# Copyright 2018 Canonical Ltd.
#
# 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.

"""Encapsulate octavia testing."""

import logging
import subprocess
import tenacity

import zaza.openstack.charm_tests.test_utils as test_utils
import zaza.openstack.utilities.openstack as openstack_utils


class CharmOperationTest(test_utils.OpenStackBaseTest):
    """Charm operation tests."""

    @classmethod
    def setUpClass(cls):
        """Run class setup for running Octavia charm operation tests."""
        super(CharmOperationTest, cls).setUpClass()

    def test_pause_resume(self):
        """Run pause and resume tests.

        Pause service and check services are stopped, then resume and check
        they are started.
        """
        self.pause_resume(['apache2'])


class LBAASv2Test(test_utils.OpenStackBaseTest):
    """LBaaSv2 service tests."""

    @classmethod
    def setUpClass(cls):
        """Run class setup for running LBaaSv2 service tests."""
        super(LBAASv2Test, cls).setUpClass()

    def test_create_loadbalancer(self):
        """Create load balancer."""
        keystone_session = openstack_utils.get_overcloud_keystone_session()
        neutron_client = openstack_utils.get_neutron_session_client(
            keystone_session)
        nova_client = openstack_utils.get_nova_session_client(
            keystone_session)

        # Get IP of the prepared payload instances
        payload_ips = []
        for server in nova_client.servers.list():
            payload_ips.append(server.networks['private'][0])
        self.assertTrue(len(payload_ips) > 0)

        resp = neutron_client.list_networks(name='private_lb_fip_network')
        vip_subnet_id = resp['networks'][0]['subnets'][0]
        resp = neutron_client.list_networks(name='private')
        subnet_id = resp['networks'][0]['subnets'][0]
        octavia_client = openstack_utils.get_octavia_session_client(
            keystone_session)
        result = octavia_client.load_balancer_create(
            json={
                'loadbalancer': {
                    'description': 'Created by Zaza',
                    'admin_state_up': True,
                    'vip_subnet_id': vip_subnet_id,
                    'name': 'zaza-lb-0',
                }})
        lb_id = result['loadbalancer']['id']
        lb_vip_port_id = result['loadbalancer']['vip_port_id']

        @tenacity.retry(wait=tenacity.wait_fixed(1),
                        reraise=True, stop=tenacity.stop_after_delay(900))
        def wait_for_lb_resource(octavia_show_func, resource_id,
                                 operating_status=None):
            resp = octavia_show_func(resource_id)
            logging.info(resp['provisioning_status'])
            assert resp['provisioning_status'] == 'ACTIVE', (
                'load balancer resource has not reached '
                'expected provisioning status: {}'
                .format(resp))
            if operating_status:
                logging.info(resp['operating_status'])
                assert resp['operating_status'] == operating_status, (
                    'load balancer resource has not reached '
                    'expected operating status: {}'.format(resp))

            return resp
        logging.info('Awaiting loadbalancer to reach provisioning_status '
                     '"ACTIVE"')
        resp = wait_for_lb_resource(octavia_client.load_balancer_show, lb_id)
        logging.info(resp)

        result = octavia_client.listener_create(
            json={
                'listener': {
                    'loadbalancer_id': lb_id,
                    'name': 'listener1',
                    'protocol': 'HTTP',
                    'protocol_port': 80
                },
            })
        listener_id = result['listener']['id']
        logging.info('Awaiting listener to reach provisioning_status '
                     '"ACTIVE"')
        resp = wait_for_lb_resource(octavia_client.listener_show, listener_id)
        logging.info(resp)

        result = octavia_client.pool_create(
            json={
                'pool': {
                    'listener_id': listener_id,
                    'name': 'pool1',
                    'lb_algorithm': 'ROUND_ROBIN',
                    'protocol': 'HTTP',
                },
            })
        pool_id = result['pool']['id']
        logging.info('Awaiting pool to reach provisioning_status '
                     '"ACTIVE"')
        resp = wait_for_lb_resource(octavia_client.pool_show, pool_id)
        logging.info(resp)

        result = octavia_client.health_monitor_create(
            json={
                'healthmonitor': {
                    'pool_id': pool_id,
                    'delay': 5,
                    'max_retries': 4,
                    'timeout': 10,
                    'type': 'HTTP',
                    'url_path': '/',
                },
            })
        healthmonitor_id = result['healthmonitor']['id']
        logging.info('Awaiting healthmonitor to reach provisioning_status '
                     '"ACTIVE"')
        resp = wait_for_lb_resource(octavia_client.health_monitor_show,
                                    healthmonitor_id)
        logging.info(resp)

        for ip in payload_ips:
            result = octavia_client.member_create(
                pool_id=pool_id,
                json={
                    'member': {
                        'subnet_id': subnet_id,
                        'address': ip,
                        'protocol_port': 80,
                    },
                })
            member_id = result['member']['id']
            logging.info('Awaiting member to reach provisioning_status '
                         '"ACTIVE"')
            resp = wait_for_lb_resource(
                lambda x: octavia_client.member_show(
                    pool_id=pool_id, member_id=x),
                member_id,
                operating_status='ONLINE')
            logging.info(resp)

        lb_fp = openstack_utils.create_floating_ip(
            neutron_client, 'ext_net', port={'id': lb_vip_port_id})

        @tenacity.retry(wait=tenacity.wait_fixed(1),
                        reraise=True, stop=tenacity.stop_after_delay(900))
        def get_payload():
            return subprocess.check_output(
                ['wget', '-O', '-',
                 'http://{}/'.format(lb_fp['floating_ip_address'])],
                universal_newlines=True)
        snippet = 'This is the default welcome page'
        assert snippet in get_payload()
        logging.info('Found "{}" in page retrieved through load balancer at '
                     '"http://{}/"'
                     .format(snippet, lb_fp['floating_ip_address']))