from abc import ABCMeta, abstractproperty
from six import add_metaclass

@add_metaclass(ABCMeta)
class ManifestInterface(object):
  """ Defines the interface for the various manifests types supported. """
  @abstractproperty
  def digest(self):
    """ The digest of the manifest, including type prefix. """
    pass

  @abstractproperty
  def media_type(self):
    """ The media type of the schema. """
    pass

  @abstractproperty
  def manifest_dict(self):
    """ Returns the manifest as a dictionary ready to be serialized to JSON. """
    pass

  @abstractproperty
  def bytes(self):
    """ Returns the bytes of the manifest. """
    pass

  @abstractproperty
  def layers(self):
    """ Returns the layers of this manifest, from base to leaf. """
    pass

  @abstractproperty
  def leaf_layer_v1_image_id(self):
    """ Returns the Docker V1 image ID for the leaf (top) layer, if any, or None if none. """
    pass

  @abstractproperty
  def blob_digests(self):
    """ Returns an iterator over all the blob digests referenced by this manifest,
        from base to leaf. The blob digests are strings with prefixes.
    """