"""叙事分区、merge_shrink 回退、配图字数门闸（纯函数/无 DB）。"""

from app.agents.memoir.prompts import format_narrative_user_content
from app.features.memoir import story_pipeline_sync as sps


def test_format_narrative_user_content_oral_only() -> None:
    assert format_narrative_user_content("hello", "") == "【本段用户口述】\nhello"


def test_format_narrative_user_content_with_evidence() -> None:
    out = format_narrative_user_content("口述A", "摘录B")
    assert "【本段用户口述】" in out
    assert "口述A" in out
    assert "摘录B" in out
    assert "非本段口述" in out


def test_apply_narrative_fallbacks_merge_shrink_appends_oral() -> None:
    """整篇合并 JSON 输出过短：保留旧文并拼本段口述。"""
    long_existing = "x" * 500
    raw = '{"paragraphs": [{"content": "短"}]}'
    out, _ft = sps._apply_narrative_fallbacks(
        raw,
        "新口述补充",
        long_existing,
        chapter_category="childhood",
    )
    assert long_existing in out
    assert "新口述补充" in out


def test_apply_narrative_fallbacks_short_output_no_longer_falls_back() -> None:
    """短口述的正常改写不应被回退到口述原文。"""
    oral = "我1999年出生在上海，小学时爷爷常带我去河边散步。"
    raw = '{"paragraphs": [{"content": "1999年，我出生在上海。"}]}'
    out, ft = sps._apply_narrative_fallbacks(
        raw, oral, "", chapter_category="childhood"
    )
    assert ft == "none"
    assert "1999" in out


def test_coalesce_story_markdown_empty_md_falls_back_to_oral() -> None:
    """模型返回空 paragraphs 时仍回退到口述原文。"""
    md = sps._coalesce_story_markdown("", "口述原文", "")
    assert md == "口述原文"


def test_coalesce_story_markdown_nonempty_md_kept() -> None:
    """非空改写不再按字数比例回退。"""
    md = sps._coalesce_story_markdown("改写后的短文本", "原始口述比较长的一段话", "")
    assert md == "改写后的短文本"


def test_memoir_image_settings_min_body_field() -> None:
    from app.features.memoir.memoir_images.settings import MemoirImageSettings

    cfg = MemoirImageSettings(story_image_min_body_chars=799)
    assert cfg.story_image_min_body_chars == 799