from twitter import Twitter, OAuth, TwitterHTTPError
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


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.capture(
                            'lib.twitter.creds_error',
                            stack=True,
                            data=dict(
                                locals=locals(),
                                account=account,
                            )
                        )
                db.session.delete(token)
                db.session.commit()
            else:
                # temporary error, re-raise
                raise e

    # if no tokens are valid, we log out the user so we'll get a fresh
    # token when they log in again
    account.policy_enabled = False
    account.force_log_out()
    return None


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'])
    return post


def fetch_acc(account, cursor):
    t = get_twitter_for_acc(account)
    if not t:
        print("no twitter access, aborting")
        return

    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 cursor:
        kwargs.update(cursor)

    if 'max_id' not in kwargs:
        most_recent_post = (
                Post.query.order_by(db.desc(Post.created_at))
                .filter(Post.author_id == account.id).first())
        if most_recent_post:
            kwargs['since_id'] = most_recent_post.twitter_id

    tweets = t.statuses.user_timeline(**kwargs)

    print("processing {} tweets for {acc}".format(len(tweets), acc=account))

    if len(tweets) > 0:

        kwargs['max_id'] = +inf

        for tweet in tweets:
            db.session.merge(post_from_api_tweet_object(tweet))
            kwargs['max_id'] = min(tweet['id'] - 1, kwargs['max_id'])

    else:
        kwargs = None

    db.session.commit()

    return kwargs


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

    t = get_twitter_for_acc(posts[0].author)
    if not t:
        raise Exception('shit idk. twitter says no')
    tweets = t.statuses.lookup(
                _id=",".join((post.twitter_id for post in posts)),
                trim_user=True, tweet_mode='extended')
    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))
            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