#
# 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/>.
#
"""
Views for BIND module.
"""

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

from plinth import actions
from plinth.views import AppView

from . import description, get_config, name, port_forwarding_info
from .forms import BindForm


class BindAppView(AppView):  # pylint: disable=too-many-ancestors
    """A specialized view for configuring Bind."""
    app_id = 'bind'
    diagnostics_module_name = 'bind'
    name = name
    description = description
    show_status_block = True
    form_class = BindForm
    port_forwarding_info = port_forwarding_info

    def get_initial(self):
        """Return the values to fill in the form."""
        initial = super().get_initial()
        initial.update(get_config())
        return initial

    def form_valid(self, form):
        """Change the configurations of Bind service."""
        data = form.cleaned_data
        old_config = get_config()

        if old_config['forwarders'] != data['forwarders'] \
           or old_config['enable_dnssec'] != data['enable_dnssec']:
            dnssec_setting = 'enable' if data['enable_dnssec'] else 'disable'
            actions.superuser_run('bind', [
                'configure', '--forwarders', data['forwarders'], '--dnssec',
                dnssec_setting
            ])
            messages.success(self.request, _('Configuration updated'))

        return super().form_valid(form)