from django.core.paginator import Paginator
from django.shortcuts import get_object_or_404, redirect, render
from django.views.generic import DetailView, ListView, TemplateView

from .models import Album, Photo


class Main(TemplateView):
    template_name = "gallery/main.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        session_expiry = self.request.session.get_expiry_date()
        context['session_expiry'] = session_expiry
        return context


class AlbumsList(ListView):
    model = Album
    template_name = 'gallery/album_list.html'
    queryset = Album.objects.filter(is_public=True)
    ordering = ['-album_date']
    paginate_by = 30


class AlbumDetail(DetailView):
    model = Album
    template_name = 'gallery/album_detail.html'

    def get_object(self, queryset=None):
        return get_object_or_404(Album, slug=self.kwargs.get('album_slug'))

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        photos = self.object.photos.all().order_by('taken_at')
        paginator = Paginator(photos, 30)
        page_number = self.request.GET.get('page')
        page_obj = paginator.get_page(page_number)
        context['photos'] = page_obj.object_list
        context['page_obj'] = page_obj
        return context


class PhotosList(ListView):
    model = Photo
    paginate_by = 30
    ordering = ['-taken_at']

    
class PhotoDetail(DetailView):
    model = Photo
    slug_url_kwarg = 'photo_slug'
    template_name = 'gallery/photo_detail.html'

    def get_object(self, queryset=None):
        photo = get_object_or_404(Photo, slug=self.kwargs.get(self.slug_url_kwarg))
        
        photo_key = f'photo_{photo.slug}'
        if photo_key not in self.request.session:
            photo.add_view() 
            self.request.session[photo_key] = 0
        
        return photo