import json
from django.views.generic import FormView
from django.views.decorators.csrf import csrf_exempt

from django.shortcuts import  render_to_response, get_object_or_404, HttpResponse, Http404
from django.http import HttpResponseRedirect
from django.conf import settings
from photologue.forms import PhotoForm

class AdminView(FormView):
    obj = None

    def set_obj(self):
        url = self.kwargs.get('url')
        #
        if url:
            try:
                obj = self.model.objects.get(url=url)
                self.obj = obj
            except:
                raise Http404
                pass
            # obj = get_object_or_404(self.model, url=url)
            return obj
        slug = self.kwargs.get('slug')
        if slug:
            obj = get_object_or_404(self.model, slug=slug)
            self.obj = obj
            return obj
        id = self.kwargs.get('id')
        if id:
            obj = get_object_or_404(self.model, id=id)
            self.obj = obj
            return obj
        self.obj = None
        return None

    def get_context_data(self, **kwargs):
        context = super(AdminView, self).get_context_data(**kwargs)
        self.set_obj()
        context['object'] = self.obj
        context['languages'] = settings.LANGUAGES
        return context

    def form_valid(self, form):
        self.set_obj()
        form.save(obj=self.obj)
        return HttpResponseRedirect(self.success_url)
    # example get_form
    """
    def get_form(self, form_class):
        if self.request.POST:
            return super(AdminView, self).get_form(form_class)
        self.set_obj()
        if self.obj:
            obj = self.obj
            data = {}
            data['theme'] = [item.id for item in article.theme.all()]
            data['exposition'] = article.exposition
            data['conference'] = article.conference
            a = ','.join(['%s:%s'%(item.id, item.name) for item in article.tag.all()])

            data['tag'] = ','.join(['%s:%s'%(item.id, item.name) for item in article.tag.all()])
            for code, name in settings.LANGUAGES:
                obj = Article._meta.translations_model.objects.get(language_code = code,master__id=getattr(article, 'id')) #access to translated fields
                data['main_title_%s' % code] = obj.main_title
                data['preview_%s' % code] = obj.preview
                data['description_%s' % code] = obj.description
                data['title_%s' % code] = obj.title
                data['keywords_%s' % code] = obj.keywords
                data['descriptions_%s' % code] = obj.descriptions
            form = form_class(data)
            #form.fields['tag'].widget.attrs['data-init-text'] = [item.name for item in article.tag.all()]
            return form_class(data)
        else:
            return form_class()
    """


from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def paginate_results(qs, page=None):
    paginator = Paginator(qs, settings.ADMIN_PAGINATION)

    try:
        result = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        result = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        result = paginator.page(paginator.num_pages)

    return result

def stat_paginate_results(qs, page=None):
    result = paginate_results(qs, page=page)
    result.object_list = result.object_list.prefetch_related('objectstats_set')
    return result

from hvad.models import TranslatableModel

class AdminListView(FormView):
    paginate_func = staticmethod(paginate_results)
    def get_form(self, form_class):

        if self.request.GET:
            return form_class(self.request.GET)
        else:
            return form_class(**self.get_form_kwargs())

    def get(self, request, *args, **kwargs):

        if request.GET:
            form_class = self.get_form_class()
            form = self.get_form(form_class)
            if form.is_valid():
                return self.form_valid(form)
            else:
                return self.form_invalid(form)
        else:
            return super(AdminListView, self).get(request, *args, **kwargs)

    def form_valid(self, form):
        """

        filtering queryset and return paginated results

        """

        qs = form.filter()
        result = self.paginate_func(qs, page=self.request.GET.get('page'))
        context = self.get_context_data(form=form)
        context.update({'object_list': result})
        return self.render_to_response(context)

    def get_queryset(self):
        if issubclass(self.model, TranslatableModel):
            return self.model.objects.language().all().order_by('name')
        else:
            return self.model.objects.all().order_by('-modified')

    def get_context_data(self, **kwargs):
        context = super(AdminListView, self).get_context_data(**kwargs)
        qs = self.get_queryset()
        result = self.paginate_func(qs, page=self.request.GET.get('page'))
        context['object_list'] = result
        return context


# @csrf_exempt
# def upload_photo(request, id, Model):
#     """
#     uploading photo to some instance of Model
#     instance must have upload_photo method, which download photo
#
#     """
#     obj = get_object_or_404(Model, pk=id)
#     if request.method == 'POST':
#         response = {'success': False}
#         form = PhotoForm(request.POST, request.FILES)
#         if form.is_valid():
#             photo = form.save()
#             obj.upload_photo(photo)
#             response['success'] = True
#         else:
#             response.update({'errors': form.errors})
#
#         return HttpResponse(json.dumps(response), content_type='application/json')
#     else:
#         return HttpResponse('not post')