# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
#
# Copyright (C) 2015-2017, The University of Memphis,
#                          Arizona Board of Regents,
#                          Regents of the University of California.
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# See AUTHORS.md for a complete list of Mini-NDN authors and contributors.
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# permission notice:
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#   Mininet 2.3.0d1 License
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#   Copyright (c) 2013-2016 Open Networking Laboratory
#   Copyright (c) 2009-2012 Bob Lantz and The Board of Trustees of
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#   Original authors: Bob Lantz and Brandon Heller
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from mininet.node import CPULimitedHost, Host, Node
from mininet.examples.cluster import RemoteMixin

from ndn.nfd import Nfd

class NdnHostCommon():
    "Common methods of NdnHost and CpuLimitedNdnHost"

    def configNdn(self):
        self.buildPeerIp()

    def buildPeerIp(self):
        for iface in self.intfList():
            link = iface.link
            if link:
                node1, node2 = link.intf1.node, link.intf2.node
                if node1 == self:
                    self.peerList[node2.name] = link.intf2.node.IP(link.intf2)
                else:
                    self.peerList[node1.name] = link.intf1.node.IP(link.intf1)

    inited = False

    @classmethod
    def init(cls):
        "Initialization for NDNHost class"
        cls.inited = True

class NdnHost(Host, NdnHostCommon):
    "NDNHost is a Host that always runs NFD"

    def __init__(self, name, **kwargs):

        Host.__init__(self, name, **kwargs)
        if not NdnHost.inited:
            NdnHostCommon.init()

        # Create home directory for a node
        self.homeFolder = "%s/%s" % (self.params['workdir'], self.name)
        self.cmd("mkdir -p %s" % self.homeFolder)
        self.cmd("cd %s" % self.homeFolder)

        self.nfd = Nfd(self)
        self.nfd.start()

        self.peerList = {}

    def config(self, app=None, cache=None, **params):

        r = Node.config(self, **params)

        self.setParam(r, 'app', app=app)
        self.setParam(r, 'cache', cache=cache)

        return r

    def terminate(self):
        "Stop node."
        self.nfd.stop()
        Host.terminate(self)

class CpuLimitedNdnHost(CPULimitedHost, NdnHostCommon):
    '''CPULimitedNDNHost is a Host that always runs NFD and extends CPULimitedHost.
       It should be used when one wants to limit the resources of NDN routers and hosts '''

    def __init__(self, name, sched='cfs', **kwargs):

        CPULimitedHost.__init__(self, name, sched, **kwargs)
        if not NdnHost.inited:
            NdnHostCommon.init()

        # Create home directory for a node
        self.homeFolder = "%s/%s" % (self.params['workdir'], self.name)
        self.cmd("mkdir -p %s" % self.homeFolder)
        self.cmd("cd %s" % self.homeFolder)

        self.nfd = Nfd(self)
        self.nfd.start()

        self.peerList = {}

    def config(self, app=None, cpu=None, cores=None, cache=None, **params):

        r = CPULimitedHost.config(self,cpu,cores, **params)

        self.setParam(r, 'app', app=app)
        self.setParam(r, 'cache', cache=cache)

        return r

    def terminate(self):
        "Stop node."
        self.nfd.stop()
        Host.terminate(self)

class RemoteNdnHost(RemoteMixin, NdnHost):
    "A node on a remote server"
    pass