#
# 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


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()