"""The bundle the DEFAULT build produces, pinned where a regression goes red.

`tests/test_okf_consume.py` pinned hit@8 against the Arm B bundle alone -- the
configuration `okf build` stopped emitting on 2026-09-08. A published number
measured on a bundle nobody produces is a number that cannot regress, so the
guarantee it looks like was never held by anything.

This file pins the CURRENT default: `--outline-run 3 --table-grid --unit-fold
--drop-wrapped-outline --outline-gate --first-span-from-zero
--sheet-section-rows --keep-table-heading --close-span-gaps`, plus the reading
side's `tie_shared_rank`. Round 6 moved the first five on 2026-09-09, round 7
moved four more on 2026-09-10 and round 8 moved the last on 2026-09-11, each
after measuring hit@8 on exactly the bundle its own default produces.

The gold set is LOCAL-ONLY and stays that way: no question and no
`gold_document` is reproduced here, and a row is named by its INDEX, the way
`docs/2026-09-07-okf-konsumskill-maaling.md` already names them.

The bundle itself is a build artefact, not a fixture: it is 832 files of a
consumer's corpus and this repository is public. Absent, these tests SKIP with
the command that rebuilds it -- "not measured", never zero.
"""

from __future__ import annotations

import json
import sys
from pathlib import Path

import pytest

PROJECT_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(PROJECT_ROOT / "tools"))

import okf_consume  # noqa: E402
import okf_consume_measure  # noqa: E402

#: Built by:
#:   okf build <corpus>/K2/trinn1 \
#:       --bundle ~/corpora/okf-telling-20260829/K2-bundle-default-20260911 \
#:       --bundle-id k2-trinn1-20260903 --okf-version 0.2
#: with no arm flag at all -- the package default, which is the point.
#:
#: Rebuilt 2026-09-09 for `--contents-name` (round 9). Digest, from inside the
#: bundle:
#:   find . -type f -print0 | sort -z | xargs -0 shasum -a 256 | shasum -a 256
#:   -> 21af4a1aa98315cf514c4cbc6b4a9b77ce63960224d6d7b31b34d55cc67fb2ad
#: (The previous default, `K2-bundle-default-20260911`, was
#: 8c93e5e3222577a2b3352ca83af980e403d3a571c3a467b83c3d8170b1df2b69 at 436
#: concepts and stays on disk.)
#: Two independent builds of it differ in NOTHING (`diff -rq`), including
#: `log.md`, which carries the corpus path and never the bundle's own.
#:
#: CONCEPT IDS MOVED IN THIS REBUILD, and not only because the count did.
#: Round 9 strips pandoc's `{#sheet-N}` / `{#slide-N}` anchor where a title is
#: formed, and a concept's filename is reduced FROM its title, so TWO ids on
#: this bundle are renamed:
#:   del-ii-bilag-7-prisskjema/prissammenstilling-sheet-1 -> .../prissammenstilling
#:   del-ii-bilag-0-dokumentliste-del-ii/ark1-sheet-1     -> .../ark1
#: The first is an id `portfolio-optimiser` has cited in writing. The rename
#: was authorised by the operator on 2026-09-09 after the exposure was counted:
#: 2 of 810 concepts on the previous default and 2 of 1108 on Arm B.
DEFAULT_BUNDLE = Path.home() / "corpora" / "okf-telling-20260829" / "K2-bundle-default-20260912"
GOLD_SET = PROJECT_ROOT / ".claude/projects/2026-09-07-okf-consume-prepass/hit-at-k-questions.json"

requires_default_bundle = pytest.mark.skipif(
    not DEFAULT_BUNDLE.is_dir() or not GOLD_SET.is_file(),
    reason=(
        f"the default-configuration K2 bundle is not present at {DEFAULT_BUNDLE}. "
        "NOT MEASURED, not zero: rebuild it with `okf build <corpus>/K2/trinn1 "
        "--bundle <that path> --bundle-id k2-trinn1-20260903 --okf-version 0.2`"
    ),
)

#: Measured 2026-09-09 on the bundle above. The count moved 425 -> 436 with
#: `--sheet-section-rows --keep-table-heading`; `--first-span-from-zero` and
#: `--close-span-gaps` each moved it by NOTHING, which is the point of both --
#: they add no boundary, they only move a span's start or its end. Round 8's
#: rule closed 43 631 characters (2.51 % of the corpus) that were in no
#: segment, and the count was byte-for-byte the same 436.
#:
#: 436 -> 453 with round 9's `--contents-name`, which does add concepts: a run
#: of data rows is no longer read as a contents listing and discarded, so the
#: candidates it was taking with it survive. Corpus-wide, 429 -> 447 candidates
#: over 32 -> 33 documents with a plan, and characters in no segment stay 0.
EXPECTED_CONCEPTS = 453
EXPECTED_HITS = 6
#: Rank per question INDEX. The identity is the index; the question stays in
#: the local-only gold set.
#:
#: ROW 6 MOVED `None` -> 5 ON 2026-09-10, on these same bytes and with no
#: bundle changing: `consume.DEFAULT_SOURCE_QUOTA` became 2. It had missed on
#: every bundle and every configuration measured until then, and the test below
#: names the quota as its cause by turning it off. What the gain is NOT: hit@8
#: scores whether the gold DOCUMENT appears among the delivered excerpts, and a
#: document quota directly raises how many distinct documents a payload holds,
#: so this metric is not neutral with respect to this rule. The five rows that
#: were already rank 1 are, and they did not move.
EXPECTED_RANKS = (1, 1, 1, 1, 1, 5)


@requires_default_bundle
def test_the_default_bundle_holds_its_concept_count() -> None:
    assert len(list(okf_consume.enumerate_concepts(DEFAULT_BUNDLE))) == EXPECTED_CONCEPTS


@requires_default_bundle
def test_hit_at_eight_holds_rank_one_on_every_row_it_held() -> None:
    """The acceptance criterion round 6's default move had to clear.

    Not the hit COUNT alone: the count survived a configuration that lost a
    row from rank 1 to rank 2, which is exactly how the previous round's
    regression hid. The rank per row is the pin.

    On THIS bundle that is not a hypothetical -- see the test below, which
    reproduces the fall on these exact bytes by turning the reading-side
    default off.
    """
    questions = json.loads(GOLD_SET.read_text(encoding="utf-8"))["questions"]
    assert len(questions) == len(EXPECTED_RANKS), "the gold set changed shape"
    ranks = []
    for entry in questions:
        payload = okf_consume.build_payload(DEFAULT_BUNDLE, question=entry["question"])
        excerpts = payload["excerpts"]
        assert isinstance(excerpts, list)
        ranks.append(okf_consume_measure.hit_rank(excerpts, entry["gold_document"]))
    assert tuple(ranks) == EXPECTED_RANKS, f"hit@8 ranks moved: {ranks}"
    assert sum(rank is not None for rank in ranks) == EXPECTED_HITS


@requires_default_bundle
def test_the_bundle_declares_the_identity_the_reader_needs() -> None:
    """Whatever else moves, the bundle stays one the reading direction opens."""
    assert okf_consume.root_bundle_id_of(DEFAULT_BUNDLE) == "k2-trinn1-20260903"


@requires_default_bundle
def test_the_reading_default_is_what_holds_row_one_on_these_bytes() -> None:
    """The known-negative, on the shipped bundle rather than a fixture.

    Round 7 moved `--sheet-section-rows --keep-table-heading` into the build
    default, which splits row 1's gold document from 1 concept into 12. Round 6
    measured that exact split costing row 1 its rank, and held the two rules
    back for it. What removed the cost is `consume.DEFAULT_TIE_SHARED_RANK`,
    and this test is the proof that it is still what removes it: turn it off
    on these bytes and the fall comes back.

    Without this, `EXPECTED_RANKS` above would be a green assertion with no
    stated cause, and a later change to the fusion could take the cause away
    while the pin stayed green on some other accident.
    """
    questions = json.loads(GOLD_SET.read_text(encoding="utf-8"))["questions"]
    ranks = []
    for entry in questions:
        payload = okf_consume.build_payload(
            DEFAULT_BUNDLE, question=entry["question"], tie_shared_rank=False
        )
        excerpts = payload["excerpts"]
        assert isinstance(excerpts, list)
        ranks.append(okf_consume_measure.hit_rank(excerpts, entry["gold_document"]))
    assert ranks[0] == 2, "the known-negative stopped being negative"
    # Rows 2-5 are untouched by the tie-break. Row 6 is NOT asserted equal to
    # the pin: it is the row `DEFAULT_SOURCE_QUOTA` recovered, and the two
    # rules reach it independently, so pinning it here would assert a
    # coincidence rather than a cause.
    assert tuple(ranks[1:5]) == EXPECTED_RANKS[1:5]
    assert ranks[5] is not None


@requires_default_bundle
def test_the_stem_rule_holds_every_rank_on_the_shipped_bytes() -> None:
    """Round 10's reading-side default, pinned the way `--tie-shared-rank` is.

    The rule requires a shared prefix to be a word the bundle uses. It moves a
    payload with NO bundle changing, which is the same class of change as the
    tie-break above, so it gets the same treatment: the ranks are pinned WITH
    it, and the test below pins what it costs when it is off.

    Measured on these bytes, control run first: `under` occurs 79 times by
    equality and matches 172 concepts by prefix; `bilateral` occurs 0 times and
    matched 400 of 453 before this rule and 0 after; `standhaftig` 0 and
    219 -> 56. `undersjoisk` goes 172 -> 162 and stops there, because `under`
    IS a word here -- a genuine Norwegian morpheme rather than a residual.
    """
    questions = json.loads(GOLD_SET.read_text(encoding="utf-8"))["questions"]
    ranks = []
    for entry in questions:
        payload = okf_consume.build_payload(DEFAULT_BUNDLE, question=entry["question"])
        excerpts = payload["excerpts"]
        assert isinstance(excerpts, list)
        ranks.append(okf_consume_measure.hit_rank(excerpts, entry["gold_document"]))
    assert tuple(ranks) == EXPECTED_RANKS


@requires_default_bundle
def test_the_document_quota_is_what_reaches_row_six_on_these_bytes() -> None:
    """The known-negative for round 11's default, on the shipped bundle.

    Row 6 had missed on every bundle and every configuration measured before
    2026-09-10. `DEFAULT_SOURCE_QUOTA = 2` reaches it at rank 5, and this test
    is what keeps `EXPECTED_RANKS` from being green for an unstated reason:
    turn the quota off on these exact bytes and the miss comes back.

    The five standing rank-1 rows are asserted UNMOVED in the same run, because
    "the new rule cost nothing" is the half of the claim a hit count cannot
    see.
    """
    questions = json.loads(GOLD_SET.read_text(encoding="utf-8"))["questions"]
    ranks = []
    for entry in questions:
        payload = okf_consume.build_payload(
            DEFAULT_BUNDLE, question=entry["question"], source_quota=None
        )
        excerpts = payload["excerpts"]
        assert isinstance(excerpts, list)
        ranks.append(okf_consume_measure.hit_rank(excerpts, entry["gold_document"]))
    assert ranks[5] is None, "the known-negative stopped being negative"
    assert tuple(ranks[:5]) == EXPECTED_RANKS[:5]


@requires_default_bundle
def test_the_stem_rule_is_what_keeps_bilateral_out_of_four_hundred_concepts() -> None:
    """The known-negative for the stem rule, on the shipped bundle.

    Without it the pin above would be green with no stated cause. The number
    that names the cause is the one the rule was built for: a word occurring
    ZERO times reaching 400 of 453 concepts.

    The control is measured FIRST and in the same loop, because round 9's first
    attempt at this measurement returned 0 for the probe AND for the control --
    `enumerate_concepts` yields `str`, not `Path` -- and a zero that is really a
    broken query is indistinguishable from a zero that is a result.
    """
    root_id = okf_consume.root_bundle_id_of(DEFAULT_BUNDLE)
    concepts = [
        okf_consume.read_concept(
            DEFAULT_BUNDLE / f"{concept_id}.md",
            bundle_root=DEFAULT_BUNDLE,
            root_bundle_id=root_id,
        )
        for concept_id in okf_consume.enumerate_concepts(DEFAULT_BUNDLE)
    ]
    documents = [okf_consume.normalise(text) for text in okf_consume.searchable_text(concepts)]
    stems = frozenset(token for document in documents for token in document)

    def reach(word: str, *, stemmed: bool) -> int:
        token = okf_consume.normalise(word)[0]
        return sum(
            1
            for document in documents
            for _ in (0,)
            if any(
                okf_consume.tokens_match(token, other, stems=stems if stemmed else None)
                for other in document
            )
        )

    assert sum(1 for d in documents if okf_consume.normalise("under")[0] in d) == 79, (
        "the CONTROL first: `under` really does occur, so the query can find"
    )
    assert reach("bilateral", stemmed=False) == 400, "the defect, on these bytes"
    assert reach("bilateral", stemmed=True) == 0, "and what the rule does to it"
    assert reach("under", stemmed=True) == 172, "a real word keeps its compounds"