# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# 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 tests.unittest
import tests.utils


class EventFederationWorkerStoreTestCase(tests.unittest.HomeserverTestCase):
    def prepare(self, reactor, clock, hs):
        self.store = hs.get_datastore()

    def test_get_prev_events_for_room(self):
        room_id = "@ROOM:local"

        # add a bunch of events and hashes to act as forward extremities
        def insert_event(txn, i):
            event_id = "$event_%i:local" % i

            txn.execute(
                (
                    "INSERT INTO events ("
                    "   room_id, event_id, type, depth, topological_ordering,"
                    "   content, processed, outlier, stream_ordering) "
                    "VALUES (?, ?, 'm.test', ?, ?, 'test', ?, ?, ?)"
                ),
                (room_id, event_id, i, i, True, False, i),
            )

            txn.execute(
                (
                    "INSERT INTO event_forward_extremities (room_id, event_id) "
                    "VALUES (?, ?)"
                ),
                (room_id, event_id),
            )

            txn.execute(
                (
                    "INSERT INTO event_reference_hashes "
                    "(event_id, algorithm, hash) "
                    "VALUES (?, 'sha256', ?)"
                ),
                (event_id, bytearray(b"ffff")),
            )

        for i in range(0, 20):
            self.get_success(
                self.store.db_pool.runInteraction("insert", insert_event, i)
            )

        # this should get the last ten
        r = self.get_success(self.store.get_prev_events_for_room(room_id))
        self.assertEqual(10, len(r))
        for i in range(0, 10):
            self.assertEqual("$event_%i:local" % (19 - i), r[i])

    def test_get_rooms_with_many_extremities(self):
        room1 = "#room1"
        room2 = "#room2"
        room3 = "#room3"

        def insert_event(txn, i, room_id):
            event_id = "$event_%i:local" % i
            txn.execute(
                (
                    "INSERT INTO event_forward_extremities (room_id, event_id) "
                    "VALUES (?, ?)"
                ),
                (room_id, event_id),
            )

        for i in range(0, 20):
            self.get_success(
                self.store.db_pool.runInteraction("insert", insert_event, i, room1)
            )
            self.get_success(
                self.store.db_pool.runInteraction("insert", insert_event, i, room2)
            )
            self.get_success(
                self.store.db_pool.runInteraction("insert", insert_event, i, room3)
            )

        # Test simple case
        r = self.get_success(self.store.get_rooms_with_many_extremities(5, 5, []))
        self.assertEqual(len(r), 3)

        # Does filter work?

        r = self.get_success(self.store.get_rooms_with_many_extremities(5, 5, [room1]))
        self.assertTrue(room2 in r)
        self.assertTrue(room3 in r)
        self.assertEqual(len(r), 2)

        r = self.get_success(
            self.store.get_rooms_with_many_extremities(5, 5, [room1, room2])
        )
        self.assertEqual(r, [room3])

        # Does filter and limit work?

        r = self.get_success(self.store.get_rooms_with_many_extremities(5, 1, [room1]))
        self.assertTrue(r == [room2] or r == [room3])

    def test_auth_difference(self):
        room_id = "@ROOM:local"

        # The silly auth graph we use to test the auth difference algorithm,
        # where the top are the most recent events.
        #
        #   A   B
        #    \ /
        #  D  E
        #  \  |
        #   ` F   C
        #     |  /|
        #     G ´ |
        #     | \ |
        #     H   I
        #     |   |
        #     K   J

        auth_graph = {
            "a": ["e"],
            "b": ["e"],
            "c": ["g", "i"],
            "d": ["f"],
            "e": ["f"],
            "f": ["g"],
            "g": ["h", "i"],
            "h": ["k"],
            "i": ["j"],
            "k": [],
            "j": [],
        }

        depth_map = {
            "a": 7,
            "b": 7,
            "c": 4,
            "d": 6,
            "e": 6,
            "f": 5,
            "g": 3,
            "h": 2,
            "i": 2,
            "k": 1,
            "j": 1,
        }

        # We rudely fiddle with the appropriate tables directly, as that's much
        # easier than constructing events properly.

        def insert_event(txn, event_id, stream_ordering):

            depth = depth_map[event_id]

            self.store.db_pool.simple_insert_txn(
                txn,
                table="events",
                values={
                    "event_id": event_id,
                    "room_id": room_id,
                    "depth": depth,
                    "topological_ordering": depth,
                    "type": "m.test",
                    "processed": True,
                    "outlier": False,
                    "stream_ordering": stream_ordering,
                },
            )

            self.store.db_pool.simple_insert_many_txn(
                txn,
                table="event_auth",
                values=[
                    {"event_id": event_id, "room_id": room_id, "auth_id": a}
                    for a in auth_graph[event_id]
                ],
            )

        next_stream_ordering = 0
        for event_id in auth_graph:
            next_stream_ordering += 1
            self.get_success(
                self.store.db_pool.runInteraction(
                    "insert", insert_event, event_id, next_stream_ordering
                )
            )

        # Now actually test that various combinations give the right result:

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a"}, {"b"}])
        )
        self.assertSetEqual(difference, {"a", "b"})

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a"}, {"b"}, {"c"}])
        )
        self.assertSetEqual(difference, {"a", "b", "c", "e", "f"})

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a", "c"}, {"b"}])
        )
        self.assertSetEqual(difference, {"a", "b", "c"})

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a"}, {"b"}, {"d"}])
        )
        self.assertSetEqual(difference, {"a", "b", "d", "e"})

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a"}, {"b"}, {"c"}, {"d"}])
        )
        self.assertSetEqual(difference, {"a", "b", "c", "d", "e", "f"})

        difference = self.get_success(
            self.store.get_auth_chain_difference([{"a"}, {"b"}, {"e"}])
        )
        self.assertSetEqual(difference, {"a", "b"})

        difference = self.get_success(self.store.get_auth_chain_difference([{"a"}]))
        self.assertSetEqual(difference, set())
