from abc import ABCMeta, abstractmethod
from six import add_metaclass

@add_metaclass(ABCMeta)
class RegistryDataInterface(object):
  """ Interface for code to work with the registry data model. The registry data model consists
      of all tables that store registry-specific information, such as Manifests, Blobs, Images,
      and Labels.
  """

  @abstractmethod
  def find_matching_tag(self, repository_ref, tag_names):
    """ Finds an alive tag in the repository matching one of the given tag names and returns it
        or None if none.
    """

  @abstractmethod
  def get_most_recent_tag(self, repository_ref):
    """ Returns the most recently pushed alive tag in the repository, if any. If none, returns
        None.
    """

  @abstractmethod
  def lookup_repository(self, namespace_name, repo_name, kind_filter=None):
    """ Looks up and returns a reference to the repository with the given namespace and name,
        or None if none. """

  @abstractmethod
  def get_manifest_for_tag(self, tag, backfill_if_necessary=False):
    """ Returns the manifest associated with the given tag. """

  @abstractmethod
  def lookup_manifest_by_digest(self, repository_ref, manifest_digest, allow_dead=False,
                                include_legacy_image=False):
    """ Looks up the manifest with the given digest under the given repository and returns it
        or None if none. """

  @abstractmethod
  def get_legacy_images(self, repository_ref):
    """
    Returns an iterator of all the LegacyImage's defined in the matching repository.
    """

  @abstractmethod
  def get_legacy_image(self, repository_ref, docker_image_id, include_parents=False):
    """
    Returns the matching LegacyImages under the matching repository, if any. If none,
    returns None.
    """

  @abstractmethod
  def create_manifest_label(self, manifest, key, value, source_type_name, media_type_name=None):
    """ Creates a label on the manifest with the given key and value.

        Can raise InvalidLabelKeyException or InvalidMediaTypeException depending
        on the validation errors.
    """

  @abstractmethod
  def list_manifest_labels(self, manifest, key_prefix=None):
    """ Returns all labels found on the manifest. If specified, the key_prefix will filter the
        labels returned to those keys that start with the given prefix.
    """

  @abstractmethod
  def get_manifest_label(self, manifest, label_uuid):
    """ Returns the label with the specified UUID on the manifest or None if none. """

  @abstractmethod
  def delete_manifest_label(self, manifest, label_uuid):
    """ Delete the label with the specified UUID on the manifest. Returns the label deleted
        or None if none.
    """

  @abstractmethod
  def list_repository_tags(self, repository_ref, include_legacy_images=False):
    """
    Returns a list of all the active tags in the repository. Note that this can be a *heavy*
    operation on repositories with a lot of tags, and should be avoided for more targetted
    operations wherever possible.
    """

  @abstractmethod
  def list_repository_tag_history(self, repository_ref, page=1, size=100, specific_tag_name=None):
    """
    Returns the history of all tags in the repository (unless filtered). This includes tags that
    have been made in-active due to newer versions of those tags coming into service.
    """

  @abstractmethod
  def get_repo_tag(self, repository_ref, tag_name, include_legacy_image=False):
    """
    Returns the latest, *active* tag found in the repository, with the matching name
    or None if none.
    """

  @abstractmethod
  def retarget_tag(self, repository_ref, tag_name, manifest_or_legacy_image,
                   is_reversion=False):
    """
    Creates, updates or moves a tag to a new entry in history, pointing to the manifest or
    legacy image specified. If is_reversion is set to True, this operation is considered a
    reversion over a previous tag move operation. Returns the updated Tag or None on error.
    """

  @abstractmethod
  def delete_tag(self, repository_ref, tag_name):
    """
    Deletes the latest, *active* tag with the given name in the repository.
    """

  @abstractmethod
  def change_repository_tag_expiration(self, tag, expiration_date):
    """ Sets the expiration date of the tag under the matching repository to that given. If the
        expiration date is None, then the tag will not expire. Returns a tuple of the previous
        expiration timestamp in seconds (if any), and whether the operation succeeded.
    """

  @abstractmethod
  def get_legacy_images_owned_by_tag(self, tag):
    """ Returns all legacy images *solely owned and used* by the given tag. """

  @abstractmethod
  def get_security_status(self, manifest_or_legacy_image):
    """ Returns the security status for the given manifest or legacy image or None if none. """

  @abstractmethod
  def backfill_manifest_for_tag(self, tag):
    """ Backfills a manifest for the V1 tag specified.
        If a manifest already exists for the tag, returns that manifest.

        NOTE: This method will only be necessary until we've completed the backfill, at which point
        it should be removed.
    """

  @abstractmethod
  def is_namespace_enabled(self, namespace_name):
    """ Returns whether the given namespace exists and is enabled. """

  @abstractmethod
  def list_manifest_layers(self, manifest, include_placements=False):
    """ Returns an *ordered list* of the layers found in the manifest, starting at the base and
        working towards the leaf, including the associated Blob and its placements (if specified).
        Returns None if the manifest could not be parsed and validated.
    """

  @abstractmethod
  def lookup_derived_image(self, manifest, verb, varying_metadata=None, include_placements=False):
    """
    Looks up the derived image for the given manifest, verb and optional varying metadata and
    returns it or None if none.
    """

  @abstractmethod
  def lookup_or_create_derived_image(self, manifest, verb, storage_location, varying_metadata=None,
                                     include_placements=False):
    """
    Looks up the derived image for the given maniest, verb and optional varying metadata
    and returns it. If none exists, a new derived image is created.
    """

  @abstractmethod
  def get_derived_image_signature(self, derived_image, signer_name):
    """
    Returns the signature associated with the derived image and a specific signer or None if none.
    """

  @abstractmethod
  def set_derived_image_signature(self, derived_image, signer_name, signature):
    """
    Sets the calculated signature for the given derived image and signer to that specified.
    """

  @abstractmethod
  def delete_derived_image(self, derived_image):
    """
    Deletes a derived image and all of its storage.
    """

  @abstractmethod
  def set_derived_image_size(self, derived_image, compressed_size):
    """
    Sets the compressed size on the given derived image.
    """

  @abstractmethod
  def get_torrent_info(self, blob):
    """
    Returns the torrent information associated with the given blob or None if none.
    """

  @abstractmethod
  def set_torrent_info(self, blob, piece_length, pieces):
    """
    Sets the torrent infomation associated with the given blob to that specified.
    """

  @abstractmethod
  def get_repo_blob_by_digest(self, repo_ref, blob_digest, include_placements=False):
    """
    Returns the blob in the repository with the given digest, if any or None if none. Note that
    there may be multiple records in the same repository for the same blob digest, so the return
    value of this function may change.
    """