# All Rights Reserved.
#
# 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.

from rally.common import validation
from rally import exceptions

from rally_openstack.common import consts
from rally_openstack.common import osclients
from rally_openstack.common.services.image import image as image_services
from rally_openstack.task.cleanup import manager as resource_manager
from rally_openstack.task import context
from rally_openstack.task.scenarios.sahara import utils


@validation.add("required_platform", platform="openstack", users=True)
@context.configure(name="sahara_image", platform="openstack", order=440)
class SaharaImage(context.OpenStackContext):
    """Context class for adding and tagging Sahara images."""

    CONFIG_SCHEMA = {
        "type": "object",
        "$schema": consts.JSON_SCHEMA,
        "properties": {
            "image_uuid": {
                "type": "string"
            },
            "image_url": {
                "type": "string",
            },
            "username": {
                "type": "string"
            },
            "plugin_name": {
                "type": "string",
            },
            "hadoop_version": {
                "type": "string",
            }
        },
        "oneOf": [
            {"description": "Create an image.",
             "required": ["image_url", "username", "plugin_name",
                          "hadoop_version"]},
            {"description": "Use an existing image.",
             "required": ["image_uuid"]}
        ],
        "additionalProperties": False
    }

    def _create_image(self, hadoop_version, image_url, plugin_name, user,
                      user_name):
        clients = osclients.Clients(user["credential"])
        image_service = image_services.Image(
            clients, name_generator=self.generate_random_name)
        image = image_service.create_image(container_format="bare",
                                           image_location=image_url,
                                           disk_format="qcow2")
        clients.sahara().images.update_image(
            image_id=image.id, user_name=user_name, desc="")
        clients.sahara().images.update_tags(
            image_id=image.id, new_tags=[plugin_name, hadoop_version])
        return image.id

    def setup(self):
        utils.init_sahara_context(self)
        self.context["sahara"]["images"] = {}

        # The user may want to use the existing image. In this case he should
        # make sure that the image is public and has all required metadata.
        image_uuid = self.config.get("image_uuid")

        self.context["sahara"]["need_image_cleanup"] = not image_uuid

        if image_uuid:
            # Using the first user to check the existing image.
            user = self.context["users"][0]
            clients = osclients.Clients(user["credential"])

            image = clients.glance().images.get(image_uuid)

            visibility = None
            if hasattr(image, "is_public"):
                visibility = "public" if image.is_public else "private"
            else:
                visibility = image["visibility"]

            if visibility != "public":
                raise exceptions.ContextSetupFailure(
                    ctx_name=self.get_name(),
                    msg="Use only public image for sahara_image context"
                )
            image_id = image_uuid

            for user, tenant_id in self._iterate_per_tenants():
                self.context["tenants"][tenant_id]["sahara"]["image"] = (
                    image_id)
        else:
            for user, tenant_id in self._iterate_per_tenants():

                image_id = self._create_image(
                    hadoop_version=self.config["hadoop_version"],
                    image_url=self.config["image_url"],
                    plugin_name=self.config["plugin_name"],
                    user=user,
                    user_name=self.config["username"])

                self.context["tenants"][tenant_id]["sahara"]["image"] = (
                    image_id)

    def cleanup(self):
        if self.context["sahara"]["need_image_cleanup"]:
            resource_manager.cleanup(names=["glance.images"],
                                     users=self.context.get("users", []),
                                     superclass=self.__class__,
                                     task_id=self.get_owner_id())
