from __future__ import absolute_import

from django.shortcuts import render_to_response
from django.template import RequestContext
from django.utils.translation import ugettext_lazy as _
from django.shortcuts import get_object_or_404
from django.db.models.loading import get_model
from django.http import Http404
from django.core.exceptions import PermissionDenied

from permissions.models import Permission
from common.utils import encapsulate
from acls.models import AccessEntry

from .models import Node
from .permissions import PERMISSION_NODES_VIEW


def node_list(request):
    Permission.objects.check_permissions(request.user, [PERMISSION_NODES_VIEW])

    context = {
        'object_list': Node.objects.all(),
        'title': _(u'nodes'),
        'extra_columns_preffixed': [
            {
                'name': _(u'hostname'),
                'attribute': 'hostname',
            },
            {
                'name': _(u'cpu load'),
                'attribute': 'cpuload',
            },
            {
                'name': _(u'heartbeat'),
                'attribute': 'heartbeat',
            },
            {
                'name': _(u'memory usage'),
                'attribute': 'memory_usage',
            },

        ],
        'hide_object': True,
    }

    return render_to_response('generic_list.html', context,
        context_instance=RequestContext(request))


def node_workers(request, node_pk):
    node = get_object_or_404(Node, pk=node_pk)

    try:
        Permission.objects.check_permissions(request.user, [PERMISSION_NODES_VIEW])
    except PermissionDenied:
        AccessEntry.objects.check_access(PERMISSION_NODES_VIEW, request.user, node)

    context = {
        'object_list': node.workers.all(),
        'title': _(u'workers for node: %s') % node,
        'object': node,
        'hide_object': True,
    }

    return render_to_response('generic_list.html', context,
        context_instance=RequestContext(request))