"""Unit tests for cadastral reverse geocode and modified reverse_geocode."""
from __future__ import annotations

import os
import sys
from unittest.mock import AsyncMock, MagicMock, patch

# DATABASE_URL required by config before any app import.
os.environ.setdefault("DATABASE_URL", "postgresql+psycopg://test:test@localhost:5432/test")
os.environ.setdefault("MAIN_BACKEND_URL", "http://gendesign-backend:8000")

# WeasyPrint stub — not installed in CI without GTK.
_wp_mock = MagicMock()
sys.modules.setdefault("weasyprint", _wp_mock)

import pytest

from app.services.geocoder import _cadastral_reverse, reverse_geocode


# ── _cadastral_reverse ────────────────────────────────────────────────────────


async def test_cadastral_reverse_returns_address_on_200() -> None:
    """Main backend returns 200 → address string returned."""
    mock_response = MagicMock()
    mock_response.status_code = 200
    mock_response.raise_for_status = MagicMock()
    mock_response.json.return_value = {
        "address": "ул. Малышева, 30, Екатеринбург",
        "lat": 56.838,
        "lon": 60.605,
        "distance_m": 12.5,
    }

    mock_client = AsyncMock()
    mock_client.get = AsyncMock(return_value=mock_response)
    mock_client.__aenter__ = AsyncMock(return_value=mock_client)
    mock_client.__aexit__ = AsyncMock(return_value=False)

    with patch("app.services.geocoder.httpx.AsyncClient", return_value=mock_client):
        result = await _cadastral_reverse(56.838, 60.605)

    assert result == "ул. Малышева, 30, Екатеринбург"


async def test_cadastral_reverse_returns_none_on_404() -> None:
    """Main backend returns 404 (no building in radius) → None, no exception."""
    mock_response = MagicMock()
    mock_response.status_code = 404

    mock_client = AsyncMock()
    mock_client.get = AsyncMock(return_value=mock_response)
    mock_client.__aenter__ = AsyncMock(return_value=mock_client)
    mock_client.__aexit__ = AsyncMock(return_value=False)

    with patch("app.services.geocoder.httpx.AsyncClient", return_value=mock_client):
        result = await _cadastral_reverse(56.838, 60.605)

    assert result is None


async def test_cadastral_reverse_returns_none_on_timeout() -> None:
    """Network timeout → None returned, no exception bubbles out."""
    import httpx

    mock_client = AsyncMock()
    mock_client.get = AsyncMock(side_effect=httpx.TimeoutException("timeout"))
    mock_client.__aenter__ = AsyncMock(return_value=mock_client)
    mock_client.__aexit__ = AsyncMock(return_value=False)

    with patch("app.services.geocoder.httpx.AsyncClient", return_value=mock_client):
        result = await _cadastral_reverse(56.838, 60.605)

    assert result is None


async def test_cadastral_reverse_returns_none_when_not_configured() -> None:
    """main_backend_url is None → immediately returns None without HTTP call."""
    with patch("app.services.geocoder.settings") as mock_settings:
        mock_settings.main_backend_url = None

        with patch("app.services.geocoder.httpx.AsyncClient") as mock_client_cls:
            result = await _cadastral_reverse(56.838, 60.605)
            mock_client_cls.assert_not_called()

    assert result is None


# ── reverse_geocode ───────────────────────────────────────────────────────────


async def test_reverse_geocode_returns_cadastral_when_available() -> None:
    """Cadastral returns address → Nominatim is never called."""
    with (
        patch(
            "app.services.geocoder._cadastral_reverse",
            new_callable=AsyncMock,
            return_value="ул. Малышева, 30, Екатеринбург",
        ) as mock_cadastral,
        patch(
            "app.services.geocoder._nominatim_reverse",
            new_callable=AsyncMock,
        ) as mock_nominatim,
    ):
        result = await reverse_geocode(56.838, 60.605)

    assert result == "ул. Малышева, 30, Екатеринбург"
    mock_cadastral.assert_called_once_with(56.838, 60.605)
    mock_nominatim.assert_not_called()


async def test_reverse_geocode_falls_back_to_nominatim_when_cadastral_none() -> None:
    """Cadastral returns None → Nominatim is called and its result returned."""
    with (
        patch(
            "app.services.geocoder._cadastral_reverse",
            new_callable=AsyncMock,
            return_value=None,
        ),
        patch(
            "app.services.geocoder._nominatim_reverse",
            new_callable=AsyncMock,
            return_value="Трамвайный переулок, 2, Екатеринбург",
        ) as mock_nominatim,
    ):
        result = await reverse_geocode(56.838, 60.605)

    assert result == "Трамвайный переулок, 2, Екатеринбург"
    mock_nominatim.assert_called_once_with(56.838, 60.605)


async def test_reverse_geocode_returns_none_when_both_fail() -> None:
    """Both cadastral and Nominatim fail → returns None, no exception raised."""
    with (
        patch(
            "app.services.geocoder._cadastral_reverse",
            new_callable=AsyncMock,
            return_value=None,
        ),
        patch(
            "app.services.geocoder._nominatim_reverse",
            new_callable=AsyncMock,
            side_effect=RuntimeError("Nominatim 403 Forbidden — IP banned"),
        ),
    ):
        result = await reverse_geocode(56.838, 60.605)

    # Must return None, not raise
    assert result is None