from __future__ import annotations

from datetime import datetime, timezone
from unittest.mock import MagicMock

import pytest
from fastapi import HTTPException
from sqlalchemy import create_engine, select
from sqlalchemy.orm import Session

from app.database import Base
from app.main import _check_rate_limit
from app.models import SubmissionAttempt


def test_rate_limit_is_persistent_and_does_not_store_raw_client() -> None:
    engine = create_engine("sqlite://")
    Base.metadata.create_all(engine)
    with Session(engine) as db:
        for _ in range(5):
            mock_request = MagicMock()
            mock_request.client.host = "203.0.113.42"
            mock_request.headers.get.return_value = None
            _check_rate_limit(mock_request, db)
        with pytest.raises(HTTPException) as blocked:
            mock_request = MagicMock()
            mock_request.client.host = "203.0.113.42"
            mock_request.headers.get.return_value = None
            _check_rate_limit(mock_request, db)
        assert blocked.value.status_code == 429
        attempts = list(db.scalars(select(SubmissionAttempt)))
        assert len(attempts) == 5
        assert all(item.client_hash != "203.0.113.42" and len(item.client_hash) == 64 for item in attempts)
        assert all(item.created_at.replace(tzinfo=timezone.utc) <= datetime.now(timezone.utc) for item in attempts)


def test_rate_limit_uses_forwarded_for_header() -> None:
    engine = create_engine("sqlite://")
    Base.metadata.create_all(engine)
    with Session(engine) as db:
        mock_real = MagicMock()
        mock_real.client.host = "10.0.0.1"
        mock_real.headers.get.return_value = "198.51.100.10"
        for _ in range(5):
            _check_rate_limit(mock_real, db)
        with pytest.raises(HTTPException) as blocked:
            mock_other = MagicMock()
            mock_other.client.host = "10.0.0.2"
            mock_other.headers.get.return_value = "198.51.100.10"
            _check_rate_limit(mock_other, db)
        assert blocked.value.status_code == 429