def main():
    random.seed(125)
    #Get the file to encrypt
    file = input('Enter a name of a text file to mix: ')
    print()
    #open the file that will be encrypted
    log = open(file, 'r')
    #open the index file that keeps track of how the encryption works
    index_file = open('index.txt', 'w')
    #open the file where the encrypted text will be placed
    encrypted_file = open('encrypted.txt', 'w')
    contents = []
    encrypted_contents = []
    for i in log:
        contents.append(i)
    indexs = []
    for i in range(1, len(contents) + 1):
        indexs.append(i)
    for i in indexs * 5: #randomize the index
        randomize(indexs)
    for i in indexs:
        encrypted_contents.append(contents[i - 1])
    for i in range(len(indexs)): #write into the encrypted file and the index file
        encrypted_file.write(encrypted_contents[i])
        index_file.write(str(indexs[i]) + '\n')
    index_file.close()
    encrypted_file.close() #Always close opened files.
    log.close()

def randomize(indexs): #This function randomizes the order to encrypt the code.
    random_number_one = random.randint(0, len(indexs) - 1)
    random_number_two = random.randint(0, len(indexs) - 1)
    value_one = indexs[random_number_one]
    value_two = indexs[random_number_two]
    indexs[random_number_one] = value_two
    indexs[random_number_two] = value_one

main()