# Copyright 2014: Dassault Systemes
# 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 logging
from rally.common import validation
from rally.task import context

from rally_openstack import consts
from rally_openstack.contexts.quotas import cinder_quotas
from rally_openstack.contexts.quotas import designate_quotas
from rally_openstack.contexts.quotas import manila_quotas
from rally_openstack.contexts.quotas import neutron_quotas
from rally_openstack.contexts.quotas import nova_quotas
from rally_openstack import osclients


LOG = logging.getLogger(__name__)


@validation.add("required_platform", platform="openstack", admin=True)
@context.configure(name="quotas", platform="openstack", order=300)
class Quotas(context.Context):
    """Sets OpenStack Tenants quotas."""

    CONFIG_SCHEMA = {
        "type": "object",
        "$schema": consts.JSON_SCHEMA,
        "additionalProperties": False,
        "properties": {
            "nova": nova_quotas.NovaQuotas.QUOTAS_SCHEMA,
            "cinder": cinder_quotas.CinderQuotas.QUOTAS_SCHEMA,
            "manila": manila_quotas.ManilaQuotas.QUOTAS_SCHEMA,
            "designate": designate_quotas.DesignateQuotas.QUOTAS_SCHEMA,
            "neutron": neutron_quotas.NeutronQuotas.QUOTAS_SCHEMA
        }
    }

    def __init__(self, ctx):
        super(Quotas, self).__init__(ctx)
        self.clients = osclients.Clients(
            self.context["admin"]["credential"],
            api_info=self.context["config"].get("api_versions"))

        self.manager = {
            "nova": nova_quotas.NovaQuotas(self.clients),
            "cinder": cinder_quotas.CinderQuotas(self.clients),
            "manila": manila_quotas.ManilaQuotas(self.clients),
            "designate": designate_quotas.DesignateQuotas(self.clients),
            "neutron": neutron_quotas.NeutronQuotas(self.clients)
        }
        self.original_quotas = []

    def _service_has_quotas(self, service):
        return len(self.config.get(service, {})) > 0

    def setup(self):
        for tenant_id in self.context["tenants"]:
            for service in self.manager:
                if self._service_has_quotas(service):
                    # NOTE(andreykurilin): in case of existing users it is
                    #   required to restore original quotas instead of reset
                    #   to default ones.
                    if "existing_users" in self.context:
                        self.original_quotas.append(
                            (service, tenant_id,
                             self.manager[service].get(tenant_id)))
                    self.manager[service].update(tenant_id,
                                                 **self.config[service])

    def _restore_quotas(self):
        for service, tenant_id, quotas in self.original_quotas:
            try:
                self.manager[service].update(tenant_id, **quotas)
            except Exception as e:
                LOG.warning("Failed to restore quotas for tenant %(tenant_id)s"
                            " in service %(service)s \n reason: %(exc)s" %
                            {"tenant_id": tenant_id, "service": service,
                             "exc": e})

    def _delete_quotas(self):
        for service in self.manager:
            if self._service_has_quotas(service):
                for tenant_id in self.context["tenants"]:
                    try:
                        self.manager[service].delete(tenant_id)
                    except Exception as e:
                        LOG.warning(
                            "Failed to remove quotas for tenant %(tenant)s "
                            "in service %(service)s reason: %(e)s" %
                            {"tenant": tenant_id, "service": service, "e": e})

    def cleanup(self):
        if self.original_quotas:
            # existing users
            self._restore_quotas()
        else:
            self._delete_quotas()