def binary_to_ascii(binary_message):
    ascii_list = list()
    for byte in binary_message:
        byte = byte[::-1]
        acc = 0
        for i in range(len(byte)):
            acc += int(byte[i])*(2**i)
        ascii_list.append(acc)
    return ascii_list

def caesar(ascii_list, key):
    s = ""
    for e in ascii_list:
        key = int(key)
        val = (e - key)
        if val < 0:
            val = 100 + ((e - key) % 26)
            if val > ord("z"):
                val -= 26
        s = s + chr(val)
    return s


def decrypt(encrypt_text, s):
    decrypted_text = ''
    for i in range(len(encrypt_text)):
        if encrypt_text[i] == ' ':
            decrypted_text = decrypted_text + encrypt_text[i]
        elif encrypt_text[i].isupper():
            decrypted_text = decrypted_text + chr((ord(encrypt_text[i])-s-65)%26+65)
        else:
            decrypted_text = decrypted_text + chr((ord(encrypt_text[i])-s-97)%26+97)
    return decrypted_text

def start(file_name):
    lines = open(file_name).read().splitlines()
    for line in lines:
        element_list = line.split(":")
        algorithm = element_list[0]
        key = element_list[1]
        message = element_list[2]
        letter_list = message.split(" ")
        ascii_list = binary_to_ascii(letter_list)
        print(ascii_list)
        if algorithm == "caesar":
            print(caesar(ascii_list, int(key)))
        else:
            print("implementa funzione")


start("caesartwo.txt")