"""章节读路径 prepare_chapter_read_view：不写库、临时物化串用于列表/详情。"""

from unittest.mock import MagicMock, patch

from app.features.memoir.reading_segment_materialize import (
    chapter_meets_minimum_display,
)
from app.features.memoir.service import prepare_chapter_read_view


def test_prepare_not_dirty_no_override() -> None:
    ch = MagicMock()
    ch.markdown_compose_dirty = False
    ch.reading_segments_json = None
    ch.story_links = [MagicMock()]
    c, md = prepare_chapter_read_view(ch)
    assert c is ch
    assert md is None


def test_prepare_dirty_with_snapshot_no_override() -> None:
    ch = MagicMock()
    ch.markdown_compose_dirty = True
    ch.reading_segments_json = [{"story_id": "s1", "body_markdown": "x" * 400}]
    ch.story_links = [MagicMock()]
    c, md = prepare_chapter_read_view(ch)
    assert md is None


def test_prepare_dirty_no_snapshot_no_links_no_override() -> None:
    ch = MagicMock()
    ch.markdown_compose_dirty = True
    ch.reading_segments_json = None
    ch.story_links = []
    c, md = prepare_chapter_read_view(ch)
    assert md is None


def test_prepare_dirty_no_snapshot_with_links_uses_materialize() -> None:
    ch = MagicMock()
    ch.markdown_compose_dirty = True
    ch.reading_segments_json = None
    ch.story_links = [MagicMock()]
    fake_md = "正文" * 200
    with patch(
        "app.features.memoir.service.materialize_chapter_markdown_from_loaded_chapter",
        return_value=fake_md,
    ) as m:
        c, md = prepare_chapter_read_view(ch)
    m.assert_called_once_with(ch)
    assert md == fake_md.strip()
    assert c is ch


def test_chapter_meets_minimum_uses_override() -> None:
    ch = MagicMock()
    ch.canonical_markdown = ""
    long_md = "字" * 400
    assert (
        chapter_meets_minimum_display(ch, canonical_markdown_override=long_md) is True
    )
    assert chapter_meets_minimum_display(ch, canonical_markdown_override="短") is False