# Copyright (c) 2011 Advanced Micro Devices, Inc.
#               2011 Massachusetts Institute of Technology
# All rights reserved.
#
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# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# Authors: Brad Beckmann
#          Tushar Krishna

from __future__ import print_function
from __future__ import absolute_import

from m5.params import *
from m5.objects import *

from .BaseTopology import SimpleTopology

class Pt2Pt(SimpleTopology):
    description='Pt2Pt'

    def __init__(self, controllers):
        self.nodes = controllers

    def makeTopology(self, options, network, IntLink, ExtLink, Router):
        nodes = self.nodes

        # default values for link latency and router latency.
        # Can be over-ridden on a per link/router basis
        link_latency = options.link_latency # used by simple and garnet
        router_latency = options.router_latency # only used by garnet

        # Create an individual router for each controller,
        # and connect all to all.
        # Since this is a high-radix router, router_latency should
        # accordingly be set to a higher value than the default
        # (which is 1 for mesh routers)
        routers = [Router(router_id=i, latency = router_latency) \
            for i in range(len(nodes))]
        network.routers = routers

        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i],
                     latency = link_latency)
                    for (i, n) in enumerate(nodes)]
        network.ext_links = ext_links

        link_count = len(nodes)
        int_links = []
        for i in range(len(nodes)):
            for j in range(len(nodes)):
                if (i != j):
                    link_count += 1
                    int_links.append(IntLink(link_id=link_count,
                                             src_node=routers[i],
                                             dst_node=routers[j],
                                             latency = link_latency))

        network.int_links = int_links