from __future__ import annotations

from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]


def test_root_readme_documents_canonical_numbering() -> None:
    readme = (PROJECT_ROOT / "README.md").read_text(encoding="utf-8")

    assert "1 = 内酯羰基碳" in readme
    assert "2 = 相邻酯氧" in readme
    assert "3..N = 从 2 位出发沿环唯一图遍历顺序继续编号" in readme
    assert "6 → 13" in readme
    assert "7 → 12" in readme


def test_root_agents_exists_and_documents_numbering_invariants() -> None:
    agents_path = PROJECT_ROOT / "AGENTS.md"

    assert agents_path.exists()
    agents = agents_path.read_text(encoding="utf-8")
    assert "canonical numbering" in agents
    assert "不是视觉顺时针" in agents
    assert "bridge / fused multi-anchor" in agents


def test_mkdocs_ring_numbering_page_documents_mirror_mapping() -> None:
    ring_doc = (PROJECT_ROOT / "docs" / "user-guide" / "ring-numbering.md").read_text(encoding="utf-8")

    assert "p_mirror = ring_size - p + 3" in ring_doc
    assert "6 → 13" in ring_doc
    assert "15 → 4" in ring_doc