# -*- encoding: utf-8 -*-
#
# Copyright © 2012 New Dream Network, LLC (DreamHost)
#
# Author: Doug Hellmann <doug.hellmann@dreamhost.com>
#
# 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.
"""Test listing raw events.
"""

import datetime
import logging

import mock
import testscenarios

from ceilometer.openstack.common import timeutils
from ceilometer.storage import models
from ceilometer.tests.api.v2 import FunctionalTest
from ceilometer.tests import db as tests_db


load_tests = testscenarios.load_tests_apply_scenarios

LOG = logging.getLogger(__name__)


class TestComputeDurationByResource(FunctionalTest,
                                    tests_db.MixinTestsWithBackendScenarios):

    def setUp(self):
        super(TestComputeDurationByResource, self).setUp()
        # Create events relative to the range and pretend
        # that the intervening events exist.

        self.early1 = datetime.datetime(2012, 8, 27, 7, 0)
        self.early2 = datetime.datetime(2012, 8, 27, 17, 0)

        self.start = datetime.datetime(2012, 8, 28, 0, 0)

        self.middle1 = datetime.datetime(2012, 8, 28, 8, 0)
        self.middle2 = datetime.datetime(2012, 8, 28, 18, 0)

        self.end = datetime.datetime(2012, 8, 28, 23, 59)

        self.late1 = datetime.datetime(2012, 8, 29, 9, 0)
        self.late2 = datetime.datetime(2012, 8, 29, 19, 0)

    def _patch_get_interval(self, start, end):
        def get_interval(event_filter, period, groupby, aggregate):
            assert event_filter.start
            assert event_filter.end
            if (event_filter.start > end or event_filter.end < start):
                return []
            duration_start = max(event_filter.start, start)
            duration_end = min(event_filter.end, end)
            duration = timeutils.delta_seconds(duration_start, duration_end)
            return [
                models.Statistics(
                    unit='',
                    min=0,
                    max=0,
                    avg=0,
                    sum=0,
                    count=0,
                    period=None,
                    period_start=None,
                    period_end=None,
                    duration=duration,
                    duration_start=duration_start,
                    duration_end=duration_end,
                    groupby=None,
                )
            ]
        return mock.patch.object(type(self.conn), 'get_meter_statistics',
                                 side_effect=get_interval)

    def _invoke_api(self):
        return self.get_json('/meters/instance:m1.tiny/statistics',
                             q=[{'field': 'timestamp',
                                 'op': 'ge',
                                 'value': self.start.isoformat()},
                                {'field': 'timestamp',
                                 'op': 'le',
                                 'value': self.end.isoformat()},
                                {'field': 'search_offset',
                                 'value': 10}])

    def test_before_range(self):
        with self._patch_get_interval(self.early1, self.early2):
            data = self._invoke_api()
        self.assertEqual([], data)

    def _assert_times_match(self, actual, expected):
        if actual:
            actual = timeutils.parse_isotime(actual)
        actual = actual.replace(tzinfo=None)
        self.assertEqual(expected, actual)

    def test_overlap_range_start(self):
        with self._patch_get_interval(self.early1, self.middle1):
            data = self._invoke_api()
        self._assert_times_match(data[0]['duration_start'], self.start)
        self._assert_times_match(data[0]['duration_end'], self.middle1)
        self.assertEqual(8 * 60 * 60, data[0]['duration'])

    def test_within_range(self):
        with self._patch_get_interval(self.middle1, self.middle2):
            data = self._invoke_api()
        self._assert_times_match(data[0]['duration_start'], self.middle1)
        self._assert_times_match(data[0]['duration_end'], self.middle2)
        self.assertEqual(10 * 60 * 60, data[0]['duration'])

    def test_within_range_zero_duration(self):
        with self._patch_get_interval(self.middle1, self.middle1):
            data = self._invoke_api()
        self._assert_times_match(data[0]['duration_start'], self.middle1)
        self._assert_times_match(data[0]['duration_end'], self.middle1)
        self.assertEqual(0, data[0]['duration'])

    def test_overlap_range_end(self):
        with self._patch_get_interval(self.middle2, self.late1):
            data = self._invoke_api()
        self._assert_times_match(data[0]['duration_start'], self.middle2)
        self._assert_times_match(data[0]['duration_end'], self.end)
        self.assertEqual(((6 * 60) - 1) * 60, data[0]['duration'])

    def test_after_range(self):
        with self._patch_get_interval(self.late1, self.late2):
            data = self._invoke_api()
        self.assertEqual([], data)

    def test_without_end_timestamp(self):
        statistics = [
            models.Statistics(
                unit=None,
                count=0,
                min=None,
                max=None,
                avg=None,
                duration=None,
                duration_start=self.late1,
                duration_end=self.late2,
                sum=0,
                period=None,
                period_start=None,
                period_end=None,
                groupby=None,
            )
        ]
        with mock.patch.object(type(self.conn), 'get_meter_statistics',
                               return_value=statistics):
            data = self.get_json('/meters/instance:m1.tiny/statistics',
                                 q=[{'field': 'timestamp',
                                     'op': 'ge',
                                     'value': self.late1.isoformat()},
                                    {'field': 'resource_id',
                                     'value': 'resource-id'},
                                    {'field': 'search_offset',
                                     'value': 10}])
        self._assert_times_match(data[0]['duration_start'], self.late1)
        self._assert_times_match(data[0]['duration_end'], self.late2)

    def test_without_start_timestamp(self):
        statistics = [
            models.Statistics(
                unit=None,
                count=0,
                min=None,
                max=None,
                avg=None,
                duration=None,
                duration_start=self.early1,
                duration_end=self.early2,
                sum=0,
                period=None,
                period_start=None,
                period_end=None,
                groupby=None,
            )
        ]

        with mock.patch.object(type(self.conn), 'get_meter_statistics',
                               return_value=statistics):
            data = self.get_json('/meters/instance:m1.tiny/statistics',
                                 q=[{'field': 'timestamp',
                                     'op': 'le',
                                     'value': self.early2.isoformat()},
                                    {'field': 'resource_id',
                                     'value': 'resource-id'},
                                    {'field': 'search_offset',
                                     'value': 10}])
        self._assert_times_match(data[0]['duration_start'], self.early1)
        self._assert_times_match(data[0]['duration_end'], self.early2)
