#!/usr/bin/env python

from mininet.net import Mininet
from mininet.node import UserSwitch, DefaultController, RemoteController, Host
from mininet.topo import Topo
from mininet.log import setLogLevel, info
from mininet.cli import CLI
from mininet.link import OVSIntf

from opticalUtils import LINCSwitch, LINCLink

class Domain(object):
    """
    A container for switch, host, link, and controller information to be dumped
    into the Mininet mid-level API.
    """

    def __init__ (self, did=0):
        # each Domain has a numeric ID for sanity/convenience
        self.__dId = did

        # information about network elements - for calling the "mid-level" APIs
        self.__ctrls = {}
        self.__switches = {}
        self.__hosts = {}
        self.__links = {}
        # maps of devices, hosts, and controller names to actual objects
        self.__smap = {}
        self.__hmap = {}
        self.__cmap = {}

    def addController(self, name, **args):
        self.__ctrls[name] = args if args else {}
        return name

    def addSwitch(self, name, **args):
        self.__switches[name] = args if args else {}
        return name

    def addHost(self, name, **args):
        self.__hosts[name] = args if args else {}
        return name

    def addLink(self, src, dst, **args):
        self.__links[(src, dst)] = args if args else {}
        return (src, dst)

    def getId( self):
        return self.__dId

    def getControllers(self, name=None):
        return self.__cmap.values() if not name else self.__cmap.get(name)

    def getSwitches(self, name=None):
        return self.__smap.values() if not name else self.__smap.get(name)

    def getHosts(self, name=None):
        return self.__hmap.values() if not name else self.__hmap.get(name)

    def injectInto(self, net):
        """ Adds available topology info to a supplied Mininet object. """
        # add switches, hosts, then links to mininet object
        for sw, args in self.__switches.iteritems():
            self.__smap[sw] = net.addSwitch(sw, **args)
        for h, args in self.__hosts.iteritems():
            self.__hmap[h] = net.addHost(h, **args)
        for l, args in self.__links.iteritems():
            src = self.__smap.get(l[0])
            dst = self.__smap.get(l[1])
            net.addLink(src if src else self.__hmap.get(l[0]),
                         dst if dst else self.__hmap.get(l[1]), **args)
        # then controllers
        for c, args in self.__ctrls.iteritems():
            self.__cmap[c] = net.addController(c, **args)

    def start(self):
        """ starts the switches with the correct controller. """
        map(lambda c: c.start(), self.__cmap.values())
        map(lambda s: s.start(self.__cmap.values()), self.__smap.values())

    def build(self, *args):
        """ override for custom topology, similar to Topo """
        pass


class OpticalDomain(Domain):
    """ An emulated optical metro core. It is Domain 0. """
    def build(self):
        for i in range (1,4):
            oean = { "optical.regens": 0 }
            self.addSwitch('OE%s' % i, dpid='0000ffffffffff0%s' % i, annotations=oean, cls=LINCSwitch)

        an = { "durable": "true" }
        self.addLink('OE1', 'OE2', port1=50, port2=30, annotations=an, cls=LINCLink)
        self.addLink('OE2', 'OE3', port1=50, port2=30, annotations=an, cls=LINCLink)
        self.addLink('OE3', 'OE1', port1=50, port2=30, annotations=an, cls=LINCLink)

class FabricDomain(Domain):
    """
    An emulated CO fabric, which is basically a K(n,m) bipartite graph.

    Each FabricDomain should be given a unique Domain ID (did) to ensure unique
    names and addressing.
    """
    def __init__(self, did):
        Domain.__init__(self, did)

    def build(self, n=2, m=3, f=2):
        # K(n,m) in bipartite graph
        l_nsw=[]
        l_msw=[]

        # create n spine switches
        for sw in range(n):
            l_nsw.append(self.addSwitch('swn%s%s' % (self.getId(), sw+1), cls=UserSwitch))

        # create connection point to optical core (a leaf switch)
        tsw = self.addSwitch('swm%s01' % self.getId(), cls=UserSwitch)
        self.addTether(tsw, 'sw000%s' % self.getId(), '0000ffffffff000%s' % self.getId())
        l_msw.append(tsw)

        # attach f hosts to last m-1 leaves
        for sw in range(1, m):
            msw = self.addSwitch('swm%s0%s' % (self.getId(), sw+1), cls=UserSwitch)
            l_msw.append(msw)
            for h in range(f):
                host = self.addHost('h%s%s' % (self.getId(), sw * f+h+1), cls=IpHost,
                                    ip='10.0.%s.%s/24' % ((self.getId()+sw+1), (f+1)),
                                    gateway='10.0.%s.254' % (self.getId()+sw+1))
                self.addLink(host, msw)
        # link up spines and leaves
        for nsw in l_nsw:
            for msw in l_msw:
                self.addLink(nsw, msw)

    def addTether(self, name, tname, tdpid):
        """
        add an OVS with name 'tname' and dpid 'tdpid' for connecting fabric
        domains to the core.  name: the UserSwitch to connect the OVS to.
        """
        self.__tether = self.addSwitch(tname, dpid=tdpid)
        self.addLink(tname, name, port1=1)

    def getTether(self):
        """ get connection point of this fabric to the core """
        return self.__tether


class IpHost(Host):
    def __init__(self, name, gateway, *args, **kwargs):
        super(IpHost, self).__init__(name, *args, **kwargs)
        self.gateway = gateway

    def config(self, **kwargs):
        Host.config(self, **kwargs)
        mtu = "ifconfig "+self.name+"-eth0 mtu 1490"
        self.cmd(mtu)
        self.cmd('ip route add default via %s' % self.gateway)

# fixed port numbers for attachment points (APs) between CORD and metro domains
OVS_AP=2
OE_AP=10

def setup(argv):
    domains = []
    ctlsets = sys.argv[1:]

    # the controllers for the optical domain
    d0 = OpticalDomain()
    domains.append(d0)
    ctls = ctlsets[0].split(',')
    for i in range (len(ctls)):
        d0.addController('c0%s' % i, controller=RemoteController, ip=ctls[i])

    # the fabric domains - position 1 for domain 1, 2 for 2 ...
    for i in range (1,len(ctlsets)):
        f = FabricDomain(i)
        domains.append(f)
        ctls = ctlsets[i].split(',')
        for j in range (len(ctls)):
            f.addController('c%s%s' % (i,j), controller=RemoteController, ip=ctls[j])

    # make/setup Mininet object
    net = Mininet()
    for d in domains:
        d.build()
        d.injectInto(net)

    # connect COs to core - sort of hard-wired at this moment
    for i in range(1,len(domains)):
        an = { "bandwidth": 100000, "durable": "true" }
        net.addLink(domains[i].getTether(), d0.getSwitches('OE%s' % i),
                    port1=OVS_AP, port2=OE_AP, speed=10000, annotations=an, cls=LINCLink)

    # fire everything up
    net.build()
    map(lambda x: x.start(), domains)

    # create a minimal copy of the network for configuring LINC.
    cfgnet = Mininet()
    cfgnet.switches = net.switches
    cfgnet.links = net.links
    cfgnet.controllers = d0.getControllers()
    LINCSwitch.bootOE(cfgnet, d0.getSwitches())

    CLI(net)
    net.stop()
    LINCSwitch.shutdownOE()

if __name__ == '__main__':
    setLogLevel('info')
    import sys
    if len(sys.argv) < 5:
        print ("Usage: sudo -E ./metro.py ctl-set1 ... ctl-set4\n\n",
                "Where ctl-set are comma-separated controller IP's")
    else:
        setup(sys.argv)