# application/functions/async_mysql_service.py
import asyncio
import json
import os
from typing import List, Optional, Dict, Any
from application.base.async_mysql_client import AsyncMySQLClient
from utils.env_loader import load_env


class AsyncMysqlService:
    """
    项目业务逻辑封装类，基于 AsyncMySQLClient 实现异步数据库访问

    功能：
    - 封装与业务相关的 SQL 操作
    - 自动读取环境变量进行配置初始化
    - 与爬虫、任务处理逻辑解耦
    """

    def __init__(self):
        """
        初始化时自动从环境变量读取配置并构造底层连接池客户端
        """
        db_config = {
            "host": os.getenv("DB_HOST"),
            "port": int(os.getenv("DB_PORT")),
            "user": os.getenv("DB_USER"),
            "password": os.getenv("DB_PASSWORD"),
            "db": os.getenv("DB_NAME"),
            "charset": os.getenv("DB_CHARSET")
        }
        self.client = AsyncMySQLClient(**db_config)

    async def init(self):
        """连接池初始化，在服务启动时调用一次"""
        await self.client.init_pool()

    async def get_user_list(self,id) -> List[Dict[str, Any]]:
        sql = "SELECT uid, link, nick_name from crawler_user_v3 where task_id = %s"
        return await self.client.fetch_all(sql, [id])

    async def get_rule_dict(self, rule_id: int) -> Optional[Dict[str, Any]]:
        sql = "SELECT rule FROM crawler_task_v3 WHERE id = %s"
        row = await self.client.fetch_one(sql, [rule_id])
        if not row or "rule" not in row:
            return None

        try:
            # 合并 list[dict] 为一个 dict
            return {k: v for item in json.loads(row["rule"]) for k, v in item.items()}
        except json.JSONDecodeError as e:
            print(f"[get_rule_dict] JSON 解析失败: {e}")
            return None


async def main():
    mysql_service = AsyncMysqlService()
    await mysql_service.init()
    users = await mysql_service.get_user_list(18)
    rules = await mysql_service.get_rule_dict(18)
    print(users)
    await mysql_service.client.close()


if __name__ == '__main__':
    asyncio.run(main())