import unittest
from unittest.mock import patch

from src.geometry import selection_from_lat_lon
from src.topography import fetch_topography


class TopographyTests(unittest.TestCase):
    def test_fetch_topography_summarizes_elevation_samples(self):
        selection = selection_from_lat_lon(21.002, 70.245, radius_m=250)
        fake_response = {
            "results": [
                {"elevation": 12.0},
                {"elevation": 14.5},
                {"elevation": 13.0},
                {"elevation": 16.0},
            ]
        }
        with patch("src.topography.get_json", return_value=fake_response):
            topo, evidence = fetch_topography(selection)

        self.assertEqual(topo["sample_count"], 4)
        self.assertEqual(topo["min_elevation_m"], 12.0)
        self.assertEqual(topo["max_elevation_m"], 16.0)
        self.assertGreaterEqual(topo["relief_m"], 4.0)
        self.assertEqual(evidence[0].category, "Topography")
        self.assertIn("not a site survey", evidence[0].limitation)

    def test_fetch_topography_failure_returns_safe_evidence(self):
        selection = selection_from_lat_lon(21.002, 70.245, radius_m=250)
        with patch("src.topography.get_json", side_effect=TimeoutError("slow")):
            topo, evidence = fetch_topography(selection)

        self.assertEqual(topo, {})
        self.assertEqual(evidence[0].confidence, "low")
        self.assertIn("Do not infer slope", evidence[0].design_implication)


if __name__ == "__main__":
    unittest.main()