#
#    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 copy
import json

from ceilometerclient import exc as ceilometerclient_exc
import mock
import mox
from oslo_config import cfg
import six

from heat.common import exception
from heat.common import template_format
from heat.engine.clients.os import ceilometer
from heat.engine import parser
from heat.engine import properties as props
from heat.engine import resource
from heat.engine.resources.openstack.ceilometer import alarm
from heat.engine import rsrc_defn
from heat.engine import scheduler
from heat.tests import common
from heat.tests import generic_resource
from heat.tests import utils


alarm_template = '''
{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Description" : "Alarm Test",
  "Parameters" : {},
  "Resources" : {
    "MEMAlarmHigh": {
     "Type": "OS::Ceilometer::Alarm",
     "Properties": {
        "description": "Scale-up if MEM > 50% for 1 minute",
        "meter_name": "MemoryUtilization",
        "statistic": "avg",
        "period": "60",
        "evaluation_periods": "1",
        "threshold": "50",
        "alarm_actions": [],
        "matching_metadata": {},
        "comparison_operator": "gt"
      }
    },
    "signal_handler" : {
      "Type" : "SignalResourceType"
    }
  }
}
'''

not_string_alarm_template = '''
{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Description" : "Alarm Test",
  "Parameters" : {},
  "Resources" : {
    "MEMAlarmHigh": {
     "Type": "OS::Ceilometer::Alarm",
     "Properties": {
        "description": "Scale-up if MEM > 50% for 1 minute",
        "meter_name": "MemoryUtilization",
        "statistic": "avg",
        "period": 60,
        "evaluation_periods": 1,
        "threshold": 50,
        "alarm_actions": [],
        "matching_metadata": {},
        "comparison_operator": "gt"
      }
    },
    "signal_handler" : {
      "Type" : "SignalResourceType"
    }
  }
}
'''

combination_alarm_template = '''
{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Description" : "Combination Alarm Test",
  "Resources" : {
    "CombinAlarm": {
     "Type": "OS::Ceilometer::CombinationAlarm",
     "Properties": {
        "description": "Do stuff in combination",
        "alarm_ids": ["alarm1", "alarm2"],
        "operator": "and",
        "alarm_actions": [],
      }
    }
  }
}
'''


class FakeCeilometerAlarm(object):
    alarm_id = 'foo'


class CeilometerAlarmTest(common.HeatTestCase):
    def setUp(self):
        super(CeilometerAlarmTest, self).setUp()

        resource._register_class('SignalResourceType',
                                 generic_resource.SignalResource)

        cfg.CONF.set_default('heat_waitcondition_server_url',
                             'http://server.test:8000/v1/waitcondition')

        self.fa = mock.Mock()

    def create_stack(self, template=None):
        if template is None:
            template = alarm_template
        temp = template_format.parse(template)
        template = parser.Template(temp)
        ctx = utils.dummy_context()
        ctx.tenant_id = 'test_tenant'
        stack = parser.Stack(ctx, utils.random_name(), template,
                             disable_rollback=True)
        stack.store()

        self.m.StubOutWithMock(alarm.CeilometerAlarm, 'ceilometer')
        alarm.CeilometerAlarm.ceilometer().MultipleTimes().AndReturn(
            self.fa)

        al = copy.deepcopy(temp['Resources']['MEMAlarmHigh']['Properties'])
        al['description'] = mox.IgnoreArg()
        al['name'] = mox.IgnoreArg()
        al['alarm_actions'] = mox.IgnoreArg()
        al['insufficient_data_actions'] = None
        al['ok_actions'] = None
        al['repeat_actions'] = True
        al['enabled'] = True
        rule = dict(
            period=60,
            evaluation_periods=1,
            threshold=50)
        for field in ['period', 'evaluation_periods', 'threshold']:
            del al[field]
        for field in ['statistic', 'comparison_operator', 'meter_name']:
            rule[field] = al[field]
            del al[field]
        if 'query' in al and al['query']:
            query = al['query']
        else:
            query = []
        if 'query' in al:
            del al['query']
        if 'matching_metadata' in al and al['matching_metadata']:
            for k, v in al['matching_metadata'].items():
                key = 'metadata.metering.' + k
                query.append(dict(field=key, op='eq', value=six.text_type(v)))
        if 'matching_metadata' in al:
            del al['matching_metadata']
        if query:
            rule['query'] = query
        al['threshold_rule'] = rule
        al['type'] = 'threshold'
        self.m.StubOutWithMock(self.fa.alarms, 'create')
        self.fa.alarms.create(**al).AndReturn(FakeCeilometerAlarm())
        return stack

    def test_mem_alarm_high_update_no_replace(self):
        '''
        Make sure that we can change the update-able properties
        without replacing the Alarm rsrc.
        '''
        # short circuit the alarm's references
        t = template_format.parse(alarm_template)
        properties = t['Resources']['MEMAlarmHigh']['Properties']
        properties['alarm_actions'] = ['signal_handler']
        properties['matching_metadata'] = {'a': 'v'}
        properties['query'] = [dict(field='b', op='eq', value='w')]

        self.stack = self.create_stack(template=json.dumps(t))
        self.m.StubOutWithMock(self.fa.alarms, 'update')
        schema = props.schemata(alarm.CeilometerAlarm.properties_schema)
        exns = ['period', 'evaluation_periods', 'threshold',
                'statistic', 'comparison_operator', 'meter_name',
                'matching_metadata', 'query']
        al2 = dict((k, mox.IgnoreArg())
                   for k, s in schema.items()
                   if s.update_allowed and k not in exns)
        al2['alarm_id'] = mox.IgnoreArg()
        al2['type'] = 'threshold'
        al2['threshold_rule'] = dict(
            meter_name=properties['meter_name'],
            period=90,
            evaluation_periods=2,
            threshold=39,
            statistic='max',
            comparison_operator='lt',
            query=[
                dict(field='c', op='ne', value='z'),
                dict(field='metadata.metering.x', op='eq', value='y')
            ])
        self.fa.alarms.update(**al2).AndReturn(None)

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']

        properties = copy.copy(rsrc.properties.data)
        properties.update({
            'comparison_operator': 'lt',
            'description': 'fruity',
            'evaluation_periods': '2',
            'period': '90',
            'enabled': True,
            'repeat_actions': True,
            'statistic': 'max',
            'threshold': '39',
            'insufficient_data_actions': [],
            'alarm_actions': [],
            'ok_actions': ['signal_handler'],
            'matching_metadata': {'x': 'y'},
            'query': [dict(field='c', op='ne', value='z')]
        })
        snippet = rsrc_defn.ResourceDefinition(rsrc.name,
                                               rsrc.type(),
                                               properties)

        scheduler.TaskRunner(rsrc.update, snippet)()

        self.m.VerifyAll()

    def test_mem_alarm_high_update_replace(self):
        '''
        Make sure that the Alarm resource IS replaced when non-update-able
        properties are changed.
        '''
        t = template_format.parse(alarm_template)
        properties = t['Resources']['MEMAlarmHigh']['Properties']
        properties['alarm_actions'] = ['signal_handler']
        properties['matching_metadata'] = {'a': 'v'}

        self.stack = self.create_stack(template=json.dumps(t))

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']

        properties = copy.copy(rsrc.properties.data)
        properties['meter_name'] = 'temp'
        snippet = rsrc_defn.ResourceDefinition(rsrc.name,
                                               rsrc.type(),
                                               properties)

        updater = scheduler.TaskRunner(rsrc.update, snippet)
        self.assertRaises(resource.UpdateReplace, updater)

        self.m.VerifyAll()

    def test_mem_alarm_suspend_resume(self):
        """
        Make sure that the Alarm resource gets disabled on suspend
        and reenabled on resume.
        """
        self.stack = self.create_stack()

        self.m.StubOutWithMock(self.fa.alarms, 'update')
        al_suspend = {'alarm_id': mox.IgnoreArg(),
                      'enabled': False}
        self.fa.alarms.update(**al_suspend).AndReturn(None)
        al_resume = {'alarm_id': mox.IgnoreArg(),
                     'enabled': True}
        self.fa.alarms.update(**al_resume).AndReturn(None)
        self.m.ReplayAll()

        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']
        scheduler.TaskRunner(rsrc.suspend)()
        self.assertEqual((rsrc.SUSPEND, rsrc.COMPLETE), rsrc.state)
        scheduler.TaskRunner(rsrc.resume)()
        self.assertEqual((rsrc.RESUME, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def test_mem_alarm_high_correct_int_parameters(self):
        self.stack = self.create_stack(not_string_alarm_template)

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']
        self.assertEqual((rsrc.CREATE, rsrc.COMPLETE), rsrc.state)
        self.assertIsNone(rsrc.validate())

        self.assertIsInstance(rsrc.properties['evaluation_periods'], int)
        self.assertIsInstance(rsrc.properties['period'], int)
        self.assertIsInstance(rsrc.properties['threshold'], int)

        self.m.VerifyAll()

    def test_alarm_metadata_prefix(self):
        t = template_format.parse(alarm_template)
        properties = t['Resources']['MEMAlarmHigh']['Properties']
        # Test for bug/1383521, where meter_name is in NOVA_METERS
        properties[alarm.CeilometerAlarm.METER_NAME] = 'memory.usage'
        properties['matching_metadata'] = {'metadata.user_metadata.groupname':
                                           'foo'}

        self.stack = self.create_stack(template=json.dumps(t))

        rsrc = self.stack['MEMAlarmHigh']
        rsrc.properties.data = rsrc.cfn_to_ceilometer(self.stack, properties)
        self.assertIsNone(rsrc.properties.data.get('matching_metadata'))
        query = rsrc.properties.data['threshold_rule']['query']
        expected_query = [{'field': u'metadata.user_metadata.groupname',
                           'value': u'foo', 'op': 'eq'}]
        self.assertEqual(expected_query, query)

    def test_mem_alarm_high_correct_matching_metadata(self):
        t = template_format.parse(alarm_template)
        properties = t['Resources']['MEMAlarmHigh']['Properties']
        properties['matching_metadata'] = {'fro': 'bar',
                                           'bro': True,
                                           'dro': 1234,
                                           'pro': '{"Mem": {"Ala": {"Hig"}}}',
                                           'tro': [1, 2, 3, 4]}

        self.stack = self.create_stack(template=json.dumps(t))

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']
        self.assertEqual((rsrc.CREATE, rsrc.COMPLETE), rsrc.state)
        rsrc.properties.data = rsrc.cfn_to_ceilometer(self.stack, properties)
        self.assertIsNone(rsrc.properties.data.get('matching_metadata'))
        for key in rsrc.properties.data['threshold_rule']['query']:
            self.assertIsInstance(key['value'], six.text_type)

        self.m.VerifyAll()

    def test_no_matching_metadata(self):
        """Make sure that we can pass in an empty matching_metadata."""

        t = template_format.parse(alarm_template)
        properties = t['Resources']['MEMAlarmHigh']['Properties']
        properties['alarm_actions'] = ['signal_handler']
        del properties['matching_metadata']

        self.stack = self.create_stack(template=json.dumps(t))

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']
        self.assertEqual((rsrc.CREATE, rsrc.COMPLETE), rsrc.state)
        self.assertIsNone(rsrc.validate())

        self.m.VerifyAll()

    def test_mem_alarm_high_not_correct_string_parameters(self):
        snippet = template_format.parse(not_string_alarm_template)
        for p in ('period', 'evaluation_periods'):
            snippet['Resources']['MEMAlarmHigh']['Properties'][p] = '60a'
            stack = utils.parse_stack(snippet)

            resource_defns = stack.t.resource_definitions(stack)
            rsrc = alarm.CeilometerAlarm(
                'MEMAlarmHigh', resource_defns['MEMAlarmHigh'], stack)
            error = self.assertRaises(exception.StackValidationFailed,
                                      rsrc.validate)
            self.assertEqual(
                "Property error : MEMAlarmHigh: %s Value '60a' is not an "
                "integer" % p, six.text_type(error))

    def test_mem_alarm_high_not_integer_parameters(self):
        snippet = template_format.parse(not_string_alarm_template)
        for p in ('period', 'evaluation_periods'):
            snippet['Resources']['MEMAlarmHigh']['Properties'][p] = [60]
            stack = utils.parse_stack(snippet)

            resource_defns = stack.t.resource_definitions(stack)
            rsrc = alarm.CeilometerAlarm(
                'MEMAlarmHigh', resource_defns['MEMAlarmHigh'], stack)
            error = self.assertRaises(exception.StackValidationFailed,
                                      rsrc.validate)
            self.assertEqual(
                "Property error : MEMAlarmHigh: %s int() argument must be "
                "a string or a number, not 'list'" % p, six.text_type(error))

    def test_mem_alarm_high_check_not_required_parameters(self):
        snippet = template_format.parse(not_string_alarm_template)
        snippet['Resources']['MEMAlarmHigh']['Properties'].pop('meter_name')
        stack = utils.parse_stack(snippet)

        resource_defns = stack.t.resource_definitions(stack)
        rsrc = alarm.CeilometerAlarm(
            'MEMAlarmHigh', resource_defns['MEMAlarmHigh'], stack)
        error = self.assertRaises(exception.StackValidationFailed,
                                  rsrc.validate)
        self.assertEqual(
            "Property error : MEMAlarmHigh: Property meter_name not assigned",
            six.text_type(error))

        for p in ('period', 'evaluation_periods', 'statistic',
                  'comparison_operator'):
            snippet = template_format.parse(not_string_alarm_template)
            snippet['Resources']['MEMAlarmHigh']['Properties'].pop(p)
            stack = utils.parse_stack(snippet)

            resource_defns = stack.t.resource_definitions(stack)
            rsrc = alarm.CeilometerAlarm(
                'MEMAlarmHigh', resource_defns['MEMAlarmHigh'], stack)
            self.assertIsNone(rsrc.validate())

    def test_delete_alarm_not_found(self):
        t = template_format.parse(alarm_template)

        self.stack = self.create_stack(template=json.dumps(t))
        self.m.StubOutWithMock(self.fa.alarms, 'delete')
        self.fa.alarms.delete('foo').AndRaise(
            ceilometerclient_exc.HTTPNotFound())

        self.m.ReplayAll()
        self.stack.create()
        rsrc = self.stack['MEMAlarmHigh']

        scheduler.TaskRunner(rsrc.delete)()
        self.assertEqual((rsrc.DELETE, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def _prepare_check_resource(self):
        snippet = template_format.parse(not_string_alarm_template)
        stack = utils.parse_stack(snippet)
        res = stack['MEMAlarmHigh']
        res.ceilometer = mock.Mock()
        mock_alarm = mock.Mock(enabled=True, state='ok')
        res.ceilometer().alarms.get.return_value = mock_alarm
        return res

    @mock.patch.object(alarm.watchrule.WatchRule, 'load')
    def test_check(self, mock_load):
        res = self._prepare_check_resource()
        scheduler.TaskRunner(res.check)()
        self.assertEqual((res.CHECK, res.COMPLETE), res.state)

    @mock.patch.object(alarm.watchrule.WatchRule, 'load')
    def test_check_watchrule_failure(self, mock_load):
        res = self._prepare_check_resource()
        exc = alarm.exception.WatchRuleNotFound(watch_name='Boom')
        mock_load.side_effect = exc

        self.assertRaises(exception.ResourceFailure,
                          scheduler.TaskRunner(res.check))
        self.assertEqual((res.CHECK, res.FAILED), res.state)
        self.assertIn('Boom', res.status_reason)

    @mock.patch.object(alarm.watchrule.WatchRule, 'load')
    def test_check_alarm_failure(self, mock_load):
        res = self._prepare_check_resource()
        res.ceilometer().alarms.get.side_effect = Exception('Boom')

        self.assertRaises(exception.ResourceFailure,
                          scheduler.TaskRunner(res.check))
        self.assertEqual((res.CHECK, res.FAILED), res.state)
        self.assertIn('Boom', res.status_reason)


class CombinationAlarmTest(common.HeatTestCase):

    def setUp(self):
        super(CombinationAlarmTest, self).setUp()
        self.fc = mock.Mock()
        self.m.StubOutWithMock(ceilometer.CeilometerClientPlugin, '_create')

    def create_alarm(self):
        ceilometer.CeilometerClientPlugin._create().AndReturn(
            self.fc)
        self.m.StubOutWithMock(self.fc.alarms, 'create')
        self.fc.alarms.create(
            alarm_actions=[],
            description=u'Do stuff in combination',
            enabled=True,
            insufficient_data_actions=None,
            ok_actions=None,
            name=mox.IgnoreArg(), type='combination',
            repeat_actions=True,
            combination_rule={'alarm_ids': [u'alarm1', u'alarm2'],
                              'operator': u'and'}
        ).AndReturn(FakeCeilometerAlarm())
        snippet = template_format.parse(combination_alarm_template)
        stack = utils.parse_stack(snippet)
        resource_defns = stack.t.resource_definitions(stack)
        return alarm.CombinationAlarm(
            'CombinAlarm', resource_defns['CombinAlarm'], stack)

    def test_create(self):
        rsrc = self.create_alarm()

        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()
        self.assertEqual((rsrc.CREATE, rsrc.COMPLETE), rsrc.state)
        self.assertEqual('foo', rsrc.resource_id)
        self.m.VerifyAll()

    def test_invalid_alarm_list(self):
        snippet = template_format.parse(combination_alarm_template)
        snippet['Resources']['CombinAlarm']['Properties']['alarm_ids'] = []
        stack = utils.parse_stack(snippet)
        resource_defns = stack.t.resource_definitions(stack)
        rsrc = alarm.CombinationAlarm(
            'CombinAlarm', resource_defns['CombinAlarm'], stack)
        error = self.assertRaises(exception.StackValidationFailed,
                                  rsrc.validate)
        self.assertEqual(
            "Property error : CombinAlarm: alarm_ids length (0) is out of "
            "range (min: 1, max: None)", six.text_type(error))

    def test_update(self):
        rsrc = self.create_alarm()
        self.m.StubOutWithMock(self.fc.alarms, 'update')
        self.fc.alarms.update(
            alarm_id='foo',
            combination_rule={'alarm_ids': [u'alarm1', u'alarm3']})

        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()

        update_template = copy.deepcopy(rsrc.t)
        update_template['Properties']['alarm_ids'] = ['alarm1', 'alarm3']
        scheduler.TaskRunner(rsrc.update, update_template)()
        self.assertEqual((rsrc.UPDATE, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def test_suspend(self):
        rsrc = self.create_alarm()
        self.m.StubOutWithMock(self.fc.alarms, 'update')
        self.fc.alarms.update(alarm_id='foo', enabled=False)

        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()

        scheduler.TaskRunner(rsrc.suspend)()
        self.assertEqual((rsrc.SUSPEND, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def test_resume(self):
        rsrc = self.create_alarm()
        self.m.StubOutWithMock(self.fc.alarms, 'update')
        self.fc.alarms.update(alarm_id='foo', enabled=True)

        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()
        rsrc.state_set(rsrc.SUSPEND, rsrc.COMPLETE)

        scheduler.TaskRunner(rsrc.resume)()
        self.assertEqual((rsrc.RESUME, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def test_delete(self):
        rsrc = self.create_alarm()
        self.m.StubOutWithMock(self.fc.alarms, 'delete')
        self.fc.alarms.delete('foo')
        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()
        scheduler.TaskRunner(rsrc.delete)()
        self.assertEqual((rsrc.DELETE, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def test_delete_not_found(self):
        rsrc = self.create_alarm()
        self.m.StubOutWithMock(self.fc.alarms, 'delete')
        self.fc.alarms.delete('foo').AndRaise(
            ceilometerclient_exc.HTTPNotFound())
        self.m.ReplayAll()
        scheduler.TaskRunner(rsrc.create)()
        scheduler.TaskRunner(rsrc.delete)()
        self.assertEqual((rsrc.DELETE, rsrc.COMPLETE), rsrc.state)

        self.m.VerifyAll()

    def _prepare_check_resource(self):
        snippet = template_format.parse(combination_alarm_template)
        stack = utils.parse_stack(snippet)
        res = stack['CombinAlarm']
        res.ceilometer = mock.Mock()
        mock_alarm = mock.Mock(enabled=True, state='ok')
        res.ceilometer().alarms.get.return_value = mock_alarm
        return res

    def test_check(self):
        res = self._prepare_check_resource()
        scheduler.TaskRunner(res.check)()
        self.assertEqual((res.CHECK, res.COMPLETE), res.state)

    def test_check_failure(self):
        res = self._prepare_check_resource()
        res.ceilometer().alarms.get.side_effect = Exception('Boom')

        self.assertRaises(exception.ResourceFailure,
                          scheduler.TaskRunner(res.check))
        self.assertEqual((res.CHECK, res.FAILED), res.state)
        self.assertIn('Boom', res.status_reason)
