import calendar
from datetime import datetime


def get_reporting_year(date: datetime, reporting_end_month: int) -> int:
    """Calculate reporting year based on the last month of reporting year"""
    if date.month <= reporting_end_month:
        return date.year
    return date.year + 1


def format_reporting_period(year: int, reporting_month: int) -> str:
    """Format the reporting period for a given reporting year"""
    end_date = datetime(
        year, reporting_month, calendar.monthrange(year, reporting_month)[1]
    )

    # If reporting month is December, start date should be January 1st of same year
    # Otherwise, start date is the first day of the next month from previous year
    if reporting_month == 12:
        start_date = datetime(year, 1, 1)
    else:
        start_date = datetime(year - 1, reporting_month + 1, 1)

    return f"{start_date.strftime('%-m/%-d/%y')} - {end_date.strftime('%-m/%-d/%y')}"