"""叙事分区、口述过短回退、配图字数门闸（纯函数/无 DB）。"""

import pytest

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_should_fallback_to_transcript_short_md(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setattr(sps.settings, "memoir_narrative_fallback_body_ratio", 0.5)
    monkeypatch.setattr(sps.settings, "memoir_narrative_fallback_min_chars", 20)
    oral = "我一九九九年出生在上海，后来全家搬到苏州生活了好几年。"
    assert sps._should_fallback_to_transcript("1999", oral) is True
    assert sps._should_fallback_to_transcript(oral, oral) is False


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_json_too_short_returns_oral(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    monkeypatch.setattr(sps.settings, "memoir_narrative_fallback_body_ratio", 0.5)
    monkeypatch.setattr(sps.settings, "memoir_narrative_fallback_min_chars", 20)
    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"}]}'
    out, _ft = sps._apply_narrative_fallbacks(
        raw,
        oral,
        "",
        chapter_category="childhood",
    )
    assert out.strip() == oral


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