# Functions to make sure the user gives us a valid date.

# Check to make sure year is in the right range.
def validYear(year):
    if year >= 1500 and year <= 2400:
        return True
    else:
        return False

# Check to make sure month is in the right range
def validMonth(month):
    return month >= 1 and month <= 12

# Return True is year is a leap year.
def leapYear(year):
    return False

# Check the validity of the day, given the month and year.
def validDay(month,day,year):
    # Months 4, 6, 9, 11 have 30 days
    # Month 2 has 28 days, except during a leap year, when it has 29.
    # Rest have 31 days.
    return True
    


# Top level function for getting a valid date.
def getValidDate():
    month = int(input("Please enter a valid month (1-12): "))

    day = int(input("Please enter a valid day (1-31): "))

    year = int(input("Please enter a valid year (1500-2400): "))

    # Data validation loops to make sure these values are valid
    # and to fix them if they're not.
    while not validMonth(month):
        print("Month: ", month, " is not between 1 and 12.")
        month = int(input("Please enter a valid month (1-12): "))
    
    while not validYear(year):
        print("Year: ", year, " is not between 1500 and 2400.")
        year = int(input("Please enter a valid year (1500-2400): "))

    while not validDay(month,day,year):
        print("Day is not valid for this month and year.")
        day = int(input("Please enter a valid day (1-31): "))

    return month, day, year