"""
utils.py – Common helpers for CoinDesk API client.

- Parsing and formatting helpers (e.g., date conversion)
- Logging setup
- Retry/backoff utilities (for transient errors)
"""

import logging
from datetime import datetime
import time

def parse_date(date_str):
    return datetime.fromisoformat(date_str)

def setup_logger(name):
    logger = logging.getLogger(name)
    if not logger.handlers:
        handler = logging.StreamHandler()
        formatter = logging.Formatter('[%(asctime)s] %(levelname)s %(name)s: %(message)s')
        handler.setFormatter(formatter)
        logger.addHandler(handler)
    logger.setLevel(logging.INFO)
    return logger

def retry(func, retries=3, delay=2):
    for attempt in range(retries):
        try:
            return func()
        except Exception as e:
            if attempt == retries - 1:
                raise
            time.sleep(delay)