"""Utils functions related to dates manipulations."""

import datetime


def get_last_monday():
    """Get the datetime of the last monday at midnight.

    Args:
        None

    Returns:
        datetime.datetime: the datetime of the last monday at midnight
    """
    today = datetime.date.today()
    monday = today - datetime.timedelta(days=today.weekday())
    midnight = datetime.time()
    return datetime.datetime.combine(monday, midnight)


def get_friday_of_last_week():
    """Get the datetime of the last friday at midnight.

    Args:
        None

    Returns:
        datetime.datetime: the datetime of the last friday
    """
    today = datetime.date.today()
    last_friday = (
        today - datetime.timedelta(days=today.weekday(), weeks=1) + datetime.timedelta(days=4)
    )
    midnight = datetime.time()
    return datetime.datetime.combine(last_friday, midnight)


def get_friday_of_two_weeks_ago():
    """Get the datetime of the friday before the last friday at midnight.

    Args:
        None

    Returns:
        datetime.datetime: the datetime of the friday before last
    """
    return get_friday_of_last_week() - datetime.timedelta(weeks=1)


def get_last_thursday():
    """Get the datetime of the last thursday at midnight.

    Args:
        None

    Returns:
        datetime.datetime: the datetime of the last thursday
    """
    today = datetime.date.today()
    weekday = today.weekday()
    thursday_week_day = 3
    midnight = datetime.time()

    if weekday == thursday_week_day:
        last_thursday = today - datetime.timedelta(weeks=1)
    elif weekday < thursday_week_day:
        last_thursday = (
            today - datetime.timedelta(days=today.weekday(),
                                       weeks=1) + datetime.timedelta(days=thursday_week_day)
        )
    else:
        diff = weekday - thursday_week_day
        last_thursday = today - datetime.timedelta(days=diff)

    return datetime.datetime.combine(last_thursday, midnight)


def get_friday_before_last():
    """Get the datetime of the friday before the last at midnight.

    Args:
        None

    Returns:
        datetime.datetime: the datetime of the friday before the last
    """
    today = datetime.date.today()
    weekday = today.weekday()
    friday_week_day = 4

    if weekday <= friday_week_day:
        return get_friday_of_two_weeks_ago()
    else:
        return get_friday_of_last_week()