## $Id: container.py 12090 2014-11-29 07:57:51Z henrik $
##
## 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
##
"""
Containers for customers.
"""
import grok
from thread import allocate_lock
from transaction import commit
from zope.component import getUtility
from waeup.ikoba.customers.interfaces import (
    ICustomersContainer, ICustomer, ICustomersUtils)
from waeup.ikoba.utils.helpers import attrs_to_fields
from waeup.ikoba.utils.logger import Logger

lock = allocate_lock()  # a lock object to lock threads.


class CustomersContainer(grok.Container, Logger):
    """
    The node containing the customer models
    """

    grok.implements(ICustomersContainer)

    _curr_cust_id = 10 ** 6

    logger_name = 'waeup.ikoba.${sitename}.customers'
    logger_filename = 'customers.log'

    @property
    def unique_customer_id(self):
        """A unique customer id.

        The customer id returned is guaranteed to be unique. It
        consists of some prefix (normally a single letter) followed by
        a number with at least 7 digits.

        Once a customer id was issued, it won't be issued again.

        Obtaining a customer id is currently not thread-safe but can be
        made easily by enabling commented lines.
        """
        prefix = getUtility(ICustomersUtils).CUSTOMER_ID_PREFIX

        # lock.acquire() # lock data
        new_id = u'%s%s' % (prefix, self._curr_cust_id)
        self._curr_cust_id += 1
        # self._p_changed = True
        # commit()
        # lock.release() # end of lock
        return new_id

    def addCustomer(self, customer):
        """Add a customer with subcontainers.
        """
        if not ICustomer.providedBy(customer):
            raise TypeError(
                'CustomersContainers contain only ICustomer instances')
        self[customer.customer_id] = customer
        return

CustomersContainer = attrs_to_fields(CustomersContainer)