#!/usr/bin/python

# Usage example:
# python unset_watermark.py --channelId='<channel_id>' --unset

import json
import os
import sys
import httplib2

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 argparser, run_flow


# 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 Developers Console
#   https://console.developers.google.com/project/_/apiui/credential
# 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"

# An OAuth 2 access scope that allows for full read/write access.
YOUTUBE_READ_WRITE_SCOPE = "https://www.googleapis.com/auth/youtube"
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 Developers Console
https://console.developers.google.com

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))

# Authorize the request and store authorization credentials.
def get_authenticated_service(args):
  flow = flow_from_clientsecrets(CLIENT_SECRETS_FILE,
    scope=YOUTUBE_READ_WRITE_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(flow, storage, args)

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


# Call the API's watermarks.unset method to remove the watermark image.
def unset_watermark(youtube, channel_id):
  try:
    youtube.watermarks().unset(channelId=channel_id).execute()
  except HttpError as e:
    print "Error while unsetting watermark: %s" % e.content
    raise e


if __name__ == "__main__":
  argparser.add_argument("--channelid", dest="channelid",
    help="Required; id of channel whose watermark you're updating.")
  args = argparser.parse_args()

  if not args.channelid:
    argparser.print_help()
    exit()

  youtube = get_authenticated_service(args)

  unset_watermark(youtube, args.channelid)
  print "The watermark was successfully unset."