from uk_plate_reader import read_licence_plate
import pytest # type: ignore

def test_old_plate_returns_correct_area():
    assert read_licence_plate("N12 ANA")[0] == "Manchester"
    assert read_licence_plate("L12 AOE")[0] == "Birmingham"
    assert read_licence_plate("L12 AP")[0] == "Surrey"

def test_new_plate_returns_correct_area():
    assert read_licence_plate("LL07 XYZ")[0] == "London"
    assert read_licence_plate("OJ57 XYZ")[0] == "Oxford"
    assert read_licence_plate("BB62 XYZ")[0] == "Birmingham"

def test_old_plate_returns_correct_year():
    assert read_licence_plate("N12 AOE")[1] in [1995, 1996]
    assert read_licence_plate("L12 AOE")[1] in [1993, 1994]

def test_new_plate_returns_correct_year():
    assert read_licence_plate("AB07 XYZ")[1] == 2007
    assert read_licence_plate("AB57 XYZ")[1] in [2007, 2008]
    assert read_licence_plate("AB62 XYZ")[1] in [2012, 2013]

def test_invalid_plate_returns_error():
    for plate in ["A", "ZZ07 LMA", "Z12 ANA", "Y12 ZZZ"]:
        with pytest.raises(Exception):
            read_licence_plate(plate)

def test_empty_input_returns_error():
    with pytest.raises(IndexError):
        read_licence_plate("")

def test_legacy_single_char_area():
    assert read_licence_plate("N12 AM")[0] == "Cheshire"