from celery import shared_task
from packages.core.logger import app_logger
import time
import os

@shared_task(name="export_data_task")
def export_data_task(query_params: dict, user_email: str):
    """
    异步大结果集导出微服务任务
    """
    app_logger.info(f"Starting async export task for {user_email} with params: {query_params}")
    
    # 模拟长时间运行的导出任务（比如查询 ClickHouse 并写入 Parquet 或 CSV）
    time.sleep(5)
    
    # 假设生成了文件并上传到 S3
    file_url = f"https://s3.example.com/exports/export_{int(time.time())}.csv"
    
    app_logger.info(f"Export task completed. File available at {file_url}")
    
    # 在真实系统中，此时会发送邮件通知用户或通过 WebSocket 推送下载链接
    
    return {
        "status": "success",
        "file_url": file_url,
        "user_email": user_email
    }