"""Celery：story 变更后重组关联章节的 canonical_markdown（物化视图）。"""

from celery import shared_task
from sqlalchemy import select

from app.core.db import get_sync_db
from app.core.logging import get_logger
from app.features.memoir import repo as memoir_repo
from app.features.memoir.models import Chapter, ChapterStoryLink

logger = get_logger(__name__)


@shared_task(bind=True, max_retries=3, default_retry_delay=30)
def recompose_chapters_for_story(self, story_id: str) -> dict:
    try:
        with get_sync_db() as session:
            stmt = (
                select(Chapter.id)
                .join(
                    ChapterStoryLink,
                    ChapterStoryLink.chapter_id == Chapter.id,
                )
                .where(
                    ChapterStoryLink.story_id == story_id,
                    Chapter.markdown_compose_dirty.is_(True),
                )
            )
            ids = list(session.scalars(stmt).all())
            for cid in ids:
                memoir_repo.compose_chapter_from_story_links_sync(session, cid)
            session.commit()
        logger.info(
            "recompose_chapters_for_story: story={} recomposed_chapters={}",
            story_id,
            ids,
        )
        return {"story_id": story_id, "recomposed_chapter_ids": ids}
    except Exception as exc:
        logger.warning(
            "recompose_chapters_for_story failed story={} err={}", story_id, exc
        )
        raise self.retry(exc=exc) from exc