from dotenv import load_dotenv
from os import environ
from tweepy import OAuthHandler, API, StreamListener, Stream
from re import sub
from random import choice
from datetime import datetime
from pytz import timezone
from queue import Queue

def load(variables) -> dict:
    """Load environment variables."""
    keys = {}
    load_dotenv() # load .env file
    for var in variables:
        try:
            res = environ[var]
            if var == "PSEUDOS":
                res = list(set(res.split(',')) - {""}) # create a list for the channels and remove blank channels and doubles
            keys[var] = res
        except KeyError:
            print(f"Veuillez définir la variable d'environnement {var} (fichier .env supporté)")
            exit(1)
    return keys

class Listener(StreamListener):
    def __init__(self, api = None, users = None, q = Queue()):
        super(Listener, self).__init__()
        self.q = q
        self.api = api
        self.listOfFriendsID = getFriendsID(api, users)

    def on_status(self, status):
        """Answer to tweets."""
        if status._json["user"]["id"] in self.listOfFriendsID: # verification of the author of the tweet
            if seniority(status._json["created_at"]): # verification of the age of the tweet
                # recovery of the last "usable" word of the tweet
                regex = r"https?:\/\/\S+| +?\?|\?| +?\!| ?\!|-|~|(?<=ui)i+|@\S+|\.+|(?<=na)a+(?<!n)|(?<=quoi)i+|(?<=no)o+(?<!n)|…"
                tweetText = sub(regex, "", status._json["text"].lower())
                lastWord = tweetText.split()[-1:][0]
                print(f"Tweet trouvé (dernier mot: \"{lastWord}\")...", end = " ")
                if lastWord in universalBase: # check if the last word found is a supported word
                    answer = None
                    for mot in base.items():
                        if lastWord in mot[1]:
                            answer = answers[mot[0]]
                    if answer == None:
                        print(f"{errorMessage} Aucune réponse trouvée.")
                    else:
                        print(f"Envoie d'un {answer[0]}...", end = " ")
                        try: # send answer
                            self.api.update_status(status = choice(answer), in_reply_to_status_id = status._json["id"], auto_populate_reply_metadata = True)
                            print(f"{status._json['user']['screen_name']} s'est fait {answer[0]} !")
                        except Exception as error:
                            print(f"\n{errorMessage} {error}")
                else:
                    print("Annulation parce que le dernier mot n'est pas intéressant.")

    def do_stuff(self):
        while True:
            self.q.get()
            self.q.task_done()

def getFriendsID(api, users: list) -> list:
    """Get all friends of choosen users."""
    liste = []
    for user in users:
        liste.extend(api.friends_ids(user))
    return list(set(liste))

def seniority(date: str) -> bool:
    """Return True only if the given string date is less than one day old."""
    datetimeObject = datetime.strptime(date, '%a %b %d %H:%M:%S +0000 %Y') # Convert String format to datetime format
    datetimeObject = datetimeObject.replace(tzinfo = timezone('UTC')) # Twitter give us an UTC time
    age = datetime.now(timezone('UTC')) - datetimeObject # Time now in UTC minus the time we got to get the age of the date
    return False if age.days >= 1 else True # False if older than a day

def permute(array: list) -> list:
    """Retrieves all possible combinations for the given list and returns the result as a list."""
    quoiListe = []

    for text in array: # all element of the list
        n = len(text)
        mx = 1 << n # Number of permutations is 2^n
        text = text.lower() # Converting string to lower case

        for i in range(mx): # Using all subsequences and permuting them
            combination = [k for k in text]
            for j in range(n):
                if (((i >> j) & 1) == 1): # If j-th bit is set, we convert it to upper case
                    combination[j] = text[j].upper()

            temp = ""
            for i in combination:
                temp += i
            quoiListe.append(temp)
    return quoiListe

def createBaseTrigger(lists) -> list:
    """Merges all given lists into one."""
    listing = []
    for liste in lists:
        listing.extend(liste)
    return list(set(listing))

def createBaseAnswers(word) -> list:
    """Generates default answers for a given word."""
    return [word, f"({word})", word.upper(), f"{word} lol"]

def main(accessToken: str, accessTokenSecret: str, consumerKey: str, consumerSecret: str, users: list):
    """Main method."""
    auth = OAuthHandler(consumerKey, consumerSecret)
    auth.set_access_token(accessToken, accessTokenSecret)
    
    api = API(auth_handler = auth, wait_on_rate_limit = True)

    listener = Listener(api, users)
    stream = Stream(auth = api.auth, listener = listener)

    print(f"Scroll sur Twitter avec les abonnements de @{', @'.join(users)}...")
    stream.filter(track = triggerWords, languages = ["fr"], stall_warnings = True, is_async = True)

if __name__ == '__main__':
    """
    TOKEN is the Access Token available in the Authentication Tokens section under Access Token and Secret sub-heading.
    TOKEN_SECRET is the Access Token Secret available in the Authentication Tokens section under Access Token and Secret sub-heading.
    CONSUMER_KEY is the API Key available in the Consumer Keys section.
    CONSUMER_SECRET is the API Secret Key available in the Consumer Keys section.
    --
    PSEUDO is the PSEUDO of the account you want to listen to snipe.
    """
    errorMessage = "Une erreur survient !" # error message

    # words to detect
    base = {
        "quoi": ["quoi", "koi", "quoient", "q u o i"],
        "oui": ["oui", "ui"],
        "non": ["non", "nn"],
        "nan": ["nan"]
    }
    universalBase = createBaseTrigger(list(base.values()))

    # creation of the list with all alternatives (upper/lower case)
    triggerWords = permute(universalBase)

    # creation of answers
    answers = {
        "quoi": createBaseAnswers("feur") + [
            "https://twitter.com/shukuzi62/status/1422611919538724868/video/1",
            "feur (-isson)",
            "https://twitter.com/antoinelae/status/1422943594403581957/video/1"
        ],
        "oui": createBaseAnswers("stiti"),
        "non": createBaseAnswers("bril"),
        "nan": createBaseAnswers("cy")
    }
    
    # loading environment variables and launching the bot
    keys = load(["TOKEN", "TOKEN_SECRET", "CONSUMER_KEY", "CONSUMER_SECRET", "PSEUDOS"])
    main(keys["TOKEN"], keys["TOKEN_SECRET"], keys["CONSUMER_KEY"], keys["CONSUMER_SECRET"], keys["PSEUDOS"])