#!/usr/bin/python

import httplib2
import os
import random
import sys
import time

from apiclient.discovery import build
from apiclient.errors import HttpError
from oauth2client.file import Storage
from oauth2client.client import flow_from_clientsecrets
from oauth2client.tools import run
from optparse import OptionParser


# CLIENT_SECRETS_FILE, name of a file containing the OAuth 2.0 information for
# this application, including client_id and client_secret. You can acquire an
# ID/secret pair from the API Access tab on the Google APIs Console
#   http://code.google.com/apis/console#access
# For more information about using OAuth2 to access Google APIs, please visit:
#   https://developers.google.com/accounts/docs/OAuth2
# For more information about the client_secrets.json file format, please visit:
#   https://developers.google.com/api-client-library/python/guide/aaa_client_secrets
# Please ensure that you have enabled the YouTube Data API for your project.
CLIENT_SECRETS_FILE = "client_secrets.json"

# A limited OAuth 2 access scope that allows for uploading files, but not other
# types of account access.
YOUTUBE_READONLY_SCOPE = "https://www.googleapis.com/auth/youtube.readonly"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"

# Helpful message to display if the CLIENT_SECRETS_FILE is missing.
MISSING_CLIENT_SECRETS_MESSAGE = """
WARNING: Please configure OAuth 2.0

To make this sample run you will need to populate the client_secrets.json file
found at:

   %s

with information from the APIs Console
https://code.google.com/apis/console#access

For more information about the client_secrets.json file format, please visit:
https://developers.google.com/api-client-library/python/guide/aaa_client_secrets
""" % os.path.abspath(os.path.join(os.path.dirname(__file__),
                                   CLIENT_SECRETS_FILE))

def get_authenticated_service():
  flow = flow_from_clientsecrets(CLIENT_SECRETS_FILE,
    scope=YOUTUBE_READONLY_SCOPE,
    message=MISSING_CLIENT_SECRETS_MESSAGE)

  storage = Storage("%s-oauth2.json" % sys.argv[0])
  credentials = storage.get()

  if credentials is None or credentials.invalid:
    credentials = run(flow, storage)

  return build(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION,
    http=credentials.authorize(httplib2.Http()))


def list_streams(options):
  youtube = get_authenticated_service()

  list_streams_response = youtube.liveStreams().list(
    part="id,snippet",
    mine="true",
    maxResults=options.maxResults
  ).execute()

  if not list_streams_response["items"]:
    print "No stream was found."
    sys.exit(1)

  streams = []

  for result in list_streams_response.get("items", []):
    streams.append("%s (%s)" % (result["snippet"]["title"],result["id"]))

  print "Streams:\n", "\n".join(streams), "\n"


if __name__ == "__main__":
  parser = OptionParser()
  parser.add_option("--max-results", dest="maxResults",
    help="Max results", default=25)
  (options, args) = parser.parse_args()

  list_streams(options)
