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from m5.objects import SimpleNetwork, Switch, SimpleExtLink, SimpleIntLink


class SimplePt2Pt(SimpleNetwork):
    """A simple point-to-point network. This doesn't not use garnet."""

    def __init__(self, ruby_system):
        super(SimplePt2Pt, self).__init__()
        self.netifs = []

        # TODO: These should be in a base class
        # https://gem5.atlassian.net/browse/GEM5-1039
        self.ruby_system = ruby_system

    def connectControllers(self, controllers):
        """Connect all of the controllers to routers and connec the routers
        together in a point-to-point network.
        """
        # Create one router/switch per controller in the system
        self.routers = [Switch(router_id=i) for i in range(len(controllers))]

        # Make a link from each controller to the router. The link goes
        # externally to the network.
        self.ext_links = [
            SimpleExtLink(link_id=i, ext_node=c, int_node=self.routers[i])
            for i, c in enumerate(controllers)
        ]

        # Make an "internal" link (internal to the network) between every pair
        # of routers.
        link_count = 0
        int_links = []
        for ri in self.routers:
            for rj in self.routers:
                if ri == rj:
                    continue  # Don't connect a router to itself!
                link_count += 1
                int_links.append(
                    SimpleIntLink(link_id=link_count, src_node=ri, dst_node=rj)
                )
        self.int_links = int_links
