llm-ingestion-okf/tests/test_shell_parent.py

"""A section whose body is its heading alone points at the ancestor holding its text.

THE SHAPE, in the mechanism rather than in a corpus. A process code states its
lettered points once, on the section that owns them, and every section nested
below inherits them; the nested section itself carries a title and nothing
else. Built faithfully, it becomes a concept whose body is one heading line --
measured on one 2 761-concept standard, 710 such concepts -- and a reader
handed one has no way to reach the text it inherits: the directory tree is two
levels deep, so the parent is not in the path either.

The rule, behind `--shell-parent` and OFF by default: a plan entry whose span
holds no line but its heading gets `parent_id` naming the NEAREST preceding
entry at a smaller level whose own span holds text. An empty ancestor is passed
over, and a shell with no ancestor holding text gets no parent. Nothing is
copied: the door writes the existing `parent:` key and not one borrowed line.

It reads the PLAN -- level and order -- and never the row, so the same outline
reaches the same parents through a route that is not NISO-STS.

`sts-inherit.xml` is hand-written in an invented setting and carries no
sentence from any source.
"""

from __future__ import annotations

from pathlib import Path

from llm_ingestion_okf import cli, extract, propose

FIXTURE = Path(__file__).parent / "fixtures" / "sts-inherit.xml"

#: Every flag `okf build` turns on by default.
BUILD_DEFAULTS = dict(
    outline_run=3,
    table_grid=True,
    unit_fold=True,
    keep_table_heading=True,
    sheet_section_rows=True,
    drop_wrapped_outline=True,
    outline_gate=True,
    first_span_from_zero=True,
    close_span_gaps=True,
    contents_name=True,
)

#: shell title -> title of the nearest ancestor holding text, or None.
EXPECTED = {
    "Rekkverk": "Vedlikehold av utstyr",
    # Its parent `Rekkverk` is a shell too, so the pointer goes one further up.
    "Utskifting": "Vedlikehold av utstyr",
    "Utskifting av list": "Utskifting av enkeltdeler",
    "Utskifting av stolpe": "Utskifting av enkeltdeler",
    # A shell whose only ancestor is empty, and one with no ancestor at all.
    "Kapittel uten tekst": None,
    "Underkapittel uten tekst": None,
    # Sections holding text never get one.
    "Vedlikehold av utstyr": None,
    "Utskifting av enkeltdeler": None,
}


def _plan(source: Path, **flags: object) -> dict:  # type: ignore[type-arg]
    data = FIXTURE.read_bytes()
    text = extract.extract_text(FIXTURE.name, data)
    return propose.build_plan(
        source,
        text,
        data,
        okf_type="reference",
        proposed_at="2026-01-01T00:00:00Z",
        **BUILD_DEFAULTS,
        **flags,  # type: ignore[arg-type]
    )


def _parents(plan: dict) -> dict[str, str | None]:  # type: ignore[type-arg]
    titles = {entry["segment_id"]: entry["title"] for entry in plan["entries"]}
    return {
        entry["title"]: titles[entry["parent_id"]] if "parent_id" in entry else None
        for entry in plan["entries"]
    }


def test_a_shell_points_at_the_nearest_ancestor_holding_text() -> None:
    assert _parents(_plan(FIXTURE, shell_parent=True)) == EXPECTED


def test_nothing_moves_without_the_flag() -> None:
    plain = _plan(FIXTURE)
    assert not [entry for entry in plain["entries"] if "parent_id" in entry]
    flagged = _plan(FIXTURE, shell_parent=True)
    for entry in flagged["entries"]:
        entry.pop("parent_id", None)
    assert flagged == plain


def test_the_rule_reads_the_plan_and_not_the_row(tmp_path: Path) -> None:
    """The same outline through the bookmark arm's route: the same parents."""
    data = FIXTURE.read_bytes()
    text = extract.extract_text(FIXTURE.name, data)
    source = tmp_path / "same-outline.md"
    source.write_text(text, encoding="utf-8")
    plan = propose.build_plan(
        source,
        text,
        source.read_bytes(),
        okf_type="reference",
        proposed_at="2026-01-01T00:00:00Z",
        outline_marks=extract.xml_outline(FIXTURE.name, data),
        shell_parent=True,
        **BUILD_DEFAULTS,  # type: ignore[arg-type]
    )
    assert {entry["derived"][1] for entry in plan["entries"]} == {propose.RULE_PDF_OUTLINE}
    assert _parents(plan) == EXPECTED


def _frontmatter(bundle: Path) -> dict[str, dict[str, str]]:
    by_title: dict[str, dict[str, str]] = {}
    for path in bundle.rglob("*.md"):
        if path.name in ("index.md", "log.md"):
            continue
        head = path.read_text(encoding="utf-8").split("\n---\n", 1)[0]
        values = dict(line.split(": ", 1) for line in head.split("\n")[1:] if ": " in line)
        by_title[values["title"]] = values
    return by_title


def _build(tmp_path: Path, name: str, *extra: str) -> Path:
    inbox = tmp_path / "inbox"
    if not inbox.exists():
        inbox.mkdir()
        (inbox / FIXTURE.name).write_bytes(FIXTURE.read_bytes())
    bundle = tmp_path / name
    assert (
        cli.main(
            [
                "build",
                str(inbox),
                "--bundle",
                str(bundle),
                "--bundle-id",
                "inherit-fixture",
                "--okf-version",
                "0.2",
                *extra,
            ]
        )
        == 0
    )
    return bundle


def test_the_door_writes_parent_as_the_ancestor_s_segment_id(tmp_path: Path) -> None:
    concepts = _frontmatter(_build(tmp_path, "flagged", "--shell-parent"))
    for title, ancestor in EXPECTED.items():
        if ancestor is None:
            assert "parent" not in concepts[title]
        else:
            assert concepts[title]["parent"] == concepts[ancestor]["segment_id"]


def test_a_build_without_the_flag_is_the_build_with_the_opt_out(tmp_path: Path) -> None:
    default = _build(tmp_path, "default")
    opted_out = _build(tmp_path, "opted-out", "--no-shell-parent")
    flagged = _build(tmp_path, "flagged", "--shell-parent")
    files = sorted(p.relative_to(default) for p in default.rglob("*") if p.is_file())
    assert files == sorted(p.relative_to(opted_out) for p in opted_out.rglob("*") if p.is_file())
    for relative in files:
        assert (default / relative).read_bytes() == (opted_out / relative).read_bytes()
    # The flag adds exactly one `parent:` line to each shell with an ancestor.
    added = 0
    for relative in files:
        before = (default / relative).read_text(encoding="utf-8").split("\n")
        after = (flagged / relative).read_text(encoding="utf-8").split("\n")
        extra = [line for line in after if line not in before]
        assert all(line.startswith("parent: ") for line in extra)
        assert [line for line in after if not line.startswith("parent: ")] == before
        added += len(extra)
    assert added == sum(1 for ancestor in EXPECTED.values() if ancestor is not None)