import unittest

from app.features.memoir.chapter_markdown_compose import (
    compose_ordered_stories_to_markdown,
    materialize_chapter_markdown_from_loaded_chapter,
)


class ChapterMarkdownComposeTest(unittest.TestCase):
    def test_orders_and_separates_with_headings(self):
        md = compose_ordered_stories_to_markdown(
            [("第一章", "正文A"), ("第二章", "正文B")]
        )
        self.assertIn("## 第一章", md)
        self.assertIn("正文A", md)
        self.assertIn("## 第二章", md)
        self.assertIn("正文B", md)
        self.assertIn("\n\n---\n\n", md)
        self.assertTrue(md.index("正文A") < md.index("---"))
        self.assertTrue(md.index("---") < md.index("第二章"))
        self.assertTrue(md.index("第一章") < md.index("第二章"))

    def test_preserves_asset_refs(self):
        body = "![x](asset://abc-123)"
        md = compose_ordered_stories_to_markdown([("S", body)])
        self.assertIn("asset://abc-123", md)

    def test_empty_title_uses_fallback(self):
        md = compose_ordered_stories_to_markdown([("", "仅正文")])
        self.assertIn("## 故事", md)

    def test_empty_body_keeps_heading_only(self):
        md = compose_ordered_stories_to_markdown([("仅标题", "")])
        self.assertEqual(md, "## 仅标题")

    def test_materialize_respects_order_index(self):
        class _S:
            def __init__(self, title: str, body: str):
                self.title = title
                self.canonical_markdown = body

        class _L:
            def __init__(self, o: int, story: _S):
                self.order_index = o
                self.story = story

        ch = type(
            "Ch",
            (),
            {
                "story_links": [
                    _L(1, _S("B", "后")),
                    _L(0, _S("A", "先")),
                ]
            },
        )()
        md = materialize_chapter_markdown_from_loaded_chapter(ch)
        self.assertLess(md.index("先"), md.index("后"))