# Copyright 2017-present MongoDB, 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.

"""Test ClientSession support with asyncio."""

import asyncio
import copy
import sys
import unittest

from pymongo import InsertOne, IndexModel
from pymongo.errors import InvalidOperation

from test import SkipTest
from test.asyncio_tests import AsyncIOTestCase, asyncio_test
from test.test_environment import env
from test.utils import TestListener, session_ids


class TestAsyncIOSession(AsyncIOTestCase):
    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        if not env.sessions_enabled:
            raise SkipTest("Sessions not supported")

    async def _test_ops(self, client, *ops):
        listener = client.event_listeners()[0][0]

        for f, args, kw in ops:
            s = await client.start_session()
            # Simulate "async with" on Python 3.4.
            try:
                listener.results.clear()
                # In case "f" modifies its inputs.
                args2 = copy.copy(args)
                kw2 = copy.copy(kw)
                kw2['session'] = s
                await f(*args2, **kw2)
                for event in listener.results['started']:
                    self.assertTrue(
                        'lsid' in event.command,
                        "%s sent no lsid with %s" % (
                            f.__name__, event.command_name))

                    self.assertEqual(
                        s.session_id,
                        event.command['lsid'],
                        "%s sent wrong lsid with %s" % (
                            f.__name__, event.command_name))

                self.assertFalse(s.has_ended)
            finally:
                await s.end_session()

            with self.assertRaisesRegex(InvalidOperation, "ended session"):
                await f(*args2, **kw2)

        # No explicit session.
        for f, args, kw in ops:
            listener.results.clear()
            await f(*args, **kw)
            self.assertGreaterEqual(len(listener.results['started']), 1)
            lsids = []
            for event in listener.results['started']:
                self.assertTrue(
                    'lsid' in event.command,
                    "%s sent no lsid with %s" % (
                        f.__name__, event.command_name))

                lsids.append(event.command['lsid'])

            if 'PyPy' not in sys.version:
                # Server session was returned to pool. Ignore interpreters with
                # non-deterministic GC.
                for lsid in lsids:
                    self.assertIn(
                        lsid, session_ids(client),
                        "%s did not return implicit session to pool" % (
                            f.__name__,))

    @asyncio_test
    async def test_database(self):
        listener = TestListener()
        client = self.asyncio_client(event_listeners=[listener])

        db = client.pymongo_test
        ops = [
            (db.command, ['ping'], {}),
            (db.drop_collection, ['collection'], {}),
            (db.create_collection, ['collection'], {}),
            (db.list_collection_names, [], {}),
        ]

        await self._test_ops(client, *ops)

    @asyncio_test(timeout=30)
    async def test_collection(self):
        listener = TestListener()
        client = self.asyncio_client(event_listeners=[listener])
        await client.drop_database('motor_test')

        coll = client.motor_test.test_collection

        async def list_indexes(session=None):
            await coll.list_indexes(session=session).to_list(length=None)


        async def aggregate(session=None):
            await coll.aggregate([], session=session).to_list(length=None)

        # Test some collection methods - the rest are in test_cursor.
        await self._test_ops(
            client,
            (coll.drop, [], {}),
            (coll.bulk_write, [[InsertOne({})]], {}),
            (coll.insert_one, [{}], {}),
            (coll.insert_many, [[{}, {}]], {}),
            (coll.replace_one, [{}, {}], {}),
            (coll.update_one, [{}, {'$set': {'a': 1}}], {}),
            (coll.update_many, [{}, {'$set': {'a': 1}}], {}),
            (coll.delete_one, [{}], {}),
            (coll.delete_many, [{}], {}),
            (coll.find_one_and_replace, [{}, {}], {}),
            (coll.find_one_and_update, [{}, {'$set': {'a': 1}}], {}),
            (coll.find_one_and_delete, [{}, {}], {}),
            (coll.rename, ['collection2'], {}),
            # Drop collection2 between tests of "rename", above.
            (client.motor_test.drop_collection, ['collection2'], {}),
            (coll.distinct, ['a'], {}),
            (coll.find_one, [], {}),
            (coll.count_documents, [{}], {}),
            (coll.create_indexes, [[IndexModel('a')]], {}),
            (coll.create_index, ['a'], {}),
            (coll.drop_index, ['a_1'], {}),
            (coll.drop_indexes, [], {}),
            (list_indexes, [], {}),
            (coll.index_information, [], {}),
            (coll.options, [], {}),
            (aggregate, [], {}))

    @asyncio_test
    async def test_cursor(self):
        listener = TestListener()
        client = self.asyncio_client(event_listeners=[listener])
        await self.make_test_data()

        coll = client.motor_test.test_collection

        s = await client.start_session()
        # Simulate "async with" on Python 3.4.
        try:
            listener.results.clear()
            cursor = coll.find(session=s)
            await cursor.to_list(length=None)
            self.assertEqual(len(listener.results['started']), 2)
            for event in listener.results['started']:
                self.assertTrue(
                    'lsid' in event.command,
                    "find sent no lsid with %s" % (event.command_name,))

                self.assertEqual(
                    s.session_id,
                    event.command['lsid'],
                    "find sent wrong lsid with %s" % (event.command_name,))
        finally:
            await s.end_session()

        with self.assertRaisesRegex(InvalidOperation, "ended session"):
            await coll.find(session=s).to_list(length=None)

        # No explicit session.
        listener.results.clear()
        cursor = coll.find()
        await cursor.to_list(length=None)
        self.assertEqual(len(listener.results['started']), 2)
        event0 = listener.first_command_started()
        self.assertTrue(
            'lsid' in event0.command,
            "find sent no lsid with %s" % (event0.command_name,))

        lsid = event0.command['lsid']

        for event in listener.results['started'][1:]:
            self.assertTrue(
                'lsid' in event.command,
                "find sent no lsid with %s" % (event.command_name,))

            self.assertEqual(
                lsid,
                event.command['lsid'],
                "find sent wrong lsid with %s" % (event.command_name,))


if __name__ == '__main__':
    unittest.main()