"""
Twitter - access to Twitter through bot commands
Copyright (C) 2010  Brian S. Stephan

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""

from ConfigParser import NoSectionError, NoOptionError
import oauth2 as oauth
import re
import sqlite3
from threading import Timer
import urlparse

from extlib import irclib
from extlib import twitter

from Module import Module

class Twitter(Module):

    """Access Twitter via the bot as an authenticated client."""

    def __init__(self, irc, config, server):
        """Prepare for oauth stuff (but don't execute it yet)."""

        Module.__init__(self, irc, config, server)

        # setup regexes
        getstatuspattern = '^!twitter\s+getstatus\s+(\S+)$'
        getuserstatuspattern = '^!twitter\s+getuserstatus\s+(\S+)(\s+.*|$)'
        tweetpattern = '^!twitter\s+tweet\s+(.*)'
        gettokenpattern = '^!twitter\s+gettoken$'
        authpattern = '^!twitter\s+auth\s+(\S+)$'
        replytopattern = '^!twitter\s+replyto\s+(\S+)\s+(.*)'

        self.getstatusre = re.compile(getstatuspattern)
        self.getuserstatusre = re.compile(getuserstatuspattern)
        self.tweetre = re.compile(tweetpattern)
        self.gettokenre = re.compile(gettokenpattern)
        self.authre = re.compile(authpattern)
        self.replytore = re.compile(replytopattern)

        # prep oauth magic
        self.consumer_key = 'N2aSGxBP8t3cCgWyF1B2Aw'
        self.consumer_secret = '0aQPEV4K3MMpicfi2lDtCP5pvjsKaqIpfuWtsPzx8'

        self.request_token_url = 'https://api.twitter.com/oauth/request_token'
        self.access_token_url = 'https://api.twitter.com/oauth/access_token'
        self.authorize_url = 'https://api.twitter.com/oauth/authorize'

        self.consumer = oauth.Consumer(self.consumer_key, self.consumer_secret)
        self.client = oauth.Client(self.consumer)

        # create a default twitter API account, in case we never auth
        self.twit = twitter.Api()
        self.authed = False

    def db_init(self):
        """Set up the settings table."""

        # init the table if it doesn't exist
        version = self.db_module_registered(self.__class__.__name__)
        if version == None:
            # create tables
            db = self.get_db()
            try:
                db.execute('''
                    CREATE TABLE twitter_settings (
                        since_id INTEGER NOT NULL,
                        output_channel TEXT NOT NULL
                    )''')
                db.execute('''INSERT INTO twitter_settings (since_id, output_channel) VALUES (0, '#drbotzo')''')
                db.execute('INSERT INTO drbotzo_modules VALUES (?,?)', (self.__class__.__name__, 1))
                db.commit()
            except sqlite3.Error as e:
                db.rollback()
                print("sqlite error: " + str(e))
                raise

    def shutdown(self):
        """Deauth, and make the twitter API item inoperable."""

        self.twit.ClearCredentials()
        self.authed = False

    def do(self, connection, event, nick, userhost, what, admin_unlocked):
        """Attempt to do twitter things."""

        if self.getstatusre.search(what):
            return self.reply(connection, event, self.twitter_getstatus(connection, event, nick, userhost, what, admin_unlocked))
        elif self.getuserstatusre.search(what):
            return self.reply(connection, event, self.twitter_getuserstatus(connection, event, nick, userhost, what, admin_unlocked))
        elif self.tweetre.search(what):
            return self.reply(connection, event, self.twitter_tweet(connection, event, nick, userhost, what, admin_unlocked))
        elif self.replytore.search(what):
            return self.reply(connection, event, self.twitter_replyto(connection, event, nick, userhost, what, admin_unlocked))
        elif self.gettokenre.search(what):
            return self.reply(connection, event, self.twitter_gettoken(connection, event, nick, userhost, what, admin_unlocked))
        elif self.authre.search(what):
            return self.reply(connection, event, self.twitter_auth(connection, event, nick, userhost, what, admin_unlocked))

    def twitter_getstatus(self, connection, event, nick, userhost, what, admin_unlocked):
        """Get a status by tweet ID."""

        match = self.getstatusre.search(what)
        if match:
            status = match.group(1)
            try:
                tweet = self.twit.GetStatus(status)
                return self._return_tweet_or_retweet_text(tweet=tweet, print_source=True)
            except twitter.TwitterError as e:
                return 'Couldn\'t obtain status: ' + str(e)

    def twitter_getuserstatus(self, connection, event, nick, userhost, what, admin_unlocked):
        """Get a status for a user. Allows for getting one other than the most recent."""

        match = self.getuserstatusre.search(what)
        if match:
            user = match.group(1)
            index = match.group(2)

            if index:
                index = int(index)
                if index > 0:
                    index = 0
            else:
                index = 0
            count = (-1*index) + 1

            try:
                tweets = self.twit.GetUserTimeline(screen_name=user, count=count, include_rts=True)
                if tweets:
                    tweet = tweets[-1*index]
                    return self._return_tweet_or_retweet_text(tweet=tweet)
            except twitter.TwitterError as e:
                return 'Couldn\'t obtain status: ' + str(e)

    def twitter_tweet(self, connection, event, nick, userhost, what, admin_unlocked):
        """Tweet. Needs authentication."""

        match = self.tweetre.search(what)
        if match:
            tweet = match.group(1)
            if self.authed is False:
                return 'You must be authenticated to tweet.'
            if admin_unlocked is False:
                return 'Only admins can tweet.'

            try:
                if self.twit.PostUpdates(tweet, continuation='\xe2\x80\xa6') is not None:
                    return 'Tweet(s) sent.'
                else:
                    return 'Unknown error sending tweet(s).'
            except twitter.TwitterError as e:
                return 'Couldn\'t tweet: ' + str(e)

    def twitter_replyto(self, connection, event, nick, userhost, what, admin_unlocked):
        """Reply to a tweet, in the twitter in_reply_to_status_id sense. Needs authentication."""

        match = self.replytore.search(what)
        if match:
            status_id = match.group(1)
            tweet = match.group(2)

            if self.authed is False:
                return 'You must be authenticated to tweet.'
            if admin_unlocked is False:
                return 'Only admins can tweet.'

            replyee_tweet = self.twit.GetStatus(status_id)
            target = replyee_tweet.user.screen_name.encode('utf-8', 'ignore')

            try:
                if self.twit.PostUpdate('@'+target+': '+tweet, in_reply_to_status_id=status_id) is not None:
                    return 'Tweet sent.'
                else:
                    return 'Unknown error sending tweet.'
            except twitter.TwitterError as e:
                return 'Couldn\'t tweet: ' + str(e)

    def twitter_gettoken(self, connection, event, nick, userhost, what, admin_unlocked):
        """Get an oauth token, so that the user may authenticate the bot."""

        match = self.gettokenre.search(what)
        if match:
            # get request token
            resp, content = self.client.request(self.request_token_url, "GET")
            if resp['status'] != '200':
                raise Exception("Invalid response %s." % resp['status'])

            self.request_token = dict(urlparse.parse_qsl(content))

            # have the user auth
            return 'Go to the following link in your browser: %s?oauth_token=%s and then send me the pin.' % (self.authorize_url, self.request_token['oauth_token'])

    def twitter_auth(self, connection, event, nick, userhost, what, admin_unlocked):
        """Authenticate, given a PIN (following gettoken)."""

        match = self.authre.search(what)
        if match:
            authtoken = match.group(1)
            oauth_verifier = authtoken

            # request access token
            token = oauth.Token(self.request_token['oauth_token'], self.request_token['oauth_token_secret'])
            token.set_verifier(oauth_verifier)
            client = oauth.Client(self.consumer, token)

            resp, content = client.request(self.access_token_url, "POST")
            self.access_token = dict(urlparse.parse_qsl(content))

            # finally, create the twitter API object
            self.twit = twitter.Api(self.consumer_key, self.consumer_secret, self.access_token['oauth_token'], self.access_token['oauth_token_secret'])
            self.authed = True

            # ugly, but the best place to track it. store the connection for later use
            self.connection = connection

            # print timeline stuff. this will set up the appropriate timer
            self._check_self_timeline()

            return 'The bot is now logged in.'

    def _check_self_timeline(self):
        """Check my timeline, and if there are entries, print them to the channel."""

        if self.authed:
            # get the id of the last check we made
            since_id = self._get_last_since_id()
            output_channel = self._get_output_channel()

            if since_id is not None and output_channel != '':
                tweets = self.twit.GetFriendsTimeline(since_id=since_id)
                for tweet in tweets:
                    tweet_text = self._return_tweet_or_retweet_text(tweet=tweet, print_source=True)
                    self.irc.reply(self.connection, output_channel.encode('utf-8', 'ignore'), tweet_text)

                # friends timeline printed, find the latest id
                new_since_id = self._get_latest_tweet_id(tweets, since_id)

                tweets = self.twit.GetMentions(since_id=since_id)
                for tweet in tweets:
                    tweet_text = self._return_tweet_or_retweet_text(tweet=tweet, print_source=True)
                    self.irc.reply(self.connection, output_channel.encode('utf-8', 'ignore'), tweet_text)

                # mentions printed, find the latest id
                new_since_id = self._get_latest_tweet_id(tweets, new_since_id)

                # set since_id
                self._set_last_since_id(new_since_id)

                # re-register this check
                Timer(300, self._check_self_timeline, ()).start()

    def _return_tweet_or_retweet_text(self, tweet, print_source=False):
        """
        Return a string of the author and text body of a status,
        accounting for whether or not the fetched status is a
        retweet.
        """

        if tweet.retweeted_status:
            retweet = tweet.retweeted_status
            if print_source:
                return '%s (RT %s): %s [%s]' % (tweet.user.name.encode('utf-8', 'ignore'), retweet.user.name.encode('utf-8', 'ignore'), super(Twitter, self)._unencode_xml(retweet.text.encode('utf-8', 'ignore')), tweet.id)
            else:
                return '(RT %s): %s [%s]' % (retweet.user.name.encode('utf-8', 'ignore'), super(Twitter, self)._unencode_xml(retweet.text.encode('utf-8', 'ignore')), tweet.id)
        else:
            if print_source:
                return '%s: %s [%s]' % (tweet.user.name.encode('utf-8', 'ignore'), super(Twitter, self)._unencode_xml(tweet.text.encode('utf-8', 'ignore')), tweet.id)
            else:
                return '%s [%s]' % (super(Twitter, self)._unencode_xml(tweet.text.encode('utf-8', 'ignore')), tweet.id)

    def _get_last_since_id(self):
        """Get the since_id out of the database."""

        try:
            # need to create our own db object, since this is likely going
            # to be called in a new thread
            dbfile = self.config.get('dr.botzo', 'database')
            self.conn = sqlite3.connect(dbfile)
            self.conn.row_factory = sqlite3.Row
            db = self.conn
            query = 'SELECT since_id FROM twitter_settings'
            cursor = db.execute(query)
            result = cursor.fetchone()
            if result:
                return result['since_id']
        except sqlite3.Error as e:
            print("sqlite error: " + str(e))
            raise

    def _get_output_channel(self):
        """Get the output_channel out of the database."""

        try:
            # need to create our own db object, since this is likely going
            # to be called in a new thread
            dbfile = self.config.get('dr.botzo', 'database')
            self.conn = sqlite3.connect(dbfile)
            self.conn.row_factory = sqlite3.Row
            db = self.conn
            query = 'SELECT output_channel FROM twitter_settings'
            cursor = db.execute(query)
            result = cursor.fetchone()
            if result:
                return result['output_channel']
        except sqlite3.Error as e:
            print("sqlite error: " + str(e))
            raise

    def _set_last_since_id(self, since_id):
        """Set the since_id."""

        try:
            # need to create our own db object, since this is likely going
            # to be called in a new thread
            dbfile = self.config.get('dr.botzo', 'database')
            self.conn = sqlite3.connect(dbfile)
            self.conn.row_factory = sqlite3.Row
            db = self.conn
            cur = db.cursor()
            statement = 'UPDATE twitter_settings SET since_id = ?'
            cur.execute(statement, (since_id,))
            db.commit()
        except sqlite3.Error as e:
            print("sqlite error: " + str(e))
            raise

    def _get_latest_tweet_id(self, tweets, since_id):
        """Find the latest tweet id in the provided list, or the given since_id."""

        latest = since_id
        for tweet in tweets:
            if tweet.id > latest:
                latest = tweet.id

        return latest

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