def bucket_suffix(contrib):
    c = contrib or 0
    if c <= 3:
        return '3'
    elif c <= 6:
        return '6'
    elif c <= 9:
        return '9'
    elif c <= 12:
        return '12'
    elif c <= 15:
        return '15'
    elif c <= 18:
        return '18'
    elif c <= 21:
        return '21'
    elif c <= 24:
        return '24'
    elif c <= 27:
        return '27'
    else:
        return '30'


def display_to_actual_round(display_round, gen, Round_FirstTask, Round_Per_Gen):
    if gen == 1:
        return display_round + Round_FirstTask - 1
    elif gen == 2:
        return display_round + Round_FirstTask + Round_Per_Gen - 1
    elif gen == 3:
        return display_round + Round_FirstTask + 2 * Round_Per_Gen - 1
    return display_round


def chat_nickname(player):
    roman_numerals = {1: 'I', 2: 'II', 3: 'III'}
    generation = player.participant.vars.get('Ana_generation')
    generation_str = roman_numerals.get(generation, str(generation))
    fam = player.participant.vars.get('Ana_family_assignment')
    if not fam or fam == 'XX':
        return f"Player-{generation_str}"
    return f"{fam}-{generation_str}"