from itertools import chain
import json
from django.http import Http404, HttpResponse, JsonResponse
from django.apps import apps
from django.views.generic import ListView
from django.views.generic.base import View, RedirectView
from django.utils.decorators import method_decorator
from django.contrib.auth.decorators import login_required
#from photos.models import LuxImage, LuxVideo
from django.shortcuts import render_to_response
from django.shortcuts import render
from django.template import RequestContext
from taggit.models import Tag
#from dal import autocomplete


class PaginatedListView(ListView):
    """
    handles my own pagination system
    """
    context_object_name = 'object_list'

    def dispatch(self, request, *args, **kwargs):
        path = request.path.split('/')[1:-1]
        if path[-1] == self.kwargs['page']:
            path = "/".join(t for t in path[:-1])
            request.page_url = "/" + path + '/%d/'
        else:
            request.page_url = request.path + '%d/'
        print(request.page_url)
        request.page = int(self.kwargs['page'])
        request.base_path = path
        return super(PaginatedListView, self).dispatch(request, *args, **kwargs)


@method_decorator(login_required, name='dispatch')
class LoggedInViewWithUser(View):

    def get_form_kwargs(self, **kwargs):
        kwargs = super().get_form_kwargs(**kwargs)
        kwargs.update({'user': self.request.user})
        return kwargs



class AjaxableResponseMixin:
    """
    Mixin to add AJAX support to a form.
    Must be used with an object-based FormView (e.g. CreateView)
    """
    def form_invalid(self, form):
        response = super().form_invalid(form)
        if self.request.is_ajax():
            return JsonResponse(form.errors, status=400)
        else:
            return response

    def form_valid(self, form):
        # We make sure to call the parent's form_valid() method because
        # it might do some processing (in the case of CreateView, it will
        # call form.save() for example).
        print(self.request.META)
        print('x request header', self.request.META['HTTP_X_REQUESTED_WITH'])
        response = super().form_valid(form)
        if self.request.is_ajax():
            data = {
                'pk': self.object.pk,
            }
            return JsonResponse(data)
        else:
            return response
'''
class TagAutocomplete(autocomplete.Select2QuerySetView):
    def get_queryset(self):
        # Don't forget to filter out results depending on the visitor !
        if not self.request.user.is_authenticated:
            return Tag.objects.none()

        qs = Tag.objects.all()

        if self.q:
            qs = qs.filter(name__istartswith=self.q)

        return qs


def nav_json(request, app, model, pk):
    model = apps.get_model(app_label=app, model_name=model)
    p = model.objects.get(pk=pk)
    data = {}
    data['prev'] = p.get_previous_admin_url
    data['next'] = p.get_next_admin_url
    data = json.dumps(data)
    return HttpResponse(data)


def insert_image(request):
    """
    The view that handles the admin insert image/video feature
    """
    images = LuxImage.objects.all()[:80]
    videos = LuxVideo.objects.all()[:10]
    object_list = sorted(
        chain(images, videos),
        key=lambda instance: instance.pub_date,
        reverse=True
    )
    return render(request, 'admin/insert_images.html', {'object_list': object_list, 'textarea_id': request.GET['textarea']})
'''