from datetime import date


def get_playlists_tracks_trend(
        current_position: int,
        current_highest_position: int,
        previous_position: int
    ) -> int or None:
    """Calculate track is trend in playlist.

    Args:
        current_position (int): Current track position in playlist.
        current_highest_position (int): The highest position for the specific isrc of the specific playlist.
        previous_position (int or None): Previous track position in playlist.

    Returns:
        Int or None
    """
    if current_position != current_highest_position or previous_position is None:
        return
    return current_highest_position - previous_position


def is_track_new_entry(
        current_position: int,
        current_highest_position: int,
        earliest_added_date: date,
        current_date: date or None = None
    ) -> bool:
    """Calculate if track is new in playlist.

    Args:
        current_position (int): Current track position in playlist.
        current_highest_position (int): The highest position for the specific isrc of the specific playlist.
        earliest_added_date (date): Earliest date of track in playlist.
        current_date (date or None): Current date.

    Returns:
        Boolean
    """
    current_date = current_date or date.today()
    return current_position == current_highest_position and current_date == earliest_added_date