found_directional = true;
			}
		}
	}

	for (int i = 0; i < p_node->children.size(); i++) {
		_pre_process_lights(p_node->children[i]);
	}
}

Error ColladaImport::_create_scene_skeletons(Collada::Node *p_node) {
	if (p_node->type == Collada::Node::TYPE_SKELETON) {
		Skeleton3D *sk = memnew(Skeleton3D);
		int bone = 0;
		for (int i = 0; i < p_node->children.size(); i++) {
			_populate_skeleton(sk, p_node->children[i], bone, -1);
		}
		sk->localize_rests(); //after creating skeleton, rests must be localized...!
		skeleton_map[p_node] = sk;
	}

	for (int i = 0; i < p_node->children.size(); i++) {
		Error err = _create_scene_skeletons(p_node->children[i]);
		if (err) {
			return err;
		}
	}
	return OK;
}

Error ColladaImport::_create_scene(Collada::Node *p_node, Node3D *p_parent) {
	Node3D *node = nullptr;

	switch (p_node->type) {
		case Collada::Node::TYPE_NODE: {
			node = memnew(Node3D);
		} break;
		case Collada::Node::TYPE_JOINT: {
			return OK; // do nothing
		} break;
		case Collada::Node::TYPE_LIGHT: {
			//node = memnew( Light)
			Collada::NodeLight *light = static_cast<Collada::NodeLight *>(p_node);
			if (collada.state.light_data_map.has(light->light)) {
				Collada::LightData &ld = collada.state.light_data_map[light->light];

				if (ld.mode == Collada::LightData::MODE_AMBIENT) {
					if (found_directional) {
						return OK; //do nothing not needed
					}

					if (!bool(GLOBAL_DEF("collada/use_ambient", false))) {
						return OK;
					}
					//well, it's an ambient light..
					Light3D *l = memnew(DirectionalLight3D);
					//l->set_color(Light::COLOR_AMBIENT,ld.color);
					//l->set_color(Light::COLOR_DIFFUSE,Color(0,0,0));
					//l->set_color(Light::COLOR_SPECULAR,Color(0,0,0));
					node = l;

				} else if (ld.mode == Collada::LightData::MODE_DIRECTIONAL) {
					//well, it's an ambient light..
					Light3D *l = memnew(DirectionalLight3D);
					/*
					if (found_ambient) //use it here
						l->set_color(Light::COLOR_AMBIENT,ambient);

					l->set_color(Light::COLOR_DIFFUSE,ld.color);
					l->set_color(Light::COLOR_SPECULAR,Color(1,1,1));
					*/
					node = l;
				} else {
					Light3D *l;

					if (ld.mode == Collada::LightData::MODE_OMNI) {
						l = memnew(OmniLight3D);
					} else {
						l = memnew(SpotLight3D);
						//l->set_parameter(Light::PARAM_SPOT_ANGLE,ld.spot_angle);
						//l->set_parameter(Light::PARAM_SPOT_ATTENUATION,ld.spot_exp);
					}

					//
					//l->set_color(Light::COLOR_DIFFUSE,ld.color);
					//l->set_color(Light::COLOR_SPECULAR,Color(1,1,1));
					//l->approximate_opengl_attenuation(ld.constant_att,ld.linear_att,ld.quad_att);
					node = l;
				}

			} else {
				node = memnew(Node3D);
			}
		} break;
		case Collada::Node::TYPE_CAMERA: {
			Collada::NodeCamera *cam = static_cast<Collada::NodeCamera *>(p_node);
			Camera3D *camera = memnew(Camera3D);

			if (collada.state.camera_data_map.has(cam->camera)) {
				const Collada::CameraData &cd = collada.state.camera_data_map[cam->camera];

				switch (cd.mode) {
					case Collada::CameraData::MODE_ORTHOGONAL: {
						if (cd.orthogonal.y_mag) {
							camera->set_keep_aspect_mode(Camera3D::KEEP_HEIGHT);
							camera->set_orthogonal(cd.orthogonal.y_mag * 2.0, cd.z_near, cd.z_far);

						} else if (!cd.orthogonal.y_mag && cd.orthogonal.x_mag) {
							camera->set_keep_aspect_mode(Camera3D::KEEP_WIDTH);
							camera->set_orthogonal(cd.orthogonal.x_mag * 2.0, cd.z_near, cd.z_far);
						}

					} break;
					case Collada::CameraData::MODE_PERSPECTIVE: {
						if (cd.perspective.y_fov) {
							camera->set_perspective(cd.perspective.y_fov, cd.z_near, cd.z_far);

						} else if (!cd.perspective.y_fov && cd.perspective.x_fov) {
							camera->set_perspective(cd.perspective.x_fov / cd.aspect, cd.z_near, cd.z_far);
						}

					} break;
				}
			}

			node = camera;

		} break;
		case Collada::Node::TYPE_GEOMETRY: {
			Collada::NodeGeometry *ng = static_cast<Collada::NodeGeometry *>(p_node);

			if (collada.state.curve_data_map.has(ng->source)) {
				node = memnew(Path3D);
			} else {
				//mesh since nothing else
				node = memnew(ImporterMeshInstance3D);
				//Object::cast_to<ImporterMeshInstance3D>(node)->set_flag(GeometryInstance3D::FLAG_USE_BAKED_LIGHT, true);
			}
		} break;
		case Collada::Node::TYPE_SKELETON: {
			ERR_FAIL_COND_V(!skeleton_map.has(p_node), ERR_CANT_CREATE);
			Skeleton3D *sk = skeleton_map[p_node];
			node = sk;
		} break;
	}

	if (!p_node->name.is_empty()) {
		node->set_name(p_node->name);
	}
	NodeMap nm;
	nm.node = node;
	node_map[p_node->id] = nm;
	node_name_map[node->get_name()] = p_node->id;
	Transform3D xf = p_node->default_transform;

	xf = collada.fix_transform(xf) * p_node->post_transform;
	node->set_transform(xf);
	p_parent->add_child(node, true);
	node->set_owner(scene);

	if (!p_node->empty_draw_type.is_empty()) {
		node->set_meta("empty_draw_type", Variant(p_node->empty_draw_type));
	}

	for (int i = 0; i < p_node->children.size(); i++) {
		Error err = _create_scene(p_node->children[i], node);
		if (err) {
			return err;
		}
	}
	return OK;
}

Error ColladaImport::_create_material(const String &p_target) {
	ERR_FAIL_COND_V(material_cache.has(p_target), ERR_ALREADY_EXISTS);
	ERR_FAIL_COND_V(!collada.state.material_map.has(p_target), ERR_INVALID_PARAMETER);
	Collada::Material &src_mat = collada.state.material_map[p_target];
	ERR_FAIL_COND_V(!collada.state.effect_map.has(src_mat.instance_effect), ERR_INVALID_PARAMETER);
	Collada::Effect &effect = collada.state.effect_map[src_mat.instance_effect];

	Ref<StandardMaterial3D> material = memnew(StandardMaterial3D);

	String base_name;
	if (!src_mat.name.is_empty()) {
		base_name = src_mat.name;
	} else if (!effect.name.is_empty()) {
		base_name = effect.name;
	} else {
		base_name = "Material";
	}

	String name = base_name;
	int counter = 2;
	while (material_unique_names.has(name)) {
		name = base_name + itos(counter++);
	}

	material_unique_names.insert(name);

	material->set_name(name);

	// DIFFUSE

	if (!effect.diffuse.texture.is_empty()) {
		String texfile = effect.get_texture_path(effect.diffuse.texture, collada);
		if (!texfile.is_empty()) {
			if (texfile.begins_with("/")) {
				texfile = texfile.replace_first("/", "res://");
			}
			Ref<Texture2D> texture = ResourceLoader::load(texfile, "Texture2D");
			if (texture.is_valid()) {
				material->set_texture(StandardMaterial3D::TEXTURE_ALBEDO, texture);
				material->set_albedo(Color(1, 1, 1, 1));
				//material->set_parameter(StandardMaterial3D::PARAM_DIFFUSE,Color(1,1,1,1));
			} else {
				missing_textures.push_back(texfile.get_file());
			}
		}
	} else {
		material->set_albedo(effect.diffuse.color);
	}

	// SPECULAR

	if (!effect.specular.texture.is_empty()) {
		String texfile = effect.get_texture_path(effect.specular.texture, collada);
		if (!texfile.is_empty()) {
			if (texfile.begins_with("/")) {
				texfile = texfile.replace_first("/", "res://");
			}

			Ref<Texture2D> texture = ResourceLoader::load(texfile, "Texture2D");
			if (texture.is_valid()) {
				material->set_texture(StandardMaterial3D::TEXTURE_METALLIC, texture);
				material->set_specular(1.0);

				//material->set_texture(StandardMaterial3D::PARAM_SPECULAR,texture);
				//material->set_parameter(StandardMaterial3D::PARAM_SPECULAR,Color(1,1,1,1));
			} else {
				missing_textures.push_back(texfile.get_file());
			}
		}

	} else {
		material->set_metallic(effect.specular.color.get_v());
	}

	// EMISSION

	if (!effect.emission.texture.is_empty()) {
		String texfile = effect.get_texture_path(effect.emission.texture, collada);
		if (!texfile.is_empty()) {
			if (texfile.begins_with("/")) {
				texfile = texfile.replace_first("/", "res://");
			}

			Ref<Texture2D> texture = ResourceLoader::load(texfile, "Texture2D");
			if (texture.is_valid()) {
				material->set_feature(StandardMaterial3D::FEATURE_EMISSION, true);
				material->set_texture(StandardMaterial3D::TEXTURE_EMISSION, texture);
				material->set_emission(Color(1, 1, 1, 1));

				//material->set_parameter(StandardMaterial3D::PARAM_EMISSION,Color(1,1,1,1));
			} else {
				missing_textures.push_back(texfile.get_file());
			}
		}
	} else {
		if (effect.emission.color != Color()) {
			material->set_feature(StandardMaterial3D::FEATURE_EMISSION, true);
			material->set_emission(effect.emission.color);
		}
	}

	// NORMAL

	if (!effect.bump.texture.is_empty()) {
		String texfile = effect.get_texture_path(effect.bump.texture, collada);
		if (!texfile.is_empty()) {
			if (texfile.begins_with("/")) {
				texfile = texfile.replace_first("/", "res://");
			}

			Ref<Texture2D> texture = ResourceLoader::load(texfile, "Texture2D");
			if (texture.is_valid()) {
				material->set_feature(StandardMaterial3D::FEATURE_NORMAL_MAPPING, true);
				material->set_texture(StandardMaterial3D::TEXTURE_NORMAL, texture);
				//material->set_emission(Color(1,1,1,1));

				//material->set_texture(StandardMaterial3D::PARAM_NORMAL,texture);
			} else {
				//missing_textures.push_back(texfile.get_file());
			}
		}
	}

	float roughness = (effect.shininess - 1.0) / 510;
	material->set_roughness(roughness);

	if (effect.double_sided) {
		material->set_cull_mode(StandardMaterial3D::CULL_DISABLED);
	}
	if (effect.unshaded) {
		material->set_shading_mode(StandardMaterial3D::SHADING_MODE_UNSHADED);
	}

	material_cache[p_target] = material;
	return OK;
}

Error ColladaImport::_create_mesh_surfaces(bool p_optimize, Ref<ImporterMesh> &p_mesh, const Map<String, Collada::NodeGeometry::Material> &p_material_map, const Collada::MeshData &meshdata, const Transform3D &p_local_xform, const Vector<int> &bone_remap, const Collada::SkinControllerData *p_skin_controller, const Collada::MorphControllerData *p_morph_data, Vector<Ref<ImporterMesh>> p_morph_meshes, bool p_use_compression, bool p_use_mesh_material) {
	bool local_xform_mirror = p_local_xform.basis.determinant() < 0;

	if (p_morph_data) {
		//add morph target
		ERR_FAIL_COND_V(!p_morph_data->targets.has("MORPH_TARGET"), ERR_INVALID_DATA);
		String mt = p_morph_data->targets["MORPH_TARGET"];
		ERR_FAIL_COND_V(!p_morph_data->sources.has(mt), ERR_INVALID_DATA);
		int morph_targets = p_morph_data->sources[mt].sarray.size();
		for (int i = 0; i < morph_targets; i++) {
			String target = p_morph_data->sources[mt].sarray[i];
			ERR_FAIL_COND_V(!collada.state.mesh_data_map.has(target), ERR_INVALID_DATA);
			String name = collada.state.mesh_data_map[target].name;

			p_mesh->add_blend_shape(name);
		}
		if (p_morph_data->mode == "RELATIVE") {
			p_mesh->set_blend_shape_mode(Mesh::BLEND_SHAPE_MODE_RELATIVE);
		} else if (p_morph_data->mode == "NORMALIZED") {
			p_mesh->set_blend_shape_mode(Mesh::BLEND_SHAPE_MODE_NORMALIZED);
		}
	}

	int surface = 0;
	for (int p_i = 0; p_i < meshdata.primitives.size(); p_i++) {
		const Collada::MeshData::Primitives &p = meshdata.primitives[p_i];

		/* VERTEX SOURCE */
		ERR_FAIL_COND_V(!p.sources.has("VERTEX"), ERR_INVALID_DATA);

		String vertex_src_id = p.sources["VERTEX"].source;
		int vertex_ofs = p.sources["VERTEX"].offset;

		ERR_FAIL_COND_V(!meshdata.vertices.has(vertex_src_id), ERR_INVALID_DATA);

		ERR_FAIL_COND_V(!meshdata.vertices[vertex_src_id].sources.has("POSITION"), ERR_INVALID_DATA);
		String position_src_id = meshdata.vertices[vertex_src_id].sources["POSITION"];

		ERR_FAIL_COND_V(!meshdata.sources.has(position_src_id), ERR_INVALID_DATA);

		const Collada::MeshData::Source *vertex_src = &meshdata.sources[position_src_id];

		/* NORMAL SOURCE */

		const Collada::MeshData::Source *normal_src = nullptr;
		int normal_ofs = 0;

		{
			String normal_source_id = "";

			if (p.sources.has("NORMAL")) {
				normal_source_id = p.sources["NORMAL"].source;
				normal_ofs = p.sources["NORMAL"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("NORMAL")) {
				normal_source_id = meshdata.vertices[vertex_src_id].sources["NORMAL"];
				normal_ofs = vertex_ofs;
			}

			if (!normal_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(normal_source_id), ERR_INVALID_DATA);
				normal_src = &meshdata.sources[normal_source_id];
			}
		}

		const Collada::MeshData::Source *binormal_src = nullptr;
		int binormal_ofs = 0;

		{
			String binormal_source_id = "";

			if (p.sources.has("TEXBINORMAL")) {
				binormal_source_id = p.sources["TEXBINORMAL"].source;
				binormal_ofs = p.sources["TEXBINORMAL"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("TEXBINORMAL")) {
				binormal_source_id = meshdata.vertices[vertex_src_id].sources["TEXBINORMAL"];
				binormal_ofs = vertex_ofs;
			}

			if (!binormal_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(binormal_source_id), ERR_INVALID_DATA);
				binormal_src = &meshdata.sources[binormal_source_id];
			}
		}

		const Collada::MeshData::Source *tangent_src = nullptr;
		int tangent_ofs = 0;

		{
			String tangent_source_id = "";

			if (p.sources.has("TEXTANGENT")) {
				tangent_source_id = p.sources["TEXTANGENT"].source;
				tangent_ofs = p.sources["TEXTANGENT"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("TEXTANGENT")) {
				tangent_source_id = meshdata.vertices[vertex_src_id].sources["TEXTANGENT"];
				tangent_ofs = vertex_ofs;
			}

			if (!tangent_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(tangent_source_id), ERR_INVALID_DATA);
				tangent_src = &meshdata.sources[tangent_source_id];
			}
		}

		const Collada::MeshData::Source *uv_src = nullptr;
		int uv_ofs = 0;

		{
			String uv_source_id = "";

			if (p.sources.has("TEXCOORD0")) {
				uv_source_id = p.sources["TEXCOORD0"].source;
				uv_ofs = p.sources["TEXCOORD0"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("TEXCOORD0")) {
				uv_source_id = meshdata.vertices[vertex_src_id].sources["TEXCOORD0"];
				uv_ofs = vertex_ofs;
			}

			if (!uv_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(uv_source_id), ERR_INVALID_DATA);
				uv_src = &meshdata.sources[uv_source_id];
			}
		}

		const Collada::MeshData::Source *uv2_src = nullptr;
		int uv2_ofs = 0;

		{
			String uv2_source_id = "";

			if (p.sources.has("TEXCOORD1")) {
				uv2_source_id = p.sources["TEXCOORD1"].source;
				uv2_ofs = p.sources["TEXCOORD1"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("TEXCOORD1")) {
				uv2_source_id = meshdata.vertices[vertex_src_id].sources["TEXCOORD1"];
				uv2_ofs = vertex_ofs;
			}

			if (!uv2_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(uv2_source_id), ERR_INVALID_DATA);
				uv2_src = &meshdata.sources[uv2_source_id];
			}
		}

		const Collada::MeshData::Source *color_src = nullptr;
		int color_ofs = 0;

		{
			String color_source_id = "";

			if (p.sources.has("COLOR")) {
				color_source_id = p.sources["COLOR"].source;
				color_ofs = p.sources["COLOR"].offset;
			} else if (meshdata.vertices[vertex_src_id].sources.has("COLOR")) {
				color_source_id = meshdata.vertices[vertex_src_id].sources["COLOR"];
				color_ofs = vertex_ofs;
			}

			if (!color_source_id.is_empty()) {
				ERR_FAIL_COND_V(!meshdata.sources.has(color_source_id), ERR_INVALID_DATA);
				color_src = &meshdata.sources[color_source_id];
			}
		}

		//find largest source..

		/************************/
		/* ADD WEIGHTS IF EXIST */
		/************************/

		Map<int, Vector<Collada::Vertex::Weight>> pre_weights;

		bool has_weights = false;

		if (p_skin_controller) {
			const Collada::SkinControllerData::Source *weight_src = nullptr;
			int weight_ofs = 0;

			if (p_skin_controller->weights.sources.has("WEIGHT")) {
				String weight_id = p_skin_controller->weights.sources["WEIGHT"].source;
				weight_ofs = p_skin_controller->weights.sources["WEIGHT"].offset;
				if (p_skin_controller->sources.has(weight_id)) {
					weight_src = &p_skin_controller->sources[weight_id];
				}
			}

			int joint_ofs = 0;

			if (p_skin_controller->weights.sources.has("JOINT")) {
				joint_ofs = p_skin_controller->weights.sources["JOINT"].offset;
			}

			//should be OK, given this was pre-checked.

			int index_ofs = 0;
			int wstride = p_skin_controller->weights.sources.size();
			for (int w_i = 0; w_i < p_skin_controller->weights.sets.size(); w_i++) {
				int amount = p_skin_controller->weights.sets[w_i];

				Vector<Collada::Vertex::Weight> weights;

				for (int a_i = 0; a_i < amount; a_i++) {
					Collada::Vertex::Weight w;

					int read_from = index_ofs + a_i * wstride;
					ERR_FAIL_INDEX_V(read_from + wstride - 1, p_skin_controller->weights.indices.size(), ERR_INVALID_DATA);
					int weight_index = p_skin_controller->weights.indices[read_from + weight_ofs];
					ERR_FAIL_INDEX_V(weight_index, weight_src->array.size(), ERR_INVALID_DATA);

					w.weight = weight_src->array[weight_index];

					int bone_index = p_skin_controller->weights.indices[read_from + joint_ofs];
					if (bone_index == -1) {
						continue; //ignore this weight (refers to bind shape)
					}
					ERR_FAIL_INDEX_V(bone_index, bone_remap.size(), ERR_INVALID_DATA);

					w.bone_idx = bone_remap[bone_index];

					weights.push_back(w);
				}

				/* FIX WEIGHTS */

				weights.sort();

				if (weights.size() > 4) {
					//cap to 4 and make weights add up 1
					weights.resize(4);
				}

				//make sure weights always add up to 1
				float total = 0;
				for (int i = 0; i < weights.size(); i++) {
					total += weights[i].weight;
				}
				if (total) {
					for (int i = 0; i < weights.size(); i++) {
						weights.write[i].weight /= total;
					}
				}

				if (weights.size() == 0 || total == 0) { //if nothing, add a weight to bone 0
					//no weights assigned
					Collada::Vertex::Weight w;
					w.bone_idx = 0;
					w.weight = 1.0;
					weights.clear();
					weights.push_back(w);
				}

				pre_weights[w_i] = weights;

				index_ofs += wstride * amount;
			}

			//vertices need to be localized
			has_weights = true;
		}

		Set<Collada::Vertex> vertex_set; //vertex set will be the vertices
		List<int> indices_list; //indices will be the indices

		/**************************/
		/* CREATE PRIMITIVE ARRAY */
		/**************************/

		// The way collada uses indices is more optimal, and friendlier with 3D modelling software,
		// because it can index everything, not only vertices (similar to how the WII works).
		// This is, however, more incompatible with standard video cards, so arrays must be converted.
		// Must convert to GL/DX format.

		int _prim_ofs = 0;
		int vertidx = 0;
		for (int p_j = 0; p_j < p.count; p_j++) {
			int amount;
			if (p.polygons.size()) {
				ERR_FAIL_INDEX_V(p_j, p.polygons.size(), ERR_INVALID_DATA);
				amount = p.polygons[p_j];
			} else {
				amount = 3; //triangles;
			}

			//COLLADA_PRINT("amount: "+itos(amount));

			int prev2[2] = { 0, 0 };

			for (int j = 0; j < amount; j++) {
				int src = _prim_ofs;
				//_prim_ofs+=p.sources.size()

				ERR_FAIL_INDEX_V(src, p.indices.size(), ERR_INVALID_DATA);

				Collada::Vertex vertex;
				if (!p_optimize) {
					vertex.uid = vertidx++;
				}

				int vertex_index = p.indices[src + vertex_ofs]; //used for index field (later used by controllers)
				int vertex_pos = (vertex_src->stride ? vertex_src->stride : 3) * vertex_index;
				ERR_FAIL_INDEX_V(vertex_pos + 0, vertex_src->array.size(), ERR_INVALID_DATA);
				ERR_FAIL_INDEX_V(vertex_pos + 2, vertex_src->array.size(), ERR_INVALID_DATA);
				vertex.vertex = Vector3(vertex_src->array[vertex_pos + 0], vertex_src->array[vertex_pos + 1], vertex_src->array[vertex_pos + 2]);

				if (pre_weights.has(vertex_index)) {
					vertex.weights = pre_weights[vertex_index];
				}

				if (normal_src) {
					int normal_pos = (normal_src->stride ? normal_src->stride : 3) * p.indices[src + normal_ofs];
					ERR_FAIL_INDEX_V(normal_pos + 0, normal_src->array.size(), ERR_INVALID_DATA);
					ERR_FAIL_INDEX_V(normal_pos + 2, normal_src->array.size(), ERR_INVALID_DATA);
					vertex.normal = Vector3(normal_src->array[normal_pos + 0], normal_src->array[normal_pos + 1], normal_src->array[normal_pos + 2]);

					if (tangent_src && binormal_src) {
						int binormal_pos = (binormal_src->stride ? binormal_src->stride : 3) * p.indices[src + binormal_ofs];
						ERR_FAIL_INDEX_V(binormal_pos + 0, binormal_src->array.size(), ERR_INVALID_DATA);
						ERR_FAIL_INDEX_V(binormal_pos + 2, binormal_src->array.size(), ERR_INVALID_DATA);
						Vector3 binormal = Vector3(binormal_src->array[binormal_pos + 0], binormal_src->array[binormal_pos + 1], binormal_src->array[binormal_pos + 2]);

						int tangent_pos = (tangent_src->stride ? tangent_src->stride : 3) * p.indices[src + tangent_ofs];
						ERR_FAIL_INDEX_V(tangent_pos + 0, tangent_src->array.size(), ERR_INVALID_DATA);
						ERR_FAIL_INDEX_V(tangent_pos + 2, tangent_src->array.size(), ERR_INVALID_DATA);
						Vector3 tangent = Vector3(tangent_src->array[tangent_pos + 0], tangent_src->array[tangent_pos + 1], tangent_src->array[tangent_pos + 2]);

						vertex.tangent.normal = tangent;
						vertex.tangent.d = vertex.normal.cross(tangent).dot(binormal) > 0 ? 1 : -1;
					}
				}

				if (uv_src) {
					int uv_pos = (uv_src->stride ? uv_src->stride : 2) * p.indices[src + uv_ofs];
					ERR_FAIL_INDEX_V(uv_pos + 0, uv_src->array.size(), ERR_INVALID_DATA);
					ERR_FAIL_INDEX_V(uv_pos + 1, uv_src->array.size(), ERR_INVALID_DATA);
					vertex.uv = Vector3(uv_src->array[uv_pos + 0], 1.0 - uv_src->array[uv_pos + 1], 0);
				}

				if (uv2_src) {
					int uv2_pos = (uv2_src->stride ? uv2_src->stride : 2) * p.indices[src + uv2_ofs];
					ERR_FAIL_INDEX_V(uv2_pos + 0, uv2_src->array.size(), ERR_INVALID_DATA);
					ERR_FAIL_INDEX_V(uv2_pos + 1, uv2_src->array.size(), ERR_INVALID_DATA);
					vertex.uv2 = Vector3(uv2_src->array[uv2_pos + 0], 1.0 - uv2_src->array[uv2_pos + 1], 0);
				}

				if (color_src) {
					int color_pos = (color_src->stride ? color_src->stride : 3) * p.indices[src + color_ofs]; // colors are RGB in collada..
					ERR_FAIL_INDEX_V(color_pos + 0, color_src->array.size(), ERR_INVALID_DATA);
					ERR_FAIL_INDEX_V(color_pos + ((color_src->stride > 3) ? 3 : 2), color_src->array.size(), ERR_INVALID_DATA);
					vertex.color = Color(color_src->array[color_pos + 0], color_src->array[color_pos + 1], color_src->array[color_pos + 2], (color_src->stride > 3) ? color_src->array[color_pos + 3] : 1.0);
				}

#ifndef NO_UP_AXIS_SWAP
				if (collada.state.up_axis == Vector3::AXIS_Z) {
					Vector3 bn = vertex.normal.cross(vertex.tangent.normal) * vertex.tangent.d;

					SWAP(vertex.vertex.z, vertex.vertex.y);
					vertex.vertex.z = -vertex.vertex.z;
					SWAP(vertex.normal.z, vertex.normal.y);
					vertex.normal.z = -vertex.normal.z;
					SWAP(vertex.tangent.normal.z, vertex.tangent.normal.y);
					vertex.tangent.normal.z = -vertex.tangent.normal.z;
					SWAP(bn.z, bn.y);
					bn.z = -bn.z;

					vertex.tangent.d = vertex.normal.cross(vertex.tangent.normal).dot(bn) > 0 ? 1 : -1;
				}

#endif

				vertex.fix_unit_scale(collada);
				int index = 0;
				//COLLADA_PRINT("vertex: "+vertex.vertex);

				if (vertex_set.has(vertex)) {
					index = vertex_set.find(vertex)->get().idx;
				} else {
					index = vertex_set.size();
					vertex.idx = index;
					vertex_set.insert(vertex);
				}

				//build triangles if needed
				if (j == 0) {
					prev2[0] = index;
				}

				if (j >= 2) {
					//insert indices in reverse order (collada uses CCW as frontface)
					if (local_xform_mirror) {
						indices_list.push_back(prev2[0]);
						indices_list.push_back(prev2[1]);
						indices_list.push_back(index);

					} else {
						indices_list.push_back(prev2[0]);
						indices_list.push_back(index);
						indices_list.push_back(prev2[1]);
					}
				}

				prev2[1] = index;
				_prim_ofs += p.vertex_size;
			}
		}

		Vector<Collada::Vertex> vertex_array; //there we go, vertex array

		vertex_array.resize(vertex_set.size());
		for (Set<Collada::Vertex>::Element *F = vertex_set.front(); F; F = F->next()) {
			vertex_array.write[F->get().idx] = F->get();
		}

		if (has_weights) {
			//if skeleton, localize
			Transform3D local_xform = p_local_xform;
			for (int i = 0; i < vertex_array.size(); i++) {
				vertex_array.write[i].vertex = local_xform.xform(vertex_array[i].vertex);
				vertex_array.write[i].normal = local_xform.basis.xform(vertex_array[i].normal).normalized();
				vertex_array.write[i].tangent.normal = local_xform.basis.xform(vertex_array[i].tangent.normal).normalized();
				if (local_xform_mirror) {
					//i shouldn't do this? wtf?
					//vertex_array[i].normal*=-1.0;
					//vertex_array[i].tangent.normal*=-1.0;
				}
			}
		}

		/*****************/
		/* MAKE SURFACES  */
		/*****************/

		{
			Ref<StandardMaterial3D> material;

			{
				if (p_material_map.has(p.material)) {
					String target = p_material_map[p.material].target;

					if (!material_cache.has(target)) {
						Error err = _create_material(target);
						if (!err) {
							material = material_cache[target];
						}
					} else {
						material = material_cache[target];
					}

				} else if (!p.material.is_empty()) {
					WARN_PRINT("Collada: Unreferenced material in geometry instance: " + p.material);
				}
			}

			Ref<SurfaceTool> surftool;
			surftool.instantiate();
			surftool->begin(Mesh::PRIMITIVE_TRIANGLES);

			for (int k = 0; k < vertex_array.size(); k++) {
				if (normal_src) {
					surftool->set_normal(vertex_array[k].normal);
					if (binormal_src && tangent_src) {
						surftool->set_tangent(vertex_array[k].tangent);
					}
				}
				if (uv_src) {
					surftool->set_uv(Vector2(vertex_array[k].uv.x, vertex_array[k].uv.y));
				}
				if (uv2_src) {
					surftool->set_uv2(Vector2(vertex_array[k].uv2.x, vertex_array[k].uv2.y));
				}
				if (color_src) {
					surftool->set_color(vertex_array[k].color);
				}

				if (has_weights) {
					Vector<float> weights;
					Vector<int> bones;
					weights.resize(RS::ARRAY_WEIGHTS_SIZE);
					bones.resize(RS::ARRAY_WEIGHTS_SIZE);
					//float sum=0.0;
					for (int l = 0; l < RS::ARRAY_WEIGHTS_SIZE; l++) {
						if (l < vertex_array[k].weights.size()) {
							weights.write[l] = vertex_array[k].weights[l].weight;
							bones.write[l] = vertex_array[k].weights[l].bone_idx;
							//sum += vertex_array[k].weights[l].weight;
						} else {
							weights.write[l] = 0;
							bones.write[l] = 0;
						}
					}

					surftool->set_bones(bones);
					surftool->set_weights(weights);
				}

				surftool->add_vertex(vertex_array[k].vertex);
			}

			for (int &E : indices_list) {
				surftool->add_index(E);
			}

			if (!normal_src) {
				//should always be normals
				surftool->generate_normals();
			}

			if ((!binormal_src || !tangent_src) && normal_src && uv_src && force_make_tangents) {
				surftool->generate_tangents();
			}

			////////////////////////////
			// FINALLY CREATE SUFRACE //
			////////////////////////////

			Array d = surftool->commit_to_arrays();
			d.resize(RS::ARRAY_MAX);

			Array mr;

			////////////////////////////
			// THEN THE MORPH TARGETS //
			////////////////////////////

			for (int mi = 0; mi < p_morph_meshes.size(); mi++) {
				Array a = p_morph_meshes[mi]->get_surface_arrays(surface);
				//add valid weight and bone arrays if they exist, TODO check if they are unique to shape (generally not)

				if (has_weights) {
					a[Mesh::ARRAY_WEIGHTS] = d[Mesh::ARRAY_WEIGHTS];
					a[Mesh::ARRAY_BONES] = d[Mesh::ARRAY_BONES];
				}

				a[Mesh::ARRAY_INDEX] = Variant();
				//a.resize(Mesh::ARRAY_MAX); //no need for index
				mr.push_back(a);
			}

			String surface_name;
			Ref<Material> mat;
			if (material.is_valid()) {
				if (p_use_mesh_material) {
					mat = material;
				}
				surface_name = material->get_name();
			}
			p_mesh->add_surface(Mesh::PRIMITIVE_TRIANGLES, d, mr, Dictionary(), mat, surface_name);
		}

		/*****************/
		/* FIND MATERIAL */
		/*****************/

		surface++;
	}

	return OK;
}

Error ColladaImport::_create_resources(Collada::Node *p_node, bool p_use_compression) {
	if (p_node->type == Collada::Node::TYPE_GEOMETRY && node_map.has(p_node->id)) {
		Node3D *node = node_map[p_node->id].node;
		Collada::NodeGeometry *ng = static_cast<Collada::NodeGeometry *>(p_node);

		if (Object::cast_to<Path3D>(node)) {
			Path3D *path = Object::cast_to<Path3D>(node);

			if (curve_cache.has(ng->source)) {
				path->set_curve(curve_cache[ng->source]);
			} else {
				Ref<Curve3D> c = memnew(Curve3D);

				const Collada::CurveData &cd = collada.state.curve_data_map[ng->source];

				ERR_FAIL_COND_V(!cd.control_vertices.has("POSITION"), ERR_INVALID_DATA);
				ERR_FAIL_COND_V(!cd.control_vertices.has("IN_TANGENT"), ERR_INVALID_DATA);
				ERR_FAIL_COND_V(!cd.control_vertices.has("OUT_TANGENT"), ERR_INVALID_DATA);
				ERR_FAIL_COND_V(!cd.control_vertices.has("INTERPOLATION"), ERR_INVALID_DATA);

				ERR_FAIL_COND_V(!cd.sources.has(cd.control_vertices["POSITION"]), ERR_INVALID_DATA);
				const Collada::CurveData::Source &vertices = cd.sources[cd.control_vertices["POSITION"]];
				ERR_FAIL_COND_V(vertices.stride != 3, ERR_INVALID_DATA);

				ERR_FAIL_COND_V(!cd.sources.has(cd.control_vertices["IN_TANGENT"]), ERR_INVALID_DATA);
				const Collada::CurveData::Source &in_tangents = cd.sources[cd.control_vertices["IN_TANGENT"]];
				ERR_FAIL_COND_V(in_tangents.stride != 3, ERR_INVALID_DATA);

				ERR_FAIL_COND_V(!cd.sources.has(cd.control_vertices["OUT_TANGENT"]), ERR_INVALID_DATA);
				const Collada::CurveData::Source &out_tangents = cd.sources[cd.control_vertices["OUT_TANGENT"]];
				ERR_FAIL_COND_V(out_tangents.stride != 3, ERR_INVALID_DATA);

				ERR_FAIL_COND_V(!cd.sources.has(cd.control_vertices["INTERPOLATION"]), ERR_INVALID_DATA);
				const Collada::CurveData::Source &interps = cd.sources[cd.control_vertices["INTERPOLATION"]];
				ERR_FAIL_COND_V(interps.stride != 1, ERR_INVALID_DATA);

				const Collada::CurveData::Source *tilts = nullptr;
				if (cd.control_vertices.has("TILT") && cd.sources.has(cd.control_vertices["TILT"])) {
					tilts = &cd.sources[cd.control_vertices["TILT"]];
				}

				int pc = vertices.array.size() / 3;
				for (int i = 0; i < pc; i++) {
					Vector3 pos(vertices.array[i * 3 + 0], vertices.array[i * 3 + 1], vertices.array[i * 3 + 2]);
					Vector3 in(in_tangents.array[i * 3 + 0], in_tangents.array[i * 3 + 1], in_tangents.array[i * 3 + 2]);
					Vector3 out(out_tangents.array[i * 3 + 0], out_tangents.array[i * 3 + 1], out_tangents.array[i * 3 + 2]);

#ifndef NO_UP_AXIS_SWAP
					if (collada.state.up_axis == Vector3::AXIS_Z) {
						SWAP(pos.y, pos.z);
						pos.z = -pos.z;
						SWAP(in.y, in.z);
						in.z = -in.z;
						SWAP(out.y, out.z);
						out.z = -out.z;
					}
#endif
					pos *= collada.state.unit_scale;
					in *= collada.state.unit_scale;
					out *= collada.state.unit_scale;

					c->add_point(pos, in - pos, out - pos);
					if (tilts) {
						c->set_point_tilt(i, tilts->array[i]);
					}
				}

				curve_cache[ng->source] = c;
				path->set_curve(c);
			}
		}

		if (Object::cast_to<ImporterMeshInstance3D>(node)) {
			Collada::NodeGeometry *ng2 = static_cast<Collada::NodeGeometry *>(p_node);

			ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(node);

			ERR_FAIL_COND_V(!mi, ERR_BUG);

			Collada::SkinControllerData *skin = nullptr;
			Collada::MorphControllerData *morph = nullptr;
			String meshid;
			Transform3D apply_xform;
			Vector<int> bone_remap;
			Vector<Ref<ImporterMesh>> morphs;

			if (ng2->controller) {
				String ngsource = ng2->source;

				if (collada.state.skin_controller_data_map.has(ngsource)) {
					ERR_FAIL_COND_V(!collada.state.skin_controller_data_map.has(ngsource), ERR_INVALID_DATA);
					skin = &collada.state.skin_controller_data_map[ngsource];

					Vector<String> skeletons = ng2->skeletons;

					ERR_FAIL_COND_V(skeletons.is_empty(), ERR_INVALID_DATA);

					String skname = skeletons[0];
					ERR_FAIL_COND_V(!node_map.has(skname), ERR_INVALID_DATA);
					NodeMap nmsk = node_map[skname];
					Skeleton3D *sk = Object::cast_to<Skeleton3D>(nmsk.node);
					ERR_FAIL_COND_V(!sk, ERR_INVALID_DATA);
					ERR_FAIL_COND_V(!skeleton_bone_map.has(sk), ERR_INVALID_DATA);
					Map<String, int> &bone_remap_map = skeleton_bone_map[sk];

					meshid = skin->base;

					if (collada.state.morph_controller_data_map.has(meshid)) {
						//it's a morph!!
						morph = &collada.state.morph_controller_data_map[meshid];
						ngsource = meshid;
						meshid = morph->mesh;
					} else {
						ngsource = "";
					}

					if (apply_mesh_xform_to_vertices) {
						apply_xform = collada.fix_transform(p_node->default_transform);
						node->set_transform(Transform3D());
					} else {
						apply_xform = Transform3D();
					}

					ERR_FAIL_COND_V(!skin->weights.sources.has("JOINT"), ERR_INVALID_DATA);

					String joint_id = skin->weights.sources["JOINT"].source;
					ERR_FAIL_COND_V(!skin->sources.has(joint_id), ERR_INVALID_DATA);

					Collada::SkinControllerData::Source *joint_src = &skin->sources[joint_id];

					bone_remap.resize(joint_src->sarray.size());

					for (int i = 0; i < bone_remap.size(); i++) {
						String str = joint_src->sarray[i];
						ERR_FAIL_COND_V(!bone_remap_map.has(str), ERR_INVALID_DATA);
						bone_remap.write[i] = bone_remap_map[str];
					}
				}

				if (collada.state.morph_controller_data_map.has(ngsource)) {
					//it's a morph!!
					morph = &collada.state.morph_controller_data_map[ngsource];
					meshid = morph->mesh;

					if (morph->targets.has("MORPH_TARGET")) {
						String target = morph->targets["MORPH_TARGET"];
						bool valid = false;
						if (morph->sources.has(target)) {
							valid = true;
							Vector<String> names = morph->sources[target].sarray;
							for (int i = 0; i < names.size(); i++) {
								String meshid2 = names[i];
								if (collada.state.mesh_data_map.has(meshid2)) {
									Ref<ImporterMesh> mesh = Ref<ImporterMesh>(memnew(ImporterMesh));
									const Collada::MeshData &meshdata = collada.state.mesh_data_map[meshid2];
									mesh->set_name(meshdata.name);
									Error err = _create_mesh_surfaces(false, mesh, ng2->material_map, meshdata, apply_xform, bone_remap, skin, nullptr, Vector<Ref<ImporterMesh>>(), false);
									ERR_FAIL_COND_V(err, err);

									morphs.push_back(mesh);
								} else {
									valid = false;
								}
							}
						}

						if (!valid) {
							morphs.clear();
						}
						ngsource = "";
					}
				}

				ERR_FAIL_COND_V_MSG(!ngsource.is_empty(), ERR_INVALID_DATA, "Controller instance source '" + ngsource + "' is neither skin or morph!");

			} else {
				meshid = ng2->source;
			}

			Ref<ImporterMesh> mesh;
			if (mesh_cache.has(meshid)) {
				mesh = mesh_cache[meshid];
			} else {
				if (collada.state.mesh_data_map.has(meshid)) {
					//bleh, must ignore invalid

					ERR_FAIL_COND_V(!collada.state.mesh_data_map.has(meshid), ERR_INVALID_DATA);
					mesh = Ref<ImporterMesh>(memnew(ImporterMesh));
					const Collada::MeshData &meshdata = collada.state.mesh_data_map[meshid];
					String name = meshdata.name;
					if (name.is_empty()) {
						name = "Mesh";
					}
					int counter = 2;
					while (mesh_unique_names.has(name)) {
						name = meshdata.name;
						if (name.is_empty()) {
							name = "Mesh";
						}
						name += itos(counter++);
					}

					mesh_unique_names.insert(name);

					mesh->set_name(name);
					Error err = _create_mesh_surfaces(morphs.size() == 0, mesh, ng2->material_map, meshdata, apply_xform, bone_remap, skin, morph, morphs, p_use_compression, use_mesh_builtin_materials);
					ERR_FAIL_COND_V_MSG(err, err, "Cannot create mesh surface.");

					mesh_cache[meshid] = mesh;
				} else {
					WARN_PRINT("Collada: Will not import geometry: " + meshid);
				}
			}

			if (!mesh.is_null()) {
				mi->set_mesh(mesh);
				if (!use_mesh_builtin_materials) {
					const Collada::MeshData &meshdata = collada.state.mesh_data_map[meshid];

					for (int i = 0; i < meshdata.primitives.size(); i++) {
						String matname = meshdata.primitives[i].material;

						if (ng2->material_map.has(matname)) {
							String target = ng2->material_map[matname].target;

							Ref<Material> material;
							if (!material_cache.has(target)) {
								Error err = _create_material(target);
								if (!err) {
									material = material_cache[target];
								}
							} else {
								material = material_cache[target];
							}

							mi->set_surface_material(i, material);
						} else if (!matname.is_empty()) {
							WARN_PRINT("Collada: Unreferenced material in geometry instance: " + matname);
						}
					}
				}
			}
		}
	}

	for (int i = 0; i < p_node->children.size(); i++) {
		Error err = _create_resources(p_node->children[i], p_use_compression);
		if (err) {
			return err;
		}
	}
	return OK;
}

Error ColladaImport::load(const String &p_path, int p_flags, bool p_force_make_tangents, bool p_use_compression) {
	Error err = collada.load(p_path, p_flags);
	ERR_FAIL_COND_V_MSG(err, err, "Cannot load file '" + p_path + "'.");

	force_make_tangents = p_force_make_tangents;
	ERR_FAIL_COND_V(!collada.state.visual_scene_map.has(collada.state.root_visual_scene), ERR_INVALID_DATA);
	Collada::VisualScene &vs = collada.state.visual_scene_map[collada.state.root_visual_scene];

	scene = memnew(Node3D); // root

	//determine what's going on with the lights
	for (int i = 0; i < vs.root_nodes.size(); i++) {
		_pre_process_lights(vs.root_nodes[i]);
	}
	//import scene

	for (int i = 0; i < vs.root_nodes.size(); i++) {
		Error err2 = _create_scene_skeletons(vs.root_nodes[i]);
		if (err2 != OK) {
			memdelete(scene);
			ERR_FAIL_COND_V(err2, err2);
		}
	}

	for (int i = 0; i < vs.root_nodes.size(); i++) {
		Error err2 = _create_scene(vs.root_nodes[i], scene);
		if (err2 != OK) {
			memdelete(scene);
			ERR_FAIL_COND_V(err2, err2);
		}

		Error err3 = _create_resources(vs.root_nodes[i], p_use_compression);
		if (err3 != OK) {
			memdelete(scene);
			ERR_FAIL_COND_V(err3, err3);
		}
	}

	//optatively, set unit scale in the root
	scene->set_transform(collada.get_root_transform());

	return OK;
}

void ColladaImport::_fix_param_animation_tracks() {
	for (KeyValue<String, Collada::Node *> &E : collada.state.scene_map) {
		Collada::Node *n = E.value;
		switch (n->type) {
			case Collada::Node::TYPE_NODE: {
				// ? do nothing
			} break;
			case Collada::Node::TYPE_JOINT: {
			} break;
			case Collada::Node::TYPE_SKELETON: {
			} break;
			case Collada::Node::TYPE_LIGHT: {
			} break;
			case Collada::Node::TYPE_CAMERA: {
			} break;
			case Collada::Node::TYPE_GEOMETRY: {
				Collada::NodeGeometry *ng = static_cast<Collada::NodeGeometry *>(n);
				// test source(s)
				String source = ng->source;

				while (!source.is_empty()) {
					if (collada.state.skin_controller_data_map.has(source)) {
						const Collada::SkinControllerData &skin = collada.state.skin_controller_data_map[source];

						//nothing to animate here i think

						source = skin.base;
					} else if (collada.state.morph_controller_data_map.has(source)) {
						const Collada::MorphControllerData &morph = collada.state.morph_controller_data_map[source];

						if (morph.targets.has("MORPH_WEIGHT") && morph.targets.has("MORPH_TARGET")) {
							String weights = morph.targets["MORPH_WEIGHT"];
							String targets = morph.targets["MORPH_TARGET"];
							//fails here

							if (morph.sources.has(targets) && morph.sources.has(weights)) {
								const Collada::MorphControllerData::Source &weight_src = morph.sources[weights];
								const Collada::MorphControllerData::Source &target_src = morph.sources[targets];

								ERR_FAIL_COND(weight_src.array.size() != target_src.sarray.size());

								for (int i = 0; i < weight_src.array.size(); i++) {
									String track_name = weights + "(" + itos(i) + ")";
									String mesh_name = target_src.sarray[i];
									if (collada.state.mesh_name_map.has(mesh_name) && collada.state.referenced_tracks.has(track_name)) {
										const Vector<int> &rt = collada.state.referenced_tracks[track_name];

										for (int rti = 0; rti < rt.size(); rti++) {
											Collada::AnimationTrack *at = &collada.state.animation_tracks.write[rt[rti]];

											at->target = E.key;
											at->param = "morph/" + collada.state.mesh_name_map[mesh_name];
											at->property = true;
											//at->param
										}
									}
								}
							}
						}
						source = morph.mesh;
					} else {
						source = ""; // for now nothing else supported
					}
				}

			} break;
		}
	}
}

void ColladaImport::create_animations(bool p_import_value_tracks) {
	_fix_param_animation_tracks();
	for (int i = 0; i < collada.state.animation_clips.size(); i++) {
		for (int j = 0; j < collada.state.animation_clips[i].tracks.size(); j++) {
			tracks_in_clips.insert(collada.state.animation_clips[i].tracks[j]);
		}
	}

	for (int i = 0; i < collada.state.animation_tracks.size(); i++) {
		const Collada::AnimationTrack &at = collada.state.animation_tracks[i];

		String node;

		if (!node_map.has(at.target)) {
			if (node_name_map.has(at.target)) {
				node = node_name_map[at.target];
			} else {
				WARN_PRINT("Collada: Couldn't find node: " + at.target);
				continue;
			}
		} else {
			node = at.target;
		}

		if (at.property) {
			valid_animated_properties.push_back(i);

		} else {
			node_map[node].anim_tracks.push_back(i);
			valid_animated_nodes.insert(node);
		}
	}

	create_animation(-1, p_import_value_tracks);
	for (int i = 0; i < collada.state.animation_clips.size(); i++) {
		create_animation(i, p_import_value_tracks);
	}
}

void ColladaImport::create_animation(int p_clip, bool p_import_value_tracks) {
	Ref<Animation> animation = Ref<Animation>(memnew(Animation));

	if (p_clip == -1) {
		animation->set_name("default");
	} else {
		animation->set_name(collada.state.animation_clips[p_clip].name);
	}

	for (const KeyValue<String, NodeMap> &E : node_map) {
		if (E.value.bone < 0) {
			continue;
		}
		bones_with_animation[E.key] = false;
	}
	//store and validate tracks

	if (p_clip == -1) {
		//main anim
	}

	Set<int> track_filter;

	if (p_clip == -1) {
		for (int i = 0; i < collada.state.animation_clips.size(); i++) {
			int tc = collada.state.animation_clips[i].tracks.size();
			for (int j = 0; j < tc; j++) {
				String n = collada.state.animation_clips[i].tracks[j];
				if (collada.state.by_id_tracks.has(n)) {
					const Vector<int> &ti = collada.state.by_id_tracks[n];
					for (int k = 0; k < ti.size(); k++) {
						track_filter.insert(ti[k]);
					}
				}
			}
		}
	} else {
		int tc = collada.state.animation_clips[p_clip].tracks.size();
		for (int j = 0; j < tc; j++) {
			String n = collada.state.animation_clips[p_clip].tracks[j];
			if (collada.state.by_id_tracks.has(n)) {
				const Vector<int> &ti = collada.state.by_id_tracks[n];
				for (int k = 0; k < ti.size(); k++) {
					track_filter.insert(ti[k]);
				}
			}
		}
	}

	//animation->set_loop(true);
	//create animation tracks

	Vector<real_t> base_snapshots;

	float f = 0;
	float snapshot_interval = 1.0 / bake_fps; //should be customizable somewhere...

	float anim_length = collada.state.animation_length;
	if (p_clip >= 0 && collada.state.animation_clips[p_clip].end) {
		anim_length = collada.state.animation_clips[p_clip].end;
	}

	while (f < anim_length) {
		base_snapshots.push_back(f);

		f += snapshot_interval;

		if (f >= anim_length) {
			base_snapshots.push_back(anim_length);
		}
	}

	animation->set_length(anim_length);

	bool tracks_found = false;

	for (Set<String>::Element *E = valid_animated_nodes.front(); E; E = E->next()) {
		// take snapshots

		if (!collada.state.scene_map.has(E->get())) {
			continue;
		}

		NodeMap &nm = node_map[E->get()];
		String path = scene->get_path_to(nm.node);

		if (nm.bone >= 0) {
			Skeleton3D *sk = static_cast<Skeleton3D *>(nm.node);
			String name = sk->get_bone_name(nm.bone);
			path = path + ":" + name;
		}

		bool found_anim = false;

		Collada::Node *cn = collada.state.scene_map[E->get()];
		if (cn->ignore_anim) {
			continue;
		}

		bool has_position = false;
		bool has_rotation = false;
		bool has_scale = false;

		for (int i = 0; cn->xform_list.size(); i++) {
			switch (cn->xform_list[i].op) {
				case Collada::Node::XForm::OP_ROTATE: {
					has_rotation = true;
				} break;
				case Collada::Node::XForm::OP_SCALE: {
					has_scale = true;
				} break;
				case Collada::Node::XForm::OP_TRANSLATE: {
					has_position = true;
				} break;
				case Collada::Node::XForm::OP_MATRIX: {
					has_position = true;
					has_rotation = true;
					has_scale = true;
				} break;
				case Collada::Node::XForm::OP_VISIBILITY: {
				} break;
			}
		}

		int base_track = animation->get_track_count();
		int position_idx = -1;
		if (has_position) {
			position_idx = animation->get_track_count();
			animation->add_track(Animation::TYPE_POSITION_3D);
			animation->track_set_path(position_idx, path);
			animation->track_set_imported(position_idx, true); //helps merging later
		}

		int rotation_idx = -1;
		if (has_rotation) {
			rotation_idx = animation->get_track_count();
			animation->add_track(Animation::TYPE_ROTATION_3D);
			animation->track_set_path(rotation_idx, path);
			animation->track_set_imported(rotation_idx, true); //helps merging later
		}

		int scale_idx = -1;
		if (has_scale) {
			scale_idx = animation->get_track_count();
			animation->add_track(Animation::TYPE_SCALE_3D);
			animation->track_set_path(scale_idx, path);
			animation->track_set_imported(scale_idx, true); //helps merging later
		}

		Vector<real_t> snapshots = base_snapshots;

		if (nm.anim_tracks.size() == 1) {
			//use snapshot keys from anim track instead, because this was most likely exported baked
			const Collada::AnimationTrack &at = collada.state.animation_tracks[nm.anim_tracks.front()->get()];
			snapshots.clear();
			for (int i = 0; i < at.keys.size(); i++) {
				snapshots.push_back(at.keys[i].time);
			}
		}

		for (int i = 0; i < snapshots.size(); i++) {
			for (List<int>::Element *ET = nm.anim_tracks.front(); ET; ET = ET->next()) {
				//apply tracks

				if (p_clip == -1) {
					if (track_filter.has(ET->get())) {
						continue;
					}
				} else {
					if (!track_filter.has(ET->get())) {
						continue;
					}
				}

				found_anim = true;

				const Collada::AnimationTrack &at = collada.state.animation_tracks[ET->get()];

				int xform_idx = -1;
				for (int j = 0; j < cn->xform_list.size(); j++) {
					if (cn->xform_list[j].id == at.param) {
						xform_idx = j;
						break;
					}
				}

				if (xform_idx == -1) {
					WARN_PRINT("Collada: Couldn't find matching node " + at.target + " xform for track " + at.param + ".");
					continue;
				}

				Vector<float> data = at.get_value_at_time(snapshots[i]);
				ERR_CONTINUE(data.is_empty());

				Collada::Node::XForm &xf = cn->xform_list.write[xform_idx];

				if (at.component == "ANGLE") {
					ERR_CONTINUE(data.size() != 1);
					ERR_CONTINUE(xf.op != Collada::Node::XForm::OP_ROTATE);
					ERR_CONTINUE(xf.data.size() < 4);
					xf.data.write[3] = data[0];
				} else if (at.component == "X" || at.component == "Y" || at.component == "Z") {
					int cn2 = at.component[0] - 'X';
					ERR_CONTINUE(cn2 >= xf.data.size());
					ERR_CONTINUE(data.size() > 1);
					xf.data.write[cn2] = data[0];
				} else if (data.size() == xf.data.size()) {
					xf.data = data;
				} else {
					ERR_CONTINUE_MSG(data.size() != xf.data.size(), "Component " + at.component + " has datasize " + itos(data.size()) + ", xfdatasize " + itos(xf.data.size()) + ".");
				}
			}

			Transform3D xform = cn->compute_transform(collada);
			xform = collada.fix_transform(xform) * cn->post_transform;

			Vector3 s = xform.basis.get_scale();
			bool singular_matrix = Math::is_zero_approx(s.x) || Math::is_zero_approx(s.y) || Math::is_zero_approx(s.z);
			Quaternion q = singular_matrix ? Quaternion() : xform.basis.get_rotation_quaternion();
			Vector3 l = xform.origin;

			if (position_idx >= 0) {
				animation->position_track_insert_key(position_idx, snapshots[i], l);
			}
			if (rotation_idx >= 0) {
				animation->rotation_track_insert_key(rotation_idx, snapshots[i], q);
			}
			if (scale_idx >= 0) {
				animation->scale_track_insert_key(scale_idx, snapshots[i], s);
			}
		}

		if (nm.bone >= 0) {
			if (found_anim) {
				bones_with_animation[E->get()] = true;
			}
		}

		if (found_anim) {
			tracks_found = true;
		} else {
			if (position_idx >= 0) {
				animation->remove_track(base_track);
			}
			if (rotation_idx >= 0) {
				animation->remove_track(base_track);
			}
			if (scale_idx >= 0) {
				animation->remove_track(base_track);
			}
		}
	}

	if (p_import_value_tracks) {
		for (int i = 0; i < valid_animated_properties.size(); i++) {
			int ti = valid_animated_properties[i];

			if (p_clip == -1) {
				if (track_filter.has(ti)) {
					continue;
				}
			} else {
				if (!track_filter.has(ti)) {
					continue;
				}
			}

			const Collada::AnimationTrack &at = collada.state.animation_tracks[ti];

			// take snapshots
			if (!collada.state.scene_map.has(at.target)) {
				continue;
			}

			NodeMap &nm = node_map[at.target];
			String path = scene->get_path_to(nm.node);

			animation->add_track(Animation::TYPE_BLEND_SHAPE);
			int track = animation->get_track_count() - 1;

			path = path + ":" + at.param;
			animation->track_set_path(track, path);
			animation->track_set_imported(track, true); //helps merging later

			for (int j = 0; j < at.keys.size(); j++) {
				float time = at.keys[j].time;
				Variant value;
				Vector<float> data = at.keys[j].data;
				if (data.size() == 1) {
					//push a float
					value = data[0];

				} else if (data.size() == 16) {
					//matrix
					WARN_PRINT("Collada: Value keys for matrices not supported.");
				} else {
					WARN_PRINT("Collada: Unexpected amount of value keys: " + itos(data.size()));
				}

				animation->blend_shape_track_insert_key(track, time, value);
			}

			tracks_found = true;
		}
	}

	if (tracks_found) {
		animations.push_back(animation);
	}
}

/*********************************************************************************/
/*************************************** SCENE ***********************************/
/*********************************************************************************/

uint32_t EditorSceneFormatImporterCollada::get_import_flags() const {
	return IMPORT_SCENE | IMPORT_ANIMATION;
}

void EditorSceneFormatImporterCollada::get_extensions(List<String> *r_extensions) const {
	r_extensions->push_back("dae");
}

Node *EditorSceneFormatImporterCollada::import_scene(const String &p_path, uint32_t p_flags, const Map<StringName, Variant> &p_options, int p_bake_fps, List<String> *r_missing_deps, Error *r_err) {
	if (r_err) {
		*r_err = OK;
	}
	ColladaImport state;
	uint32_t flags = Collada::IMPORT_FLAG_SCENE;
	if (p_flags & IMPORT_ANIMATION) {
		flags |= Collada::IMPORT_FLAG_ANIMATION;
	}

	state.use_mesh_builtin_materials = true;
	state.bake_fps = p_bake_fps;

	Error err = state.load(p_path, flags, p_flags & EditorSceneFormatImporter::IMPORT_GENERATE_TANGENT_ARRAYS, false);

	if (r_err) {
		*r_err = err;
	}

	ERR_FAIL_COND_V_MSG(err != OK, nullptr, "Cannot load scene from file '" + p_path + "'.");

	if (state.missing_textures.size()) {
		/*
	for(int i=0;i<state.missing_textures.size();i++) {
		EditorNode::add_io_error("Texture Not Found: "+state.missing_textures[i]);
	}
	*/

		if (r_missing_deps) {
			for (int i = 0; i < state.missing_textures.size(); i++) {
				//EditorNode::add_io_error("Texture Not Found: "+state.missing_textures[i]);
				r_missing_deps->push_back(state.missing_textures[i]);
			}
		}
	}

	if (p_flags & IMPORT_ANIMATION) {
		state.create_animations(true);
		AnimationPlayer *ap = memnew(AnimationPlayer);
		for (int i = 0; i < state.animations.size(); i++) {
			String name;
			if (state.animations[i]->get_name().is_empty()) {
				name = "default";
			} else {
				name = state.animations[i]->get_name();
			}

			ap->add_animation(name, state.animations[i]);
		}
		state.scene->add_child(ap, true);
		ap->set_owner(state.scene);
	}

	return state.scene;
}

Ref<Animation> EditorSceneFormatImporterCollada::import_animation(const String &p_path, uint32_t p_flags, const Map<StringName, Variant> &p_options, int p_bake_fps) {
	ColladaImport state;

	state.use_mesh_builtin_materials = false;

	Error err = state.load(p_path, Collada::IMPORT_FLAG_ANIMATION, p_flags & EditorSceneFormatImporter::IMPORT_GENERATE_TANGENT_ARRAYS);
	ERR_FAIL_COND_V_MSG(err != OK, RES(), "Cannot load animation from file '" + p_path + "'.");

	state.create_animations(true);
	if (state.scene) {
		memdelete(state.scene);
	}

	if (state.animations.size() == 0) {
		return Ref<Animation>();
	}
	Ref<Animation> anim = state.animations[0];

	return anim;
}

EditorSceneFormatImporterCollada::EditorSceneFormatImporterCollada() {
}