# -*- coding: utf-8 -*-
#!/usr/bin/env python
import json
import logging

from apps.web.core.exceptions import InvalidParameter

from apps.dispatch.common import get_result_topic, get_query_topic

logger = logging.getLogger(__name__)


class TopicCommand(object):

    def __init__(self, cmdNo, devNo, params=None, prefix=''):
        self.cmdNo = cmdNo
        self.devNo = devNo

        if params is None:
            self.params = {}

        elif isinstance(params, list):
            self.params = { _["name"] : {_["key"]: _["value"]} for _ in params }

        else:
            self.params = params

        self.prefix = prefix

    def __str__(self):
        return '{prefix}/{devNo}/{cmdNo}'.format(prefix = self.prefix,
                                                 devNo = self.devNo,
                                                 cmdNo = self.cmdNo)

    @property
    def result_topic(self):
        return get_result_topic(prefix=self.prefix, cmdNo=self.cmdNo, devNo=self.devNo)

    @property
    def query_topic(self):
        return get_query_topic(prefix=self.prefix, cmdNo=self.cmdNo, devNo=self.devNo)

    @property
    def query_payload(self):
        return json.dumps(self.params)

    @property
    def result_payload(self):
        try:
            payload = self.params
            payload['IMEI'] = self.devNo
            return payload
        except ValueError:
            raise InvalidParameter('params has to be json-like, params was = %s' % (self.params,))