#!/usr/bin/env python

# Copyright 2007-2016 The Python-Twitter Developers

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# ----------------------------------------------------------------------

# This file demonstrates how to track mentions of a specific set of users in 
# english language and archive those mentions to a local file. The output
# file will contain one JSON string per line per Tweet.

# To use this example, replace the W/X/Y/Zs with your keys obtained from
# Twitter, or uncomment the lines for getting an environment variable. If you
# are using a virtualenv on Linux, you can set environment variables in the
# ~/VIRTUALENVDIR/bin/activate script.

# If you need assistance with obtaining keys from Twitter, see the instructions
# in doc/getting_started.rst.

import os
import json

from twitter import Api

# Either specify a set of keys here or use os.getenv('CONSUMER_KEY') style
# assignment:

CONSUMER_KEY = 'WWWWWWWW'
# CONSUMER_KEY = os.getenv("CONSUMER_KEY", None)
CONSUMER_SECRET = 'XXXXXXXX'
# CONSUMER_SECRET = os.getenv("CONSUMER_SECRET", None)
ACCESS_TOKEN = 'YYYYYYYY'
# ACCESS_TOKEN = os.getenv("ACCESS_TOKEN", None)
ACCESS_TOKEN_SECRET = 'ZZZZZZZZ'
# ACCESS_TOKEN_SECRET = os.getenv("ACCESS_TOKEN_SECRET", None)

# Users to watch for should be a list. This will be joined by Twitter and the
# data returned will be for any tweet mentioning:
# @twitter *OR* @twitterapi *OR* @support.
USERS = ['@twitter',
         '@twitterapi',
         '@support']

# Languages to filter tweets by is a list. This will be joined by Twitter
# to return data mentioning tweets only in the english language.
LANGUAGES = ['en']

# Since we're going to be using a streaming endpoint, there is no need to worry
# about rate limits.
api = Api(CONSUMER_KEY,
          CONSUMER_SECRET,
          ACCESS_TOKEN,
          ACCESS_TOKEN_SECRET)


def main():
    with open('output.txt', 'a') as f:
        # api.GetStreamFilter will return a generator that yields one status
        # message (i.e., Tweet) at a time as a JSON dictionary.
        for line in api.GetStreamFilter(track=USERS, languages=LANGUAGES):
            f.write(json.dumps(line))
            f.write('\n')


if __name__ == '__main__':
    main()