from data import model
from data.registry_model.interface import RegistryDataInterface
from data.registry_model.datatypes import Tag


class PreOCIModel(RegistryDataInterface):
  """
  PreOCIModel implements the data model for the registry API using a database schema
  before it was changed to support the OCI specification.
  """

  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.
    """
    found_tag = model.tag.find_matching_tag(repository_ref.repo_id, tag_names)
    return Tag.for_repository_tag(found_tag)

  def get_most_recent_tag(self, repository_ref):
    """ Returns the most recently pushed alive tag in the repository, if any. If none, returns
        None.
    """
    found_tag = model.tag.get_most_recent_tag(repository_ref.repo_id)
    return Tag.for_repository_tag(found_tag)


pre_oci_model = PreOCIModel()