"""
Copyright (c) 2015 SONATA-NFV and Paderborn University
ALL RIGHTS RESERVED.

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.

Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION]
nor the names of its contributors may be used to endorse or promote
products derived from this software without specific prior written
permission.

This work has been performed in the framework of the SONATA project,
funded by the European Commission under Grant number 671517 through
the Horizon 2020 and 5G-PPP programmes. The authors would like to
acknowledge the contributions of their colleagues of the SONATA
partner consortium (www.sonata-nfv.eu).
"""
"""
Distributed Cloud Emulator (dcemulator)
(c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
"""

import logging
import threading
import zerorpc

logging.basicConfig(level=logging.INFO)


class ZeroRpcApiEndpoint(object):
    """
    Simple API endpoint that offers a zerorpc-based
    interface. This interface will be used by the
    default command line client.
    It can be used as a reference to implement
    REST interfaces providing the same semantics,
    like e.g. OpenStack compute API.
    """

    def __init__(self, listenip, port):
        self.dcs = {}
        self.ip = listenip
        self.port = port
        logging.debug("Created API endpoint %s(%s:%d)" % (
            self.__class__.__name__, self.ip, self.port))

    def connectFog(self, dc):
        self.dcs[dc.label] = dc
        logging.info("Connected DC(%s) to API endpoint %s(%s:%d)" % (
            dc.label, self.__class__.__name__, self.ip, self.port))

    def start(self):
        thread = threading.Thread(target=self._api_server_thread, args=())
        thread.daemon = True
        thread.start()
        logging.debug("Started API endpoint %s(%s:%d)" % (
            self.__class__.__name__, self.ip, self.port))

    def _api_server_thread(self):
        s = zerorpc.Server(MultiDatacenterApi(self.dcs))
        s.bind("tcp://%s:%d" % (self.ip, self.port))
        s.run()


class MultiDatacenterApi(object):
    """
        Just pass through the corresponding request to the
        selected data center. Do not implement provisioning
        logic here because will will have multiple API
        endpoint implementations at the end.
    """

    def __init__(self, dcs):
        self.dcs = dcs

    def compute_action_start(self, dc_label, compute_name, image, network, command):
        """
        Start a new compute instance: A docker container (note: zerorpc does not support keyword arguments)
        :param dc_label: name of the DC
        :param compute_name: compute container name
        :param image: image name
        :param command: command to execute
        :param network: list of all interface of the vnf, with their parameters (id=id1,ip=x.x.x.x/x),...
        :return: networks list({"id":"input","ip": "10.0.0.254/8"}, {"id":"output","ip": "11.0.0.254/24"})
        """
        # TODO what to return UUID / given name / internal name ?
        logging.debug("RPC CALL: compute start")
        try:
            c = self.dcs.get(dc_label).startCompute(
                compute_name, image=image, command=command, network=network)
            #return str(c.name)
            # return docker inspect dict
            return c.getStatus()
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message

    def compute_action_stop(self, dc_label, compute_name):
        logging.debug("RPC CALL: compute stop")
        try:
            return self.dcs.get(dc_label).stopCompute(compute_name)
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message

    def compute_list(self, dc_label):
        logging.debug("RPC CALL: compute list")
        try:
            if dc_label is None:
                # return list with all compute nodes in all DCs
                all_containers = []
                for dc in self.dcs.itervalues():
                    all_containers += dc.listCompute()
                return [(c.name, c.getStatus())
                        for c in all_containers]
            else:
                # return list of compute nodes for specified DC
                return [(c.name, c.getStatus())
                        for c in self.dcs.get(dc_label).listCompute()]
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message

    def compute_status(self, dc_label, compute_name):
        logging.debug("RPC CALL: compute status")
        try:
            return self.dcs.get(
                dc_label).containers.get(compute_name).getStatus()
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message

    def datacenter_list(self):
        logging.debug("RPC CALL: datacenter list")
        try:
            return [d.getStatus() for d in self.dcs.itervalues()]
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message

    def datacenter_status(self, dc_label):
        logging.debug("RPC CALL: datacenter status")
        try:
                return self.dcs.get(dc_label).getStatus()
        except Exception as ex:
            logging.exception("RPC error.")
            return ex.message
