"""``read_file`` / ``read_dir`` / ``read_bundle`` RETURN their refusal; they no longer raise.

**F99-D3.** Finding 99 closed exactly one half of this and said so
(``docs/2026-09-08-funn-99-chatclient-refusal.md`` lines 132-135): ``quick_validate`` was made to
return ``{"decision": "refused", ...}``, while "``read_file`` / ``read_dir`` / ``read_bundle``
raiser fortsatt, og deres raises telles på nøyaktig samme måte ... **MÅLT, RAPPORTERT, IKKE
FIKSET.**" The trio measured immediately before the live 400 was three ``read_file`` refusals on
``del-ii-bilag-7-prisskjema*`` -- the same document findings 4 and 5 of this order are about.

**Why a raise is worse than useless here, MEASURED in the framework's own source.** MAF turns a
tool's exception into the opaque string ``"Error: Function failed."``
(``agent_framework/_tools.py:1410-1432``), suppressing the detail unless ``include_detailed_errors``
is set (``:1427``), and counts it against ``DEFAULT_MAX_CONSECUTIVE_ERRORS_PER_REQUEST = 3``
(``:96``, ``:2718-2731``). So everything the refusing arm KNOWS -- which base ids exist, which
document the path really names, which rung reads it -- is destroyed on the way out, and three of
them end the request. The model is left guessing, which is what finding 99 recorded it doing in its
own words.

**The gates themselves are UNCHANGED.** This is the shape of the answer, never its content: the
verdict layer and the §4.1a dimension scope refuse exactly what they refused before, and the
property they exist for -- **the bytes never reach the model** -- is asserted explicitly on the
returned value, not assumed from the fact that an exception used to be raised.

**Form per tool, and the difference is forced by the return type.** ``read_bundle`` and ``read_dir``
return ``dict``, so the refusal is a mapping with no key a successful listing has. ``read_file``
returns ``str``: making it a mapping would change the shape of every SUCCESSFUL read and therefore
every prompt byte S2c measured, so the refusal is a string with a fixed leading sentinel. A
``str`` refusal a caller cannot tell from a document would be worthless, and the honesty limit --
a document whose first characters happen to be that sentinel -- is stated in the docstring rather
than pretended away.

**Keyed on the class, never on bare ``Exception``.** The known-negative below raises a plain
``RuntimeError`` from inside a tool body and requires it to propagate: we are not in the business of
hiding failures we did not name, and ``ExplorationError`` being itself a ``RuntimeError`` subclass
is exactly why the arm has to be a list of names rather than a base class.
"""

from __future__ import annotations

import shutil
from pathlib import Path
from typing import Any

import pytest

from portfolio_optimiser import okf
from portfolio_optimiser.explore import navigator_tools

BUNDLE_DIR = Path(__file__).resolve().parents[1] / "shared" / "examples" / "bygg-energi-mikro"
_VERDICT_FILE = "verdict-led-fro.md"
_CONCEPT_FILE = "metode-ipmvp-a.md"
_SENTINEL = "READ-TOOL-LEAK-SENTINEL-z9y8x7"


def _tools(bundle_dir: str | Path, dimension: str | None = None) -> dict[str, Any]:
    return {t.name: t for t in navigator_tools([str(bundle_dir)], dimension=dimension)}


def _marked_copy(tmp_path: Path, target: str) -> Path:
    """A copy of the fixture base with ``_SENTINEL`` appended to one document's body, so a leak of
    that document's CONTENT into a refusal is detectable by a string that exists nowhere else."""
    copy = tmp_path / "bundle"
    shutil.copytree(BUNDLE_DIR, copy)
    doc = copy / target
    doc.write_text(doc.read_text(encoding="utf-8") + f"\n{_SENTINEL}\n", encoding="utf-8")
    return copy


# --- (1) the unknown base id: the trio measured in front of the live 400 ------------------------


def test_an_unknown_base_is_returned_as_a_refusal_by_all_three_tools() -> None:
    """(1) The measured case. All three name the configured ids, so the model can correct itself
    instead of receiving ``"Error: Function failed."`` three times and ending the request."""
    tools = _tools(BUNDLE_DIR)
    guessed = "renholdstekniske_funksjonskrav"

    listing = tools["read_bundle"].func(bundle_id=guessed)
    assert isinstance(listing, dict) and "refused" in listing
    assert BUNDLE_DIR.name in listing["refused"]

    directory = tools["read_dir"].func(bundle_id=guessed, path="x")
    assert isinstance(directory, dict) and "refused" in directory
    assert BUNDLE_DIR.name in directory["refused"]

    document = tools["read_file"].func(bundle_id=guessed, path="index.md")
    assert isinstance(document, str) and document.startswith("REFUSED")
    assert BUNDLE_DIR.name in document


# --- (2) the verdict layer: the reason travels, the bytes never do ------------------------------


def test_the_verdict_layer_refusal_carries_the_reason_and_never_the_content(
    tmp_path: Path,
) -> None:
    """(2) The gate is unchanged; only the shape of the answer is. The assertion the order requires
    is the second one: a returned refusal must not become a channel for the bytes the gate exists
    to withhold."""
    base = _marked_copy(tmp_path, _VERDICT_FILE)
    answer = _tools(base)["read_file"].func(bundle_id=base.name, path=_VERDICT_FILE)
    assert isinstance(answer, str) and answer.startswith("REFUSED")
    assert "verdict" in answer.lower()
    assert _SENTINEL not in answer, "the refusal leaked the document it refused"


def test_an_ordinary_document_in_the_same_base_still_reads_whole(tmp_path: Path) -> None:
    """(2) CONTROL. Without this, arm (2) is satisfied by a tool that refuses everything."""
    base = _marked_copy(tmp_path, _CONCEPT_FILE)
    body = _tools(base)["read_file"].func(bundle_id=base.name, path=_CONCEPT_FILE)
    assert _SENTINEL in body
    assert not body.startswith("REFUSED")


# --- (3) the §4.1a dimension scope --------------------------------------------------------------


def test_the_dimension_refusal_carries_the_reason_and_never_the_content(tmp_path: Path) -> None:
    """(3) The other gate this change touches. Same two halves: the reason travels, the body does
    not."""
    base = _marked_copy(tmp_path, _CONCEPT_FILE)
    foreign = base / "fremmed-dimensjon.md"
    foreign.write_text(
        f"---\ntype: methodology\ntitle: Asfalt\ndimension: asfalt\n---\n\n{_SENTINEL}\n",
        encoding="utf-8",
    )
    index = base / "index.md"
    index.write_text(
        index.read_text(encoding="utf-8") + "\n- [Asfalt](fremmed-dimensjon.md)\n", encoding="utf-8"
    )
    answer = _tools(base, dimension="tunnel")["read_file"].func(
        bundle_id=base.name, path="fremmed-dimensjon.md"
    )
    assert isinstance(answer, str) and answer.startswith("REFUSED")
    assert "tunnel" in answer
    assert _SENTINEL not in answer, "the refusal leaked the out-of-scope document"


# --- (4) the wrong rung, both directions --------------------------------------------------------


def test_the_wrong_rung_is_returned_by_both_tools() -> None:
    """(4) F3's asymmetry, preserved through the change: each refusal still names the rung that
    WOULD read the thing, and the two branches still share no wording."""
    tools = _tools(BUNDLE_DIR)
    as_document = tools["read_dir"].func(bundle_id=BUNDLE_DIR.name, path=_CONCEPT_FILE)
    assert "refused" in as_document and "read_file" in as_document["refused"]

    unknown = tools["read_dir"].func(bundle_id=BUNDLE_DIR.name, path="kategori-99")
    assert "refused" in unknown and "read_file" not in unknown["refused"]
    assert unknown["refusal"] != as_document["refusal"], (
        "a wrong rung and a path that does not exist are different facts; collapsing them into one "
        "kind leaves a caller unable to tell 'use the other tool' from 'this does not exist'"
    )


# --- (5) KNOWN-NEGATIVE: an unnamed failure still propagates ------------------------------------


def test_a_plain_runtime_error_still_propagates(monkeypatch: pytest.MonkeyPatch) -> None:
    """(5) KNOWN-NEGATIVE, and the reason the arm is a list of NAMES. ``ExplorationError`` is itself
    a ``RuntimeError`` subclass, so an arm written as ``except RuntimeError`` would swallow this
    one too -- turning an unknown failure into a confident-looking answer, which is worse than the
    opaque string this change removes."""
    tools = _tools(BUNDLE_DIR)

    def boom(*args: Any, **kwargs: Any) -> Any:
        raise RuntimeError("something we never named")

    monkeypatch.setattr(okf, "navigate_bundle", boom)
    with pytest.raises(RuntimeError, match="something we never named"):
        tools["read_bundle"].func(bundle_id=BUNDLE_DIR.name)
    with pytest.raises(RuntimeError, match="something we never named"):
        tools["read_dir"].func(bundle_id=BUNDLE_DIR.name, path="x")


# --- (6) a successful answer can never be mistaken for a refusal --------------------------------


def test_a_successful_listing_carries_no_refusal_key() -> None:
    """(6) The other half of "a refusal a caller cannot tell from an answer is worthless"."""
    listing = _tools(BUNDLE_DIR)["read_bundle"].func(bundle_id=BUNDLE_DIR.name)
    assert "refused" not in listing and "refusal" not in listing
    assert listing["documents"]