"""A structure the publisher DECLARED takes the route declared structure takes.

MEASURED, AND THE MEASUREMENT IS THE WHOLE REASON THIS FILE EXISTS. Round 13
gave `.xml` a reader that emits **2 761 of 2 761** ATX lines for R761's titled
`<sec>` elements, with the text preserved exactly. At SHIPPED DEFAULTS the
build then delivered **23 concepts and 15 of 2 761 boundaries** -- everything
after the reader ate it. Two steps, each measured on that document and
reproduced in miniature by `sts-container.xml`:

- the **orphan check** removes a heading with nothing under its own first line.
  It took **710 of 2 761**, and 710 of 710 removed headings are followed
  immediately by another heading while **0 of 2 051** delivered ones are: they
  are container sections, not false positives. The check asks whether a GUESS
  was a heading, which is the wrong question for a section a publisher named.
- **Arm F** (`--unit-fold`, a build default) folds every level deeper than the
  shallowest repeated one into its parent. It took **2 066 more**, 2 089 -> 23,
  because a process code whose chapters are all `14.121 ...` reads as a unit
  sheet.

`find_candidates` already skips both for `outline_marks`, the PDF bookmark arm
-- which is why that arm reaches 2 762. This file pins the same route for the
one type whose reader KNOWS the structure because it wrote the heading itself,
under its OWN rule name, so an artifact still says which of the two a boundary
came from. Nothing else may move: the rule is reached only from the `.xml` row.

`sts-container.xml` is hand-written and carries no sentence from any source.
It reproduces both mechanisms at 9 declared sections: Arm B delivers 8 (the
orphan check takes the container) and the build defaults deliver 3.
"""

from __future__ import annotations

from pathlib import Path

from llm_ingestion_okf import extract, propose

FIXTURES = Path(__file__).parent / "fixtures"
STS = FIXTURES / "sts-mini.xml"
CONTAINER = FIXTURES / "sts-container.xml"
GENERIC = FIXTURES / "generic-feed.xml"

#: Every flag `okf build` turns on by default, so a test that says "at shipped
#: defaults" is measuring the defaults and not a subset of them.
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,
)


def test_the_reader_reports_the_line_every_declared_section_landed_on() -> None:
    """No bridge, and that is the difference from the PDF arm.

    The PDF arm has to map (page, `/XYZ` top) onto a line index and was wrong
    on 1 840 of 2 762 under the naive rule. Here the reader WROTE the line, so
    the index is the one it appended at -- asserted against the text itself
    rather than against a count, because a mark naming the right title at the
    wrong offset passes any count.
    """
    text = extract.extract_text(CONTAINER.name, CONTAINER.read_bytes())
    marks = extract.xml_outline(CONTAINER.name, CONTAINER.read_bytes())
    lines = text.split("\n")

    assert [(m.level, m.title) for m in marks] == [
        (1, "1 Kapittel uten egen brodtekst"),
        (2, "1.1 Foerste underseksjon"),
        (2, "1.2 Andre underseksjon"),
        (1, "2 Kapittel med brodtekst"),
        (2, "2.1 Enhet oppgjort etter lengde"),
        (2, "2.2 Enhet oppgjort etter areal"),
        (2, "2.3 Enhet oppgjort etter volum"),
        (1, "3 Tredje kapittel"),
        (2, "3.1 Enhet oppgjort etter stykk"),
    ]
    for mark in marks:
        assert lines[mark.line] == "#" * mark.level + " " + mark.title


def test_a_declared_section_is_a_rule_of_its_own_and_not_the_bookmark_arms() -> None:
    """A reader who cannot tell them apart in the artifact cannot tell them apart."""
    assert propose.RULE_XML_SECTION == "rule:xml-section"
    assert propose.RULE_XML_SECTION in propose.RULE_NAMES
    assert propose.RULE_XML_SECTION != propose.RULE_PDF_OUTLINE
    assert propose.RULE_XML_SECTION != propose.RULE_HEADING


def test_a_container_section_survives_where_the_orphan_check_deletes_it() -> None:
    """710 of 2 761 on R761; 1 of 9 here, and it is the chapter above the rest."""
    text = extract.extract_text(CONTAINER.name, CONTAINER.read_bytes())
    marks = extract.xml_outline(CONTAINER.name, CONTAINER.read_bytes())

    without = [c.title for c in propose.find_candidates(text)]
    assert "1 Kapittel uten egen brodtekst" not in without

    declared = propose.find_candidates(
        text, outline_marks=marks, outline_rule=propose.RULE_XML_SECTION
    )
    assert [c.title for c in declared] == [
        "Kapittel uten egen brodtekst",
        "Foerste underseksjon",
        "Andre underseksjon",
        "Kapittel med brodtekst",
        "Enhet oppgjort etter lengde",
        "Enhet oppgjort etter areal",
        "Enhet oppgjort etter volum",
        "Tredje kapittel",
        "Enhet oppgjort etter stykk",
    ]
    assert {c.rule for c in declared} == {propose.RULE_XML_SECTION}


def test_the_unit_fold_does_not_eat_a_section_the_publisher_declared() -> None:
    """2 089 -> 23 on R761; 8 -> 3 here. At the SHIPPED defaults, not behind a flag."""
    text = extract.extract_text(CONTAINER.name, CONTAINER.read_bytes())
    marks = extract.xml_outline(CONTAINER.name, CONTAINER.read_bytes())

    assert len(propose.find_candidates(text, **BUILD_DEFAULTS)) == 3
    assert (
        len(
            propose.find_candidates(
                text,
                outline_marks=marks,
                outline_rule=propose.RULE_XML_SECTION,
                **BUILD_DEFAULTS,
            )
        )
        == 9
    )


def test_only_the_xml_row_takes_the_declared_route(tmp_path: Path) -> None:
    """The same markdown from a `.md` file is a GUESS and keeps `rule:heading`.

    The route is chosen by the row, not by the text, which is what keeps every
    other file type byte-identical: a document whose reader did not write the
    heading has declared nothing.
    """
    text = extract.extract_text(CONTAINER.name, CONTAINER.read_bytes())
    source = tmp_path / "same-markdown.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",
        **BUILD_DEFAULTS,
    )
    assert [entry["derived"][1] for entry in plan["entries"]] == [propose.RULE_HEADING] * 3

    xml_source = tmp_path / "sts-container.xml"
    xml_source.write_bytes(CONTAINER.read_bytes())
    xml_plan = propose.build_plan(
        xml_source,
        text,
        xml_source.read_bytes(),
        okf_type="reference",
        proposed_at="2026-01-01T00:00:00Z",
        **BUILD_DEFAULTS,
    )
    assert [entry["derived"][1] for entry in xml_plan["entries"]] == [propose.RULE_XML_SECTION] * 9


def test_the_number_becomes_the_directory_the_way_the_bookmark_arm_does_it() -> None:
    """`<label>` is the number and `<title>` is the text, split by ONE function.

    The same `_split_outline_title` the PDF arm uses, so the two arms name one
    section the same way and can be compared concept for concept.
    """
    text = extract.extract_text(STS.name, STS.read_bytes())
    marks = extract.xml_outline(STS.name, STS.read_bytes())
    declared = propose.find_candidates(
        text, outline_marks=marks, outline_rule=propose.RULE_XML_SECTION
    )

    assert [(c.number, c.title) for c in declared] == [
        (None, "Forord"),
        ("1", "Bruksomraade"),
        ("1.1", "Omfang"),
        ("1.1.1", "Materialer"),
        ("2", "Tabeller"),
    ]


def test_generic_xml_declares_nothing_and_the_route_stays_empty() -> None:
    """An EMPTY mark list is "this document declares no section", not a route.

    The two must not collapse: a schema that is not STS gets no invented
    structure, so the text rules keep the document exactly as they had it.
    """
    assert extract.xml_outline(GENERIC.name, GENERIC.read_bytes()) == ()

    text = extract.extract_text(GENERIC.name, GENERIC.read_bytes())
    assert propose.find_candidates(text) == []


def test_the_bookmark_arm_keeps_its_own_rule() -> None:
    """`outline_rule` defaults to the bookmark arm's name, so the PDF path is
    reached by exactly the call it was reached by before."""
    text = "# One\nbody\n# Two\nbody\n"
    marks = (extract.OutlineMark(line=0, level=1, title="One"),)
    declared = propose.find_candidates(text, outline_marks=marks)

    assert [c.rule for c in declared] == [propose.RULE_PDF_OUTLINE]