import asyncio
from typing import List, Optional, Callable
from mq_http_sdk.mq_client import MQClient
from mq_http_sdk.mq_exception import MQExceptionBase
from mq_http_sdk.mq_consumer import Message

from config import settings


class AsyncRocketMQConsumer:
    """
    阿里云 RocketMQ HTTP 协议异步消费者封装类
    - 支持自动读取环境变量
    - 基于 asyncio 实现原生异步消费模型
    - 手动确认消费
    """

    def __init__(
        self,
        topic_name: Optional[str],
        group_id: Optional[str],
        wait_seconds: Optional[int] = None,
        batch: Optional[int] = None,
    ):
        # 从环境变量读取配置
        self.endpoint = settings.ROCKETMQ_ENDPOINT
        self.access_key_id = settings.ROCKETMQ_ACCESS_KEY_ID
        self.access_key_secret = settings.ROCKETMQ_ACCESS_KEY_SECRET
        self.instance_id = settings.ROCKETMQ_INSTANCE_ID
        self.wait_seconds = settings.ROCKETMQ_WAIT_SECONDS
        self.batch = batch or settings.ROCKETMQ_BATCH
        self.topic_name = topic_name
        self.group_id = group_id
        # 初始化客户端
        self.client = MQClient(self.endpoint, self.access_key_id, self.access_key_secret)
        self.consumer = self.client.get_consumer(self.instance_id, self.topic_name, self.group_id)

    async def receive_messages(self) -> List[Message]:
        """异步封装消息拉取"""
        try:
            return await asyncio.to_thread(
                self.consumer.consume_message,
                self.batch,
                self.wait_seconds,
            )
        except MQExceptionBase as e:
            if getattr(e, "type", "") == "MessageNotExist":
                return []
            raise e

    async def ack_message(self, receipt_handle: str) -> None:
        """确认消费成功"""
        try:
            await asyncio.to_thread(self.consumer.ack_message, [receipt_handle])
        except Exception as e:
            raise RuntimeError(f"确认消息失败: {e}")

    async def run_forever(self, handler: Callable[[Message], asyncio.Future]):
        """
        无限循环拉取消息并处理，适合开发调试或小批量任务

        :param handler: 异步消息处理函数 async def handler(msg: Message)
        """
        print(f"[AsyncRocketMQConsumer] 启动消费: Topic={self.topic_name}, Group={self.group_id}")
        while True:
            try:
                messages = await self.receive_messages()
                for msg in messages:
                    try:
                        await handler(msg)
                        await self.ack_message(msg.receipt_handle)
                    except Exception as e:
                        print(f"[处理失败] {e}\n消息: {msg.message_body}")
            except Exception as e:
                print(f"[拉取失败] {e}")
                await asyncio.sleep(2)