from django.http import Http404, HttpResponse
from django.shortcuts import get_object_or_404, redirect
from django.views.generic import ListView, TemplateView

from mainsite.models import Publication, PublicationYear, SiteConfiguration


def robots_view(request):
    """Robots.txt view"""
    body = "User-Agent: *\nDisallow: /\nAllow: /$\n"
    return HttpResponse(body, content_type="text/plain")


class HomeView(TemplateView):
    """Website's homepage"""

    template_name = "mainsite/homepage.html"


class WriteArticleView(TemplateView):
    """Tell the readers how they can contribute to the BOcal"""

    template_name = "mainsite/write_article.html"


class PublicationListView(ListView):
    """
    Display a list of publications (generic class).
    """

    model = Publication
    context_object_name = "publications"
    template_name = "mainsite/publications_list_view.html"

    def get_context_data(self, **kwargs):
        ctx = super().get_context_data(**kwargs)

        if len(ctx["publications"]) == 0:
            raise Http404

        return ctx


class YearView(PublicationListView):
    """Display a year worth of BOcals"""

    def get_queryset(self):
        year: int = self.kwargs.get("year")
        nYear: int = self.kwargs.get("nYear")

        if nYear != year + 1:
            raise Http404

        self.publication_year = get_object_or_404(PublicationYear, startYear=year)

        return self.publication_year.publis()

    def get_context_data(self, **kwargs):
        return super().get_context_data(
            intro_text=self.publication_year.descr,
            is_year_view=True,
            year_range=self.publication_year.prettyName,
            **kwargs
        )


class SpecialPublicationsView(PublicationListView):
    """Display the list of special publications"""

    ordering = "-date"

    def get_queryset(self):
        return super().get_queryset().filter(is_special=True)

    def get_context_data(self, **kwargs):
        return super().get_context_data(
            intro_text=SiteConfiguration.get_solo().specialPublisDescr,
            is_year_view=False,
            list_title="Numéros spéciaux",
            **kwargs
        )


def latestPublication(req):
    """Redirects to the latest standard publication"""
    latestPubli = Publication.latest()
    return redirect(latestPubli.url)