#
# This file is part of FreedomBox.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
"""
FreedomBox app for configuring date and time.
"""

import logging

from django.contrib import messages
from django.utils.translation import ugettext as _

from plinth import actions
from plinth.modules import datetime
from plinth.views import AppView

from .forms import DateTimeForm

logger = logging.getLogger(__name__)


class DateTimeAppView(AppView):
    name = datetime.name
    description = datetime.description
    form_class = DateTimeForm
    app_id = 'datetime'
    diagnostics_module_name = 'datetime'
    manual_page = datetime.manual_page

    def get_initial(self):
        status = super().get_initial()
        status['time_zone'] = self.get_current_time_zone()
        return status

    def get_current_time_zone(self):
        """Get current time zone."""
        time_zone = open('/etc/timezone').read().rstrip()
        return time_zone or 'none'

    def form_valid(self, form):
        old_status = form.initial
        new_status = form.cleaned_data

        if old_status['time_zone'] != new_status['time_zone'] and \
           new_status['time_zone'] != 'none':
            try:
                actions.superuser_run('timezone-change',
                                      [new_status['time_zone']])
            except Exception as exception:
                messages.error(
                    self.request,
                    _('Error setting time zone: {exception}').format(
                        exception=exception))
            else:
                messages.success(self.request, _('Time zone set'))

        return super().form_valid(form)
