from typing import Optional


def format_image_url_with_size(url_mask: str, image_size: int) -> Optional[str]:
    """Format image url mask of track/playlist with particular size."""
    return url_mask and url_mask.format(w=image_size, h=image_size)


def get_image_url(data: dict, image_size: int = None) -> Optional[str]:
    """Get image url from track/playlist data for particular size if specified.

    :param data: track/playlist data dictionary
    :param image_size: desirable image size

    :return: image url mask to substitute particular size or common.
    """
    url_mask = data.get("attributes", {}).get("artwork", {}).get("url")
    if image_size:
        return format_image_url_with_size(url_mask, image_size)
    return url_mask


def get_isrc(data: dict) -> str:
    """Get isrc from apple playlist/track data."""
    return data.get("attributes", {}).get("isrc")