from core.topo import TopoParameter
from .multi_interface import MultiInterfaceTopo, MultiInterfaceConfig
import logging


class MultiInterfaceMultiClientTopo(MultiInterfaceTopo):
    NAME = "MultiIfMultiClient"

    def __init__(self, topo_builder, parameterFile):
        logging.info("Initializing MultiInterfaceMultiClientTopo...")

        super(MultiInterfaceMultiClientTopo, self).__init__(
            topo_builder, parameterFile)

        # For each client-router, add a client, a bottleneck link, and a server
        for bl in self.c2r_links:
            client = self.add_client()
            self.add_link(client, bl.get_left())

        self.add_server()

        # And connect the router to all servers
        for s in self.servers[1:]:
            self.add_link(self.router, s)

    def __str__(self):
        s = "Multiple interface topology with several clients and servers\n"
        i = 0
        nc = len(self.get_client_to_router_links())

        for i in range(0, nc):
            if i == nc // 2:
                s = s + "                 r--s\n"
                s = s + "c-\sw---bl---sw-/ \-s\n"
            elif i < nc // 2:
                s = s + "c-/sw---bl---sw-\ /-s\n"
            else:
                s = s + "c-\sw---bl---sw-/ \-s\n"

        return s


class MultiInterfaceMultiClientConfig(MultiInterfaceConfig):
    NAME = "MultiIfMultiClient"

    def __init__(self, topo, param):
        super(MultiInterfaceMultiClientConfig, self).__init__(topo, param)

    def configure_routing(self):
        super(MultiInterfaceMultiClientConfig, self).configure_routing()
        for i, _ in enumerate(self.topo.c2r_links):
            # Routing for the congestion client
            cmd = self.add_global_default_route_command(self.get_router_ip_to_client_switch(i),
                                                        self.get_client_interface(i+1, 0))
            self.topo.command_to(self.clients[i+1], cmd)

        for i, s in enumerate(self.topo.servers):
            # Routing for the congestion server
            cmd = self.add_simple_default_route_command(
                self.get_router_ip_to_server_switch(i))
            self.topo.command_to(s, cmd)

    def configure_interfaces(self):
        logging.info(
            "Configure interfaces using MultiInterfaceMultiClientConfig...")
        super(MultiInterfaceMultiClientConfig, self).configure_interfaces()
        self.clients = [self.topo.get_client(
            i) for i in range(0, self.topo.client_count())]
        self.servers = [self.topo.get_server(
            i) for i in range(0, self.topo.server_count())]
        netmask = "255.255.255.0"

        for i, _ in enumerate(self.topo.c2r_links):
            # Congestion client
            cmd = self.interface_up_command(self.get_client_interface(
                i + 1, 0), self.get_client_ip(i, congestion_client=True), netmask)
            self.topo.command_to(self.clients[i+1], cmd)
            client_interface_mac = self.clients[i+1].intf(
                self.get_client_interface(i + 1, 0)).MAC()
            self.topo.command_to(self.router, "arp -s {} {}".format(
                self.get_client_ip(i, congestion_client=True), client_interface_mac))

            router_interface_mac = self.router.intf(
                self.get_router_interface_to_client_switch(i)).MAC()
            # Congestion client
            self.topo.command_to(self.clients[i+1], "arp -s {} {}".format(
                self.get_router_ip_to_client_switch(i), router_interface_mac))

        for i, s in enumerate(self.servers):
            cmd = self.interface_up_command(self.get_router_interface_to_server_switch(i),
                                            self.get_router_ip_to_server_switch(i), netmask)
            self.topo.command_to(self.router, cmd)
            router_interface_mac = self.router.intf(
                self.get_router_interface_to_server_switch(i)).MAC()
            self.topo.command_to(s, "arp -s {} {}".format(
                self.get_router_ip_to_server_switch(i), router_interface_mac))
            cmd = self.interface_up_command(self.get_server_interface(
                i, 0), self.get_server_ip(interface_index=i), netmask)
            self.topo.command_to(s, cmd)
            server_interface_mac = s.intf(
                self.get_server_interface(i, 0)).MAC()
            self.topo.command_to(self.router, "arp -s {} {}".format(
                self.get_server_ip(interface_index=i), server_interface_mac))

    def get_client_ip(self, interface_index, congestion_client=False):
        return "{}{}.{}".format(self.param.get(TopoParameter.LEFT_SUBNET), interface_index, "10" if congestion_client else "1")

    def server_interface_count(self):
        return max(len(self.servers), 1)