from django.core.urlresolvers import reverse_lazy, reverse
from django.http import JsonResponse, HttpResponse, HttpResponseRedirect
from django.utils import timezone
from django.views.decorators.http import etag
from django.views.generic import View, ListView, DetailView

from .models import DTYSModel

import logging

log = logging.getLogger(__name__)


def get_change(current, previous):
    if current == previous:
        return 100.0
    try:
        return (abs(current - previous) / previous) * 100.0
    except ZeroDivisionError:
        return 0


class DTYSListView(ListView):
    model = DTYSModel
    template_name = "dtys/index.jinja"

    def get_queryset(self, *args, **kwargs):
        qs = super(DTYSListView, self).get_queryset(*args, **kwargs)
        qs = qs.filter(
            is_public=True,
            start_date__lte=timezone.now().date(),
            end_date__gte=timezone.now().date(),
            start_time__lte=timezone.now().time(),
            end_time__gte=timezone.now().time()
        )
        return qs


class DTYSBuyView(DetailView):
    model = DTYSModel

    def get(self, request, *args, **kwargs):
        obj = self.get_object()

        log.debug(obj.id)

        if obj.is_public and not obj.is_stopped:
            from store.cart import Cart, CartItem
            from store.models import ProductVariation

            # stop DTYS for this product
            obj.stop()

            # Add to cart
            cart = Cart(self.request)
            try:
                item_variant = ProductVariation.objects.get(pk=obj.product.pk)
            except ProductVariation.DoesNotExist:
                return HttpResponseRedirect('/')

            cart.add_item(CartItem(item_variant, 1))

            return HttpResponseRedirect('/store/cart/')

        return HttpResponseRedirect('/dtys/')


def latest_entry(request):
    d = DTYSModel.objects.filter(
        is_public=True,
        is_stopped=False
    )

    if d.count() > 0:
        pass

    return "myETAG" + str(timezone.now().second)


@etag(latest_entry)
def dtys_modified(request):
    return HttpResponse('')


class DTYSInfoView(View):
    """Ajax info"""

    def get(self, request):
        data = {
            "dtys_list": []
        }

        dtys_list = DTYSModel.objects.filter(
            is_public=True,
            start_date__lte=timezone.now(),
            end_date__gte=timezone.now(),
            start_time__lte=timezone.now().time()
        )

        for i in dtys_list:
            if i.end_time <= timezone.now().time():
                i.stop()

            dtys_item = {
                'id': i.id,
                'stopped': i.is_stopped
            }

            if not i.is_stopped:
                dtys_item['current_price'] = i.current_price_format()

            data['dtys_list'].append(dtys_item)

        return JsonResponse(data)