# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# CIRCLE is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE.  If not, see <http://www.gnu.org/licenses/>.
from __future__ import unicode_literals, absolute_import

import logging

from django.core.cache import get_cache
from django.conf import settings
from django.contrib.auth.models import Group
from django.views.generic import TemplateView

from braces.views import LoginRequiredMixin

from dashboard.models import GroupProfile
from vm.models import Instance, Node, InstanceTemplate

from ..store_api import Store

logger = logging.getLogger(__name__)


class IndexView(LoginRequiredMixin, TemplateView):
    template_name = "dashboard/index.html"

    def get_context_data(self, **kwargs):
        user = self.request.user
        context = super(IndexView, self).get_context_data(**kwargs)

        # instances
        favs = Instance.objects.filter(favourite__user=self.request.user)
        instances = Instance.get_objects_with_level(
            'user', user, disregard_superuser=True).filter(destroyed_at=None)
        display = list(favs) + list(set(instances) - set(favs))
        for d in display:
            d.fav = True if d in favs else False
        context.update({
            'instances': display[:5],
            'more_instances': instances.count() - len(instances[:5])
        })

        running = instances.filter(status='RUNNING')
        stopped = instances.exclude(status__in=('RUNNING', 'NOSTATE'))

        context.update({
            'running_vms': running[:20],
            'running_vm_num': running.count(),
            'stopped_vm_num': stopped.count()
        })

        # nodes
        if user.is_superuser:
            nodes = Node.objects.all()
            context.update({
                'nodes': nodes[:5],
                'more_nodes': nodes.count() - len(nodes[:5]),
                'sum_node_num': nodes.count(),
                'node_num': {
                    'running': Node.get_state_count(True, True),
                    'missing': Node.get_state_count(False, True),
                    'disabled': Node.get_state_count(True, False),
                    'offline': Node.get_state_count(False, False)
                }
            })

        # groups
        if user.has_module_perms('auth'):
            profiles = GroupProfile.get_objects_with_level('operator', user)
            groups = Group.objects.filter(groupprofile__in=profiles)
            context.update({
                'groups': groups[:5],
                'more_groups': groups.count() - len(groups[:5]),
            })

        # template
        if user.has_perm('vm.create_template'):
            context['templates'] = InstanceTemplate.get_objects_with_level(
                'operator', user, disregard_superuser=True).all()[:5]

        # toplist
        if settings.STORE_URL:
            cache_key = "files-%d" % self.request.user.pk
            cache = get_cache("default")
            files = cache.get(cache_key)
            if not files:
                try:
                    store = Store(self.request.user)
                    toplist = store.toplist()
                    quota = store.get_quota()
                    files = {'toplist': toplist, 'quota': quota}
                except Exception:
                    logger.exception("Unable to get tolist for %s",
                                     unicode(self.request.user))
                    files = {'toplist': []}
                cache.set(cache_key, files, 300)

            context['files'] = files
        else:
            context['no_store'] = True

        return context


class HelpView(TemplateView):

    def get_context_data(self, *args, **kwargs):
        ctx = super(HelpView, self).get_context_data(*args, **kwargs)
        ctx.update({"saml": hasattr(settings, "SAML_CONFIG"),
                    "store": settings.STORE_URL})
        return ctx