import os
import sys

from apiclient import discovery
from oauth2client import client
from oauth2client import tools


def main():
    config_dir = get_config_dir()
    if not os.path.exists(config_dir):
        os.makedirs(config_dir)

    creds_path = os.path.join(config_dir, 'creds.json')
    store = oauth2client.file.Storage(creds_path)
    creds = store.get()

    if not creds or creds.invalid:
        flow = client.flow_from_clientsecrets(
            get_client_secrets(),
            scope='https://www.googleapis.com/auth/gmail.readonly'
        )
        flow.user_agent = 'Buch Bedford Water Bill'
        creds = tools.run(flow, store)

    http = creds.authorize(httplib2.Http())
    service = discovery.build('gmail', 'v1', http=http)

    results = service.users().messages().list(userId='me').execute()
    labels = results.get('labels', [])

    return 0


def get_client_secrets():
    return os.environ.get('CLIENT_SECRETS_JSON', 'client_secrets.json')


def get_config_dir():
    return os.path.expanduser(os.environ.get('config_dir', '~/.config/bbwb'))


if __name__ == '__main__':
    sys.exit(main())