from datetime import timedelta
from typing import Any, Callable
from unittest import mock

from django.utils.timezone import now as timezone_now

from zerver.lib.actions import change_user_is_active
from zerver.lib.sessions import (
    delete_all_deactivated_user_sessions,
    delete_all_user_sessions,
    delete_realm_user_sessions,
    delete_session,
    delete_user_sessions,
    get_expirable_session_var,
    set_expirable_session_var,
    user_sessions,
)
from zerver.lib.test_classes import ZulipTestCase
from zerver.models import Realm, UserProfile, get_realm


class TestSessions(ZulipTestCase):
    def do_test_session(
        self, user: UserProfile, action: Callable[[], Any], realm: Realm, expected_result: bool
    ) -> None:
        self.login_user(user)
        self.assertIn("_auth_user_id", self.client.session)
        action()
        if expected_result:
            result = self.client_get("/", subdomain=realm.subdomain)
            self.assertEqual(302, result.status_code)
            self.assertEqual("/login/", result.url)
        else:
            self.assertIn("_auth_user_id", self.client.session)

    def test_delete_session(self) -> None:
        user_profile = self.example_user("hamlet")
        self.login_user(user_profile)
        self.assertIn("_auth_user_id", self.client.session)
        for session in user_sessions(user_profile):
            delete_session(session)
        result = self.client_get("/")
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/login/")

    def test_delete_user_sessions(self) -> None:
        user_profile = self.example_user("hamlet")
        self.do_test_session(
            user_profile, lambda: delete_user_sessions(user_profile), get_realm("zulip"), True
        )
        self.do_test_session(
            self.example_user("othello"),
            lambda: delete_user_sessions(user_profile),
            get_realm("zulip"),
            False,
        )

    def test_delete_realm_user_sessions(self) -> None:
        realm = get_realm("zulip")
        self.do_test_session(
            self.example_user("hamlet"),
            lambda: delete_realm_user_sessions(realm),
            get_realm("zulip"),
            True,
        )
        self.do_test_session(
            self.mit_user("sipbtest"),
            lambda: delete_realm_user_sessions(realm),
            get_realm("zephyr"),
            False,
        )

    def test_delete_all_user_sessions(self) -> None:
        self.do_test_session(
            self.example_user("hamlet"),
            lambda: delete_all_user_sessions(),
            get_realm("zulip"),
            True,
        )
        self.do_test_session(
            self.mit_user("sipbtest"), lambda: delete_all_user_sessions(), get_realm("zephyr"), True
        )

    def test_delete_all_deactivated_user_sessions(self) -> None:

        # Test that no exception is thrown with a logged-out session
        self.login("othello")
        self.assertIn("_auth_user_id", self.client.session)
        self.client_post("/accounts/logout/")
        delete_all_deactivated_user_sessions()
        result = self.client_get("/")
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/login/")

        # Test nothing happens to an active user's session
        self.login("othello")
        self.assertIn("_auth_user_id", self.client.session)
        delete_all_deactivated_user_sessions()
        self.assertIn("_auth_user_id", self.client.session)

        # Test that a deactivated session gets logged out
        user_profile_3 = self.example_user("cordelia")
        self.login_user(user_profile_3)
        self.assertIn("_auth_user_id", self.client.session)
        change_user_is_active(user_profile_3, False)
        with self.assertLogs(level="INFO") as info_logs:
            delete_all_deactivated_user_sessions()
        self.assertEqual(
            info_logs.output,
            [f"INFO:root:Deactivating session for deactivated user {user_profile_3.id}"],
        )
        result = self.client_get("/")
        self.assertEqual(result.status_code, 302)
        self.assertEqual(result.url, "/login/")


class TestExpirableSessionVars(ZulipTestCase):
    def setUp(self) -> None:
        self.session = self.client.session
        super().setUp()

    def test_set_and_get_basic(self) -> None:
        start_time = timezone_now()
        with mock.patch("zerver.lib.sessions.timezone_now", return_value=start_time):
            set_expirable_session_var(
                self.session, "test_set_and_get_basic", "some_value", expiry_seconds=10
            )
            value = get_expirable_session_var(self.session, "test_set_and_get_basic")
            self.assertEqual(value, "some_value")
        with mock.patch(
            "zerver.lib.sessions.timezone_now", return_value=start_time + timedelta(seconds=11)
        ):
            value = get_expirable_session_var(self.session, "test_set_and_get_basic")
            self.assertEqual(value, None)

    def test_set_and_get_with_delete(self) -> None:
        set_expirable_session_var(
            self.session, "test_set_and_get_with_delete", "some_value", expiry_seconds=10
        )
        value = get_expirable_session_var(self.session, "test_set_and_get_with_delete", delete=True)
        self.assertEqual(value, "some_value")
        self.assertEqual(
            get_expirable_session_var(self.session, "test_set_and_get_with_delete"), None
        )

    def test_get_var_not_set(self) -> None:
        value = get_expirable_session_var(
            self.session, "test_get_var_not_set", default_value="default"
        )
        self.assertEqual(value, "default")

    def test_get_var_is_not_expirable(self) -> None:
        self.session["test_get_var_is_not_expirable"] = 0
        with self.assertLogs(level="WARNING") as m:
            value = get_expirable_session_var(
                self.session, "test_get_var_is_not_expirable", default_value="default"
            )
            self.assertEqual(value, "default")
            self.assertIn(
                "WARNING:root:get_expirable_session_var: error getting test_get_var_is_not_expirable",
                m.output[0],
            )