import logging

from functools import wraps

from flask import abort

from data import model


logger = logging.getLogger(__name__)


def _raise_unauthorized(repository, scopes):
  raise StandardError("Unauthorized acces to %s", repository)


def _get_reponame_kwargs(*args, **kwargs):
  return [kwargs['namespace'], kwargs['package_name']]


def disallow_for_image_repository(get_reponame_method=_get_reponame_kwargs):
  def wrapper(func):
    @wraps(func)
    def wrapped(*args, **kwargs):
      namespace_name, repo_name = get_reponame_method(*args, **kwargs)
      image_repo = model.repository.get_repository(namespace_name, repo_name, kind_filter='image')
      if image_repo is not None:
        logger.debug('Tried to invoked a CNR method on an image repository')
        abort(501)
      return func(*args, **kwargs)
    return wrapped
  return wrapper


def require_repo_permission(permission_class, scopes=None, allow_public=False,
                            raise_method=_raise_unauthorized,
                            get_reponame_method=_get_reponame_kwargs):
  def wrapper(func):
    @wraps(func)
    @disallow_for_image_repository(get_reponame_method=get_reponame_method)
    def wrapped(*args, **kwargs):
      namespace_name, repo_name = get_reponame_method(*args, **kwargs)
      logger.debug('Checking permission %s for repo: %s/%s', permission_class,
                   namespace_name, repo_name)
      permission = permission_class(namespace_name, repo_name)
      if (permission.can() or
          (allow_public and
           model.repository.repository_is_public(namespace_name, repo_name))):
        return func(*args, **kwargs)
      repository = namespace_name + '/' + repo_name
      raise_method(repository, scopes)
    return wrapped
  return wrapper