# --- Library Imports ---
from fastapi import Depends
from redis import BlockingConnectionPool, Redis
# ---

# --- User Imports ---
from ..app_logger.logger import logger
from ...config.env import env
# ---

# --- Constants ---
# Create a global variable to store the connection pool (initially None)
REDIS_POOL = None
# ---


async def get_redis_client():
    """
    This function initializes the Redis connection pool on the first call
    and retrieves/releases connections for dependency injection.
    """
    global REDIS_POOL
    if REDIS_POOL is None:
        # Configure connection details and pool size as needed
        REDIS_POOL = BlockingConnectionPool(timeout=5).from_url(
            f"redis://{env.REDIS_USERNAME}:{env.REDIS_PASSWORD}@{env.REDIS_HOST}:{env.REDIS_PORT}/{env.REDIS_DB}")

    connection = REDIS_POOL.get_connection(command_name="")
    client = Redis(connection_pool=REDIS_POOL)
    try:
        yield client
    finally:
        REDIS_POOL.release(connection)


# Export the dependency function for use in API endpoints
redis = Depends(get_redis_client)
logger.debug("Initialized Redis connection pool")