#!/usr/bin/env python
#
# Copyright 2014 Google Inc. All Rights Reserved.
#
# 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.
#
"""Starting template for Google App Engine applications.

Use this project as a starting point if you are just beginning to build a Google
App Engine project. Remember to download the OAuth 2.0 client secrets which can
be obtained from the Developer Console <https://code.google.com/apis/console/>
and save them as 'client_secrets.json' in the project directory.
"""

__author__ = 'jcgregorio@google.com (Joe Gregorio)'


import httplib2
import os

from googleapiclient import discovery
from oauth2client import client
from oauth2client.contrib import appengine
from google.appengine.api import memcache

import webapp2
import jinja2


JINJA_ENVIRONMENT = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
    autoescape=True,
    extensions=['jinja2.ext.autoescape'])

# CLIENT_SECRETS, name of a file containing the OAuth 2.0 information for this
# application, including client_id and client_secret, which are found
# on the API Access tab on the Google APIs
# Console <http://code.google.com/apis/console>
CLIENT_SECRETS = os.path.join(os.path.dirname(__file__), 'client_secrets.json')

# Helpful message to display in the browser if the CLIENT_SECRETS file
# is missing.
MISSING_CLIENT_SECRETS_MESSAGE = """
<h1>Warning: Please configure OAuth 2.0</h1>
<p>
To make this sample run you will need to populate the client_secrets.json file
found at:
</p>
<p>
<code>%s</code>.
</p>
<p>with information found on the <a
href="https://code.google.com/apis/console">APIs Console</a>.
</p>
""" % CLIENT_SECRETS


http = httplib2.Http(memcache)
service = discovery.build("plus", "v1", http=http)
decorator = appengine.oauth2decorator_from_clientsecrets(
    CLIENT_SECRETS,
    scope='https://www.googleapis.com/auth/plus.me',
    message=MISSING_CLIENT_SECRETS_MESSAGE)

class MainHandler(webapp2.RequestHandler):

  @decorator.oauth_aware
  def get(self):
    variables = {
        'url': decorator.authorize_url(),
        'has_credentials': decorator.has_credentials()
        }
    template = JINJA_ENVIRONMENT.get_template('grant.html')
    self.response.write(template.render(variables))


class AboutHandler(webapp2.RequestHandler):

  @decorator.oauth_required
  def get(self):
    try:
      http = decorator.http()
      user = service.people().get(userId='me').execute(http=http)
      text = 'Hello, %s!' % user['displayName']

      template = JINJA_ENVIRONMENT.get_template('welcome.html')
      self.response.write(template.render({'text': text }))
    except client.AccessTokenRefreshError:
      self.redirect('/')


app = webapp2.WSGIApplication(
    [
     ('/', MainHandler),
     ('/about', AboutHandler),
     (decorator.callback_path, decorator.callback_handler()),
    ],
    debug=True)