from upstash_redis import Redis as UpstashRedis
from redis import Redis as LocalRedis, RedisError
import vercel_blob
from src.config import REDIS_URL, REDIS_TOKEN, USE_LOCAL_REDIS, LOCAL_REDIS_URL
from fastapi import HTTPException
import logging

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

try:
    if USE_LOCAL_REDIS:
        redis = LocalRedis.from_url(LOCAL_REDIS_URL)
        logger.info("Connecting to local Redis instance...")
    else:
        if not REDIS_URL or not REDIS_TOKEN:
            raise ValueError("Upstash Redis configuration is missing. Please check your environment variables.")
        redis = UpstashRedis(
            url=REDIS_URL,
            token=REDIS_TOKEN
        )
        logger.info("Connecting to Upstash Redis...")

    # Test the connection
    redis.ping()
    logger.info("Successfully connected to Redis")

except ValueError as ve:
    logger.error(f"Configuration error: {str(ve)}")
    raise HTTPException(status_code=500, detail="Database configuration error")
except RedisError as re:
    logger.error(f"Redis connection error: {str(re)}")
    raise HTTPException(status_code=500, detail="Database connection error")
except Exception as e:
    logger.error(f"Unexpected error while connecting to Redis: {str(e)}")
    raise HTTPException(status_code=500, detail="Internal server error")

def get_blob_by_path(folder: str, filename: str) -> dict:
    # Get list of all blobs
    resp = vercel_blob.list()
    
    # Search for matching blob path
    target_path = f"{folder}/{filename}"
    matching_blob = next(
        (blob for blob in resp.get('blobs', []) 
         if blob.get('pathname') == target_path),
        None
    )

    if not matching_blob:
        raise HTTPException(status_code=404, detail="File not found")
        
    return matching_blob