#    Copyright 2012 OpenStack Foundation
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import jinja2

ENV = jinja2.Environment(loader=jinja2.ChoiceLoader([
    jinja2.FileSystemLoader("/etc/trove/templates"),
    jinja2.PackageLoader("trove", "templates")
]))


class SingleInstanceConfigTemplate(object):
    """ This class selects a single configuration file by database type for
    rendering on the guest """
    def __init__(self, service_type, flavor_dict):
        """ Constructor

        :param service_type: The database type.
        :type name: str.
        :param flavor_dict: dict containing flavor details for use in jinja.
        :type flavor_dict: dict.

        """
        self.flavor_dict = flavor_dict
        template_filename = "%s.config.template" % service_type
        self.template = ENV.get_template(template_filename)

    def render(self):
        """ Renders the jinja template

        :returns: str -- The rendered configuration file

        """
        self.config_contents = self.template.render(
            flavor=self.flavor_dict)
        return self.config_contents