#!/usr/bin/env python
# -*- coding: utf-8 -*-

''' Django views. '''
from django.shortcuts import render, redirect, get_object_or_404
from django.urls import reverse_lazy
from django.views.generic.edit import CreateView, UpdateView, DeleteView
from django.views import View
from django.http import Http404
from django.contrib import messages
from django.contrib.auth.mixins import UserPassesTestMixin, LoginRequiredMixin

from .forms import (
    ExplorerCreationForm, 
    PlaceForm, 
    PlaceImageCreateForm
)
from .models import Place, PlaceImage, Voucher

# Create your views here.

# BaseView that checks if user is logged in.
class IsAuthenticated(LoginRequiredMixin, View):
    redirect_field_name = 'redirect_to'

# BaseView that checks if logged in user is submitter of place.
class IsSubmitter(UserPassesTestMixin, View):
    def test_func(self):
        """ Check if user is eligible to modify place. """
        if self.request.user.is_superuser:
            return True
        
        # Check if currently logged in user was the submitter
        place_obj = self.get_object()

        if self.request.user == place_obj.submitted_by:
            return True

        messages.error(
            self.request, 'You do not have permission to do this.')
        return False

class SignUpView(CreateView):
    form_class = ExplorerCreationForm
    success_url = reverse_lazy('login')
    template_name = 'signup.html'

class PlaceListView(IsAuthenticated, View):
    def get(self, request):
        context = {
            'place_list': Place.objects.all()
        }
        return render(request, 'place/place_list.html', context)

class PlaceDetailView(IsAuthenticated, View):
    def get(self, request, pk):
        context = {
            'place': Place.objects.get(pk=pk)
        }
        return render(request, 'place/place_detail.html', context)

class HomeView(View):
    def get(self, request, *args, **kwargs):
        place_list = Place.objects.all().order_by('submitted_when')[:10]
        context = {
            'place_list': place_list
        }
        return render(request, 'home.html', context)

class PlaceUpdateView(IsAuthenticated, IsSubmitter, UpdateView):
    template_name = 'place/place_update.html'
    model = Place
    form_class = PlaceForm

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

class PlaceCreateView(IsAuthenticated, 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
            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(IsAuthenticated, IsSubmitter, DeleteView):
    template_name = 'place/place_delete.html'
    model = Place
    success_url = reverse_lazy('place_list')