# lingo - basket and payment system
# Copyright (C) 2015  Entr'ouvert
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import csv
import datetime
from dateutil import parser as date_parser

from django.core.urlresolvers import reverse_lazy
from django.db.models import Q
from django.utils import six
from django.utils.timezone import make_aware
from django.views.generic import CreateView, UpdateView, ListView, DeleteView
from django.http import HttpResponse

import eopayment

from .forms import RegieForm
from .models import PaymentBackend, Regie, Transaction


class RegieListView(ListView):
    model = Regie


class RegieCreateView(CreateView):
    model = Regie
    fields = ['label', 'slug', 'description', 'payment_backend']
    success_url = reverse_lazy('lingo-manager-regie-list')


class RegieUpdateView(UpdateView):
    model = Regie
    form_class = RegieForm
    success_url = reverse_lazy('lingo-manager-regie-list')


class RegieDeleteView(DeleteView):
    model = Regie
    success_url = reverse_lazy('lingo-manager-regie-list')


class PaymentBackendListView(ListView):
    model = PaymentBackend


class PaymentBackendCreateView(CreateView):
    model = PaymentBackend
    fields = '__all__'
    success_url = reverse_lazy('lingo-manager-paymentbackend-list')


class PaymentBackendUpdateView(UpdateView):
    model = PaymentBackend
    fields = '__all__'
    success_url = reverse_lazy('lingo-manager-paymentbackend-list')


class PaymentBackendDeleteView(DeleteView):
    model = PaymentBackend
    success_url = reverse_lazy('lingo-manager-paymentbackend-list')


class TransactionListView(ListView):
    model = Transaction
    paginate_by = 10

    def get_context_data(self, **kwargs):
        context = super(TransactionListView, self).get_context_data(**kwargs)
        context['query'] = self.request.GET.get('q') or ''
        return context

    def get_queryset(self):
        qs = Transaction.objects.filter(
                status__in=(eopayment.PAID, eopayment.ACCEPTED)).order_by('-start_date')
        query = self.request.GET.get('q')
        if query:
            try:
                date = date_parser.parse(query, dayfirst=True)
            except:
                qs = qs.filter(
                        Q(order_id=query) |
                        Q(bank_transaction_id=query) |
                        Q(items__subject__icontains=query)
                        )
            else:
                date = make_aware(date)
                qs = qs.filter(start_date__gte=date, start_date__lt=date + datetime.timedelta(days=1))
        return qs


def download_transactions_csv(request):
    response = HttpResponse(content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename="transactions.csv"'
    writer = csv.writer(response)
    transactions = Transaction.objects.filter(
            status__in=(eopayment.PAID, eopayment.ACCEPTED)).order_by('-start_date')
    for transaction in transactions:
        row = [transaction.order_id,
               transaction.bank_transaction_id,
               transaction.start_date.strftime('%Y-%m-%d %H:%M:%S'),
               transaction.get_user_name(),
               str(transaction.amount)]
        for item in transaction.items.all():
            row.extend([item.subject, str(item.amount)])
        if six.PY3:
            writer.writerow([x for x in row])
        else:
            writer.writerow([unicode(x).encode('utf-8') for x in row])
    return response