"""Async lifespan helper to initialize an asyncio Redis client and attach to app.state.redis.
This separates the async redis client lifecycle from synchronous redis_client/redis_manager modules.
"""
import os
from contextlib import asynccontextmanager

import redis.asyncio as aioredis
import redis as redis_sync
from fastapi import FastAPI
import logging

logger = logging.getLogger("app.redis")


@asynccontextmanager
async def lifespan(app: FastAPI):
    redis_url = os.getenv("REDIS_URL")
    redis_host = os.getenv("REDIS_HOST", "127.0.0.1")
    redis_port = int(os.getenv("REDIS_PORT", "6379"))
    redis_db = int(os.getenv("REDIS_DB", "0"))
    redis_password = os.getenv("REDIS_PASSWORD", None)

    if redis_url:
        async_client = aioredis.from_url(redis_url, decode_responses=True)
        sync_client = redis_sync.from_url(redis_url, decode_responses=True)
    else:
        client = redis.Redis(host=redis_host, port=redis_port, db=redis_db, password=redis_password, decode_responses=True)

    try:
        # Verify connectivity for both clients
        await async_client.ping()
        try:
            sync_client.ping()
        except Exception:
            logger.warning("Sync Redis ping failed during startup", exc_info=True)

        app.state.redis = async_client
        app.state.redis_sync = sync_client
        logger.info("Redis clients initialized and attached to app.state.redis (async) and app.state.redis_sync (sync) (host=%s port=%s db=%s)", redis_host, redis_port, redis_db)
    except Exception as e:
        logger.error("Failed to initialize Redis clients: %s", e, exc_info=True)
        app.state.redis = None
        app.state.redis_sync = None

    try:
        yield
    finally:
        try:
                if getattr(app.state, "redis", None) is not None:
                    await app.state.redis.close()
                    logger.info("Async Redis client closed on shutdown")
            except Exception:
                logger.error("Error closing async Redis client", exc_info=True)

            # Close sync client
            try:
                if getattr(app.state, "redis_sync", None) is not None:
                    try:
                        app.state.redis_sync.close()
                    except Exception:
                        try:
                            app.state.redis_sync.connection_pool.disconnect()
                        except Exception:
                            pass
                    logger.info("Sync Redis client closed on shutdown")
            except Exception:
                logger.error("Error closing sync Redis client", exc_info=True)