#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  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
#

"""
View classes for CSV export.

$Id$
"""

import csv
from cStringIO import StringIO
import itertools
from zope import component
from zope.cachedescriptors.property import Lazy
from cybertools.composer.interfaces import IInstance
from cybertools.composer.schema.interfaces import ISchema
from cybertools.stateful.interfaces import IStateful


class RegistrationsExportCsv(object):

    encoding = 'ISO8859-15'

    def __init__(self, context, request):
        self.context = context
        self.request = request

    def setHeaders(self, size, filename=None):
        filename = filename or 'registrations.csv'
        response = self.request.response
        response.setHeader('Content-Disposition',
                           'attachment; filename=%s' % filename)
        response.setHeader('Content-Type', 'text/x-comma-separated-values')
        response.setHeader('Content-Length', size)

    def getData(self):
        withTemporary = self.request.get('with_temporary')
        yield ['Service', 'Client ID', 'Organization', 'First Name', 'Last Name', 'E-Mail',
               'Number', 'State']
        for service in self.context.getServices():
            for clientName, reg in service.registrations.items():
                client = reg.client
                data = IInstance(client).applyTemplate()
                state = IStateful(reg).getStateObject()
                if state.name == 'temporary' and not withTemporary:
                    continue
                yield [self.encode(service.title) or service.name,
                       clientName,
                       self.encode(data.get('standard.organization', '')),
                       self.encode(data.get('standard.lastName', '')),
                       self.encode(data.get('standard.firstName', '')),
                       self.encode(data.get('standard.email', '')),
                       reg.number,
                       state.title
                ]

    def getAllDataInColumns(self):
        """ Yield all data available, with a column for each service and
            columns for all data fields of all data templates.
        """
        withTemporary = self.request.get('with_temporary')
        context = self.context
        services = context.getServices()
        schemas = [s for s in context.getClientSchemas() if ISchema.providedBy(s)]
        yield (['Client ID']
             + list(itertools.chain(*[[self.encode(f.title)
                                            for f in s.fields]
                                                    for s in schemas]))
             + [self.encode(s.title) for s in services])
        clients = context.getClients()
        for name, client in clients.items():
            hasRegs = False
            regs = []
            for service in services:
                reg = service.registrations.get(name)
                if reg is None:
                    regs.append(0)
                else:
                    state = IStateful(reg).getStateObject()
                    if state.name == 'temporary' and not withTemporary:
                        regs.append(0)
                    else:
                        number = reg.number
                        regs.append(reg.number)
                        if number:
                            hasRegs = True
            if not hasRegs:
                continue
            result = [name]
            for schema in schemas:
                instance = IInstance(client)
                instance.template = schema
                data = instance.applyTemplate()
                for f in schema.fields:
                    result.append(self.encode(data.get(f.name, '')))
            result += regs
            yield result

    def render(self):
        methodName = self.request.get('get_data_method', 'getAllDataInColumns')
        method = getattr(self, methodName, self.getData)
        output = StringIO()
        csv.writer(output, dialect='excel', delimiter=';').writerows(method())
        result = output.getvalue()
        self.setHeaders(len(result))
        return result

    def render2(self):
        # using cybertools.reporter.resultset
        rs = self.getData()     # should return a ResultSet
        result = rs.asCsv()
        self.setHeaders(len(result))
        return result

    def encode(self, text):
        if type(text) is unicode:
            text = text.encode(self.encoding)
        return text