from django.contrib.auth.mixins import LoginRequiredMixin
from django.http import Http404
from django.shortcuts import get_object_or_404
from django.views.generic import DetailView, ListView

from .markdown import render_markdown
from .models import AUDIENCES_BY_ROLE, GuidePage


class GuideAccessMixin:
    def get_allowed_audiences(self):
        user = self.request.user
        if user.is_superuser:
            return set(GuidePage.Audience.values)
        return AUDIENCES_BY_ROLE.get(getattr(user, "role", ""), set())

    def get_help_root(self):
        namespace = getattr(self.request.resolver_match, "namespace", None) or "portal"
        return f"/{namespace}/help/"


class GuideIndexView(LoginRequiredMixin, GuideAccessMixin, ListView):
    model = GuidePage
    context_object_name = "guides"

    def get_queryset(self):
        return GuidePage.objects.filter(audience__in=self.get_allowed_audiences())

    def get_context_data(self, **kwargs):
        ctx = super().get_context_data(**kwargs)
        ctx["help_root"] = self.get_help_root()
        return ctx


class GuideDetailView(LoginRequiredMixin, GuideAccessMixin, DetailView):
    model = GuidePage

    def get_object(self, queryset=None):
        path = f"user-guides/{self.kwargs['page_path']}"
        page = get_object_or_404(GuidePage, path=path)
        if page.audience not in self.get_allowed_audiences():
            raise Http404("This guide is not available to your role.")
        return page

    def get_context_data(self, **kwargs):
        ctx = super().get_context_data(**kwargs)
        help_root = self.get_help_root()
        ctx["help_root"] = help_root
        ctx["guide_html"] = render_markdown(self.object.content, self.object.path, help_root)
        ctx["guides"] = GuidePage.objects.filter(audience__in=self.get_allowed_audiences())
        return ctx