from twitter import Twitter, OAuth, TwitterHTTPError, TwitterError
from werkzeug.urls import url_decode
from model import OAuthToken, Account, Post, TwitterArchive
from app import db, app, sentry
from math import inf
from datetime import datetime
import locale
from zipfile import ZipFile
from io import BytesIO
from libforget.exceptions import PermanentError, TemporaryError
from urllib.error import URLError


def get_login_url(callback='oob', consumer_key=None, consumer_secret=None):
    twitter = Twitter(
            auth=OAuth('', '', consumer_key, consumer_secret),
            format='', api_version=None)
    resp = url_decode(twitter.oauth.request_token(oauth_callback=callback))
    oauth_token = resp['oauth_token']
    oauth_token_secret = resp['oauth_token_secret']

    token = OAuthToken(token=oauth_token, token_secret=oauth_token_secret)
    db.session.merge(token)
    db.session.commit()

    return (
        "https://api.twitter.com/oauth/authenticate?oauth_token=%s"
        % (oauth_token,))


def account_from_api_user_object(obj):
    return Account(
            twitter_id=obj['id_str'],
            display_name=obj['name'],
            screen_name=obj['screen_name'],
            avatar_url=obj['profile_image_url_https'],
            reported_post_count=obj['statuses_count'])


def receive_verifier(oauth_token, oauth_verifier,
                     consumer_key=None, consumer_secret=None):
    temp_token = OAuthToken.query.get(oauth_token)
    if not temp_token:
        raise Exception("OAuth token has expired")
    twitter = Twitter(
            auth=OAuth(temp_token.token, temp_token.token_secret,
                       consumer_key, consumer_secret),
            format='', api_version=None)
    resp = url_decode(
            twitter.oauth.access_token(oauth_verifier=oauth_verifier))
    db.session.delete(temp_token)
    new_token = OAuthToken(token=resp['oauth_token'],
                           token_secret=resp['oauth_token_secret'])
    new_token = db.session.merge(new_token)
    new_twitter = Twitter(
            auth=OAuth(new_token.token, new_token.token_secret,
                       consumer_key, consumer_secret))
    remote_acct = new_twitter.account.verify_credentials()
    acct = account_from_api_user_object(remote_acct)
    acct = db.session.merge(acct)

    new_token.account = acct
    db.session.commit()

    return new_token


def get_twitter_for_acc(account):
    consumer_key = app.config['TWITTER_CONSUMER_KEY']
    consumer_secret = app.config['TWITTER_CONSUMER_SECRET']

    tokens = (OAuthToken.query.with_parent(account)
              .order_by(db.desc(OAuthToken.created_at)).all())
    for token in tokens:
        t = Twitter(
                auth=OAuth(token.token, token.token_secret,
                           consumer_key, consumer_secret))
        try:
            t.account.verify_credentials()
            return t
        except TwitterHTTPError as e:
            if e.e.code == 401:
                # token revoked

                if sentry:
                    sentry.captureMessage(
                            'Twitter auth revoked', extra=locals())
                db.session.delete(token)
                db.session.commit()
            else:
                raise TemporaryError(e)
        except URLError as e:
            raise TemporaryError(e)

    raise TemporaryError("No access to account {}".format(account))


locale.setlocale(locale.LC_TIME, 'C')


def post_from_api_tweet_object(tweet, post=None):
    if not post:
        post = Post()
    post.twitter_id = tweet['id_str']
    try:
        post.created_at = datetime.strptime(
                tweet['created_at'], '%a %b %d %H:%M:%S %z %Y')
    except ValueError:
        post.created_at = datetime.strptime(
                tweet['created_at'], '%Y-%m-%d %H:%M:%S %z')
        # whyyy
    post.author_id = 'twitter:{}'.format(tweet['user']['id_str'])
    if 'favorited' in tweet:
        post.favourite = tweet['favorited']
    if 'entities' in tweet:
        post.has_media = bool(
                'media' in tweet['entities'] and tweet['entities']['media'])
    post.is_reblog = 'retweeted_status' in tweet
    return post


def fetch_posts(account, max_id, since_id):
    t = get_twitter_for_acc(account)

    try:
        user = t.account.verify_credentials()
        db.session.merge(account_from_api_user_object(user))

        kwargs = {
                'user_id': account.twitter_id,
                'count': 200,
                'trim_user': True,
                'tweet_mode': 'extended',
                }
        if max_id:
            kwargs['max_id'] = max_id
        if since_id:
            kwargs['since_id'] = since_id

        tweets = t.statuses.user_timeline(**kwargs)
    except (TwitterError, URLError) as e:
        handle_error(e)

    return [post_from_api_tweet_object(tweet) for tweet in tweets]

def refresh_posts(posts):
    if not posts:
        return posts

    t = get_twitter_for_acc(posts[0].author)
    try:
        tweets = t.statuses.lookup(
                    _id=",".join((post.twitter_id for post in posts)),
                    trim_user=True, tweet_mode='extended')
    except (URLError, TwitterError) as e:
        handle_error(e)
    refreshed_posts = list()
    for post in posts:
        tweet = next(
            (tweet for tweet in tweets if tweet['id_str'] == post.twitter_id),
            None)
        if not tweet:
            db.session.delete(post)
        else:
            post = db.session.merge(post_from_api_tweet_object(tweet))
            post.touch()
            refreshed_posts.append(post)

    return refreshed_posts


def delete(post):
    t = get_twitter_for_acc(post.author)
    t.statuses.destroy(id=post.twitter_id)
    db.session.delete(post)


def chunk_twitter_archive(archive_id):
    ta = TwitterArchive.query.get(archive_id)

    with ZipFile(BytesIO(ta.body), 'r') as zipfile:
        files = [filename for filename in zipfile.namelist()
                 if filename.startswith('data/js/tweets/')
                 and filename.endswith('.js')]

    files.sort()

    return files


def handle_error(e):
    if isinstance(e, TwitterHTTPError):
        data = e.response_data
        if isinstance(data, dict) and 'errors' in data.keys():
            for error in data['errors']:
                if error.get('code',0) == 326:
                    # account locked lol rip
                    # although this is a temporary error in twitter terms
                    # it's best not to waste api calls on locked accounts
                    raise PermanentError(e)
    raise TemporaryError(e)