#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Twitter search integration for Zulip
#
# Copyright © 2014 Zulip, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

from __future__ import print_function
import os
import sys
import optparse
from six.moves.configparser import ConfigParser, NoSectionError, NoOptionError

import zulip
VERSION = "0.9"
CONFIGFILE = os.path.expanduser("~/.zulip_twitterrc")

def write_config(config, since_id):
    # type: (ConfigParser, int) -> None
    if 'search' not in config.sections():
        config.add_section('search')
    config.set('search', 'since_id', since_id)
    with open(CONFIGFILE, 'wb') as configfile:
        config.write(configfile)

parser = optparse.OptionParser(r"""

%prog --user username@example.com --api-key a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 \
    --search="@nprnews,quantum physics"

Send Twitter search results to a Zulip stream.

Depends on: https://github.com/bear/python-twitter version 3.1

To use this script:

0. Use `pip install python-twitter` to install `python-twitter`.
1. Set up Twitter authentication, as described below
2. Subscribe to the stream that will receive Twitter updates (default stream: twitter)
3. Test the script by running it manually, like this:

/usr/local/share/zulip/integrations/twitter/twitter-search-bot \
    --search="@nprnews,quantum physics" --site=https://zulip.example.com

4. Configure a crontab entry for this script. A sample crontab entry
that will process tweets every 5 minutes is:

*/5 * * * * /usr/local/share/zulip/integrations/twitter/twitter-search-bot [options]

== Setting up Twitter authentications ==

Run this on a personal or trusted machine, because your API key is
visible to local users through the command line or config file.

This bot uses OAuth to authenticate with Twitter. Please create a
~/.zulip_twitterrc with the following contents:

[twitter]
consumer_key =
consumer_secret =
access_token_key =
access_token_secret =

In order to obtain a consumer key & secret, you must register a
new application under your Twitter account:

1. Go to http://dev.twitter.com
2. Log in
3. In the menu under your username, click My Applications
4. Create a new application

Make sure to go the application you created and click "create my
access token" as well. Fill in the values displayed.
""")

parser.add_option('--search',
                  dest='search_terms',
                  help='Terms to search on',
                  action='store')
parser.add_option('--stream',
                  dest='stream',
                  help='The stream to which to send tweets',
                  default="twitter",
                  action='store')
parser.add_option('--limit-tweets',
                  default=15,
                  type='int',
                  help='Maximum number of tweets to send at once')

parser.add_option_group(zulip.generate_option_group(parser))
(opts, args) = parser.parse_args()

if not opts.search_terms:
    parser.error('You must specify a search term.')

try:
    config = ConfigParser()
    config.read(CONFIGFILE)

    consumer_key = config.get('twitter', 'consumer_key')
    consumer_secret = config.get('twitter', 'consumer_secret')
    access_token_key = config.get('twitter', 'access_token_key')
    access_token_secret = config.get('twitter', 'access_token_secret')
except (NoSectionError, NoOptionError):
    parser.error("Please provide a ~/.zulip_twitterrc")

if not (consumer_key and consumer_secret and access_token_key and access_token_secret):
    parser.error("Please provide a ~/.zulip_twitterrc")

try:
    since_id = config.getint('search', 'since_id')
except (NoOptionError, NoSectionError):
    since_id = 0

try:
    import twitter
except ImportError:
    parser.error("Please install twitter-python")

api = twitter.Api(consumer_key=consumer_key,
                  consumer_secret=consumer_secret,
                  access_token_key=access_token_key,
                  access_token_secret=access_token_secret)

user = api.VerifyCredentials()

if not user.id:
    print("Unable to log in to twitter with supplied credentials. Please double-check and try again")
    sys.exit()

client = zulip.Client(
    email=opts.zulip_email,
    api_key=opts.zulip_api_key,
    site=opts.zulip_site,
    client="ZulipTwitterSearch/" + VERSION,
    verbose=True)

search_query = " OR ".join(opts.search_terms.split(","))
statuses = api.GetSearch(search_query, since_id=since_id)

for status in statuses[::-1][:opts.limit_tweets]:
    # https://twitter.com/eatevilpenguins/status/309995853408530432
    composed = "%s (%s)" % (status.user.name,
                            status.user.screen_name)
    url = "https://twitter.com/%s/status/%s" % (status.user.screen_name,
                                                status.id)
    content = status.text

    search_term_used = None
    for term in opts.search_terms.split(","):
        if term.lower() in content.lower():
            search_term_used = term
            break
    # For some reason (perhaps encodings or message tranformations we
    # didn't anticipate), we don't know what term was used, so use a
    # default.
    if not search_term_used:
        search_term_used = "mentions"

    message = {
        "type": "stream",
        "to": [opts.stream],
        "subject": search_term_used,
        "content": url,
    }

    ret = client.send_message(message)

    if ret['result'] == 'error':
        # If sending failed (e.g. no such stream), abort and retry next time
        print("Error sending message to zulip: %s" % ret['msg'])
        break
    else:
        since_id = status.id

write_config(config, since_id)
