"""passbook PolicyBinding administration"""
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.auth.mixins import (
    PermissionRequiredMixin as DjangoPermissionRequiredMixin,
)
from django.contrib.messages.views import SuccessMessageMixin
from django.db.models import QuerySet
from django.urls import reverse_lazy
from django.utils.translation import ugettext as _
from django.views.generic import ListView, UpdateView
from guardian.mixins import PermissionListMixin, PermissionRequiredMixin

from passbook.admin.views.utils import DeleteMessageView
from passbook.lib.views import CreateAssignPermView
from passbook.policies.forms import PolicyBindingForm
from passbook.policies.models import PolicyBinding, PolicyBindingModel


class PolicyBindingListView(LoginRequiredMixin, PermissionListMixin, ListView):
    """Show list of all policies"""

    model = PolicyBinding
    permission_required = "passbook_policies.view_policybinding"
    paginate_by = 10
    ordering = ["order", "target"]
    template_name = "administration/policy_binding/list.html"

    def get_queryset(self) -> QuerySet:
        # Since `select_subclasses` does not work with a foreign key, we have to do two queries here
        # First, get all pbm objects that have bindings attached
        objects = (
            PolicyBindingModel.objects.filter(policies__isnull=False)
            .select_subclasses()
            .select_related()
            .order_by("pk")
        )
        for pbm in objects:
            pbm.bindings = PolicyBinding.objects.filter(target__pk=pbm.pbm_uuid)
        return objects


class PolicyBindingCreateView(
    SuccessMessageMixin,
    LoginRequiredMixin,
    DjangoPermissionRequiredMixin,
    CreateAssignPermView,
):
    """Create new PolicyBinding"""

    model = PolicyBinding
    permission_required = "passbook_policies.add_policybinding"
    form_class = PolicyBindingForm

    template_name = "generic/create.html"
    success_url = reverse_lazy("passbook_admin:policies-bindings")
    success_message = _("Successfully created PolicyBinding")


class PolicyBindingUpdateView(
    SuccessMessageMixin, LoginRequiredMixin, PermissionRequiredMixin, UpdateView
):
    """Update policybinding"""

    model = PolicyBinding
    permission_required = "passbook_policies.change_policybinding"
    form_class = PolicyBindingForm

    template_name = "generic/update.html"
    success_url = reverse_lazy("passbook_admin:policies-bindings")
    success_message = _("Successfully updated PolicyBinding")


class PolicyBindingDeleteView(
    LoginRequiredMixin, PermissionRequiredMixin, DeleteMessageView
):
    """Delete policybinding"""

    model = PolicyBinding
    permission_required = "passbook_policies.delete_policybinding"

    template_name = "generic/delete.html"
    success_url = reverse_lazy("passbook_admin:policies-bindings")
    success_message = _("Successfully deleted PolicyBinding")