import os
import redis
import logging

logger = logging.getLogger(__name__)

def get_redis_client():
    redis_url = os.getenv("REDIS_URL", "redis://localhost:6379/0")
    
    # Handle TLS for Upstash Redis
    _is_tls = redis_url.startswith("rediss://")
    if _is_tls:
        # Normalize ssl_cert_reqs to 'none' if it is 'CERT_NONE' (case-insensitive) to prevent redis-py errors
        if "ssl_cert_reqs=" in redis_url:
            redis_url = redis_url.replace("ssl_cert_reqs=CERT_NONE", "ssl_cert_reqs=none")
            redis_url = redis_url.replace("ssl_cert_reqs=cert_none", "ssl_cert_reqs=none")
        else:
            if "?" in redis_url:
                redis_url += "&ssl_cert_reqs=none"
            else:
                redis_url += "?ssl_cert_reqs=none"
            
    try:
        # If it's rediss://, redis.from_url handles ssl parameters
        client = redis.Redis.from_url(redis_url, decode_responses=True)
        return client
    except Exception as e:
        logger.error(f"Error creating Redis client: {e}")
        return None