#    Copyright 2010 OpenStack Foundation
#    Copyright 2012 University Of Minho
#    Copyright 2014-2015 Red Hat, Inc
#
#    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 sys

import mock
from oslo_config import cfg
from oslo_utils import encodeutils

from jacket import context
from jacket.compute import exception
from jacket.compute import test
from jacket.tests.compute.unit.virt.libvirt import fakelibvirt
from jacket.compute import utils
from jacket.compute.virt.libvirt import config as vconfig
from jacket.compute.virt.libvirt import guest as libvirt_guest
from jacket.compute.virt.libvirt import host


host.libvirt = fakelibvirt
libvirt_guest.libvirt = fakelibvirt

CONF = cfg.CONF

if sys.version_info > (3,):
    long = int


class GuestTestCase(test.NoDBTestCase):

    def setUp(self):
        super(GuestTestCase, self).setUp()

        self.useFixture(fakelibvirt.FakeLibvirtFixture())
        self.host = host.Host("qemu:///system")
        self.context = context.get_admin_context()

        self.domain = mock.Mock(spec=fakelibvirt.virDomain)
        self.guest = libvirt_guest.Guest(self.domain)

    def test_repr(self):
        self.domain.ID.return_value = 99
        self.domain.UUIDString.return_value = "UUID"
        self.domain.name.return_value = "foo"
        self.assertEqual("<Guest 99 foo UUID>", repr(self.guest))

    @mock.patch.object(fakelibvirt.Connection, 'defineXML')
    def test_create(self, mock_define):
        libvirt_guest.Guest.create("xml", self.host)
        mock_define.assert_called_once_with("xml")

    @mock.patch.object(fakelibvirt.Connection, 'defineXML')
    def test_create_exception(self, mock_define):
        mock_define.side_effect = test.TestingException
        self.assertRaises(test.TestingException,
                          libvirt_guest.Guest.create,
                          "foo", self.host)

    def test_launch(self):
        self.guest.launch()
        self.domain.createWithFlags.assert_called_once_with(0)

    def test_launch_and_pause(self):
        self.guest.launch(pause=True)
        self.domain.createWithFlags.assert_called_once_with(
            fakelibvirt.VIR_DOMAIN_START_PAUSED)

    def test_shutdown(self):
        self.domain.shutdown = mock.MagicMock()
        self.guest.shutdown()
        self.domain.shutdown.assert_called_once_with()

    @mock.patch.object(encodeutils, 'safe_decode')
    def test_launch_exception(self, mock_safe_decode):
        self.domain.createWithFlags.side_effect = test.TestingException
        mock_safe_decode.return_value = "</xml>"
        self.assertRaises(test.TestingException, self.guest.launch)
        self.assertEqual(1, mock_safe_decode.called)

    @mock.patch.object(utils, 'execute')
    @mock.patch.object(libvirt_guest.Guest, 'get_interfaces')
    def test_enable_hairpin(self, mock_get_interfaces, mock_execute):
        mock_get_interfaces.return_value = ["vnet0", "vnet1"]
        self.guest.enable_hairpin()
        mock_execute.assert_has_calls([
            mock.call(
                'tee', '/sys/class/net/vnet0/brport/hairpin_mode',
                run_as_root=True, process_input='1', check_exit_code=[0, 1]),
            mock.call(
                'tee', '/sys/class/net/vnet1/brport/hairpin_mode',
                run_as_root=True, process_input='1', check_exit_code=[0, 1])])

    @mock.patch.object(encodeutils, 'safe_decode')
    @mock.patch.object(utils, 'execute')
    @mock.patch.object(libvirt_guest.Guest, 'get_interfaces')
    def test_enable_hairpin_exception(self, mock_get_interfaces,
                            mock_execute, mock_safe_decode):
        mock_get_interfaces.return_value = ["foo"]
        mock_execute.side_effect = test.TestingException('oops')

        self.assertRaises(test.TestingException, self.guest.enable_hairpin)
        self.assertEqual(1, mock_safe_decode.called)

    def test_get_interfaces(self):
        self.domain.XMLDesc.return_value = """<domain>
  <devices>
    <interface type="network">
      <target dev="vnet0"/>
    </interface>
    <interface type="network">
      <target dev="vnet1"/>
    </interface>
  </devices>
</domain>"""
        self.assertEqual(["vnet0", "vnet1"], self.guest.get_interfaces())

    def test_get_interfaces_exception(self):
        self.domain.XMLDesc.return_value = "<bad xml>"
        self.assertEqual([], self.guest.get_interfaces())

    def test_poweroff(self):
        self.guest.poweroff()
        self.domain.destroy.assert_called_once_with()

    def test_resume(self):
        self.guest.resume()
        self.domain.resume.assert_called_once_with()

    def test_get_vcpus_info(self):
        self.domain.vcpus.return_value = ([(0, 1, int(10290000000), 2)],
                                     [(True, True)])
        vcpus = list(self.guest.get_vcpus_info())
        self.assertEqual(0, vcpus[0].id)
        self.assertEqual(2, vcpus[0].cpu)
        self.assertEqual(1, vcpus[0].state)
        self.assertEqual(int(10290000000), vcpus[0].time)

    def test_delete_configuration(self):
        self.guest.delete_configuration()
        self.domain.undefineFlags.assert_called_once_with(
            fakelibvirt.VIR_DOMAIN_UNDEFINE_MANAGED_SAVE)

    def test_delete_configuration_exception(self):
        self.domain.undefineFlags.side_effect = fakelibvirt.libvirtError(
            'oops')
        self.domain.ID.return_value = 1
        self.guest.delete_configuration()
        self.domain.undefine.assert_called_once_with()

    def test_attach_device(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.attach_device(conf)
        self.domain.attachDeviceFlags.assert_called_once_with(
            "</xml>", flags=0)

    def test_attach_device_persistent(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.attach_device(conf, persistent=True)
        self.domain.attachDeviceFlags.assert_called_once_with(
            "</xml>", flags=fakelibvirt.VIR_DOMAIN_AFFECT_CONFIG)

    def test_attach_device_live(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.attach_device(conf, live=True)
        self.domain.attachDeviceFlags.assert_called_once_with(
            "</xml>", flags=fakelibvirt.VIR_DOMAIN_AFFECT_LIVE)

    def test_attach_device_persistent_live(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.attach_device(conf, persistent=True, live=True)
        self.domain.attachDeviceFlags.assert_called_once_with(
            "</xml>", flags=(fakelibvirt.VIR_DOMAIN_AFFECT_CONFIG |
                             fakelibvirt.VIR_DOMAIN_AFFECT_LIVE))

    def test_detach_device(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.detach_device(conf)
        self.domain.detachDeviceFlags.assert_called_once_with(
            "</xml>", flags=0)

    def test_detach_device_persistent(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.detach_device(conf, persistent=True)
        self.domain.detachDeviceFlags.assert_called_once_with(
            "</xml>", flags=fakelibvirt.VIR_DOMAIN_AFFECT_CONFIG)

    def test_detach_device_live(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.detach_device(conf, live=True)
        self.domain.detachDeviceFlags.assert_called_once_with(
            "</xml>", flags=fakelibvirt.VIR_DOMAIN_AFFECT_LIVE)

    def test_detach_device_persistent_live(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        self.guest.detach_device(conf, persistent=True, live=True)
        self.domain.detachDeviceFlags.assert_called_once_with(
            "</xml>", flags=(fakelibvirt.VIR_DOMAIN_AFFECT_CONFIG |
                             fakelibvirt.VIR_DOMAIN_AFFECT_LIVE))

    def test_detach_device_with_retry_detach_success(self):
        conf = mock.Mock(spec=vconfig.LibvirtConfigGuestDevice)
        conf.to_xml.return_value = "</xml>"
        get_config = mock.Mock()
        # Force multiple retries of detach
        get_config.side_effect = [conf, conf, conf, None]
        dev_path = "/dev/vdb"

        retry_detach = self.guest.detach_device_with_retry(
            get_config, dev_path, persistent=True, live=True,
            inc_sleep_time=.01)
        # Ensure we've only done the initial detach call
        self.domain.detachDeviceFlags.assert_called_once_with(
            "</xml>", flags=(fakelibvirt.VIR_DOMAIN_AFFECT_CONFIG |
                             fakelibvirt.VIR_DOMAIN_AFFECT_LIVE))

        get_config.assert_called_with(dev_path)

        # Some time later, we can do the wait/retry to ensure detach succeeds
        self.domain.detachDeviceFlags.reset_mock()
        retry_detach()
        # Should have two retries before we pretend device is detached
        self.assertEqual(2, self.domain.detachDeviceFlags.call_count)

    def test_detach_device_with_retry_detach_failure(self):