import unittest

from utils import format_coord, parse_coord


class TestCoordinateFormatting(unittest.TestCase):

    def test_round_trip(self):
        cases = [
            (52.25, 4.0, "N5225E0400"),
            (-13.5, -122.0, "S1350W12200"),
            (0.0, 0.0, "N0000E0000"),
            (51.75, 6.5, "N5175E0650"),
            (-0.25, 0.25, "S0025E0025"),
        ]
        for lat, lon, expected in cases:
            with self.subTest(lat=lat, lon=lon):
                self.assertEqual(format_coord(lat, lon), expected)
                parsed_lat, parsed_lon = parse_coord(expected)
                print(f"Parsed: {parsed_lat}, {parsed_lon} from {expected}")
                self.assertAlmostEqual(parsed_lat, lat, places=6)
                self.assertAlmostEqual(parsed_lon, lon, places=6)

    def test_invalid_length(self):
        with self.assertRaises(ValueError):
            parse_coord("N52E4")  # too short, malformed

    def test_negative_coordinates(self):
        coord = format_coord(-52.25, -4.0)
        self.assertEqual(coord, "S5225W0400")
        lat, lon = parse_coord(coord)
        self.assertAlmostEqual(lat, -52.25, places=6)
        self.assertAlmostEqual(lon, -4.0, places=6)


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