"""Caesar cipher solver"""

# variables go here
alphabet = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
letter_list = []
user_input = ""

# functions here

def encode(increment_repeat=0):
    """Encodes strings."""
    for x in range(0, letter_amount):
        if (input_string[0 + increment_repeat]) == " ":
            increment_repeat += 1
            letter_list.append(" ")
        elif (input_string[0 + increment_repeat]).isnumeric():
            increment_repeat += 1
            letter_list.append(input_string[-1 + increment_repeat])
        else:
            letter = ord(input_string[0 + increment_repeat])
            increment_repeat += 1
            letter_list.append(alphabet[(letter - 97) + key])

def decode(increment_repeat=0):
    """Decodes strings."""
    for x in range(0, letter_amount):
        if (input_string[0 + increment_repeat]) == " ":
            increment_repeat += 1
            letter_list.append(" ")
        elif (input_string[0 + increment_repeat]).isnumeric():
            increment_repeat += 1
            letter_list.append(input_string[-1 + increment_repeat])
        else:
            letter = ord(input_string[0 + increment_repeat])
            increment_repeat += 1
            letter_list.append(alphabet[(letter - 97) - key])

def crack(increment_repeat=0, crack_list=None):
    """Automatically prints every possible string."""
    if crack_list is None:
        crack_list = []

    for crack_phase in range(0, 26):
        for x in range(0, letter_amount):
            if (input_string[0 + increment_repeat]) == " ":
                increment_repeat += 1
                crack_list.append(" ")
            elif (input_string[0 + increment_repeat]).isnumeric():
                increment_repeat += 1
                crack_list.append(input_string[-1 + increment_repeat])
            else:
                letter = ord(input_string[0 + increment_repeat])
                increment_repeat += 1
                crack_list.append(alphabet[(letter - 97) + crack_phase])

        crack_string = ''.join(crack_list)
        print(crack_string)

        crack_phase += 1
        increment_repeat = 0
        crack_list = []

    print()
    print("Every possible string has been printed.")
    print("Check all of the strings and see if any of them reveal a message.")
    print("If not, then the original string was probably not encrypted using Caesar Cipher.")

input_string = input("string? ")
letter_amount = len(input_string)
input_string.lower()


while True:
    user_input = input("decode, encode or crack? ")

    if user_input == "decode" or user_input == "encode" or user_input == "crack":
        break

    else:
        print("Please choose an option")

if user_input == "encode" or user_input == "decode":
    while True:
        key = int(input("key? "))

        if 27 > key > -27:
            break

        else:
            print("key must be below 27 and above -27")

while True:
    if user_input == "decode":
        decode()
        break

    elif user_input == "encode":
        encode()
        break

    elif user_input == "crack":
        crack()
        break

printable_string = ''.join(letter_list)
print(printable_string)