#
#    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 logging
import os
import sys
import time

import fixtures
import mox
from oslo.config import cfg
from oslotest import mockpatch
import testscenarios
import testtools

from heat.common import messaging
from heat.engine.clients.os import glance
from heat.engine.clients.os import keystone
from heat.engine import environment
from heat.engine import resources
from heat.engine.resources import nova_keypair
from heat.engine import scheduler
from heat.engine import stack
from heat.tests import fakes
from heat.tests import utils


TEST_DEFAULT_LOGLEVELS = {'migrate': logging.WARN}


class FakeLogMixin(object):
    def setup_logging(self):
        # Assign default logs to self.LOG so we can still
        # assert on heat logs.
        self.LOG = self.useFixture(
            fixtures.FakeLogger(level=logging.DEBUG))
        base_list = set([nlog.split('.')[0]
                         for nlog in logging.Logger.manager.loggerDict])
        for base in base_list:
            if base in TEST_DEFAULT_LOGLEVELS:
                self.useFixture(fixtures.FakeLogger(
                    level=TEST_DEFAULT_LOGLEVELS[base],
                    name=base))
            elif base != 'heat':
                self.useFixture(fixtures.FakeLogger(
                    name=base))


class HeatTestCase(testscenarios.WithScenarios,
                   testtools.TestCase, FakeLogMixin):

    TIME_STEP = 0.1

    def setUp(self):
        super(HeatTestCase, self).setUp()
        self.m = mox.Mox()
        self.addCleanup(self.m.UnsetStubs)
        self.setup_logging()
        scheduler.ENABLE_SLEEP = False
        self.useFixture(fixtures.MonkeyPatch(
            'heat.common.exception._FATAL_EXCEPTION_FORMAT_ERRORS',
            True))

        def enable_sleep():
            scheduler.ENABLE_SLEEP = True

        self.addCleanup(enable_sleep)

        mod_dir = os.path.dirname(sys.modules[__name__].__file__)
        project_dir = os.path.abspath(os.path.join(mod_dir, '../../'))
        env_dir = os.path.join(project_dir, 'etc', 'heat',
                               'environment.d')

        cfg.CONF.set_default('environment_dir', env_dir)
        self.addCleanup(cfg.CONF.reset)

        messaging.setup("fake://", optional=True)
        self.addCleanup(messaging.cleanup)

        tri = resources.global_env().get_resource_info(
            'AWS::RDS::DBInstance',
            registry_type=environment.TemplateResourceInfo)
        if tri is not None:
            cur_path = tri.template_name
            templ_path = os.path.join(project_dir, 'etc', 'heat', 'templates')
            if templ_path not in cur_path:
                tri.template_name = cur_path.replace('/etc/heat/templates',
                                                     templ_path)

        # use CWLiteAlarm for testing.
        resources.global_env().registry.load(
            {"AWS::CloudWatch::Alarm": "OS::Heat::CWLiteAlarm"})

        utils.setup_dummy_db()
        self.addCleanup(utils.reset_dummy_db)

        cached_wait_time = stack.ERROR_WAIT_TIME
        stack.ERROR_WAIT_TIME = None

        def replace_wait_time():
            stack.ERROR_WAIT_TIME = cached_wait_time

        self.addCleanup(replace_wait_time)

    def stub_wallclock(self):
        """
        Overrides scheduler wallclock to speed up tests expecting timeouts.
        """
        self._wallclock = time.time()

        def fake_wallclock():
            self._wallclock += self.TIME_STEP
            return self._wallclock

        self.m.StubOutWithMock(scheduler, 'wallclock')
        scheduler.wallclock = fake_wallclock

    def patchobject(self, obj, attr, **kwargs):
        mockfixture = self.useFixture(mockpatch.PatchObject(obj, attr,
                                                            **kwargs))
        return mockfixture.mock

    # NOTE(pshchelo): this overrides the testtools.TestCase.patch method
    # that does simple monkey-patching in favor of mock's patching
    def patch(self, target, **kwargs):
        mockfixture = self.useFixture(mockpatch.Patch(target, **kwargs))
        return mockfixture.mock

    def stub_keystoneclient(self, fake_client=None, **kwargs):
        client = self.patchobject(keystone.KeystoneClientPlugin, "_create")
        fkc = fake_client or fakes.FakeKeystoneClient(**kwargs)
        client.return_value = fkc
        return fkc

    def stub_KeypairConstraint_validate(self):
        self.m.StubOutWithMock(nova_keypair.KeypairConstraint, 'validate')
        nova_keypair.KeypairConstraint.validate(
            mox.IgnoreArg(), mox.IgnoreArg()).MultipleTimes().AndReturn(True)

    def stub_ImageConstraint_validate(self, num=None):
        self.m.StubOutWithMock(glance.ImageConstraint, 'validate')
        if num is None:
            glance.ImageConstraint.validate(
                mox.IgnoreArg(), mox.IgnoreArg()).MultipleTimes().\
                AndReturn(True)
        else:
            for x in range(num):
                glance.ImageConstraint.validate(
                    mox.IgnoreArg(), mox.IgnoreArg()).AndReturn(True)