import cProfile
import logging
import tempfile
from typing import Any

from django.contrib.sessions.backends.base import SessionBase
from django.core.management.base import CommandParser
from django.http import HttpRequest, HttpResponseBase

from zerver.lib.management import ZulipBaseCommand
from zerver.lib.request import RequestNotes
from zerver.lib.test_helpers import HostRequestMock
from zerver.middleware import LogRequests
from zerver.models import UserMessage
from zerver.views.message_fetch import get_messages_backend


class MockSession(SessionBase):
    def __init__(self) -> None:
        self.modified = False


def profile_request(request: HttpRequest) -> HttpResponseBase:
    def get_response(request: HttpRequest) -> HttpResponseBase:
        return prof.runcall(get_messages_backend, request, request.user, apply_markdown=True)

    prof = cProfile.Profile()
    with tempfile.NamedTemporaryFile(prefix="profile.data.", delete=False) as stats_file:
        response = LogRequests(get_response)(request)
        assert isinstance(response, HttpResponseBase)  # async responses not supported here for now
        prof.dump_stats(stats_file.name)
        logging.info("Profiling data written to %s", stats_file.name)
    return response


class Command(ZulipBaseCommand):
    def add_arguments(self, parser: CommandParser) -> None:
        parser.add_argument("email", metavar="<email>", help="Email address of the user")
        self.add_realm_args(parser)

    def handle(self, *args: Any, **options: Any) -> None:
        realm = self.get_realm(options)
        user = self.get_user(options["email"], realm)
        anchor = UserMessage.objects.filter(user_profile=user).order_by("-message")[200].message_id
        mock_request = HostRequestMock(
            post_data={
                "anchor": anchor,
                "num_before": 1200,
                "num_after": 200,
            },
            user_profile=user,
            meta_data={"REMOTE_ADDR": "127.0.0.1"},
            path="/",
        )
        mock_request.session = MockSession()
        RequestNotes.get_notes(mock_request).log_data = None

        profile_request(mock_request)