"""Golden tests for REBALANCE_CADENCE_GATE_V1 (governance/todo/v8_9_p3_adoption_plan.yaml P3-D).

Maps to v8.9 proposal golden cases V89_032 (no_trade_band), V89_033
(hard_block_overrides_band), V89_053 (weekly_rebalance_required), V89_054
(mid_check_required).
"""
from __future__ import annotations

import importlib.util
from datetime import date
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_rebalance_cadence_gate_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_rebalance_cadence_gate_v1", MODULE_PATH)
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(module)
    return module


def test_v89_032_negative_utility_no_hard_block_blocks_execution_but_emits_review() -> None:
    mod = _load_module()
    result = mod.evaluate_rebalance_gate(date(2026, 6, 20), -5000.0, False)
    assert result["review_emitted"] is True
    assert result["rebalance_execution_allowed"] is False


def test_v89_033_hard_risk_block_overrides_negative_utility() -> None:
    mod = _load_module()
    result = mod.evaluate_rebalance_gate(date(2026, 6, 20), -5000.0, True)
    assert result["rebalance_execution_allowed"] is True


def test_v89_053_saturday_and_sunday_always_require_cadence_check() -> None:
    mod = _load_module()
    saturday_required, saturday_reason = mod.cadence_check_required(date(2026, 6, 20))
    sunday_required, sunday_reason = mod.cadence_check_required(date(2026, 6, 21))
    assert saturday_required is True
    assert saturday_reason == "weekly_rebalance_required"
    assert sunday_required is True


def test_v89_054_monthly_mid_check_days_require_cadence_check() -> None:
    mod = _load_module()
    required, reason = mod.cadence_check_required(date(2026, 6, 11))
    assert required is True
    assert reason == "mid_check_required"


def test_non_cadence_weekday_does_not_require_check() -> None:
    mod = _load_module()
    required, _ = mod.cadence_check_required(date(2026, 6, 17))
    assert required is False