# ============================================================
# SC-06 敏感性分析黄金测试
# ============================================================
from __future__ import annotations

import json

from server.aps_domain.sensitivity import run_sensitivity
from server.state.seed import seed_world


def test_sensitivity_does_not_mutate_world():
    world = seed_world()
    before = json.dumps(world, ensure_ascii=False, sort_keys=True)
    report = run_sensitivity(world, strategy="COMPREHENSIVE")
    after = json.dumps(world, ensure_ascii=False, sort_keys=True)
    assert before == after
    assert report["baseline"]["poCount"] >= 1
    assert len(report["rows"]) >= 4
    assert report["rows"][0]["swing"] >= report["rows"][-1]["swing"]
    assert "Tornado" in report["markdown"]


def test_sensitivity_buffer_affects_tardiness_direction():
    """更紧的交期缓冲（0.85）相对 1.0 不应减少延期（通常升高或持平）。"""
    world = seed_world()
    report = run_sensitivity(world, strategy="COMPREHENSIVE")
    buf = next(r for r in report["rows"] if r["factorId"] == "deliveryBufferRatio")
    # low=0.85（更紧）, high=1.00（更松）
    assert buf["low"]["tardiness"] >= buf["high"]["tardiness"] - 1e-6


def test_sensitivity_efficiency_low_worsens_or_equals():
    world = seed_world()
    report = run_sensitivity(world, strategy="FIFO")
    eff = next(r for r in report["rows"] if r["factorId"] == "lineEfficiency")
    # 效率×0.8 相对 ×1.2：延期不应更低
    assert eff["low"]["tardiness"] >= eff["high"]["tardiness"] - 1e-6