import string
import codecs
from text_codecs.register import register_codec
from easybits import Bits

vowels = 'aeiouyAEIOUY'
allowed_chars = string.ascii_letters + string.digits

def encode(text):
    
    ascii_chars = []
    last_character_was_space = False
    for char in text:
        if char in allowed_chars:
            ascii_chars.append(char)
            last_character_was_space = False
        elif char in string.whitespace and not last_character_was_space:
            ascii_chars.append(' ')
            last_character_was_space = True
    ascii_text = ''.join(ascii_chars)

    no_vowels = []
    for ch in ascii_text:
        if ch not in vowels:
            no_vowels.append(ch)
    
    return Bits(no_vowels, encoding = 'ascii7')


def decode(data):
    bits = Bits(bytes(data))
    text = ""
    for i in range(0, len(bits), 7):
        byte = Bits('0').concat(bits[i:i+7])
        text += Bits(byte).ascii
    return text


register_codec(encode, decode, "noVow7")