# Copyright 2012 OpenStack Foundation
# 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.

import time

from oslo_log import log as logging
from tempest_lib import exceptions as lib_exc

from tempest.common import compute
from tempest.common.utils import data_utils
from tempest.common import waiters
from tempest import config
from tempest import exceptions
import tempest.test

CONF = config.CONF

LOG = logging.getLogger(__name__)


class BaseComputeTest(tempest.test.BaseTestCase):
    """Base test case class for all Compute API tests."""

    _api_version = 2
    force_tenant_isolation = False

    # TODO(andreaf) We should care also for the alt_manager here
    # but only once client lazy load in the manager is done
    credentials = ['primary']

    @classmethod
    def skip_checks(cls):
        super(BaseComputeTest, cls).skip_checks()
        if not CONF.service_available.nova:
            raise cls.skipException("Nova is not available")
        if cls._api_version != 2:
            msg = ("Unexpected API version is specified (%s)" %
                   cls._api_version)
            raise exceptions.InvalidConfiguration(message=msg)

    @classmethod
    def setup_credentials(cls):
        cls.set_network_resources()
        super(BaseComputeTest, cls).setup_credentials()

    @classmethod
    def setup_clients(cls):
        super(BaseComputeTest, cls).setup_clients()
        cls.servers_client = cls.os.servers_client
        cls.server_groups_client = cls.os.server_groups_client
        cls.flavors_client = cls.os.flavors_client
        cls.images_client = cls.os.images_client
        cls.extensions_client = cls.os.extensions_client
        cls.floating_ip_pools_client = cls.os.floating_ip_pools_client
        cls.floating_ips_client = cls.os.floating_ips_client
        cls.keypairs_client = cls.os.keypairs_client
        cls.security_group_rules_client = cls.os.security_group_rules_client
        cls.security_groups_client = cls.os.security_groups_client
        cls.quotas_client = cls.os.quotas_client
        cls.quota_classes_client = cls.os.quota_classes_client
        cls.compute_networks_client = cls.os.compute_networks_client
        cls.limits_client = cls.os.limits_client
        cls.volumes_extensions_client = cls.os.volumes_extensions_client
        cls.snapshots_extensions_client = cls.os.snapshots_extensions_client
        cls.interfaces_client = cls.os.interfaces_client
        cls.fixed_ips_client = cls.os.fixed_ips_client
        cls.availability_zone_client = cls.os.availability_zone_client
        cls.agents_client = cls.os.agents_client
        cls.aggregates_client = cls.os.aggregates_client
        cls.services_client = cls.os.services_client
        cls.instance_usages_audit_log_client = (
            cls.os.instance_usages_audit_log_client)
        cls.hypervisor_client = cls.os.hypervisor_client
        cls.certificates_client = cls.os.certificates_client
        cls.migrations_client = cls.os.migrations_client
        cls.security_group_default_rules_client = (
            cls.os.security_group_default_rules_client)
        cls.versions_client = cls.os.compute_versions_client

        if CONF.volume_feature_enabled.api_v1:
            cls.volumes_client = cls.os.volumes_client
        else:
            cls.volumes_client = cls.os.volumes_v2_client

    @classmethod
    def resource_setup(cls):
        super(BaseComputeTest, cls).resource_setup()
        cls.build_interval = CONF.compute.build_interval
        cls.build_timeout = CONF.compute.build_timeout
        cls.ssh_user = CONF.compute.ssh_user
        cls.image_ref = CONF.compute.image_ref
        cls.image_ref_alt = CONF.compute.image_ref_alt
        cls.flavor_ref = CONF.compute.flavor_ref
        cls.flavor_ref_alt = CONF.compute.flavor_ref_alt
        cls.image_ssh_user = CONF.compute.image_ssh_user
        cls.image_ssh_password = CONF.compute.image_ssh_password
        cls.servers = []
        cls.images = []
        cls.security_groups = []
        cls.server_groups = []

    @classmethod
    def resource_cleanup(cls):
        cls.clear_images()
        cls.clear_servers()
        cls.clear_security_groups()
        cls.clear_server_groups()
        super(BaseComputeTest, cls).resource_cleanup()

    @classmethod
    def clear_servers(cls):
        LOG.debug('Clearing servers: %s', ','.join(
            server['id'] for server in cls.servers))
        for server in cls.servers:
            try:
                cls.servers_client.delete_server(server['id'])
            except lib_exc.NotFound:
                # Something else already cleaned up the server, nothing to be
                # worried about
                pass
            except Exception:
                LOG.exception('Deleting server %s failed' % server['id'])

        for server in cls.servers:
            try:
                waiters.wait_for_server_termination(cls.servers_client,
                                                    server['id'])
            except Exception:
                LOG.exception('Waiting for deletion of server %s failed'
                              % server['id'])

    @classmethod
    def server_check_teardown(cls):
        """Checks is the shared server clean enough for subsequent test.
           Method will delete the server when it's dirty.
           The setUp method is responsible for creating a new server.
           Exceptions raised in tearDown class are fails the test case,
           This method supposed to use only by tierDown methods, when
           the shared server_id is stored in the server_id of the class.
        """
        if getattr(cls, 'server_id', None) is not None:
            try:
                waiters.wait_for_server_status(cls.servers_client,
                                               cls.server_id, 'ACTIVE')
            except Exception as exc:
                LOG.exception(exc)
                cls.servers_client.delete_server(cls.server_id)
                waiters.wait_for_server_termination(cls.servers_client,
                                                    cls.server_id)
                cls.server_id = None
                raise

    @classmethod
    def clear_images(cls):
        LOG.debug('Clearing images: %s', ','.join(cls.images))
        for image_id in cls.images:
            try:
                cls.images_client.delete_image(image_id)
            except lib_exc.NotFound:
                # The image may have already been deleted which is OK.
                pass
            except Exception:
                LOG.exception('Exception raised deleting image %s' % image_id)

    @classmethod
    def clear_security_groups(cls):
        LOG.debug('Clearing security groups: %s', ','.join(
            str(sg['id']) for sg in cls.security_groups))
        for sg in cls.security_groups:
            try:
                cls.security_groups_client.delete_security_group(sg['id'])
            except lib_exc.NotFound:
                # The security group may have already been deleted which is OK.
                pass
            except Exception as exc:
                LOG.info('Exception raised deleting security group %s',
                         sg['id'])
                LOG.exception(exc)

    @classmethod
    def clear_server_groups(cls):
        LOG.debug('Clearing server groups: %s', ','.join(cls.server_groups))
        for server_group_id in cls.server_groups:
            try:
                cls.server_groups_client.delete_server_group(server_group_id)
            except lib_exc.NotFound:
                # The server-group may have already been deleted which is OK.
                pass
            except Exception:
                LOG.exception('Exception raised deleting server-group %s',
                              server_group_id)

    @classmethod
    def create_test_server(cls, validatable=False, volume_backed=False,
                           **kwargs):
        """Wrapper utility that returns a test server.

        This wrapper utility calls the common create test server and
        returns a test server. The purpose of this wrapper is to minimize
        the impact on the code of the tests already using this
        function.

        :param validatable: Whether the server will be pingable or sshable.
        :param volume_backed: Whether the instance is volume backed or not.
        """
        tenant_network = cls.get_tenant_network()
        body, servers = compute.create_test_server(
            cls.os,
            validatable,
            validation_resources=cls.validation_resources,
            tenant_network=tenant_network,
            volume_backed=volume_backed,
            **kwargs)

        cls.servers.extend(servers)

        return body

    @classmethod
    def create_security_group(cls, name=None, description=None):
        if name is None:
            name = data_utils.rand_name(cls.__name__ + "-securitygroup")
        if description is None:
            description = data_utils.rand_name('description')
        body = cls.security_groups_client.create_security_group(
            name=name, description=description)['security_group']
        cls.security_groups.append(body)

        return body

    @classmethod
    def create_test_server_group(cls, name="", policy=None):
        if not name:
            name = data_utils.rand_name(cls.__name__ + "-Server-Group")
        if policy is None:
            policy = ['affinity']
        body = cls.server_groups_client.create_server_group(
            name=name, policies=policy)['server_group']
        cls.server_groups.append(body['id'])
        return body

    def wait_for(self, condition):
        """Repeatedly calls condition() until a timeout."""
        start_time = int(time.time())
        while True:
            try:
                condition()
            except Exception:
                pass
            else:
                return
            if int(time.time()) - start_time >= self.build_timeout:
                condition()
                return
            time.sleep(self.build_interval)

    @staticmethod
    def _delete_volume(volumes_client, volume_id):
        """Deletes the given volume and waits for it to be gone."""
        try:
            volumes_client.delete_volume(volume_id)
            # TODO(mriedem): We should move the wait_for_resource_deletion
            # into the delete_volume method as a convenience to the caller.
            volumes_client.wait_for_resource_deletion(volume_id)
        except lib_exc.NotFound:
            LOG.warn("Unable to delete volume '%s' since it was not found. "
                     "Maybe it was already deleted?" % volume_id)

    @classmethod
    def prepare_instance_network(cls):
        if (CONF.validation.auth_method != 'disabled' and
                CONF.validation.connect_method == 'floating'):
            cls.set_network_resources(network=True, subnet=True, router=True,
                                      dhcp=True)

    @classmethod
    def create_image_from_server(cls, server_id, **kwargs):
        """Wrapper utility that returns an image created from the server."""
        name = data_utils.rand_name(cls.__name__ + "-image")
        if 'name' in kwargs:
            name = kwargs.pop('name')

        image = cls.images_client.create_image(server_id, name=name)
        image_id = data_utils.parse_image_id(image.response['location'])
        cls.images.append(image_id)

        if 'wait_until' in kwargs:
            waiters.wait_for_image_status(cls.images_client,
                                          image_id, kwargs['wait_until'])
            image = cls.images_client.show_image(image_id)['image']

            if kwargs['wait_until'] == 'ACTIVE':
                if kwargs.get('wait_for_server', True):
                    waiters.wait_for_server_status(cls.servers_client,
                                                   server_id, 'ACTIVE')
        return image

    @classmethod
    def rebuild_server(cls, server_id, validatable=False, **kwargs):
        # Destroy an existing server and creates a new one
        if server_id:
            try:
                cls.servers_client.delete_server(server_id)
                waiters.wait_for_server_termination(cls.servers_client,
                                                    server_id)
            except Exception:
                LOG.exception('Failed to delete server %s' % server_id)

        server = cls.create_test_server(
            validatable,
            wait_until='ACTIVE',
            **kwargs)
        cls.password = server['adminPass']
        return server['id']

    @classmethod
    def delete_server(cls, server_id):
        """Deletes an existing server and waits for it to be gone."""
        try:
            cls.servers_client.delete_server(server_id)
            waiters.wait_for_server_termination(cls.servers_client,
                                                server_id)
        except Exception:
            LOG.exception('Failed to delete server %s' % server_id)

    @classmethod
    def delete_volume(cls, volume_id):
        """Deletes the given volume and waits for it to be gone."""
        cls._delete_volume(cls.volumes_extensions_client, volume_id)

    @classmethod
    def get_server_ip(cls, server):
        """Get the server fixed or floating IP.

        For the floating IP, the address created by the validation resources
        is returned.
        For the fixed IP, the server is returned and the current mechanism of
        address extraction in the remote_client is followed.
        """
        if CONF.validation.connect_method == 'floating':
            ip_or_server = cls.validation_resources['floating_ip']['ip']
        elif CONF.validation.connect_method == 'fixed':
            ip_or_server = server
        return ip_or_server


class BaseV2ComputeTest(BaseComputeTest):
    _api_version = 2


class BaseComputeAdminTest(BaseComputeTest):
    """Base test case class for Compute Admin API tests."""

    credentials = ['primary', 'admin']

    @classmethod
    def setup_clients(cls):
        super(BaseComputeAdminTest, cls).setup_clients()
        cls.availability_zone_admin_client = (
            cls.os_adm.availability_zone_client)


class BaseV2ComputeAdminTest(BaseComputeAdminTest):
    """Base test case class for Compute Admin V2 API tests."""
    _api_version = 2