# 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.core.urlresolvers import reverse
from django.utils import safestring
from django.utils.translation import ugettext_lazy as _
from horizon import tables
from horizon.utils import functions as utils
from horizon_web_ui.freezer_ui.django_utils import timestamp_to_string


class Restore(tables.LinkAction):
    name = "restore"
    verbose_name = _("Restore")
    classes = ("ajax-modal", "btn-launch")
    ajax = True

    def get_link_url(self, datum=None):
        return reverse("horizon:freezer_ui:backups:restore",
                       kwargs={'backup_id': datum.id})

    def allowed(self, request, instance):
        return True  # is_loaded(instance)


class BackupFilter(tables.FilterAction):
    filter_type = "server"
    filter_choices = (("before", "Created before", True),
                      ("after", "Created after", True),
                      ("between", "Created between", True),
                      ("contains", "Contains text", True))


def icons(backup):
    result = []

    placeholder = '<i class="fa fa-fw"></i>'

    level_txt = "Level: {} ({} backup) out of {}".format(
        backup.level, "Full" if backup.level == 0 else "Incremental",
        backup.max_level)
    result.append(
        '<i class="fa fa-fw fa-custom-number" title="{}">{}</i>'.format(
            level_txt, backup.level))

    if backup.encrypted:
        result.append(
            '<i class="fa fa-lock fa-fw" title="Backup is encrypted"></i>')
    else:
        result.append(placeholder)

    if int(backup.total_broken_links) > 0:
        result.append(
            '<i class="fa fa-chain-broken fa-fw" title="There are {} broken '
            'links in this backup"></i>'.format(backup.total_broken_links))
    else:
        result.append(placeholder)

    if backup.excluded_files:
        result.append(
            '<i class="fa fa-minus-square fa-fw" title="{} files have been exc'
            'luded from this backup"></i>'.format(len(backup.excluded_files)))
    else:
        result.append(placeholder)

    return safestring.mark_safe("".join(result))


def backup_detail_view(backup):
    return reverse("horizon:freezer_ui:backups:detail", args=[backup.id])


class BackupsTable(tables.DataTable):
    backup_name = tables.Column('backup_name', verbose_name=_("Backup Name"),
                                link=backup_detail_view)
    host_name = tables.Column('host_name', verbose_name=_("Host Name"))
    created_by = tables.Column("user_name", verbose_name=_("Created By"))
    created = tables.Column("timestamp",
                            verbose_name=_("Created At"),
                            filters=[timestamp_to_string])
    icons = tables.Column(icons, verbose_name='Info')

    def __init__(self, *args, **kwargs):
        super(BackupsTable, self).__init__(*args,  **kwargs)

        if 'offset' in self.request.GET:
            self.offset = self.request.GET['offset']
        else:
            self.offset = 0

    def get_object_id(self, backup):
        return backup.id

    def get_pagination_string(self):
        page_size = utils.get_page_size(self.request)
        return "=".join(['offset', str(self.offset + page_size)])

    class Meta(object):
        name = "vms"
        verbose_name = _("Backups")
        row_actions = (Restore,)
        table_actions = (BackupFilter, )
        multi_select = False