from Database.x_classes import PostRating


def twos_complement(hexstr, bits):
    value = int(hexstr,16) #convert hexadecimal to integer

    #convert from unsigned number to signed number with "bits" bits
    if value & (1 << (bits-1)):
        value -= 1 << bits
    return value

def get_rating_value(rating):
    "for deciding final post rating"
    match rating:
        case PostRating.Explicit:
            return 4
        case PostRating.Questionable:
            return 3
        case PostRating.Sensitive:
            return 2
        case PostRating.General:
            return 1
        case _:
            return 0