"""S2.0 load-bearing seam (målbilde §1/§5/§7): the portfolio must learn ACROSS projects — a verdict
captured on project *k* MUST reach project *k+1*'s hypothesis prompt.

Before Fase 2a, ``run_portfolio`` called ``run_project`` WITHOUT ``bundle_dir``/``verdict_dir``, so
the ``bundle_dir``-gated Step-1 ExpeL fold never fired on the portfolio path and the store-threaded
verdict never reached the next hypothesis — an honesty breach, since ``run_portfolio``'s docstring
already claimed a "cross-project learning loop".

Topology (road-*k* + bundle-*(k+1)*, ONE bundle): project *k* is road-backed (``docs_dir``,
``bundle_dir=None``); project *k+1* is bundle-backed (``bundle_dir`` = the repo-local mini-bundle,
``id`` = its IR ``project_id``). *k*'s scripted proposal shares *k+1*'s candidate features (code
``ENERGI-TOTAL-EL``, magnitude ~18000), so *k*'s captured verdict is what *k+1*'s ExpeL query
retrieves. The marker is a SENTINEL absent from the bundle — its presence in *k+1*'s prompt can only
come from *k*'s verdict via the threaded store (detach the threading in run.py:496 → RED).
"""

from __future__ import annotations

from importlib.resources import files

import pytest

from portfolio_optimiser.contracts import GoalContract
from portfolio_optimiser.reference_domain import Project
from portfolio_optimiser.run import _goal_limit_if_reached, run_portfolio
from portfolio_optimiser.verdicts import ProposalFeatures, capture_verdict, write_verdict

_MINI_BUNDLE = str(files("portfolio_optimiser").joinpath("data/bundles/bygg-energi-mikro-a"))

# A VALID proposal whose features align with the mini-bundle candidate (code ENERGI-TOTAL-EL,
# magnitude ~18000): affected total 180000 x 1.0, no assumptions -> degenerate Monte Carlo
# P90 = 0.30 x 180000 = 54000 >= claimed 18000 -> validates on the first attempt.
_ALIGNED_REPLY = (
    '{"measure":"LED-retrofit av kontorbelysning","affected_items":'
    '[{"code":"ENERGI-TOTAL-EL","quantity":180000,"unit_cost":1.0}],"claimed_saving_nok":18000}'
)

# Markers absent from the bundle: presence in a prompt/store can only come via the threaded seams.
_SENTINEL = "SENTINEL-XPROJ-4a9f2b realiseringskorreksjon fra prosjekt k"
_INBOX_SENTINEL = "SENTINEL-INBOX-7c3e1d dropped-after-run realiseringskorreksjon"


def _generation_prompts(sink: list[str]) -> list[str]:
    """The generation-call prompts (``generate._build_messages`` embeds 'SavingsProposal'),
    isolated from the debate-round prompts also captured in the shared sink."""
    return [p for p in sink if "SavingsProposal" in p]


def _make_docs(tmp_path, name: str) -> str:
    """A tmp docs folder with citable content, so the road path retrieval is non-empty."""
    d = tmp_path / name
    d.mkdir()
    (d / "cost.txt").write_text(
        "Asphalt Ab11 unit rate renegotiation reduced the paving cost on the school stretch.",
        encoding="utf-8",
    )
    return str(d)


def _road_k(tmp_path, *, rationale: str) -> Project:
    return Project(
        id="ROAD-K",
        name="Road k",
        description="road-backed project k",
        currency="NOK",
        cost_items=(),
        docs_dir=_make_docs(tmp_path, "k-docs"),
        verdict_input={"decision": "approved", "rationale": rationale},
        bundle_dir=None,
        verdict_dir=None,
    )


def _bundle_kplus1(tmp_path, *, verdict_dir: str | None = None) -> Project:
    return Project(
        id="BYGG-ENERGI-MIKRO-A",
        name="Bundle k+1",
        description="bundle-backed project k+1",
        currency="NOK",
        cost_items=(),
        docs_dir=_make_docs(tmp_path, "kplus1-docs"),
        verdict_input={"decision": "approved", "rationale": "k+1 reviewed (sim)"},
        bundle_dir=_MINI_BUNDLE,
        verdict_dir=verdict_dir,
    )


async def test_verdict_on_k_reaches_kplus1_hypothesis_prompt(
    tmp_path, monkeypatch, make_recording_client_factory
) -> None:
    """T-2.0a LOAD-BEARING: a verdict captured on road-backed project *k* reaches bundle-backed
    *k+1*'s hypothesis-generation prompt (both the sentinel rationale and *k*'s verdict id, via the
    ExpeL few-shot). Detach ``bundle_dir=project.bundle_dir`` at run.py:496 → *k+1* runs the road
    path → the Step-1 fold is skipped → the sentinel never arrives → RED."""
    k = _road_k(tmp_path, rationale=_SENTINEL)
    kplus1 = _bundle_kplus1(tmp_path)
    monkeypatch.setattr("portfolio_optimiser.run.load_reference_projects", lambda: (k, kplus1))
    factory, recorded = make_recording_client_factory(_ALIGNED_REPLY)

    result = await run_portfolio(profile="local", client_factory=factory)

    # k ran first and its captured verdict carries the sentinel (its rationale is verbatim).
    assert result.runs[0].verdict.rationale == _SENTINEL
    k_verdict_id = result.runs[0].verdict.id

    gen_prompts = _generation_prompts(recorded)
    assert gen_prompts, "the generation calls must have happened"
    assert any(_SENTINEL in p for p in gen_prompts), (
        "k's verdict rationale did not reach k+1's hypothesis prompt — the bundle_dir threading in "
        "run_portfolio is detached (no cross-project ExpeL fold)"
    )
    assert any(k_verdict_id in p for p in gen_prompts), (
        "k's verdict id did not reach the hypothesis prompt via the ExpeL few-shot"
    )


async def test_kplus1_alone_against_fresh_store_carries_no_signal(
    tmp_path, monkeypatch, make_recording_client_factory
) -> None:
    """T-2.0b CAUSALITY CONTROL: running ONLY *k+1* against a fresh (empty) store carries the
    sentinel into NO prompt — proving the signal in T-2.0a is caused by the threaded store, not
    incidental to the fixture (makes the positive test genuinely load-bearing)."""
    k = _road_k(tmp_path, rationale=_SENTINEL)
    kplus1 = _bundle_kplus1(tmp_path)
    monkeypatch.setattr("portfolio_optimiser.run.load_reference_projects", lambda: (k, kplus1))
    factory, recorded = make_recording_client_factory(_ALIGNED_REPLY)

    # project_ids restricts the pass to k+1 alone; the default store is empty.
    await run_portfolio(["BYGG-ENERGI-MIKRO-A"], "local", client_factory=factory)

    assert all(_SENTINEL not in p for p in recorded), (
        "the sentinel reached a prompt with no project-k verdict in the store — the positive test "
        "is not actually load-bearing"
    )


async def test_dropped_verdict_in_kplus1_inbox_reaches_store(
    tmp_path, monkeypatch, make_recording_client_factory
) -> None:
    """T-2.0d LOAD-BEARING (verdict_dir threading): a verdict dropped as a FILE in *k+1*'s
    ``verdict_dir`` inbox (an expert/persona authoring after an earlier run) is merged into the
    store on the portfolio path. Detach ``verdict_dir=project.verdict_dir`` at run.py:496 → the file
    is never read → the dropped verdict never reaches the store → RED. Reuses the Step-7-proven
    ``run_project`` merge (run.py:254-257) at the portfolio level."""
    inbox = tmp_path / "kplus1-inbox"
    inbox.mkdir()
    # DISTINCT features from k's aligned proposal, so the dropped verdict's content-hash id does NOT
    # collide with k's captured verdict — otherwise the store's first-write-wins would drop it and
    # the test would fail for the wrong reason (id collision, not a detached seam).
    dropped = capture_verdict(
        ProposalFeatures(
            affected_codes=frozenset({"INBOX-ONLY-XY"}),
            measure_type="inbox-only measure (post-run drop)",
            claimed_saving_nok=99000.0,
        ),
        "approved",
        _INBOX_SENTINEL,
    )
    write_verdict(str(inbox), dropped)

    k = _road_k(tmp_path, rationale=_SENTINEL)
    kplus1 = _bundle_kplus1(tmp_path, verdict_dir=str(inbox))
    monkeypatch.setattr("portfolio_optimiser.run.load_reference_projects", lambda: (k, kplus1))
    factory, _recorded = make_recording_client_factory(_ALIGNED_REPLY)

    result = await run_portfolio(profile="local", client_factory=factory)

    assert any(_INBOX_SENTINEL in v.rationale for v in result.store.verdicts), (
        "a verdict dropped as a file in k+1's verdict_dir inbox did not reach the store — the "
        "verdict_dir threading in run_portfolio is detached"
    )


def test_percent_goal_against_zero_baseline_raises_value_error() -> None:
    """T-2.0c (direct unit test of the chokepoint): a percent goal against a non-positive baseline is
    meaningless — ``int(percent/100 * 0) == 0`` would falsely read as 'goal reached'. The guard in
    ``_goal_limit_if_reached`` raises ``ValueError`` instead. Detach the guard → no raise (false
    'reached') → RED. Tested DIRECTLY on the function: ``_goal_limit_if_reached`` is only called
    inside a non-empty loop with ``baseline=sum(total_cost)``, and no reference project has zero
    cost, so a baseline-0 path is not constructable via ``run_portfolio`` — the direct call is the
    unambiguous, constructable test."""
    goal = GoalContract(percent=10.0)
    with pytest.raises(ValueError):
        _goal_limit_if_reached(goal, observed_ore=0, baseline_ore=0)