"""Tests for slug generation."""

from researchlink.services.slugify import make_paper_slug


def test_basic_slug():
    assert make_paper_slug("Attention Is All You Need", 2017) == "2017-attention-is-all-you-need"


def test_slug_strips_subtitle():
    result = make_paper_slug("MARL-IoTP: Heterogeneous Multi-Agent Learning for Perception-Aware Edge Orchestration", 2026)
    assert result.startswith("2026-marl-iotp")


def test_slug_no_year():
    result = make_paper_slug("Deep Reinforcement Learning")
    assert result == "deep-reinforcement-learning"
    assert not result.startswith("-")


def test_slug_max_length():
    long_title = "A " * 40 + "Paper"
    result = make_paper_slug(long_title, 2024)
    assert len(result) <= 60  # year prefix (5) + 50 slug + buffer


def test_slug_special_chars():
    result = make_paper_slug("BERT: Pre-training of Deep Bidirectional Transformers", 2019)
    assert "bert" in result
    assert ":" not in result


def test_slug_lowercase():
    result = make_paper_slug("Upper Case Title", 2023)
    assert result == result.lower()


def test_slug_no_double_hyphens():
    result = make_paper_slug("Multi--Agent   Systems", 2022)
    assert "--" not in result