"""
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/>.
"""

import urlparse
import oauth2 as oauth

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, config, server, modlist):
        """
        Prompt the user for oauth stuff when starting up.

        TODO: make this optional, and have API calls log if they need auth.
        """

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

        # begin oauth magic
        consumer_key = 'N2aSGxBP8t3cCgWyF1B2Aw'
        consumer_secret = '0aQPEV4K3MMpicfi2lDtCP5pvjsKaqIpfuWtsPzx8'

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

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

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

        request_token = dict(urlparse.parse_qsl(content))

        # have the user auth
        print('Go to the following link in your browser:')
        print('%s?oauth_token=%s' % (authorize_url, request_token['oauth_token']))

        # verify user auth
        oauth_verifier = raw_input('Enter the PIN you are provided: ')

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

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

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

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

        whats = what.split(' ')
        if whats[0] == 'twitter' and len(whats) >= 2:
            if whats[1] == 'status' and len(whats) == 3:
                try:
                    tweet = self.twit.GetStatus(whats[2])
                    return self.reply(connection, replypath, self.tweet_or_retweet_text(tweet=tweet, print_source=True))
                except twitter.TwitterError as e:
                    return self.reply(connection, replypath, 'Couldn\'t obtain status: ' + str(e))
            elif whats[1] == 'user' and len(whats) == 3:
                try:
                    tweets = self.twit.GetUserTimeline(screen_name=whats[2], count=30, include_rts=True)
                    if tweets:
                        tweet = tweets[0]
                        return self.reply(connection, replypath, self.tweet_or_retweet_text(tweet=tweet))
                except twitter.TwitterError as e:
                    return self.reply(connection, replypath, 'Couldn\'t obtain status: ' + str(e))

    def 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' % (tweet.user.name.encode('utf-8', 'ignore'), retweet.user.name.encode('utf-8', 'ignore'), retweet.text.encode('utf-8', 'ignore'))
            else:
                return '(RT %s): %s' % (retweet.user.name.encode('utf-8', 'ignore'), retweet.text.encode('utf-8', 'ignore'))
        else:
            if print_source:
                return '%s: %s' % (tweet.user.name.encode('utf-8', 'ignore'), tweet.text.encode('utf-8', 'ignore'))
            else:
                return '%s' % (tweet.text.encode('utf-8', 'ignore'))

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