## $Id: export.py 12056 2014-11-25 11:44:47Z 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
##
"""Exporters for customer related stuff.
"""
import os
import grok
from datetime import datetime
from zope.component import getUtility
from waeup.ikoba.interfaces import (
    IExtFileStore, IFileStoreNameChooser)
from waeup.ikoba.interfaces import MessageFactory as _
from waeup.ikoba.customers.catalog import CustomersQuery
from waeup.ikoba.customers.interfaces import (
    ICustomer, ICSVCustomerExporter, ICustomerDocument)
from waeup.ikoba.utils.batching import ExporterBase
from waeup.ikoba.utils.helpers import iface_names, to_timezone

#: A tuple containing all exporter names referring to customers or
#: subobjects thereof.
EXPORTER_NAMES = ('customers', 'customerdocuments')


def get_customers(site, cust_filter=CustomersQuery()):
    """Get all customers registered in catalog in `site`.
    """
    return cust_filter.query()

def get_documents(customers):
    """Get all documents of `customers`.
    """
    documents = []
    for customer in customers:
        for document in customer.get('documents', {}).values():
            documents.append(document)
    return documents


class CustomerExporterBase(ExporterBase):
    """Exporter for customers or related objects.

    This is a baseclass.
    """
    grok.baseclass()
    grok.implements(ICSVCustomerExporter)
    grok.provides(ICSVCustomerExporter)

    def filter_func(self, x, **kw):
        return x

    def get_filtered(self, site, **kw):
        """Get customers from a catalog filtered by keywords.

        customers_catalog is the default catalog. The keys must be valid
        catalog index names.
        Returns a simple empty list, a list with `Customer`
        objects or a catalog result set with `Customer`
        objects.

        .. seealso:: `waeup.ikoba.customers.catalog.CustomersCatalog`

        """
        # Pass only given keywords to create FilteredCatalogQuery objects.
        # This way we avoid
        # trouble with `None` value ambivalences and queries are also
        # faster (normally less indexes to ask). Drawback is, that
        # developers must look into catalog to see what keywords are
        # valid.
        query = CustomersQuery(**kw)
        return query.query()

    def export(self, values, filepath=None):
        """Export `values`, an iterable, as CSV file.

        If `filepath` is ``None``, a raw string with CSV data is returned.
        """
        writer, outfile = self.get_csv_writer(filepath)
        for value in values:
            self.write_item(value, writer)
        return self.close_outfile(filepath, outfile)

    def export_all(self, site, filepath=None):
        """Export customers into filepath as CSV data.

        If `filepath` is ``None``, a raw string with CSV data is returned.
        """
        return self.export(self.filter_func(get_customers(site)), filepath)

    def export_customer(self, customer, filepath=None):
        return self.export(self.filter_func([customer]), filepath=filepath)

    def export_filtered(self, site, filepath=None, **kw):
        """Export items denoted by `kw`.

        If `filepath` is ``None``, a raw string with CSV data should
        be returned.
        """
        data = self.get_filtered(site, **kw)
        return self.export(self.filter_func(data, **kw), filepath=filepath)


class CustomersExporter(grok.GlobalUtility, CustomerExporterBase):
    """Exporter for Customers.
    """
    grok.name('customers')

    #: Fieldnames considered by this exporter
    fields = tuple(sorted(iface_names(ICustomer))) + (
        'password', 'state', 'history',)

    #: The title under which this exporter will be displayed
    title = _(u'Customers')

    def mangle_value(self, value, name, context=None):
        if name == 'history':
            value = value.messages
        if name == 'phone' and value is not None:
            # Append hash '#' to phone numbers to circumvent
            # unwanted excel automatic
            value = str('%s#' % value)
        return super(
            CustomersExporter, self).mangle_value(
            value, name, context=context)

class CustomerDocumentsExporter(grok.GlobalUtility, CustomerExporterBase):
    """Exporter for CustomerDocument instances.
    """
    grok.name('customerdocuments')

    #: Fieldnames considered by this exporter
    fields = tuple(
        sorted(iface_names(
            ICustomerDocument,
            exclude_attribs=False,
            omit=['is_editable',
                  'translated_state',
                  'formatted_transition_date',
                  'translated_class_name']))) + (
            'customer_id',)

    #: The title under which this exporter will be displayed
    title = _(u'Customer Documents')

    def filter_func(self, x, **kw):
        return get_documents(x, **kw)

    def mangle_value(self, value, name, context=None):
        """Treat location values special.
        """
        if name == 'history':
            value = value.messages
        if context is not None:
            customer = context.customer
            if name in ('customer_id',) and customer is not None:
                value = getattr(customer, name, None)
        return super(
            CustomerDocumentsExporter, self).mangle_value(
            value, name, context=context)