from edge.zones import zones_from_config, thresholds_from_config

def test_parses_zone_rows_json_string_polygon():
    cfg = {"zones": [
        {"zone_id": "z1", "camera_id": "cam-1", "level": "restricted",
         "polygon_json": "[[0,0],[9,0],[9,9]]"},
    ], "thresholds": {"fall_prone_s": 3.0}}
    zones = zones_from_config(cfg)
    assert len(zones) == 1
    assert zones[0].zone_id == "z1"
    assert zones[0].level == "restricted"
    assert zones[0].polygon == [(0.0, 0.0), (9.0, 0.0), (9.0, 9.0)]
    assert thresholds_from_config(cfg)["fall_prone_s"] == 3.0

def test_skips_malformed_row():
    cfg = {"zones": [{"zone_id": "bad"}], "thresholds": {}}
    assert zones_from_config(cfg) == []

def test_empty_config():
    assert zones_from_config({}) == []
    assert thresholds_from_config({}) == {}

def test_skips_short_point_without_crashing():
    cfg = {"zones": [
        {"zone_id": "bad", "camera_id": "c", "level": "restricted", "polygon_json": "[[0,0],[9],[9,9]]"},
        {"zone_id": "ok", "camera_id": "c", "level": "restricted", "polygon_json": "[[0,0],[9,0],[9,9]]"},
    ]}
    zones = zones_from_config(cfg)
    # bad row skipped, good row survives -- function did not crash
    assert [z.zone_id for z in zones] == ["ok"]

def test_non_iterable_zones_returns_empty():
    assert zones_from_config({"zones": 5}) == []