"""B07 유역도 메모리 — 배경선 배열 캐시 · 도곽 밖 선 거름 · 종이 0.1 mm 솎기 (59-4)."""

import json

from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Basin import _thinned
from B07_DesignDetail.B07_DesignDetail_Router_Support_Basin import _metric_lines


def test_metric_lines_filters_by_box(tmp_path) -> None:
    path = tmp_path / "lines.geojson"
    inside = [[0.0, 0.0], [1.0, 1.0], [2.0, 0.5]]
    outside = [[50.0, 50.0], [51.0, 51.0]]
    path.write_text(
        json.dumps(
            {
                "type": "FeatureCollection",
                "features": [
                    {"geometry": {"type": "LineString", "coordinates": inside}},
                    {"geometry": {"type": "LineString", "coordinates": outside}},
                ],
            }
        ),
        encoding="utf-8",
    )
    every = _metric_lines(path, "EPSG:4326")
    assert every == [[tuple(p) for p in inside], [tuple(p) for p in outside]]
    assert _metric_lines(path, "EPSG:4326", (-1.0, -1.0, 5.0, 5.0)) == every[:1]
    assert _metric_lines(tmp_path / "none.geojson", "EPSG:4326") == []


def test_thinned_drops_sub_pen_wiggles() -> None:
    points = [(x * 0.5, 0.02 if x % 2 else 0.0) for x in range(21)]
    thinned = _thinned(points)
    assert thinned[0] == points[0] and thinned[-1] == points[-1]
    assert len(thinned) == 2
    bend = [(0.0, 0.0), (5.0, 1.0), (10.0, 0.0)]
    assert _thinned(bend) == bend