from intent.features.diff import line_diff
from intent.markdown import render


def test_blocks_carry_source_lines():
    html = render("Para one\ncontinues.\n\n- a\n- b\n")
    assert '<p data-source-lines="1-2">' in html
    assert '<li data-source-lines="4-4">' in html


def test_headings_shift_down_one_level():
    html = render("# Top\n\n###### Deepest\n")
    assert "<h2" in html and "<h1" not in html
    assert "<h6" in html


def test_raw_html_and_script_links_are_neutralised():
    html = render("<script>alert(1)</script>\n\n[x](javascript:alert(1)) <img src=x onerror=y>")
    assert "<script" not in html
    assert "javascript:" not in html.replace("[x](javascript:alert(1))", "")
    assert "onerror" not in html.replace("onerror=y&gt;", "")


def test_remote_images_are_dropped():
    assert "<img" not in render("![pixel](https://tracker.example/p.gif)")


def test_tables_and_strikethrough():
    html = render("| a |\n|---|\n| 1 |\n\n~~old~~")
    assert "<table" in html and "<s>old</s>" in html


def test_line_diff_hunks():
    old = "\n".join(f"line {i}" for i in range(1, 21))
    new = old.replace("line 10", "line ten")
    [hunk] = line_diff(old, new)
    kinds = [(line.kind, line.old_number, line.new_number) for line in hunk]
    assert ("removed", 10, None) in kinds
    assert ("added", None, 10) in kinds
    assert kinds[0] == ("same", 7, 7)  # three lines of context
    assert line_diff(old, old) == []


def test_blocks_split_top_level_markdown_with_line_ranges():
    from intent.markdown import render_blocks, source_lines

    text = "# Title\n\nPara one\ncontinues.\n\n- a\n- b\n\n```\ncode\n```\n"
    blocks = render_blocks(text)
    assert [(b.start, b.end) for b in blocks] == [(1, 1), (3, 4), (6, 7), (9, 11)]
    assert blocks[0].anchor == "L1-1" and "<h2" in blocks[0].html
    assert "<li" in blocks[2].html and "<li" not in blocks[1].html
    assert source_lines(text, 3, 4) == "Para one\ncontinues."


def test_heading_base_is_adjustable():
    assert "<h3" in render("# Deep", heading_base=3)
    # The shallowest heading lands on the base level, keeping relative structure.
    html = render("## Two\n\n### Three\n")
    assert "<h2" in html and "<h3" in html and "<h4" not in html