import praw
import re
import time


def login(password):
    reddit = praw.Reddit(
        username='MyRSSBot',
        password=password,
        client_id='qTnjdOyhvYjzWw',
        client_secret='t7pZnB4QboZ9r1x09-QEUO5NHdI',
        user_agent='MyRSSBot v2 - adding neutral politics to the sub.')
    return reddit

def write_to_file(username, file='users.txt'):
    with open(file,'a') as f:
        f.write(username+'\n')
        f.close()

def check_file_for_username(username,file='users.txt'):
    with open(file,'r') as f:
        if username in f.read().split('\n'):
            return True
        else:
            return False

def add_users_from_target(target_subreddit,home_subreddit,password):
    target_sub = re.sub('\/?[rR]\/','',target_subreddit)
    home_sub = re.sub('\/?[rR]\/','',home_subreddit)
    reddit = login(password)
    target_subreddit = reddit.subreddit(target_sub)
    home_subreddit = reddit.subreddit(home_sub)
    for comment in target_subreddit.stream.comments():
        try:
            if not check_file_for_username(comment.author.name):
                write_to_file(comment.author.name)
                home_subreddit.contributor.add(comment.author.name)
            else:
                pass
        except Exception as e:
            print(e)

def countdown(integer):
    print("Starting in {}".format(integer+1))
    interval = list(reversed([i for i in range(integer) if i != 0]))
    for n in interval:
        print(n)
        time.sleep(1)

def main():
    password=input('Please input password for MyRSSBot: ')
    verify_password=input('Please verify the password above: ')
    if password != verify_password:
        print("Passwords do not match, please try again.")
        time.sleep(3)
        main()
    target = input('Please enter the subreddit you would like to add users from: ')
    home = input("Please enter the subreddit you would like to add them to: ")
    countdown(10)
    add_users_from_target(target,home,password)

if __name__ == '__main__':
    main()