"""MarkdownSplitter 边界测试."""
import pytest
from src.core.splitters import MarkdownSplitter


class TestMarkdownSplitterEdgeCases:
    """Markdown 分块边界情况."""

    @pytest.fixture
    def splitter(self):
        return MarkdownSplitter(max_size=1000, overlap=100)

    def test_no_headings_document(self, splitter):
        """无标题文档正常分块."""
        md = "这是一段没有标题的纯文本。\n\n第二段内容。"
        chunks = splitter.split(md, source_file="nohead.md")
        assert len(chunks) >= 1

    def test_deep_headings(self, splitter):
        """h4-h6 深层标题."""
        md = "# 一级\n## 二级\n### 三级\n#### 四级\n内容在这里。\n##### 五级\n更多内容。\n###### 六级\n最深的内容。"
        chunks = splitter.split(md, source_file="deep.md")
        assert len(chunks) >= 1

    def test_hash_in_code_block_not_heading(self, splitter):
        """代码块中的 # 号不被误识别为标题."""
        md = "# 真实标题\n这是内容。\n```python\n# 这不是标题，是注释\nx = 1\n## 这也不是标题\n```\n更多内容。"
        chunks = splitter.split(md, source_file="codehash.md")
        section_titles = [c.get("section_title", "") for c in chunks]
        for title in section_titles:
            assert "不是标题" not in title

    def test_adjacent_headings_empty_content(self, splitter):
        """标题后紧接标题（空内容）."""
        md = "# 标题 A\n# 标题 B\n内容 B。"
        chunks = splitter.split(md, source_file="adjacent.md")
        assert len(chunks) >= 1

    def test_only_headings_no_content(self, splitter):
        """仅有标题无正文."""
        md = "# 只有标题\n## 没有内容"
        chunks = splitter.split(md, source_file="headingsonly.md")
        assert isinstance(chunks, list)