## $Id: utils.py 12035 2014-11-22 10:14:38Z 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
##
"""General helper functions and utilities for the customer section.
"""
import re
import os
import grok
from waeup.ikoba.interfaces import MessageFactory as _
from waeup.ikoba.interfaces import CREATED, STARTED, REQUESTED, APPROVED
from waeup.ikoba.customers.interfaces import ICustomersUtils

RE_CUSTID_NON_NUM = re.compile('[^\d]+')

def generate_customer_id():
    customers = grok.getSite()['customers']
    new_id = customers.unique_customer_id
    return new_id

def path_from_custid(customer_id):
    """Convert a customer_id into a predictable relative folder path.

    Used for storing files.

    Returns the name of folder in which files for a particular customer
    should be stored. This is a relative path, relative to any general
    customers folder with 5 zero-padded digits (except when customer_id
    is overlong).

    We normally map 1,000 different customer ids into one single
    path. For instance ``K1000000`` will give ``01000/K1000000``,
    ``K1234567`` will give ``0123/K1234567`` and ``K12345678`` will
    result in ``1234/K12345678``.

    For lower numbers < 10**6 we return the same path for up to 10,000
    customer_ids. So for instance ``KM123456`` will result in
    ``00120/KM123456`` (there will be no path starting with
    ``00123``).

    Works also with overlong number: here the leading zeros will be
    missing but ``K123456789`` will give reliably
    ``12345/K123456789`` as expected.
    """
    # remove all non numeric characters and turn this into an int.
    num = int(RE_CUSTID_NON_NUM.sub('', customer_id))
    if num < 10**6:
        # store max. of 10000 custs per folder and correct num for 5 digits
        num = num / 10000 * 10
    else:
        # store max. of 1000 custs per folder
        num = num / 1000
    # format folder name to have 5 zero-padded digits
    folder_name = u'%05d' % num
    folder_name = os.path.join(folder_name, customer_id)
    return folder_name

class CustomersUtils(grok.GlobalUtility):
    """A collection of methods subject to customization.
    """
    grok.implements(ICustomersUtils)

    #: A prefix used when generating new customer ids. Each customer id will
    #: start with this string. The default is 'K'.
    CUSTOMER_ID_PREFIX = u'K'

    CUSTMANAGE_STATES = (STARTED,)

    DOCMANAGE_STATES = (APPROVED,)

    SKIP_UPLOAD_VIEWLETS = ()

    TRANSLATED_STATES = {
        CREATED: _('created'),
        STARTED: _('started'),
        REQUESTED: _('requested'),
        APPROVED: _('approved'),
        }