from fam_edge.frame_service import _bbox_to_pixels


def test_bbox_to_pixels_basic():
    # [ymin,xmin,ymax,xmax] 0-1000 归一化 -> 像素 (x1,y1,x2,y2)
    # 实测样本：Gemini 对 440x248 帧返回 [0, 690, 203, 725]，
    # 对应画面右上角门厅处的一个人（今天用真实截图验证过）。
    x1, y1, x2, y2 = _bbox_to_pixels([0, 690, 203, 725], 440, 248)
    assert x1 == int(690 / 1000 * 440)
    assert y1 == 0
    assert x2 == int(725 / 1000 * 440)
    assert y2 == int(203 / 1000 * 248)


def test_bbox_to_pixels_full_frame():
    x1, y1, x2, y2 = _bbox_to_pixels([0, 0, 1000, 1000], 400, 300)
    assert (x1, y1, x2, y2) == (0, 0, 400, 300)


def test_bbox_to_pixels_zero_area():
    x1, y1, x2, y2 = _bbox_to_pixels([500, 500, 500, 500], 400, 300)
    assert (x1, y1) == (x2, y2)