"""
Date and time utility functions.
"""
from datetime import datetime, timedelta


def get_start_of_week(dt: datetime = None) -> datetime:
    """
    Get the start of the week (Monday) for a given date.

    Args:
        dt: The date to get the start of the week for. Defaults to current date.

    Returns:
        Datetime representing the start of the week
    """
    dt = dt or datetime.now()
    return dt - timedelta(days=dt.weekday())


def get_end_of_week(dt: datetime = None) -> datetime:
    """
    Get the end of the week (Sunday) for a given date.

    Args:
        dt: The date to get the end of the week for. Defaults to current date.

    Returns:
        Datetime representing the end of the week
    """
    dt = dt or datetime.now()
    return get_start_of_week(dt) + timedelta(days=6)


def get_previous_week_range() -> tuple[datetime, datetime]:
    """
    Get the date range for the previous week.

    Returns:
        Tuple of (start_date, end_date) for the previous week
    """
    today = datetime.now()
    # Go back to the previous week
    previous_week = today - timedelta(days=7)
    start_date = get_start_of_week(previous_week)
    end_date = get_end_of_week(previous_week)
    return start_date, end_date