# Copyright 2012 Nebula, Inc.
#
#    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.utils.translation import ugettext_lazy as _

from horizon import exceptions
from horizon import tabs

from openstack_dashboard.api import cinder
from openstack_dashboard.dashboards.project.snapshots import tables
from openstack_dashboard.dashboards.project.volumes \
    import tables as vol_messages_tables


class OverviewTab(tabs.Tab):
    name = _("Overview")
    slug = "overview"
    template_name = ("project/volumes/_detail_overview.html")

    def get_context_data(self, request):
        volume = self.tab_group.kwargs['volume']
        return {
            'volume': volume,
            'group': volume.group,
            'detail_url': {
                'instance': 'horizon:project:instances:detail',
                'image': 'horizon:project:images:images:detail',
                'encryption': 'horizon:project:volumes:encryption_detail',
            }
        }


class SnapshotTab(tabs.TableTab):
    table_classes = (tables.VolumeDetailsSnapshotsTable,)
    name = _("Snapshots")
    slug = "snapshots_tab"
    template_name = "horizon/common/_detail_table.html"
    dashboard = 'project'
    preload = False

    def get_volume_snapshots_data(self):
        snapshots = self.tab_group.kwargs['snapshots']
        volume = self.tab_group.kwargs['volume']

        if volume is None:
            return snapshots

        needs_gs = any(getattr(snapshot, 'group_snapshot_id', None)
                       for snapshot in snapshots)
        if needs_gs:
            try:
                group_snapshots_list = cinder.group_snapshot_list(self.request)
                group_snapshots = dict((gs.id, gs) for gs
                                       in group_snapshots_list)
            except Exception:
                group_snapshots = {}
                exceptions.handle(self.request,
                                  _("Unable to retrieve group snapshots."))

        for snapshot in snapshots:
            snapshot._volume = volume
            if needs_gs:
                gs_id = snapshot.group_snapshot_id
                snapshot.group_snapshot = group_snapshots.get(gs_id)
            else:
                snapshot.group_snapshot = None

        return snapshots


class VolumeMessagesTab(tabs.TableTab):
    table_classes = (vol_messages_tables.VolumeMessagesTable,)
    name = _("Messages")
    slug = "messages_tab"
    template_name = ("horizon/common/_detail_table.html")
    preload = False

    def get_volume_messages_data(self):
        messages = []
        volume = self.tab_group.kwargs['volume'].id
        try:
            vol_msgs = cinder.message_list(self.request, search_opts={
                'resource_type': 'volume', 'resource_uuid': volume})
            for vol_msg in vol_msgs:
                messages.append(vol_msg)

        except Exception:
            exceptions.handle(self.request, _("Unable to retrieve "
                                              "volume messages."))
        return messages


class VolumeDetailTabs(tabs.DetailTabsGroup):
    slug = "volume_details"
    tabs = (OverviewTab, SnapshotTab, VolumeMessagesTab)
