hardnested_sums = [0, 32, 56, 64, 80, 96, 104, 112, 120, 128, 136, 144, 152, 160, 176, 192, 200, 224, 256]
hardnested_nonces_sum_map = []
hardnested_first_byte_num = 0
hardnested_first_byte_sum = 0


def evenparity32(n):
    """
    calc evenparity32, can replace to any fast native impl...
    @param n - NT_ENC
    """
    ret = 0
    for i in range(32):
        if (n & (1 << i)) != 0:
            ret += 1
    return ret % 2


def check_nonce_unique_sum(nt, par):
    """
    Check nt_enc is unique and calc first byte sum
    Pay attention: thread unsafe!!!
    @param nt - NT_ENC
    @param par - parity of NT_ENC
    """
    global hardnested_first_byte_sum, hardnested_first_byte_num
    first_byte = nt >> 24
    if not hardnested_nonces_sum_map[first_byte]:
        hardnested_first_byte_sum += evenparity32((nt & 0xff000000) | (par & 0x08))
        hardnested_nonces_sum_map[first_byte] = True
        hardnested_first_byte_num += 1


def reset():
    global hardnested_first_byte_sum, hardnested_first_byte_num, hardnested_nonces_sum_map
    # clear the history
    hardnested_nonces_sum_map = list()
    for i in range(256):
        hardnested_nonces_sum_map.append(False)
    hardnested_first_byte_sum = 0
    hardnested_first_byte_num = 0