## $Id: batching.py 7268 2011-12-04 17:40:41Z henrik $
##
## Copyright (C) 2011 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
##
"""Batch processing for applicants.
"""
import csv
import grok
from zope.interface import Interface
from zope.component import queryUtility
from zope.catalog.interfaces import ICatalog
from waeup.sirp.interfaces import IBatchProcessor, IObjectConverter
from waeup.sirp.utils.batching import BatchProcessor
from waeup.sirp.applicants.interfaces import (
    IApplicantsContainer, IApplicant, IApplicantUpdateByRegNo)

class ApplicantsContainerImporter(BatchProcessor):
    """An importer for applicants containers.
    """
    grok.implements(IBatchProcessor)
    grok.provides(IBatchProcessor)
    grok.context(Interface)
    util_name = 'applicants container importer'
    grok.name(util_name)

    name = u'Applicants Container Importer'
    mode = u'create'
    iface = IApplicantsContainer

    location_fields = ['code',]
    factory_name = 'waeup.ApplicantsContainer'

    def parentsExist(self, row, site):
        return 'applicants' in site.keys()

    def entryExists(self, row, site):
        return row['code'] in site['applicants'].keys()

    def getParent(self, row, site):
        return site['applicants']

    def getEntry(self, row, site):
        if not self.entryExists(row, site):
            return None
        parent = self.getParent(row, site)
        return parent.get(row['code'])

    def addEntry(self, obj, row, site):
        parent = self.getParent(row, site)
        parent[row['code']] = obj
        return

    def delEntry(self, row, site):
        parent = self.getParent(row, site)
        del parent[row['code']]
        return

class ApplicantImporter(BatchProcessor):
    """A batch processor for IApplicant objects.
    """
    grok.implements(IBatchProcessor)
    grok.provides(IBatchProcessor)
    grok.context(Interface)
    util_name = 'applicantimporter'
    grok.name(util_name)
    name = u'Applicant Importer'
    iface = IApplicant
    location_fields = []
    factory_name = 'waeup.Applicant'
    location_fields = ['container_code']

    mode = None

    @property
    def available_fields(self):
        return sorted(list(set(
            ['application_number','reg_no'] + getFields(
                self.iface).keys())))

    def checkHeaders(self, headerfields, mode='create'):
        if not 'reg_no' in headerfields and not 'application_number' \
            in headerfields:
            raise FatalCSVError(
                "Need at least columns application_number or reg_no ")
        if mode == 'create':
            for field in self.required_fields:
                if not field in headerfields:
                    raise FatalCSVError(
                        "Need at least columns %s for import!" %
                        ', '.join(["'%s'" % x for x in self.required_fields]))
        # Check for fields to be ignored...
        not_ignored_fields = [x for x in headerfields
                              if not x.startswith('--')]
        if len(set(not_ignored_fields)) < len(not_ignored_fields):
            raise FatalCSVError(
                "Double headers: each column name may only appear once.")
        return True

    def getLocator(self, row):
        #if 'application_number' in row.keys() and row['application_number']:
        if row.get('application_number',None):
            return 'application_number'
        elif 'reg_no' in row.keys() and row['reg_no']:
            return 'reg_no'
        else:
            return None

    def getParent(self, row, site):
        if not 'applicants' in site.keys():
            return False
        return site['applicants'][row['container_code']]

    def parentsExist(self, row, site):
        return self.getParent(row, site) is not None

    def getEntry(self, row, site):
        if not self.parentsExist(row, site):
            return None
        parent = self.getParent(row, site)
        if self.getLocator(row) == 'application_number':
            if row['application_number'] in parent:
                applicant = parent[row['application_number']]
                return applicant
        elif self.getLocator(row) == 'reg_no':
            reg_no = row['reg_no']
            cat = queryUtility(ICatalog, name='applicants_catalog')
            results = list(
                cat.searchResults(reg_no=(reg_no, reg_no)))
            if results:
                return results[0]
        return None

    def entryExists(self, row, site):
        return self.getEntry(row, site) is not None

    def addEntry(self, obj, row, site):
        parent = self.getParent(row, site)
        parent.addApplicant(obj)
        return

    def delEntry(self, row, site):
        applicant = self.getEntry(row, site)
        if applicant is not None:
            parent = self.getParent(row, site)
            del parent[applicant.application_number]
        pass

    def getMapping(self, path, headerfields, mode):
        """Get a mapping from CSV file headerfields to actually used fieldnames.
        """
        result = dict()
        reader = csv.reader(open(path, 'rb'))
        raw_header = reader.next()
        for num, field in enumerate(headerfields):
            if field not in ['container_code',
                'application_number', 'reg_no'] and mode == 'remove':
                continue
            if field == u'--IGNORE--':
                # Skip ignored columns in failed and finished data files.
                continue
            result[raw_header[num]] = field
        return result

    def checkConversion(self, row, mode='create'):
        """Validates all values in row.
        """
        if mode in ['update', 'remove']:
            if self.getLocator(row) == 'reg_no':
                iface = IApplicantUpdateByRegNo
        else:
            iface = self.iface
        converter = IObjectConverter(iface)
        errs, inv_errs, conv_dict =  converter.fromStringDict(
            row, self.factory_name)
        return errs, inv_errs, conv_dict