from django.views import View
from django.views.generic.edit import CreateView, UpdateView, DeleteView
from django.views.generic.detail import SingleObjectMixin
from django.views.generic import ListView

from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin

from django.shortcuts import render, redirect
from django.urls import reverse_lazy

from lostplaces_app.models import Place, PlaceImage
from lostplaces_app.views import IsAuthenticatedMixin, IsPlaceSubmitter
from lostplaces_app.forms import PlaceForm, PlaceImageCreateForm, TagSubmitForm

from taggit.models import Tag

class PlaceListView(IsAuthenticatedMixin, ListView):
    paginate_by = 5
    model = Place
    template_name = 'place/place_list.html'
    ordering = ['name']

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['map_config'] = {
            'point_list': context['place_list'],
            'map_center': Place.average_latlon(context['place_list'])
        }
        return context

class PlaceDetailView(IsAuthenticatedMixin, View):
    def get(self, request, pk):
        place = Place.objects.get(pk=pk)
        context = {
            'place': place,
            'map_config': {
                'point_list': [ place ],
                'map_center': {'latitude': place.latitude, 'longitude': place.longitude},                                
            },
            'tagging_config': {
                'all_tags': Tag.objects.all(),
                'submit_form': TagSubmitForm(),
                'tagged_item': place,
                'submit_url_name': 'place_tag_submit',
                'delete_url_name': 'place_tag_delete'
            }
        }
        return render(request, 'place/place_detail.html', context)

class PlaceUpdateView(IsAuthenticatedMixin, IsPlaceSubmitter, SuccessMessageMixin, UpdateView):
    template_name = 'place/place_update.html'
    model = Place
    form_class = PlaceForm
    success_message = 'Successfully updated place.'
    place_submitter_error_message = 'You do no have permissions to alter this place'

    def get_success_url(self):
        return reverse_lazy('place_detail', kwargs={'pk':self.get_object().pk})

    def get_place(self):
        return self.get_object()

class PlaceCreateView(IsAuthenticatedMixin, View):

    def get(self, request, *args, **kwargs):
        place_image_form = PlaceImageCreateForm()
        place_form = PlaceForm()

        context = {
            'place_form': place_form,
            'place_image_form': place_image_form
        }
        return render(request, 'place/place_create.html', context)

    def post(self, request, *args, **kwargs):
        place_form = PlaceForm(request.POST)

        if place_form.is_valid():
            submitter = request.user.explorer
            place = place_form.save(commit=False)
            # Save logged in user as "submitted_by"
            place.submitted_by = submitter
            place.save()

            if request.FILES:
                self._apply_multipart_image_upload(
                    files=request.FILES.getlist('filename'),
                    place=place, 
                    submitter=submitter
                )
            
            kwargs_to_pass = {
                'pk': place.pk
            }

            messages.success(
                self.request, 'Successfully created place.')
            return redirect(reverse_lazy('place_detail', kwargs=kwargs_to_pass))
        
        else:
            context = {
                'form': form_place
            }

            # Usually the browser should have checked the form before sending.
            messages.error(
                self.request, 'Please fill in all required fields.')
            return render(request, 'place/place_create.html', context)

    def _apply_multipart_image_upload(self, files, place, submitter):
        for image in files:
            place_image = PlaceImage.objects.create(
                filename=image,
                place=place,
                submitted_by=submitter
            )
            place_image.save()

class PlaceDeleteView(IsAuthenticatedMixin, IsPlaceSubmitter, DeleteView):
    template_name = 'place/place_delete.html'
    model = Place
    success_message = 'Successfully deleted place.'
    success_url = reverse_lazy('place_list')
    success_message = 'Place deleted'
    place_submitter_error_message = 'You do no have permission to delete this place'

    def delete(self, request, *args, **kwargs):
        messages.success(self.request, self.success_message)
        return super().delete(request, *args, **kwargs)

    def get_place(self):
        return self.get_object()