"""AI数字人渲染 Celery 异步任务 — #1798."""

from __future__ import annotations

import logging

from app.core.celery_app import celery_app
from app.dependencies import get_db_session

logger = logging.getLogger(__name__)


@celery_app.task(bind=True, name="ai_avatar_render.execute", max_retries=2)
def execute_ai_avatar_render(self, job_id: str) -> dict:
    """执行 AI 数字人渲染管线.

    进度更新:
    - 0%: 任务开始
    - 20%: 下载对口型视频完成
    - 40%: 滤镜链构建完成
    - 80%: FFmpeg 渲染完成
    - 95%: 上传 OSS 完成
    - 100%: 任务完成
    """
    logger.info("开始执行渲染任务: %s", job_id)
    self.update_state(state="PROCESSING", meta={"progress": 0, "job_id": job_id})

    try:
        # 获取数据库 session
        db_gen = get_db_session()
        db = next(db_gen)
        try:
            from app.services.ai_avatar_render_service import AiAvatarRenderService

            service = AiAvatarRenderService(db)
            service.execute_render(job_id)
        finally:
            try:
                next(db_gen)
            except StopIteration:
                pass

        return {"status": "completed", "job_id": job_id}

    except Exception as exc:
        logger.exception("渲染任务执行异常 [%s]: %s", job_id, exc)
        self.update_state(state="FAILED", meta={"progress": 0, "error": str(exc)})
        raise