import time
import requests
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
from config.settings import MODEL_RETRY_ATTEMPTS, REQUEST_RETRY_ATTEMPTS, BACKOFF_FACTOR
from utils.logger import setup_logger

logger = setup_logger(__name__)

class ModelLoader:
    @staticmethod
    def create_retry_session():
        session = requests.Session()
        retry = Retry(
            total=REQUEST_RETRY_ATTEMPTS,
            backoff_factor=BACKOFF_FACTOR,
            status_forcelist=[500, 502, 503, 504]
        )
        adapter = HTTPAdapter(max_retries=retry)
        session.mount('http://', adapter)
        session.mount('https://', adapter)
        return session

    @staticmethod
    def load_model_with_retry(model_name, model_class, **kwargs):
        for attempt in range(MODEL_RETRY_ATTEMPTS):
            try:
                logger.info(f"Loading model {model_name} (attempt {attempt + 1}/{MODEL_RETRY_ATTEMPTS})")
                return model_class.from_pretrained(model_name, **kwargs)
            except Exception as e:
                if attempt == MODEL_RETRY_ATTEMPTS - 1:
                    logger.error(f"Failed to load model {model_name}: {str(e)}")
                    raise
                logger.warning(f"Attempt {attempt + 1} failed, retrying...")
                time.sleep(2 ** attempt)