#utils/helpers.py
from datetime import datetime
import logging
import os
import time
from functools import wraps
# --------------------
# Ensure folder exists
# --------------------
def ensure_folder(path):
    if not os.path.exists(path):
        os.makedirs(path)

# --------------------
# Logger setup
# --------------------
def setup_logger(log_file: str = None):
    logger = logging.getLogger("reddit_logger")
    logger.setLevel(logging.INFO)

    if not logger.handlers:
        # Console handler
        ch = logging.StreamHandler()
        ch.setLevel(logging.INFO)
        formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
        ch.setFormatter(formatter)
        logger.addHandler(ch)

        # File handler (optional)
        if log_file:
            ensure_folder(os.path.dirname(log_file))
            fh = logging.FileHandler(log_file)
            fh.setLevel(logging.INFO)
            fh.setFormatter(formatter)
            logger.addHandler(fh)

    return logger

# Initialize logger (console + optional file)
logger = setup_logger("logs/reddit_scraper.log")

# --------------------
# Convert timestamp to datetime
# --------------------
def timestamp_to_datetime(ts):
    return datetime.utcfromtimestamp(ts)

# --------------------
# Retry decorator for API calls
# --------------------
def retry(exceptions, tries=3, delay=2, backoff=2, logger=None):
    """
    Retry decorator for functions that may fail due to network/API issues.
    exceptions: tuple of exception types to catch
    tries: number of attempts
    delay: initial delay between retries
    backoff: multiplier for delay after each failure
    """
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            _tries, _delay = tries, delay
            while _tries > 0:
                try:
                    return func(*args, **kwargs)
                except exceptions as e:
                    msg = f"{func.__name__} failed with {e}, retrying in {_delay} seconds..."
                    if logger:
                        logger.warning(msg)
                    else:
                        print(msg)
                    time.sleep(_delay)
                    _tries -= 1
                    _delay *= backoff
            msg = f"{func.__name__} failed after {tries} attempts."
            if logger:
                logger.error(msg)
            else:
                print(msg)
            raise
        return wrapper
    return decorator