# Copyright 2020 Dirk Klimpel
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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 json
from typing import Any, Dict, List, Optional

import synapse.rest.admin
from synapse.api.errors import Codes
from synapse.rest.client import login

from tests import unittest
from tests.test_utils import SMALL_PNG


class UserMediaStatisticsTestCase(unittest.HomeserverTestCase):
    servlets = [
        synapse.rest.admin.register_servlets,
        login.register_servlets,
    ]

    def prepare(self, reactor, clock, hs):
        self.media_repo = hs.get_media_repository_resource()

        self.admin_user = self.register_user("admin", "pass", admin=True)
        self.admin_user_tok = self.login("admin", "pass")

        self.other_user = self.register_user("user", "pass")
        self.other_user_tok = self.login("user", "pass")

        self.url = "/_synapse/admin/v1/statistics/users/media"

    def test_no_auth(self):
        """
        Try to list users without authentication.
        """
        channel = self.make_request("GET", self.url, b"{}")

        self.assertEqual(401, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.MISSING_TOKEN, channel.json_body["errcode"])

    def test_requester_is_no_admin(self):
        """
        If the user is not a server admin, an error 403 is returned.
        """
        channel = self.make_request(
            "GET",
            self.url,
            json.dumps({}),
            access_token=self.other_user_tok,
        )

        self.assertEqual(403, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])

    def test_invalid_parameter(self):
        """
        If parameters are invalid, an error is returned.
        """
        # unkown order_by
        channel = self.make_request(
            "GET",
            self.url + "?order_by=bar",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # negative from
        channel = self.make_request(
            "GET",
            self.url + "?from=-5",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # negative limit
        channel = self.make_request(
            "GET",
            self.url + "?limit=-5",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # negative from_ts
        channel = self.make_request(
            "GET",
            self.url + "?from_ts=-1234",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # negative until_ts
        channel = self.make_request(
            "GET",
            self.url + "?until_ts=-1234",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # until_ts smaller from_ts
        channel = self.make_request(
            "GET",
            self.url + "?from_ts=10&until_ts=5",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # empty search term
        channel = self.make_request(
            "GET",
            self.url + "?search_term=",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

        # invalid search order
        channel = self.make_request(
            "GET",
            self.url + "?dir=bar",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(Codes.INVALID_PARAM, channel.json_body["errcode"])

    def test_limit(self):
        """
        Testing list of media with limit
        """
        self._create_users_with_media(10, 2)

        channel = self.make_request(
            "GET",
            self.url + "?limit=5",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 10)
        self.assertEqual(len(channel.json_body["users"]), 5)
        self.assertEqual(channel.json_body["next_token"], 5)
        self._check_fields(channel.json_body["users"])

    def test_from(self):
        """
        Testing list of media with a defined starting point (from)
        """
        self._create_users_with_media(20, 2)

        channel = self.make_request(
            "GET",
            self.url + "?from=5",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 20)
        self.assertEqual(len(channel.json_body["users"]), 15)
        self.assertNotIn("next_token", channel.json_body)
        self._check_fields(channel.json_body["users"])

    def test_limit_and_from(self):
        """
        Testing list of media with a defined starting point and limit
        """
        self._create_users_with_media(20, 2)

        channel = self.make_request(
            "GET",
            self.url + "?from=5&limit=10",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 20)
        self.assertEqual(channel.json_body["next_token"], 15)
        self.assertEqual(len(channel.json_body["users"]), 10)
        self._check_fields(channel.json_body["users"])

    def test_next_token(self):
        """
        Testing that `next_token` appears at the right place
        """

        number_users = 20
        self._create_users_with_media(number_users, 3)

        #  `next_token` does not appear
        # Number of results is the number of entries
        channel = self.make_request(
            "GET",
            self.url + "?limit=20",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], number_users)
        self.assertEqual(len(channel.json_body["users"]), number_users)
        self.assertNotIn("next_token", channel.json_body)

        #  `next_token` does not appear
        # Number of max results is larger than the number of entries
        channel = self.make_request(
            "GET",
            self.url + "?limit=21",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], number_users)
        self.assertEqual(len(channel.json_body["users"]), number_users)
        self.assertNotIn("next_token", channel.json_body)

        #  `next_token` does appear
        # Number of max results is smaller than the number of entries
        channel = self.make_request(
            "GET",
            self.url + "?limit=19",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], number_users)
        self.assertEqual(len(channel.json_body["users"]), 19)
        self.assertEqual(channel.json_body["next_token"], 19)

        # Set `from` to value of `next_token` for request remaining entries
        # Check `next_token` does not appear
        channel = self.make_request(
            "GET",
            self.url + "?from=19",
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], number_users)
        self.assertEqual(len(channel.json_body["users"]), 1)
        self.assertNotIn("next_token", channel.json_body)

    def test_no_media(self):
        """
        Tests that a normal lookup for statistics is successfully
        if users have no media created
        """

        channel = self.make_request(
            "GET",
            self.url,
            access_token=self.admin_user_tok,
        )

        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(0, channel.json_body["total"])
        self.assertEqual(0, len(channel.json_body["users"]))

    def test_order_by(self):
        """
        Testing order list with parameter `order_by`
        """

        # create users
        self.register_user("user_a", "pass", displayname="UserZ")
        userA_tok = self.login("user_a", "pass")
        self._create_media(userA_tok, 1)

        self.register_user("user_b", "pass", displayname="UserY")
        userB_tok = self.login("user_b", "pass")
        self._create_media(userB_tok, 3)

        self.register_user("user_c", "pass", displayname="UserX")
        userC_tok = self.login("user_c", "pass")
        self._create_media(userC_tok, 2)

        # order by user_id
        self._order_test("user_id", ["@user_a:test", "@user_b:test", "@user_c:test"])
        self._order_test(
            "user_id",
            ["@user_a:test", "@user_b:test", "@user_c:test"],
            "f",
        )
        self._order_test(
            "user_id",
            ["@user_c:test", "@user_b:test", "@user_a:test"],
            "b",
        )

        # order by displayname
        self._order_test(
            "displayname", ["@user_c:test", "@user_b:test", "@user_a:test"]
        )
        self._order_test(
            "displayname",
            ["@user_c:test", "@user_b:test", "@user_a:test"],
            "f",
        )
        self._order_test(
            "displayname",
            ["@user_a:test", "@user_b:test", "@user_c:test"],
            "b",
        )

        # order by media_length
        self._order_test(
            "media_length",
            ["@user_a:test", "@user_c:test", "@user_b:test"],
        )
        self._order_test(
            "media_length",
            ["@user_a:test", "@user_c:test", "@user_b:test"],
            "f",
        )
        self._order_test(
            "media_length",
            ["@user_b:test", "@user_c:test", "@user_a:test"],
            "b",
        )

        # order by media_count
        self._order_test(
            "media_count",
            ["@user_a:test", "@user_c:test", "@user_b:test"],
        )
        self._order_test(
            "media_count",
            ["@user_a:test", "@user_c:test", "@user_b:test"],
            "f",
        )
        self._order_test(
            "media_count",
            ["@user_b:test", "@user_c:test", "@user_a:test"],
            "b",
        )

    def test_from_until_ts(self):
        """
        Testing filter by time with parameters `from_ts` and `until_ts`
        """
        # create media earlier than `ts1` to ensure that `from_ts` is working
        self._create_media(self.other_user_tok, 3)
        self.pump(1)
        ts1 = self.clock.time_msec()

        # list all media when filter is not set
        channel = self.make_request(
            "GET",
            self.url,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["users"][0]["media_count"], 3)

        # filter media starting at `ts1` after creating first media
        # result is 0
        channel = self.make_request(
            "GET",
            self.url + "?from_ts=%s" % (ts1,),
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 0)

        self._create_media(self.other_user_tok, 3)
        self.pump(1)
        ts2 = self.clock.time_msec()
        # create media after `ts2` to ensure that `until_ts` is working
        self._create_media(self.other_user_tok, 3)

        # filter media between `ts1` and `ts2`
        channel = self.make_request(
            "GET",
            self.url + "?from_ts=%s&until_ts=%s" % (ts1, ts2),
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["users"][0]["media_count"], 3)

        # filter media until `ts2` and earlier
        channel = self.make_request(
            "GET",
            self.url + "?until_ts=%s" % (ts2,),
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["users"][0]["media_count"], 6)

    def test_search_term(self):
        self._create_users_with_media(20, 1)

        # check without filter get all users
        channel = self.make_request(
            "GET",
            self.url,
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 20)

        # filter user 1 and 10-19 by `user_id`
        channel = self.make_request(
            "GET",
            self.url + "?search_term=foo_user_1",
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 11)

        # filter on this user in `displayname`
        channel = self.make_request(
            "GET",
            self.url + "?search_term=bar_user_10",
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["users"][0]["displayname"], "bar_user_10")
        self.assertEqual(channel.json_body["total"], 1)

        # filter and get empty result
        channel = self.make_request(
            "GET",
            self.url + "?search_term=foobar",
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
        self.assertEqual(channel.json_body["total"], 0)

    def _create_users_with_media(self, number_users: int, media_per_user: int):
        """
        Create a number of users with a number of media
        Args:
            number_users: Number of users to be created
            media_per_user: Number of media to be created for each user
        """
        for i in range(number_users):
            self.register_user("foo_user_%s" % i, "pass", displayname="bar_user_%s" % i)
            user_tok = self.login("foo_user_%s" % i, "pass")
            self._create_media(user_tok, media_per_user)

    def _create_media(self, user_token: str, number_media: int):
        """
        Create a number of media for a specific user
        Args:
            user_token: Access token of the user
            number_media: Number of media to be created for the user
        """
        upload_resource = self.media_repo.children[b"upload"]
        for _ in range(number_media):
            # Upload some media into the room
            self.helper.upload_media(
                upload_resource, SMALL_PNG, tok=user_token, expect_code=200
            )

    def _check_fields(self, content: List[Dict[str, Any]]):
        """Checks that all attributes are present in content
        Args:
            content: List that is checked for content
        """
        for c in content:
            self.assertIn("user_id", c)
            self.assertIn("displayname", c)
            self.assertIn("media_count", c)
            self.assertIn("media_length", c)

    def _order_test(
        self, order_type: str, expected_user_list: List[str], dir: Optional[str] = None
    ):
        """Request the list of users in a certain order. Assert that order is what
        we expect
        Args:
            order_type: The type of ordering to give the server
            expected_user_list: The list of user_ids in the order we expect to get
                back from the server
            dir: The direction of ordering to give the server
        """

        url = self.url + "?order_by=%s" % (order_type,)
        if dir is not None and dir in ("b", "f"):
            url += "&dir=%s" % (dir,)
        channel = self.make_request(
            "GET",
            url.encode("ascii"),
            access_token=self.admin_user_tok,
        )
        self.assertEqual(200, channel.code, msg=channel.json_body)
        self.assertEqual(channel.json_body["total"], len(expected_user_list))

        returned_order = [row["user_id"] for row in channel.json_body["users"]]
        self.assertListEqual(expected_user_list, returned_order)
        self._check_fields(channel.json_body["users"])
