from ocr_app.pdf_text import TextLayerPolicy, assess_text_layer, normalize_text


def test_normalize_text():
    assert normalize_text("a  b\r\n\r\n\r\nc") == "a b\n\nc"


def test_usable_text_layer():
    text = "有效电子文档内容 123 " * 20
    result = assess_text_layer(
        text,
        width_points=595,
        height_points=842,
        policy=TextLayerPolicy(),
    )
    assert result.usable
    assert result.reason == "usable_text_layer"


def test_empty_text_layer_routes_to_ocr():
    result = assess_text_layer(
        "",
        width_points=595,
        height_points=842,
        policy=TextLayerPolicy(),
    )
    assert not result.usable
    assert result.reason == "empty_text_layer"


def test_short_text_layer_routes_to_ocr():
    result = assess_text_layer(
        "页码 1",
        width_points=595,
        height_points=842,
        policy=TextLayerPolicy(min_chars=50),
    )
    assert not result.usable
    assert result.reason == "too_few_characters"