"""Cascade mask math — EoMT primary, incumbent arbitrating sidewalk/earth only.

Pure-function tests (no model, no network) over one pixel per scenario.
"""

from __future__ import annotations

import numpy as np

from lawn_estimator.config import Config
from lawn_estimator.segmentation import combine_cascade


def test_cascade_scenarios():
    # columns:            grass  sidewalk+open  earth+open  earth+roof  road+open  tree
    primary = np.array([[9,     11,            13,         13,         6,         4]])
    arbiter = np.array([[7,     1,             1,          7,          1,         4]])

    lawn, canopy = combine_cascade(primary, arbiter)

    assert lawn[0, 0]       # EoMT grass counts regardless of arbiter
    assert lawn[0, 1]       # parkway strip: EoMT sidewalk, incumbent open → reclaimed
    assert lawn[0, 2]       # dormant/shadowed turf: EoMT earth, incumbent open → reclaimed
    assert not lawn[0, 3]   # EoMT earth but incumbent says roof → stays out
    assert not lawn[0, 4]   # road is NOT arbitrated even if incumbent said open
    assert lawn[0, 5]       # EoMT tree = canopy counts
    assert canopy.tolist() == [[False, False, False, False, False, True]]


def test_cascade_flag_defaults_off(monkeypatch):
    monkeypatch.delenv("LAWN_CASCADE", raising=False)
    assert Config().lawn_cascade is False
    monkeypatch.setenv("LAWN_CASCADE", "1")
    assert Config().lawn_cascade is True