from typing import Optional
from aioredis import Redis
from api.chat.chat_api import ChatAPI
from .base import ChatQueueBase

class RedisQueue(ChatQueueBase):
    def __init__(self, redis: Redis):
        self.redis = redis
        self.queue_key = "chat_queue"
        
    async def add(self, api_key: str) -> None:
        # 检查 api_key 是否已经在队列中
        exists = await self.redis.lpos(self.queue_key, api_key)
        if exists is None:  # 如果不存在，则添加
            await self.redis.rpush(self.queue_key, api_key)
        
    async def get(self) -> Optional[ChatAPI]:
        api_key = await self.redis.lpop(self.queue_key)
        if api_key:
            # Handle both bytes and str cases
            if isinstance(api_key, bytes):
                api_key = api_key.decode()
            chat = ChatAPI(api_key=api_key)
            # 重新加入队列
            await self.add(api_key)
            return chat
        return None
        
    async def length(self) -> int:
        return await self.redis.llen(self.queue_key)