""" List and manage repository vulnerabilities and other security information. """

import logging
import features

from app import secscan_api
from data import model
from endpoints.api import (require_repo_read, path_param,
                           RepositoryParamResource, resource, nickname, show_if, parse_args,
                           query_param, truthy_bool, disallow_for_app_repositories)
from endpoints.exception import NotFound, DownstreamIssue
from endpoints.api.manifest import MANIFEST_DIGEST_ROUTE
from util.secscan.api import APIRequestFailure


logger = logging.getLogger(__name__)


class SCAN_STATUS(object):
  """ Security scan status enum """
  SCANNED = 'scanned'
  FAILED = 'failed'
  QUEUED = 'queued'


def _get_status(repo_image):
  """ Returns the SCAN_STATUS value for the given image. """
  if repo_image.security_indexed_engine is not None and repo_image.security_indexed_engine >= 0:
    return SCAN_STATUS.SCANNED if repo_image.security_indexed else SCAN_STATUS.FAILED

  return SCAN_STATUS.QUEUED

def _security_status_for_image(namespace, repository, repo_image, include_vulnerabilities=True):
  """ Returns a dict representing the result of a call to the security status API for the given
      image.
  """
  if not repo_image.security_indexed:
    logger.debug('Image %s under repository %s/%s not security indexed',
                 repo_image.docker_image_id, namespace, repository)
    return {
      'status': _get_status(repo_image),
    }

  try:
    if include_vulnerabilities:
      data = secscan_api.get_layer_data(repo_image, include_vulnerabilities=True)
    else:
      data = secscan_api.get_layer_data(repo_image, include_features=True)
  except APIRequestFailure as arf:
    raise DownstreamIssue(arf.message)

  if data is None:
    raise NotFound()

  return {
    'status': _get_status(repo_image),
    'data': data,
  }


@resource('/v1/repository/<apirepopath:repository>/image/<imageid>/security')
@show_if(features.SECURITY_SCANNER)
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('imageid', 'The image ID')
class RepositoryImageSecurity(RepositoryParamResource):
  """ Operations for managing the vulnerabilities in a repository image. """

  @require_repo_read
  @nickname('getRepoImageSecurity')
  @disallow_for_app_repositories
  @parse_args()
  @query_param('vulnerabilities', 'Include vulnerabilities informations', type=truthy_bool,
               default=False)
  def get(self, namespace, repository, imageid, parsed_args):
    """ Fetches the features and vulnerabilities (if any) for a repository image. """
    repo_image = model.image.get_repo_image(namespace, repository, imageid)
    if repo_image is None:
      raise NotFound()

    return _security_status_for_image(namespace, repository, repo_image,
                                      parsed_args.vulnerabilities)

@resource(MANIFEST_DIGEST_ROUTE + '/security')
@show_if(features.SECURITY_SCANNER)
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('manifestref', 'The digest of the manifest')
class RepositoryManifestSecurity(RepositoryParamResource):
  """ Operations for managing the vulnerabilities in a repository manifest. """

  @require_repo_read
  @nickname('getRepoManifestSecurity')
  @disallow_for_app_repositories
  @parse_args()
  @query_param('vulnerabilities', 'Include vulnerabilities informations', type=truthy_bool,
               default=False)
  def get(self, namespace, repository, manifestref, parsed_args):
    try:
      tag_manifest = model.tag.load_manifest_by_digest(namespace, repository, manifestref)
    except model.DataModelException:
      raise NotFound()

    repo_image = tag_manifest.tag.image

    return _security_status_for_image(namespace, repository, repo_image,
                                      parsed_args.vulnerabilities)