"""표제란 SVG 서명을 CAD 폴리선으로 바꾸는 경로 검사 (2026-09-03 사용자 결정).

종전에는 `ImageEntity`(data URL)로 들어가 DXF 로 나가면 래스터가 됐다. SVG 만 벡터로
바꾸고 PNG·JPG 는 그대로 그림으로 둔다.
"""

from base64 import b64encode

from B07_DesignDetail.B07_DesignDetail_Engine_Cad_Svg import fit_polylines, svg_polylines
from B07_DesignDetail.B07_DesignDetail_Engine_Template import _vectorize_svg_image

SIGN_SVG = (
    '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 50">'
    '<path d="M 10 40 L 30 10 L 50 40"/>'
    '<polyline points="60,10 90,10 90,40"/>'
    "</svg>"
)


def _image_entity(payload: str, mime: str = "image/svg+xml") -> dict:
    return {
        "id": "sign-1",
        "type": "Image",
        "lineColor": "#101010",
        "lineWidth": 1,
        "layerId": "title",
        "shapeData": {
            "points": [
                {"x": 10.0, "y": 20.0},
                {"x": 50.0, "y": 20.0},
                {"x": 50.0, "y": 40.0},
                {"x": 10.0, "y": 40.0},
            ],
            "imageData": f"data:{mime};base64,{b64encode(payload.encode()).decode()}",
        },
    }


def test_svg_polylines_reads_path_and_polyline():
    view_box, runs = svg_polylines(SIGN_SVG)
    assert view_box == (0.0, 0.0, 100.0, 50.0)
    assert len(runs) == 2
    assert runs[0][0] == (10.0, 40.0) and runs[0][-1] == (50.0, 40.0)


def test_fit_keeps_aspect_and_flips_y():
    """비율을 지키고 세로를 뒤집는다 — SVG 는 y 가 아래로, 도면은 위로 자란다."""
    view_box, runs = svg_polylines(SIGN_SVG)
    fitted = fit_polylines(runs, view_box, (10.0, 20.0, 50.0, 40.0))
    xs = [x for run in fitted for x, _y in run]
    ys = [y for run in fitted for _x, y in run]
    assert 10.0 - 1e-9 <= min(xs) and max(xs) <= 50.0 + 1e-9
    assert 20.0 - 1e-9 <= min(ys) and max(ys) <= 40.0 + 1e-9
    # SVG 에서 y=10(위)이던 꼭짓점이 도면에서는 가장 높은 y 가 된다.
    assert fitted[0][1][1] > fitted[0][0][1]


def test_image_entity_becomes_polylines():
    result = _vectorize_svg_image(_image_entity(SIGN_SVG))
    assert all(entity["type"] == "PolyLine" for entity in result)
    assert len(result) == 2
    assert all(entity["layerId"] == "title" for entity in result)
    assert result[0]["children"], "폴리선에 선분이 없다"


def test_raster_image_is_left_alone():
    raster = _image_entity("not-svg", mime="image/png")
    assert _vectorize_svg_image(raster) == [raster]


def test_broken_svg_keeps_image():
    broken = _image_entity("<svg><path d=")
    assert _vectorize_svg_image(broken) == [broken]