from urllib.parse import quote as urlquote

from django.contrib.auth import logout as auth_logout
from django.contrib.auth.decorators import login_required
from django.http import HttpRequest
from django.http.response import Http404
from django.shortcuts import redirect, render
from django.urls import reverse


def login(request: HttpRequest):
    if request.user.is_authenticated:
        return redirect("homepage")

    match request.method:
        case "GET":
            data = request.GET
        case "POST":
            data = request.POST
        case _:
            raise Http404

    next = data.get("next")

    if next is not None:
        context = {
            "pass_url": "{}?next={}".format(
                reverse("password_login"), urlquote(next, safe="")
            ),
            "cas_url": "{}?next={}".format(
                reverse("cas_ng_login"), urlquote(next, safe="")
            ),
        }
    else:
        context = {
            "pass_url": reverse("password_login"),
            "cas_url": reverse("cas_ng_login"),
        }

    return render(request, "mainsite/login.html", context=context)


@login_required
def logout(request: HttpRequest):
    if request.session["_auth_user_backend"] != "django_cas_ng.backends.CASBackend":
        auth_logout(request)
        return redirect("homepage")

    return redirect("cas_ng_logout")