"""Golden tests for SCENARIO_SHOCK_MATRIX_V1 (governance/todo/v8_9_p2_adoption_plan.yaml P2-A).

Maps to v8.9 proposal golden case V89_010 (candidate_good_portfolio_bad: a positive
point estimate can still be a bad portfolio decision once stress scenarios are applied).
"""
from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
MODULE_PATH = ROOT / "tools" / "build_scenario_shock_matrix_v1.py"


def _load_module():
    spec = importlib.util.spec_from_file_location("build_scenario_shock_matrix_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_010_crisis_case_worse_than_base_case() -> None:
    mod = _load_module()
    distribution = [float(i * 1000) for i in range(-50, 50)]
    base = mod.evaluate_scenario(distribution, "base_case")
    crisis = mod.evaluate_scenario(distribution, "crisis_case")
    assert crisis["scenario_cvar95_krw"] < base["scenario_cvar95_krw"]


def test_missing_distribution_returns_data_missing_not_fabricated() -> None:
    mod = _load_module()
    result = mod.evaluate_scenario(None, "adverse_case")
    assert result["gate"] == "DATA_MISSING"
    assert result["scenario_ce70_krw"] is None


def test_all_six_scenarios_defined() -> None:
    mod = _load_module()
    assert set(mod.SCENARIO_DEFINITIONS.keys()) == {
        "base_case",
        "adverse_case",
        "liquidity_drought_case",
        "crisis_case",
        "fx_shock_case",
        "tax_cost_case",
    }