"""Tests for geo_service.lookup()."""

from __future__ import annotations

from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from app.services import geo_service
from app.services.geo_service import GeoInfo


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _make_session(response_json: dict[str, object], status: int = 200) -> MagicMock:
    """Build a mock aiohttp.ClientSession that returns *response_json*.

    Args:
        response_json: The dict that the mock response's ``json()`` returns.
        status: HTTP status code for the mock response.

    Returns:
        A :class:`MagicMock` that behaves like an
        ``aiohttp.ClientSession`` in an ``async with`` context.
    """
    mock_resp = AsyncMock()
    mock_resp.status = status
    mock_resp.json = AsyncMock(return_value=response_json)

    mock_ctx = AsyncMock()
    mock_ctx.__aenter__ = AsyncMock(return_value=mock_resp)
    mock_ctx.__aexit__ = AsyncMock(return_value=False)

    session = MagicMock()
    session.get = MagicMock(return_value=mock_ctx)
    return session


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------


@pytest.fixture(autouse=True)
def clear_geo_cache() -> None:  # type: ignore[misc]
    """Flush the module-level geo cache before every test."""
    geo_service.clear_cache()


# ---------------------------------------------------------------------------
# Happy path
# ---------------------------------------------------------------------------


class TestLookupSuccess:
    """geo_service.lookup() under normal conditions."""

    async def test_returns_country_code(self) -> None:
        """country_code is populated from the ``countryCode`` field."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "DE",
                "country": "Germany",
                "as": "AS3320 Deutsche Telekom AG",
                "org": "AS3320 Deutsche Telekom AG",
            }
        )
        result = await geo_service.lookup("1.2.3.4", session)  # type: ignore[arg-type]

        assert result is not None
        assert result.country_code == "DE"

    async def test_returns_country_name(self) -> None:
        """country_name is populated from the ``country`` field."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "US",
                "country": "United States",
                "as": "AS15169 Google LLC",
                "org": "Google LLC",
            }
        )
        result = await geo_service.lookup("8.8.8.8", session)  # type: ignore[arg-type]

        assert result is not None
        assert result.country_name == "United States"

    async def test_asn_extracted_without_org_suffix(self) -> None:
        """The ASN field contains only the ``AS<N>`` prefix, not the full string."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "DE",
                "country": "Germany",
                "as": "AS3320 Deutsche Telekom AG",
                "org": "Deutsche Telekom",
            }
        )
        result = await geo_service.lookup("1.2.3.4", session)  # type: ignore[arg-type]

        assert result is not None
        assert result.asn == "AS3320"

    async def test_org_populated(self) -> None:
        """org field is populated from the ``org`` key."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "US",
                "country": "United States",
                "as": "AS15169 Google LLC",
                "org": "Google LLC",
            }
        )
        result = await geo_service.lookup("8.8.8.8", session)  # type: ignore[arg-type]

        assert result is not None
        assert result.org == "Google LLC"


# ---------------------------------------------------------------------------
# Cache behaviour
# ---------------------------------------------------------------------------


class TestLookupCaching:
    """Verify that results are cached and the cache can be cleared."""

    async def test_second_call_uses_cache(self) -> None:
        """Subsequent lookups for the same IP do not make additional HTTP requests."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "DE",
                "country": "Germany",
                "as": "AS3320 Deutsche Telekom AG",
                "org": "Deutsche Telekom",
            }
        )

        await geo_service.lookup("1.2.3.4", session)  # type: ignore[arg-type]
        await geo_service.lookup("1.2.3.4", session)  # type: ignore[arg-type]

        # The session.get() should only have been called once.
        assert session.get.call_count == 1

    async def test_clear_cache_forces_refetch(self) -> None:
        """After clearing the cache a new HTTP request is made."""
        session = _make_session(
            {
                "status": "success",
                "countryCode": "DE",
                "country": "Germany",
                "as": "AS3320",
                "org": "Telekom",
            }
        )

        await geo_service.lookup("2.3.4.5", session)  # type: ignore[arg-type]
        geo_service.clear_cache()
        await geo_service.lookup("2.3.4.5", session)  # type: ignore[arg-type]

        assert session.get.call_count == 2

    async def test_negative_result_cached(self) -> None:
        """A failed lookup result (status != success) is also cached."""
        session = _make_session(
            {"status": "fail", "message": "reserved range"}
        )

        await geo_service.lookup("192.168.1.1", session)  # type: ignore[arg-type]
        await geo_service.lookup("192.168.1.1", session)  # type: ignore[arg-type]

        assert session.get.call_count == 1


# ---------------------------------------------------------------------------
# Failure modes
# ---------------------------------------------------------------------------


class TestLookupFailures:
    """geo_service.lookup() when things go wrong."""

    async def test_non_200_response_returns_none(self) -> None:
        """A 429 or 500 status returns ``None`` without caching."""
        session = _make_session({}, status=429)
        result = await geo_service.lookup("1.2.3.4", session)  # type: ignore[arg-type]
        assert result is None

    async def test_network_error_returns_none(self) -> None:
        """A network exception returns ``None``."""
        session = MagicMock()
        session.get = MagicMock(side_effect=OSError("connection refused"))

        result = await geo_service.lookup("10.0.0.1", session)  # type: ignore[arg-type]
        assert result is None

    async def test_failed_status_returns_geo_info_with_nulls(self) -> None:
        """When ip-api returns ``status=fail`` a GeoInfo with null fields is cached."""
        session = _make_session({"status": "fail", "message": "private range"})
        result = await geo_service.lookup("10.0.0.1", session)  # type: ignore[arg-type]

        assert result is not None
        assert isinstance(result, GeoInfo)
        assert result.country_code is None
        assert result.country_name is None