"""S5.2 — Varsling: unit/contract tests for ``notify.py`` (Notifier protocol + notifiers).

Detach-seam (RED-when-detached) twins live in ``tests/test_notify_loadbearing.py``. Tests may
import MAF-tainted modules freely (``verdicts``) — only ``notify.py`` itself must stay MAF-free.
"""

from __future__ import annotations

import io

from portfolio_optimiser.notify import ConsoleNotifier, Notifier
from portfolio_optimiser.verdicts import ProposalFeatures, Verdict, capture_verdict


def _verdict() -> Verdict:
    return capture_verdict(
        ProposalFeatures(
            affected_codes=frozenset({"05.2", "03.1"}),
            measure_type="scope_reduction",
            claimed_saving_nok=200_000.0,
            description="LED retrofit",
        ),
        "approved",
        "feasible within range",
    )


def test_plain_callable_satisfies_notifier() -> None:
    """The seam promise: any plain callable satisfies the runtime-checkable ``Notifier`` protocol,
    so ``run_project(notify=lambda v: ...)`` stays valid — a structural superset of
    ``Callable[[Verdict], None]``, not a new ABC (needs ``@runtime_checkable``)."""
    assert isinstance(lambda v: None, Notifier)


def test_console_emits_id_and_decision() -> None:
    """ConsoleNotifier writes the verdict id + decision to the injected stream (never a URL)."""
    stream = io.StringIO()
    verdict = _verdict()
    ConsoleNotifier(stream=stream)(verdict)
    out = stream.getvalue()
    assert verdict.id in out
    assert verdict.decision in out