"""Tests for the pool naming convention helpers (src.core.naming)."""
import pytest

from src.core.naming import (
    canonical_pool_stem,
    is_canonical_pool_stem,
    is_valid_year,
    parse_pool_stem,
    year_from_filename,
)


@pytest.mark.parametrize("year,ok", [
    ("1968", True), (1968, True), ("968", False), ("19688", False),
    ("abcd", False), ("", False), ("  1999 ", True),
])
def test_is_valid_year(year, ok):
    assert is_valid_year(year) is ok


def test_canonical_pool_stem_builds_title_year():
    assert canonical_pool_stem("Matrix", 1999) == "Matrix (1999)"
    assert canonical_pool_stem("  Matrix  ", "1999") == "Matrix (1999)"


def test_canonical_pool_stem_rejects_bad_year():
    with pytest.raises(ValueError):
        canonical_pool_stem("Matrix", "99")


def test_canonical_pool_stem_rejects_empty_title():
    with pytest.raises(ValueError):
        canonical_pool_stem("   ", "1999")


def test_parse_pool_stem_roundtrip():
    assert parse_pool_stem("Matrix (1999)") == ("Matrix", 1999)
    # title keeps its own parentheses; only the trailing year is peeled off
    assert parse_pool_stem("Já, robot (2004)") == ("Já, robot", 2004)
    assert parse_pool_stem("Kurz (special) (2019)") == ("Kurz (special)", 2019)


def test_parse_pool_stem_non_canonical():
    assert parse_pool_stem("Matrix") is None
    assert parse_pool_stem("Matrix (99)") is None
    assert parse_pool_stem("Matrix 1999") is None


def test_is_canonical_pool_stem():
    assert is_canonical_pool_stem("Matrix (1999)")
    assert not is_canonical_pool_stem("Matrix")


@pytest.mark.parametrize("name,year", [
    ("Matrix.1999.1080p.BluRay.mkv", "1999"),
    ("Šíleně smutná princezna (1968).mkv", "1968"),
    ("Movie 2001 2010 remux.mkv", "2010"),  # last standalone year wins
    ("No Year Here.mkv", None),
    ("Film 12345.mkv", None),  # not a bare 4-digit year
])
def test_year_from_filename(name, year):
    assert year_from_filename(name) == year