# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2012 OpenStack, LLC
# 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 tempest.api import compute
from tempest import clients
from tempest.common import log as logging
from tempest.common.utils.data_utils import parse_image_id
from tempest.common.utils.data_utils import rand_name
from tempest import exceptions
import tempest.test


LOG = logging.getLogger(__name__)


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

    conclusion = compute.generic_setup_package()

    @classmethod
    def setUpClass(cls):
        if not cls.config.service_available.nova:
            skip_msg = ("%s skipped as nova is not available" % cls.__name__)
            raise cls.skipException(skip_msg)
        cls.isolated_creds = []

        if cls.config.compute.allow_tenant_isolation:
            creds = cls._get_isolated_creds()
            username, tenant_name, password = creds
            os = clients.Manager(username=username,
                                 password=password,
                                 tenant_name=tenant_name,
                                 interface=cls._interface)
        else:
            os = clients.Manager(interface=cls._interface)

        cls.os = os
        cls.servers_client = os.servers_client
        cls.flavors_client = os.flavors_client
        cls.images_client = os.images_client
        cls.extensions_client = os.extensions_client
        cls.floating_ips_client = os.floating_ips_client
        cls.keypairs_client = os.keypairs_client
        cls.security_groups_client = os.security_groups_client
        cls.quotas_client = os.quotas_client
        cls.limits_client = os.limits_client
        cls.volumes_extensions_client = os.volumes_extensions_client
        cls.volumes_client = os.volumes_client
        cls.interfaces_client = os.interfaces_client
        cls.fixed_ips_client = os.fixed_ips_client
        cls.availability_zone_client = os.availability_zone_client
        cls.aggregates_client = os.aggregates_client
        cls.services_client = os.services_client
        cls.hypervisor_client = os.hypervisor_client
        cls.build_interval = cls.config.compute.build_interval
        cls.build_timeout = cls.config.compute.build_timeout
        cls.ssh_user = cls.config.compute.ssh_user
        cls.image_ref = cls.config.compute.image_ref
        cls.image_ref_alt = cls.config.compute.image_ref_alt
        cls.flavor_ref = cls.config.compute.flavor_ref
        cls.flavor_ref_alt = cls.config.compute.flavor_ref_alt
        cls.servers = []
        cls.images = []

        cls.servers_client_v3_auth = os.servers_client_v3_auth

    @classmethod
    def _get_identity_admin_client(cls):
        """
        Returns an instance of the Identity Admin API client
        """
        os = clients.AdminManager(interface=cls._interface)
        admin_client = os.identity_client
        return admin_client

    @classmethod
    def _get_client_args(cls):

        return (
            cls.config,
            cls.config.identity.admin_username,
            cls.config.identity.admin_password,
            cls.config.identity.uri
        )

    @classmethod
    def _get_isolated_creds(cls, admin=False):
        """
        Creates a new set of user/tenant/password credentials for a
        **regular** user of the Compute API so that a test case can
        operate in an isolated tenant container.
        """
        admin_client = cls._get_identity_admin_client()
        password = "pass"

        while True:
            try:
                rand_name_root = rand_name(cls.__name__)
                if cls.isolated_creds:
                # Main user already created. Create the alt one...
                    rand_name_root += '-alt'
                tenant_name = rand_name_root + "-tenant"
                tenant_desc = tenant_name + "-desc"

                resp, tenant = admin_client.create_tenant(
                    name=tenant_name, description=tenant_desc)
                break
            except exceptions.Duplicate:
                if cls.config.compute.allow_tenant_reuse:
                    tenant = admin_client.get_tenant_by_name(tenant_name)
                    LOG.info('Re-using existing tenant %s', tenant)
                    break

        while True:
            try:
                rand_name_root = rand_name(cls.__name__)
                if cls.isolated_creds:
                # Main user already created. Create the alt one...
                    rand_name_root += '-alt'
                username = rand_name_root + "-user"
                email = rand_name_root + "@example.com"
                resp, user = admin_client.create_user(username,
                                                      password,
                                                      tenant['id'],
                                                      email)
                break
            except exceptions.Duplicate:
                if cls.config.compute.allow_tenant_reuse:
                    user = admin_client.get_user_by_username(tenant['id'],
                                                             username)
                    LOG.info('Re-using existing user %s', user)
                    break
        # Store the complete creds (including UUID ids...) for later
        # but return just the username, tenant_name, password tuple
        # that the various clients will use.
        cls.isolated_creds.append((user, tenant))

        # Assign admin role if this is for admin creds
        if admin:
            _, roles = admin_client.list_roles()
            role = None
            try:
                _, roles = admin_client.list_roles()
                role = next(r for r in roles if r['name'] == 'admin')
            except StopIteration:
                msg = "No admin role found"
                raise exceptions.NotFound(msg)
            admin_client.assign_user_role(tenant['id'], user['id'], role['id'])

        return username, tenant_name, password

    @classmethod
    def clear_isolated_creds(cls):
        if not cls.isolated_creds:
            return
        admin_client = cls._get_identity_admin_client()

        for user, tenant in cls.isolated_creds:
            admin_client.delete_user(user['id'])
            admin_client.delete_tenant(tenant['id'])

    @classmethod
    def clear_servers(cls):
        for server in cls.servers:
            try:
                cls.servers_client.delete_server(server['id'])
            except Exception:
                pass

        for server in cls.servers:
            try:
                cls.servers_client.wait_for_server_termination(server['id'])
            except Exception:
                pass

    @classmethod
    def clear_images(cls):
        for image_id in cls.images:
            try:
                cls.images_client.delete_image(image_id)
            except Exception as exc:
                LOG.info('Exception raised deleting image %s', image_id)
                LOG.exception(exc)
                pass

    @classmethod
    def tearDownClass(cls):
        cls.clear_images()
        cls.clear_servers()
        cls.clear_isolated_creds()

    @classmethod
    def create_server(cls, **kwargs):
        """Wrapper utility that returns a test server."""
        name = rand_name(cls.__name__ + "-instance")
        if 'name' in kwargs:
            name = kwargs.pop('name')
        flavor = kwargs.get('flavor', cls.flavor_ref)
        image_id = kwargs.get('image_id', cls.image_ref)

        resp, body = cls.servers_client.create_server(
            name, image_id, flavor, **kwargs)

        # handle the case of multiple servers
        servers = [body]
        if 'min_count' in kwargs or 'max_count' in kwargs:
            # Get servers created which name match with name param.
            r, b = cls.servers_client.list_servers()
            servers = [s for s in b['servers'] if s['name'].startswith(name)]

        cls.servers.extend(servers)

        if 'wait_until' in kwargs:
            for server in servers:
                cls.servers_client.wait_for_server_status(
                    server['id'], kwargs['wait_until'])

        return resp, body

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

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

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

        return resp, image

    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)


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

    @classmethod
    def setUpClass(cls):
        super(BaseComputeAdminTest, cls).setUpClass()
        admin_username = cls.config.compute_admin.username
        admin_password = cls.config.compute_admin.password
        admin_tenant = cls.config.compute_admin.tenant_name
        if not (admin_username and admin_password and admin_tenant):
            msg = ("Missing Compute Admin API credentials "
                   "in configuration.")
            raise cls.skipException(msg)
        if cls.config.compute.allow_tenant_isolation:
            creds = cls._get_isolated_creds(admin=True)
            admin_username, admin_tenant_name, admin_password = creds
            cls.os_adm = clients.Manager(username=admin_username,
                                         password=admin_password,
                                         tenant_name=admin_tenant_name,
                                         interface=cls._interface)
        else:
            cls.os_adm = clients.ComputeAdminManager(interface=cls._interface)