from datetime import date
from typing import Optional


def get_track_in_playlist_trend(
    current_position: int, previous_position: Optional[int], current_highest_position: int = None, none_as=None
) -> Optional[int]:
    """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.
        none_as (Any): value to mark None trend as, None - by default.
    Returns:
        Int or None
    """
    if (
        current_highest_position is not None
        and current_position != current_highest_position
        or previous_position is None
    ):
        return none_as
    return current_position - previous_position


def is_track_in_playlist_new_entry(
    earliest_added_date: date,
    current_date: date = None,
    current_position: int = None,
    current_highest_position: int = None,
) -> bool:
    """Calculate if track is new in playlist.
    Args:
        current_position (int): Current track position in playlist.
        current_date (date): Date considered as current, "today" by default.
        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.
    Returns:
        Boolean
    """
    current_date = current_date or date.today()
    return (
        current_highest_position is None or current_position is None or current_position == current_highest_position
    ) and current_date == earliest_added_date