"""Failed download logging."""

import logging
from datetime import datetime

from image_resizer.config import FAILED_LOG_PATH

logger = logging.getLogger(__name__)


def log_failure(url: str, reason: str) -> None:
  """Append a failed download entry to the log file."""
  timestamp = datetime.now().isoformat(timespec="seconds")
  line = f"{timestamp}\t{url}\t{reason}\n"
  try:
    with open(FAILED_LOG_PATH, "a", encoding="utf-8") as f:
      f.write(line)
  except OSError as e:
    logger.error("Could not write to %s: %s", FAILED_LOG_PATH, e)