# Copyright 2013 Rackspace Hosting
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from django.conf import settings
from django import template
from django.utils.translation import ugettext_lazy as _

from horizon import exceptions
from horizon import tabs
from openstack_dashboard.contrib.trove import api
from openstack_dashboard.contrib.trove.content.databases import tables


class OverviewTab(tabs.Tab):
    name = _("Overview")
    slug = "overview"

    def get_context_data(self, request):
        return {"instance": self.tab_group.kwargs['instance']}

    def get_template_name(self, request):
        instance = self.tab_group.kwargs['instance']
        template_file = ('project/databases/_detail_overview_%s.html'
                         % instance.datastore['type'])
        try:
            template.loader.get_template(template_file)
            return template_file
        except template.TemplateDoesNotExist:
            # This datastore type does not have a template file
            # Just use the base template file
            return ('project/databases/_detail_overview.html')


class UserTab(tabs.TableTab):
    table_classes = [tables.UsersTable]
    name = _("Users")
    slug = "users_tab"
    instance = None
    template_name = "horizon/common/_detail_table.html"
    preload = False

    def get_users_data(self):
        instance = self.tab_group.kwargs['instance']
        try:
            data = api.trove.users_list(self.request, instance.id)
            for user in data:
                user.instance = instance
                user.access = api.trove.user_list_access(self.request,
                                                         instance.id,
                                                         user.name)
        except Exception:
            msg = _('Unable to get user data.')
            exceptions.handle(self.request, msg)
            data = []
        return data

    def allowed(self, request):
        perms = getattr(settings, 'TROVE_ADD_USER_PERMS', [])
        if perms:
            return request.user.has_perms(perms)
        return True


class DatabaseTab(tabs.TableTab):
    table_classes = [tables.DatabaseTable]
    name = _("Databases")
    slug = "database_tab"
    instance = None
    template_name = "horizon/common/_detail_table.html"
    preload = False

    def get_databases_data(self):
        instance = self.tab_group.kwargs['instance']
        try:
            data = api.trove.database_list(self.request, instance.id)
            add_instance = lambda d: setattr(d, 'instance', instance)
            map(add_instance, data)
        except Exception:
            msg = _('Unable to get databases data.')
            exceptions.handle(self.request, msg)
            data = []
        return data

    def allowed(self, request):
        perms = getattr(settings, 'TROVE_ADD_DATABASE_PERMS', [])
        if perms:
            return request.user.has_perms(perms)
        return True


class BackupsTab(tabs.TableTab):
    table_classes = [tables.InstanceBackupsTable]
    name = _("Backups")
    slug = "backups_tab"
    instance = None
    template_name = "horizon/common/_detail_table.html"
    preload = False

    def get_backups_data(self):
        instance = self.tab_group.kwargs['instance']
        try:
            data = api.trove.instance_backups(self.request, instance.id)
        except Exception:
            msg = _('Unable to get database backup data.')
            exceptions.handle(self.request, msg)
            data = []
        return data

    def allowed(self, request):
        return request.user.has_perm('openstack.services.object-store')


class InstanceDetailTabs(tabs.TabGroup):
    slug = "instance_details"
    tabs = (OverviewTab, UserTab, DatabaseTab, BackupsTab)
    sticky = True
