# -*- coding: utf-8 -*-

# Copyright (c) 2015 Ericsson AB
#
# 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.

# Coders
import json_coder
import msgpack_coder
import cbor_coder
from calvin.utilities import calvinconfig

from calvin.utilities.calvinlogger import get_logger

_log = get_logger(__name__)
_conf = calvinconfig.get()

_coder_priority_list = None

def get_prio_list():
    global _coder_priority_list
    
    if not _coder_priority_list:
        _coder_priority_list = _conf.get("global", "static_coder") or ["json"]
        if "json" not in _coder_priority_list:
            _coder_priority_list.append("json")
        
    return _coder_priority_list

def get(t):
    
    if t == "cbor":
        return cbor_coder.MessageCoder()
        
    if t == "json":
        return json_coder.MessageCoder()

    if t == "msgpack":
        return msgpack_coder.MessageCoder()

    raise Exception("Coder {} requested is not supported".format(t))
