#
# This file is part of Plinth.
#
# 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/>.
#

"""
Django middleware to redirect to firstboot wizard if it has not be run
yet.
"""

from django.core.urlresolvers import reverse
from django.http.response import HttpResponseRedirect
import logging

from plinth import kvstore


LOGGER = logging.getLogger(__name__)


class FirstBootMiddleware(object):
    """Forward to firstboot page if firstboot isn't finished yet."""

    @staticmethod
    def process_request(request):
        """Handle a request as Django middleware request handler."""
        # Prevent redirecting to first boot wizard in a loop by
        # checking if we are already in first boot wizard.
        if request.path.startswith(reverse('first_boot:index')):
            return

        state = kvstore.get_default('firstboot_state', 0)
        if not state:
            # Permanent redirect causes the browser to cache the redirect,
            # preventing the user from navigating to /plinth until the
            # browser is restarted.
            return HttpResponseRedirect(reverse('first_boot:index'))

        if state < 5:
            LOGGER.info('First boot state - %d', state)
            return HttpResponseRedirect(reverse('first_boot:state%d' % state))