"""passbook administration overview"""
from django.core.cache import cache
from django.shortcuts import redirect, reverse
from django.views.generic import TemplateView
from packaging.version import Version, parse
from requests import RequestException, get

from passbook import __version__
from passbook.admin.mixins import AdminRequiredMixin
from passbook.core.models import Application, Provider, Source, User
from passbook.flows.models import Flow, Stage
from passbook.policies.models import Policy
from passbook.root.celery import CELERY_APP
from passbook.stages.invitation.models import Invitation

VERSION_CACHE_KEY = "passbook_latest_version"


def latest_version() -> Version:
    """Get latest release from GitHub, cached"""
    if not cache.get(VERSION_CACHE_KEY):
        try:
            data = get(
                "https://api.github.com/repos/beryju/passbook/releases/latest"
            ).json()
            tag_name = data.get("tag_name")
            cache.set(VERSION_CACHE_KEY, tag_name.split("/")[1], 30)
        except (RequestException, IndexError):
            cache.set(VERSION_CACHE_KEY, "0.0.0", 30)
    return parse(cache.get(VERSION_CACHE_KEY))


class AdministrationOverviewView(AdminRequiredMixin, TemplateView):
    """Overview View"""

    template_name = "administration/overview.html"

    def post(self, *args, **kwargs):
        """Handle post (clear cache from modal)"""
        if "clear" in self.request.POST:
            cache.clear()
            return redirect(reverse("passbook_flows:default-authentication"))
        return self.get(*args, **kwargs)

    def get_context_data(self, **kwargs):
        kwargs["application_count"] = len(Application.objects.all())
        kwargs["policy_count"] = len(Policy.objects.all())
        kwargs["user_count"] = len(User.objects.all()) - 1  # Remove anonymous user
        kwargs["provider_count"] = len(Provider.objects.all())
        kwargs["source_count"] = len(Source.objects.all())
        kwargs["stage_count"] = len(Stage.objects.all())
        kwargs["flow_count"] = len(Flow.objects.all())
        kwargs["invitation_count"] = len(Invitation.objects.all())
        kwargs["version"] = parse(__version__)
        kwargs["version_latest"] = latest_version()
        kwargs["worker_count"] = len(CELERY_APP.control.ping(timeout=0.5))
        kwargs["providers_without_application"] = Provider.objects.filter(
            application=None
        )
        kwargs["policies_without_binding"] = len(
            Policy.objects.filter(bindings__isnull=True, promptstage__isnull=True)
        )
        kwargs["cached_policies"] = len(cache.keys("policy_*"))
        kwargs["cached_flows"] = len(cache.keys("flow_*"))
        return super().get_context_data(**kwargs)