"""Client Redis asincrono (redis-py asyncio). Singleton semplice."""
from __future__ import annotations

from typing import Optional

import redis.asyncio as redis

from core.config import settings

_client: Optional[redis.Redis] = None


def client() -> redis.Redis:
    global _client
    if _client is None:
        _client = redis.Redis(
            host=settings.redis_host,
            port=settings.redis_port,
            decode_responses=True,
            health_check_interval=30,
        )
    return _client


async def close() -> None:
    global _client
    if _client is not None:
        await _client.aclose()
        _client = None