"""
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).
"""

import argparse
import pprint
from tabulate import tabulate
import zerorpc


pp = pprint.PrettyPrinter(indent=4)


class ZeroRpcClient(object):

    def __init__(self):
        self.c = zerorpc.Client(heartbeat=None, timeout=120) #heartbeat=None, timeout=120
        self.c.connect("tcp://127.0.0.1:4242")  # TODO hard coded for now. we'll change this later
        self.cmds = {}

    def execute_command(self, args):
        if getattr(self, args["command"]) is not None:
            # call the local method with the same name as the command arg
            getattr(self, args["command"])(args)
        else:
            print("Command not implemented.")

    def start(self, args):
        nw_list = list()
        if args.get("network") is not None:
            nw_list = self._parse_network(args.get("network"))
        r = self.c.compute_action_start(
            args.get("datacenter"),
            args.get("name"),
            args.get("image"),
            nw_list,
            args.get("docker_command")
            )
        pp.pprint(r)

    def stop(self, args):
        r = self.c.compute_action_stop(
            args.get("datacenter"), args.get("name"))
        pp.pprint(r)

    def list(self, args):
        r = self.c.compute_list(
            args.get("datacenter"))
        table = []
        for c in r:
            # for each container add a line to the output table
            if len(c) > 1:
                name = c[0]
                status = c[1]
                eth0ip = None
                eth0status = "down"
                if len(status.get("network")) > 0:
                    eth0ip = status.get("network")[0].get("ip")
                    eth0status = "up" if status.get(
                        "network")[0].get("up") else "down"
                table.append([status.get("datacenter"),
                              name,
                              status.get("image"),
                              eth0ip,
                              eth0status,
                              status.get("state").get("Status")])
        headers = ["Datacenter",
                   "Container",
                   "Image",
                   "eth0 IP",
                   "eth0 status",
                   "Status"]
        print(tabulate(table, headers=headers, tablefmt="grid"))

    def status(self, args):
        r = self.c.compute_status(
            args.get("datacenter"), args.get("name"))
        pp.pprint(r)

    def _create_dict(self, **kwargs):
        return kwargs

    def _parse_network(self, network_str):
        '''
        parse the options for all network interfaces of the vnf
        :param network_str: (id=x,ip=x.x.x.x/x), ...
        :return: list of dicts [{"id":x,"ip":"x.x.x.x/x"}, ...]
        '''
        nw_list = list()
        networks = network_str[1:-1].split('),(')
        for nw in networks:
            nw_dict = dict(tuple(e.split('=')) for e in nw.split(','))
            nw_list.append(nw_dict)

        return nw_list


parser = argparse.ArgumentParser(description='son-emu compute')
parser.add_argument(
    "command",
    choices=['start', 'stop', 'list', 'status'],
    help="Action to be executed.")
parser.add_argument(
    "--datacenter", "-d", dest="datacenter",
    help="Data center to in which the compute instance should be executed")
parser.add_argument(
    "--name", "-n", dest="name",
    help="Name of compute instance e.g. 'vnf1'")
parser.add_argument(
    "--image","-i", dest="image",
    help="Name of container image to be used e.g. 'ubuntu:trusty'")
parser.add_argument(
    "--dcmd", "-c", dest="docker_command",
    help="Startup command of the container e.g. './start.sh'")
parser.add_argument(
    "--net", dest="network",
    help="Network properties of a compute instance e.g. \
          '(id=input,ip=10.0.10.3/24),(id=output,ip=10.0.10.4/24)' for multiple interfaces.")

def main(argv):
    args = vars(parser.parse_args(argv))
    c = ZeroRpcClient()
    c.execute_command(args)