a

import praw
import requests
import bs4
import time

reddit = praw.Reddit(client_id = '*********',
                    client_secret = '*******************',
                    username = 'IsLinkDownBot',
                    password = '********',
                    user_agent = 'IsLinkDown v1.0')


def is_link_down(link):
    """
    Checks downforeveryoneorjustme.com to find out if the link is down or not.
    If an error occurs, waits for 30 minutes and tries again.
    """
    try:
        link = link.lower()
        url = "http://www.downforeveryoneorjustme.com/{}".format(link)
        response = requests.get(url)
        soup = bs4.BeautifulSoup(response.text, 'html.parser')
        for p_tag in soup.find_all('p'):
            result = str(p_tag.contents[0]).strip()
            if result == "It's just you.":
                result += link + " is up for everybody else."
            elif result == "It's not just you!":
                result += link + " is down for everybody else."
            break
        return result
    except:
        time.sleep(1800)
        is_link_down(link)



while True:
    """
    Checks every 30 minutes for new mentions of /u/IsLinkDownBot by any Redditor.
    If it has been mentioned, replies with the message.
    """
    for mention in reddit.inbox.mentions():
        with open("mentions_replied_to.txt", "r") as f:
            mentions_replied_to = f.read()
            mentions_replied_to = mentions_replied_to.split("\n")
            mentions_replied_to = list(filter(None, mentions_replied_to))

            if mention not in mentions_replied_to:
                #mention body = '/u/IsLinkDownBot google.com'
                link = str(mention.body).replace('/u/IsLinkDownBot','') #' google.com'
                link = link.strip() #'google.com'

                message = is_link_down(link)
                mention.reply(message)
                #Adding mention ID to the list.
                mentions_replied_to.append(mention)

        with open("mentions_replied_to.txt", "w") as f:
            for mentionid in mentions_replied_to:
                f.write(str(mentionid) + "\n")
            f.close()
        time.sleep(1800)