# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# import types so that we can reference ListType in sphinx param declarations.
# We can't just use list, because sphinx gets confused by
# openstack.resource.Resource.list and openstack.resource2.Resource.list
import types  # noqa

from openstack.cloud import _normalize
from openstack.cloud import _utils
from openstack.cloud import exc
from openstack import utils


def _no_pending_images(images):
    """If there are any images not in a steady state, don't cache"""
    for image in images:
        if image.status not in ('active', 'deleted', 'killed'):
            return False
    return True


class ImageCloudMixin(_normalize.Normalizer):

    def __init__(self):
        self.image_api_use_tasks = self.config.config['image_api_use_tasks']

    @property
    def _raw_image_client(self):
        if 'raw-image' not in self._raw_clients:
            image_client = self._get_raw_client('image')
            self._raw_clients['raw-image'] = image_client
        return self._raw_clients['raw-image']

    @property
    def _image_client(self):
        if 'image' not in self._raw_clients:
            self._raw_clients['image'] = self._get_versioned_client(
                'image', min_version=1, max_version='2.latest')
        return self._raw_clients['image']

    def search_images(self, name_or_id=None, filters=None):
        images = self.list_images()
        return _utils._filter_list(images, name_or_id, filters)

    @_utils.cache_on_arguments(should_cache_fn=_no_pending_images)
    def list_images(self, filter_deleted=True, show_all=False):
        """Get available images.

        :param filter_deleted: Control whether deleted images are returned.
        :param show_all: Show all images, including images that are shared
            but not accepted. (By default in glance v2 shared image that
            have not been accepted are not shown) show_all will override the
            value of filter_deleted to False.
        :returns: A list of glance images.
        """
        if show_all:
            filter_deleted = False
        # First, try to actually get images from glance, it's more efficient
        images = []
        params = {}
        image_list = []
        if self._is_client_version('image', 2):
            if show_all:
                params['member_status'] = 'all'
        image_list = list(self.image.images(**params))

        for image in image_list:
            # The cloud might return DELETED for invalid images.
            # While that's cute and all, that's an implementation detail.
            if not filter_deleted:
                images.append(image)
            elif image.status.lower() != 'deleted':
                images.append(image)
        return self._normalize_images(images)

    def get_image(self, name_or_id, filters=None):
        """Get an image by name or ID.

        :param name_or_id: Name or ID of the image.
        :param filters:
            A dictionary of meta data to use for further filtering. Elements
            of this dictionary may, themselves, be dictionaries. Example::

                {
                  'last_name': 'Smith',
                  'other': {
                      'gender': 'Female'
                  }
                }

            OR
            A string containing a jmespath expression for further filtering.
            Example:: "[?last_name==`Smith`] | [?other.gender]==`Female`]"

        :returns: An image ``munch.Munch`` or None if no matching image
                  is found

        """
        return _utils._get_entity(self, 'image', name_or_id, filters)

    def get_image_by_id(self, id):
        """ Get a image by ID

        :param id: ID of the image.
        :returns: An image ``munch.Munch``.
        """
        image = self._normalize_image(
            self.image.get_image(image={'id': id}))

        return image

    def download_image(
            self, name_or_id, output_path=None, output_file=None,
            chunk_size=1024):
        """Download an image by name or ID

        :param str name_or_id: Name or ID of the image.
        :param output_path: the output path to write the image to. Either this
            or output_file must be specified
        :param output_file: a file object (or file-like object) to write the
            image data to. Only write() will be called on this object. Either
            this or output_path must be specified
        :param int chunk_size: size in bytes to read from the wire and buffer
            at one time. Defaults to 1024

        :raises: OpenStackCloudException in the event download_image is called
            without exactly one of either output_path or output_file
        :raises: OpenStackCloudResourceNotFound if no images are found matching
            the name or ID provided
        """
        if output_path is None and output_file is None:
            raise exc.OpenStackCloudException(
                'No output specified, an output path or file object'
                ' is necessary to write the image data to')
        elif output_path is not None and output_file is not None:
            raise exc.OpenStackCloudException(
                'Both an output path and file object were provided,'
                ' however only one can be used at once')

        image = self.image.find_image(name_or_id)
        if not image:
            raise exc.OpenStackCloudResourceNotFound(
                "No images with name or ID %s were found" % name_or_id, None)

        return self.image.download_image(
            image, output=output_file or output_path,
            chunk_size=chunk_size)

    def get_image_exclude(self, name_or_id, exclude):
        for image in self.search_images(name_or_id):
            if exclude:
                if exclude not in image.name:
                    return image
            else:
                return image
        return None

    def get_image_name(self, image_id, exclude=None):
        image = self.get_image_exclude(image_id, exclude)
        if image:
            return image.name
        return None

    def get_image_id(self, image_name, exclude=None):
        image = self.get_image_exclude(image_name, exclude)
        if image:
            return image.id
        return None

    def wait_for_image(self, image, timeout=3600):
        image_id = image['id']
        for count in utils.iterate_timeout(
                timeout, "Timeout waiting for image to snapshot"):
            self.list_images.invalidate(self)
            image = self.get_image(image_id)
            if not image:
                continue
            if image['status'] == 'active':
                return image
            elif image['status'] == 'error':
                raise exc.OpenStackCloudException(
                    'Image {image} hit error state'.format(image=image_id))

    def delete_image(
            self, name_or_id, wait=False, timeout=3600, delete_objects=True):
        """Delete an existing image.

        :param name_or_id: Name of the image to be deleted.
        :param wait: If True, waits for image to be deleted.
        :param timeout: Seconds to wait for image deletion. None is forever.
        :param delete_objects: If True, also deletes uploaded swift objects.

        :returns: True if delete succeeded, False otherwise.

        :raises: OpenStackCloudException if there are problems deleting.
        """
        image = self.get_image(name_or_id)
        if not image:
            return False
        self.image.delete_image(image)
        self.list_images.invalidate(self)

        # Task API means an image was uploaded to swift
        # TODO(gtema) does it make sense to move this into proxy?
        if self.image_api_use_tasks and (
                self.image._IMAGE_OBJECT_KEY in image
                or self.image._SHADE_IMAGE_OBJECT_KEY in image):
            (container, objname) = image.get(
                self.image._IMAGE_OBJECT_KEY, image.get(
                    self.image._SHADE_IMAGE_OBJECT_KEY)).split('/', 1)
            self.delete_object(container=container, name=objname)

        if wait:
            for count in utils.iterate_timeout(
                    timeout,
                    "Timeout waiting for the image to be deleted."):
                self._get_cache(None).invalidate()
                if self.get_image(image.id) is None:
                    break
        return True

    def create_image(
            self, name, filename=None,
            container=None,
            md5=None, sha256=None,
            disk_format=None, container_format=None,
            disable_vendor_agent=True,
            wait=False, timeout=3600, tags=None,
            allow_duplicates=False, meta=None, volume=None, **kwargs):
        """Upload an image.

        :param str name: Name of the image to create. If it is a pathname
                         of an image, the name will be constructed from the
                         extensionless basename of the path.
        :param str filename: The path to the file to upload, if needed.
                             (optional, defaults to None)
        :param str container: Name of the container in swift where images
                              should be uploaded for import if the cloud
                              requires such a thing. (optiona, defaults to
                              'images')
        :param str md5: md5 sum of the image file. If not given, an md5 will
                        be calculated.
        :param str sha256: sha256 sum of the image file. If not given, an md5
                           will be calculated.
        :param str disk_format: The disk format the image is in. (optional,
                                defaults to the os-client-config config value
                                for this cloud)
        :param str container_format: The container format the image is in.
                                     (optional, defaults to the
                                     os-client-config config value for this
                                     cloud)
        :param list tags: List of tags for this image. Each tag is a string
                          of at most 255 chars.
        :param bool disable_vendor_agent: Whether or not to append metadata
                                          flags to the image to inform the
                                          cloud in question to not expect a
                                          vendor agent to be runing.
                                          (optional, defaults to True)
        :param bool wait: If true, waits for image to be created. Defaults to
                          true - however, be aware that one of the upload
                          methods is always synchronous.
        :param timeout: Seconds to wait for image creation. None is forever.
        :param allow_duplicates: If true, skips checks that enforce unique
                                 image name. (optional, defaults to False)
        :param meta: A dict of key/value pairs to use for metadata that
                     bypasses automatic type conversion.
        :param volume: Name or ID or volume object of a volume to create an
                       image from. Mutually exclusive with (optional, defaults
                       to None)

        Additional kwargs will be passed to the image creation as additional
        metadata for the image and will have all values converted to string
        except for min_disk, min_ram, size and virtual_size which will be
        converted to int.

        If you are sure you have all of your data types correct or have an
        advanced need to be explicit, use meta. If you are just a normal
        consumer, using kwargs is likely the right choice.

        If a value is in meta and kwargs, meta wins.

        :returns: A ``munch.Munch`` of the Image object

        :raises: OpenStackCloudException if there are problems uploading
        """
        if volume:
            image = self.block_storage.create_image(
                name=name, volume=volume,
                allow_duplicates=allow_duplicates,
                container_format=container_format, disk_format=disk_format,
                wait=wait, timeout=timeout)
        else:
            image = self.image.create_image(
                name, filename=filename,
                container=container,
                md5=md5, sha256=sha256,
                disk_format=disk_format, container_format=container_format,
                disable_vendor_agent=disable_vendor_agent,
                wait=wait, timeout=timeout, tags=tags,
                allow_duplicates=allow_duplicates, meta=meta, **kwargs)

        self._get_cache(None).invalidate()
        if not wait:
            return image
        try:
            for count in utils.iterate_timeout(
                    timeout,
                    "Timeout waiting for the image to finish."):
                image_obj = self.get_image(image.id)
                if image_obj and image_obj.status not in ('queued', 'saving'):
                    return image_obj
        except exc.OpenStackCloudTimeout:
            self.log.debug(
                "Timeout waiting for image to become ready. Deleting.")
            self.delete_image(image.id, wait=True)
            raise

    def update_image_properties(
            self, image=None, name_or_id=None, meta=None, **properties):
        image = image or name_or_id
        return self.image.update_image_properties(
            image=image, meta=meta, **properties)
