## $Id: paypal.py 12026 2014-11-21 10:01:04Z uli $
##
## Copyright (C) 2014 Uli Fouquet & Henrik Bettermann
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
import ConfigParser
import paypalrestsdk
from zope.component import queryUtility
from waeup.ikoba.interfaces import IPayPalConfig


def parse_paypal_config(path):
    """Get paypal credentials from config file.

    Returns a dict with following keys set:

      ``client_id``, ``client_secret``, ``mode``.

    Please note, that values might be `None`.
    """
    parser = ConfigParser.SafeConfigParser(
        {'id': None, 'secret': None, 'mode': 'sandbox', }
        )
    parser.readfp(open(path))
    return {
        'client_id': parser.get('rest-client', 'id', None),
        'client_secret': parser.get('rest-client', 'secret', None),
        'mode': parser.get('rest-client', 'mode', 'sandbox')
        }


def get_paypal_config_file_path():
    """Get the path of the configuration file (if any).

    If no such file is registered, we get `None`.
    """
    util = queryUtility(IPayPalConfig)
    if util is None:
        return None
    return util['path']


def get_access_token():
    """Get an access token for further calls.
    """
    conf = parse_paypal_config(get_paypal_config_file_path())
    api = paypalrestsdk.set_config(
        mode=conf['mode'],  # sandbox or live
        client_id=conf['client_id'],
        client_secret=conf['client_secret'],
        )
    return api.get_access_token()