"""Broad-quantifier reminder text + governance hash binding.

Ticket #000008 Phase 3. Default-OFF mechanism — operator opts in
per-call via ``quantifier_reminder_enabled=True`` in policy. Tests
pin the reminder generator's behavior and the policy field's
inclusion in ``_VERIFIER_POLICY_FIELDS`` so flipping it bumps
``governance_policy_hash``.

Bench-first per §10.8 decision tree: enable default-on only after
a bench cycle shows ≥5pp delta on FORMAT_COLLAPSED or pointer-loss
rate.
"""

from __future__ import annotations

import pytest

from arborist.qa.keys import _VERIFIER_POLICY_FIELDS, verifier_policy_hash
from arborist.qa.quantifier_reminder import broad_quantifier_reminder


# ---------------------------------------------------------------- gating

@pytest.mark.parametrize("intensity", [
    "SINGULAR", "PROPORTIONAL", "FEW", "MANY",
    "SMALL_NUM_EXPLICIT", "COMPARATIVE_BOUND", "ABSENT",
])
def test_non_broad_intensity_returns_none(intensity):
    """Reminder only fires for ALL/COMPREHENSIVE/OPEN_REQUEST."""
    out = broad_quantifier_reminder(
        intensity=intensity, cap=8, scope_bound_hint="unbounded",
    )
    assert out is None


@pytest.mark.parametrize("intensity", ["ALL", "COMPREHENSIVE", "OPEN_REQUEST"])
def test_broad_intensity_with_cap_produces_reminder(intensity):
    out = broad_quantifier_reminder(
        intensity=intensity, cap=8, scope_bound_hint="unbounded",
    )
    assert out is not None
    assert "8" in out
    assert "broad-quantifier query" in out


def test_none_cap_returns_none():
    """Defensive — guard upstream may fail to extract a cap; reminder
    declines rather than render an ill-formed 'at most None'."""
    out = broad_quantifier_reminder(
        intensity="ALL", cap=None, scope_bound_hint="unbounded",
    )
    assert out is None


def test_zero_or_negative_cap_returns_none():
    """Same defensive — non-positive caps shouldn't render."""
    assert broad_quantifier_reminder(
        intensity="ALL", cap=0, scope_bound_hint="unbounded",
    ) is None
    assert broad_quantifier_reminder(
        intensity="ALL", cap=-1, scope_bound_hint="unbounded",
    ) is None


def test_none_intensity_returns_none():
    out = broad_quantifier_reminder(
        intensity=None, cap=8, scope_bound_hint="unbounded",
    )
    assert out is None


# ---------------------------------------------------------------- bounded vs unbounded

def test_bounded_universe_uses_bounded_template():
    """Bounded universals (e.g. all members of the Beatles, year-
    anchored) get a softer reminder — no 'do not enumerate from
    training prior' clause, since the corpus has the answer set."""
    bounded = broad_quantifier_reminder(
        intensity="ALL", cap=4, scope_bound_hint="bounded",
    )
    unbounded = broad_quantifier_reminder(
        intensity="ALL", cap=4, scope_bound_hint="unbounded",
    )
    assert "bounded universe" in bounded
    assert "training prior" not in bounded
    # Unbounded reminder is the stricter shape with the no-prior
    # clause and the under-specified-scope warning.
    assert "training prior" in unbounded
    assert "under-specified" in unbounded


def test_unknown_scope_treated_as_unbounded():
    """When the classifier can't decide bounded vs unbounded, default
    to the stricter (unbounded) reminder. Better to over-warn than
    under-warn on a broad-intensity question."""
    out = broad_quantifier_reminder(
        intensity="ALL", cap=8, scope_bound_hint="unknown",
    )
    assert "training prior" in out


# ---------------------------------------------------------------- cap interpolation

def test_cap_appears_verbatim_in_reminder():
    """The cap N must appear in the reminder text so the model knows
    its budget. Pin the literal cap string so a typo in the template
    surfaces here."""
    for cap in (1, 5, 8, 12, 50):
        out = broad_quantifier_reminder(
            intensity="ALL", cap=cap, scope_bound_hint="unbounded",
        )
        assert str(cap) in out


def test_reminder_demands_bracket_citations():
    """The reminder must restate the [E\\d+] citation rule so the
    model doesn't drop pointer tags under enumeration pressure."""
    out = broad_quantifier_reminder(
        intensity="ALL", cap=8, scope_bound_hint="unbounded",
    )
    assert "[E5]" in out  # template uses [E5] as the example


# ---------------------------------------------------------------- governance binding

def test_quantifier_reminder_enabled_is_in_verifier_policy_fields():
    """Flipping the reminder switch must invalidate prior cache
    records — without this binding an operator could enable the
    reminder and silently re-use cached pre-reminder verdicts."""
    assert "quantifier_reminder_enabled" in _VERIFIER_POLICY_FIELDS


def test_governance_hash_changes_when_reminder_flips():
    base_policy = dict.fromkeys(_VERIFIER_POLICY_FIELDS, "default")
    base_policy["quantifier_reminder_enabled"] = False
    h_off = verifier_policy_hash(base_policy)
    base_policy["quantifier_reminder_enabled"] = True
    h_on = verifier_policy_hash(base_policy)
    assert h_off != h_on