#
# Copyright (c) 2014 ThoughtWorks, Inc.
#
# Pixelated 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.
#
# Pixelated 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 Pixelated. If not, see <http://www.gnu.org/licenses/>.

import json

from twisted.web.resource import Resource


class SetEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, set):
            return list(obj)
        return super(SetEncoder, self).default(obj)


def respond_json(entity, request, status_code=200):
    json_response = json.dumps(entity, cls=SetEncoder)
    request.responseHeaders.addRawHeader(b"content-type", b"application/json")
    request.code = status_code
    return json_response


def respond_json_deferred(entity, request, status_code=200):
    json_response = json.dumps(entity, cls=SetEncoder)
    request.responseHeaders.addRawHeader(b"content-type", b"application/json")
    request.code = status_code
    request.write(json_response)
    request.finish()


class BaseResource(Resource):

    def __init__(self, services_factory):
        Resource.__init__(self)
        self._services_factory = services_factory

    def keymanager(self, request):
        user_id = self._get_user_id_from_request()
        return self._services_factory.services(user_id).keymanager

    def _get_user_id_from_request(self):
        # currently we are faking this
        return self._services_factory._services_by_user.keys()[0]