""" List and lookup repository images. """
import json

from data.registry_model import registry_model
from endpoints.api import (resource, nickname, require_repo_read, RepositoryParamResource,
                           path_param, disallow_for_app_repositories, format_date)
from endpoints.exception import NotFound


def image_dict(image, with_history=False, with_tags=False):
  parsed_command = None
  if image.command:
    try:
      parsed_command = json.loads(image.command)
    except (ValueError, TypeError):
      parsed_command = {'error': 'Could not parse command'}

  image_data = {
    'id': image.docker_image_id,
    'created': format_date(image.created),
    'comment': image.comment,
    'command': parsed_command,
    'size': image.image_size,
    'uploading': image.uploading,
    'sort_index': len(image.parents),
  }

  if with_tags:
    image_data['tags'] = [tag.name for tag in image.tags]

  if with_history:
    image_data['history'] = [image_dict(parent) for parent in image.parents]

  # Calculate the ancestors string, with the DBID's replaced with the docker IDs.
  parent_docker_ids = [parent_image.docker_image_id for parent_image in image.parents]
  image_data['ancestors'] = '/{0}/'.format('/'.join(parent_docker_ids))
  return image_data


@resource('/v1/repository/<apirepopath:repository>/image/')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
class RepositoryImageList(RepositoryParamResource):
  """ Resource for listing repository images. """

  @require_repo_read
  @nickname('listRepositoryImages')
  @disallow_for_app_repositories
  def get(self, namespace, repository):
    """ List the images for the specified repository. """
    repo_ref = registry_model.lookup_repository(namespace, repository)
    if repo_ref is None:
      raise NotFound()

    images = registry_model.get_legacy_images(repo_ref)
    return {'images': [image_dict(image, with_tags=True) for image in images]}


@resource('/v1/repository/<apirepopath:repository>/image/<image_id>')
@path_param('repository', 'The full path of the repository. e.g. namespace/name')
@path_param('image_id', 'The Docker image ID')
class RepositoryImage(RepositoryParamResource):
  """ Resource for handling repository images. """

  @require_repo_read
  @nickname('getImage')
  @disallow_for_app_repositories
  def get(self, namespace, repository, image_id):
    """ Get the information available for the specified image. """
    repo_ref = registry_model.lookup_repository(namespace, repository)
    if repo_ref is None:
      raise NotFound()

    image = registry_model.get_legacy_image(repo_ref, image_id, include_parents=True)
    if image is None:
      raise NotFound()

    return image_dict(image, with_history=True)