"""물넘이포장 노면 경사 = 좌측 패널 경사각(°) → %(PLAN 66-2).

경사각이 있으면 그 값 · 없으면 옛 「바닥 경사(%)」 · 둘 다 없으면 기본 3°.
"""

import math

from B06_Section.B06_Section_Engine_Culvert import _ford_pavement_set


def test_slope_degree_becomes_percent() -> None:
    spec = _ford_pavement_set({"ford_height_m": 0.3, "ford_slope_deg": 5})
    assert spec["slope_pct"] == round(math.tan(math.radians(5)) * 100, 4)
    assert not any("경사각" in item for item in spec["defaulted"])


def test_slope_defaults_to_three_degrees() -> None:
    spec = _ford_pavement_set({"ford_height_m": 0.3})
    assert spec["slope_pct"] == round(math.tan(math.radians(3)) * 100, 4)
    assert "경사각 3" in spec["defaulted"]


def test_legacy_percent_kept_without_degree() -> None:
    spec = _ford_pavement_set({"ford_height_m": 0.3, "ford_slope_pct": 2.0})
    assert spec["slope_pct"] == 2.0