text: import datetime
  from pathlib import Path
  from typing import Any, Dict, Iterator, List, Optional
  from xml.etree.ElementTree import Element, SubElement, tostring
  
  import deprecation
  
  import darwin.datatypes as dt
  from darwin.version import __version__
  
  DEPRECATION_MESSAGE = """
  
  This function is going to be turned into private. This means that breaking 
  changes in its interface and implementation are to be expected. We encourage using ``export`` 
  instead of calling this low-level function directly.
  
  """
  
  
  def export(annotation_files: Iterator[dt.AnnotationFile], output_dir: Path) -> None:
      """
      Exports the given ``AnnotationFile``s into the cvat format inside of the given ``output_dir``.
  
      Parameters
      ----------
      annotation_files : Iterator[dt.AnnotationFile]
          The ``AnnotationFile``\\s to be exported.
      output_dir : Path
          The folder where the new cvat file will be.
      """
      output = _build_xml(list(annotation_files))
      # TODO, maybe an optional output name (like the dataset name if available)
      output_file_path = (output_dir / "output").with_suffix(".xml")
      with open(output_file_path, "wb") as f:
          f.write(tostring(output))
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def add_subelement_text(parent: Element, name: str, value: Any) -> Element:
      sub = SubElement(parent, name)
      sub.text = str(value)
      return sub
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_xml(annotation_files: List[dt.AnnotationFile]) -> Element:
      label_lookup: Dict[str, int] = build_label_lookup(annotation_files)
      root: Element = Element("annotations")
      add_subelement_text(root, "version", "1.1")
      build_meta(root, annotation_files, label_lookup)
      build_images(root, annotation_files, label_lookup)
      return root
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_images(root: Element, annotation_files: List[dt.AnnotationFile], label_lookup: Dict[str, int]) -> None:
      for id, annotation_file in enumerate(annotation_files, 1):
          image = SubElement(root, "image")
          image.attrib["id"] = str(id)
          image.attrib["name"] = annotation_file.filename
          image.attrib["width"] = str(annotation_file.image_width)
          image.attrib["height"] = str(annotation_file.image_height)
  
          for annotation in annotation_file.annotations:
              build_annotation(image, annotation)
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_annotation(image: Element, annotation: dt.Annotation) -> None:
      if annotation.annotation_class.annotation_type == "bounding_box":
          box = SubElement(image, "box")
          box.attrib["label"] = annotation.annotation_class.name
          box.attrib["xtl"] = str(annotation.data["x"])
          box.attrib["ytl"] = str(annotation.data["y"])
          box.attrib["xbr"] = str(annotation.data["x"] + annotation.data["w"])
          box.attrib["ybr"] = str(annotation.data["y"] + annotation.data["h"])
          box.attrib["occluded"] = "0"
          build_attributes(box, annotation)
      else:
          print(f"[warning] skipping {annotation.annotation_class.annotation_type}")
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_attributes(box: Element, annotation: dt.Annotation) -> None:
      annotation_text: Optional[dt.SubAnnotation] = annotation.get_sub("text")
      if annotation_text:
          attribute = add_subelement_text(box, "attribute", annotation_text.data)
          attribute.attrib["name"] = "__text"
  
      annotation_instance_id: Optional[dt.SubAnnotation] = annotation.get_sub("instance_id")
      if annotation_instance_id:
          attribute = add_subelement_text(box, "attribute", str(annotation_instance_id.data))
          attribute.attrib["name"] = "__instance_id"
  
      annotation_attributes: Optional[dt.SubAnnotation] = annotation.get_sub("attributes")
      if annotation_attributes:
          for attrib in annotation_attributes.data:
              attribute = add_subelement_text(box, "attribute", "")
              attribute.attrib["name"] = attrib
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_meta(root: Element, annotation_files: List[dt.AnnotationFile], label_lookup: Dict[str, int]) -> None:
      meta: Element = SubElement(root, "meta")
      add_subelement_text(meta, "dumped", str(datetime.datetime.now(tz=datetime.timezone.utc)))
  
      task: Element = SubElement(meta, "task")
      add_subelement_text(task, "id", 1)
      add_subelement_text(task, "name", "exported_task_from_darwin")
      add_subelement_text(task, "size", len(annotation_files))
      add_subelement_text(task, "mode", "annotation")
      add_subelement_text(task, "overlapp", 0)
      add_subelement_text(task, "bugtracker", None)
      add_subelement_text(task, "flipped", False)
      add_subelement_text(task, "created", str(datetime.datetime.now(tz=datetime.timezone.utc)))
      add_subelement_text(task, "updated", str(datetime.datetime.now(tz=datetime.timezone.utc)))
  
      labels: Element = SubElement(task, "labels")
      build_labels(labels, label_lookup)
  
      segments: Element = SubElement(task, "segments")
      build_segments(segments, annotation_files)
  
      owner: Element = SubElement(task, "owner")
      add_subelement_text(owner, "username", "example_username")
      add_subelement_text(owner, "email", "user@example.com")
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_segments(segments: Element, annotation_files: List[dt.AnnotationFile]) -> None:
      segment: Element = SubElement(segments, "segment")
      add_subelement_text(segment, "id", 1)
      add_subelement_text(segment, "start", 1)
      add_subelement_text(segment, "end", len(annotation_files))
      add_subelement_text(segment, "url", "not applicable")
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_labels(labels: Element, label_lookup: Dict[str, int]) -> None:
      for key in label_lookup.keys():
          label: Element = SubElement(labels, "label")
          add_subelement_text(label, "name", key)
          SubElement(label, "attributes")
  
  
  @deprecation.deprecated(
      deprecated_in="0.7.7",
      removed_in="0.8.0",
      current_version=__version__,
      details=DEPRECATION_MESSAGE,
  )
  def build_label_lookup(annotation_files: List[dt.AnnotationFile]) -> Dict[str, int]:
      labels: Dict[str, int] = {}
      for annotation_file in annotation_files:
          for annotation_class in annotation_file.annotation_classes:
              if annotation_class.name not in labels and annotation_class.annotation_type == "bounding_box":
                  labels[annotation_class.name] = len(labels)
      return labels
  
  
  def _add_subelement_text(parent: Element, name: str, value: Any) -> Element:
      sub = SubElement(parent, name)
      sub.text = str(value)
      return sub
  
  
  def _build_xml(annotation_files: List[dt.AnnotationFile]) -> Element:
      label_lookup: Dict[str, int] = _build_label_lookup(annotation_files)
      root: Element = Element("annotations")
      _add_subelement_text(root, "version", "1.1")
      _build_meta(root, annotation_files, label_lookup)
      _build_images(root, annotation_files, label_lookup)
      return root
  
  
  def _build_images(root: Element, annotation_files: List[dt.AnnotationFile], label_lookup: Dict[str, int]) -> None:
      for id, annotation_file in enumerate(annotation_files, 1):
          image = SubElement(root, "image")
          image.attrib["id"] = str(id)
          image.attrib["name"] = annotation_file.filename
          image.attrib["width"] = str(annotation_file.image_width)
          image.attrib["height"] = str(annotation_file.image_height)
  
          for annotation in annotation_file.annotations:
              _build_annotation(image, annotation)
  
  
  def _build_annotation(image: Element, annotation: dt.Annotation) -> None:
      if annotation.annotation_class.annotation_type == "bounding_box":
          box = SubElement(image, "box")
          box.attrib["label"] = annotation.annotation_class.name
          box.attrib["xtl"] = str(annotation.data["x"])
          box.attrib["ytl"] = str(annotation.data["y"])
          box.attrib["xbr"] = str(annotation.data["x"] + annotation.data["w"])
          box.attrib["ybr"] = str(annotation.data["y"] + annotation.data["h"])
          box.attrib["occluded"] = "0"
          _build_attributes(box, annotation)
      else:
          print(f"[warning] skipping {annotation.annotation_class.annotation_type}")
  
  
  def _build_attributes(box: Element, annotation: dt.Annotation) -> None:
      annotation_text: Optional[dt.SubAnnotation] = annotation.get_sub("text")
      if annotation_text:
          attribute = _add_subelement_text(box, "attribute", annotation_text.data)
          attribute.attrib["name"] = "__text"
  
      annotation_instance_id: Optional[dt.SubAnnotation] = annotation.get_sub("instance_id")
      if annotation_instance_id:
          attribute = _add_subelement_text(box, "attribute", str(annotation_instance_id.data))
          attribute.attrib["name"] = "__instance_id"
  
      annotation_attributes: Optional[dt.SubAnnotation] = annotation.get_sub("attributes")
      if annotation_attributes:
          for attrib in annotation_attributes.data:
              attribute = _add_subelement_text(box, "attribute", "")
              attribute.attrib["name"] = attrib
  
  
  def _build_meta(root: Element, annotation_files: List[dt.AnnotationFile], label_lookup: Dict[str, int]) -> None:
      meta: Element = SubElement(root, "meta")
      _add_subelement_text(meta, "dumped", str(datetime.datetime.now(tz=datetime.timezone.utc)))
  
      task: Element = SubElement(meta, "task")
      _add_subelement_text(task, "id", 1)
      _add_subelement_text(task, "name", "exported_task_from_darwin")
      _add_subelement_text(task, "size", len(annotation_files))
      _add_subelement_text(task, "mode", "annotation")
      _add_subelement_text(task, "overlapp", 0)
      _add_subelement_text(task, "bugtracker", None)
      _add_subelement_text(task, "flipped", False)
      _add_subelement_text(task, "created", str(datetime.datetime.now(tz=datetime.timezone.utc)))
      _add_subelement_text(task, "updated", str(datetime.datetime.now(tz=datetime.timezone.utc)))
  
      labels: Element = SubElement(task, "labels")
      _build_labels(labels, label_lookup)
  
      segments: Element = SubElement(task, "segments")
      _build_segments(segments, annotation_files)
  
      owner: Element = SubElement(task, "owner")
      _add_subelement_text(owner, "username", "example_username")
      _add_subelement_text(owner, "email", "user@example.com")
  
  
  def _build_segments(segments: Element, annotation_files: List[dt.AnnotationFile]) -> None:
      segment: Element = SubElement(segments, "segment")
      _add_subelement_text(segment, "id", 1)
      _add_subelement_text(segment, "start", 1)
      _add_subelement_text(segment, "end", len(annotation_files))
      _add_subelement_text(segment, "url", "not applicable")
  
  
  def _build_labels(labels: Element, label_lookup: Dict[str, int]) -> None:
      for key in label_lookup.keys():
          label: Element = SubElement(labels, "label")
          _add_subelement_text(label, "name", key)
          SubElement(label, "attributes")
  
  
  def _build_label_lookup(annotation_files: List[dt.AnnotationFile]) -> Dict[str, int]:
      labels: Dict[str, int] = {}
      for annotation_file in annotation_files:
          for annotation_class in annotation_file.annotation_classes:
              if annotation_class.name not in labels and annotation_class.annotation_type == "bounding_box":
                  labels[annotation_class.name] = len(labels)
      return labels
  