# Copyright 2021 Max Planck Institute for Software Systems, and
# National University of Singapore
#
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# a copy of this software and associated documentation files (the
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# without limitation the rights to use, copy, modify, merge, publish,
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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import math
import random
import simbricks.experiments as exp
import simbricks.simulators as sim
import simbricks.proxy as proxy
import simbricks.nodeconfig as node

host_types = ['qemu', 'gem5', 'qt']
n_nets = [1, 2, 3, 4, 8, 16, 32]
n_hosts = [2, 10, 20, 30, 35, 40, 50, 60, 70, 80]
experiments = []
separate_net = True

nets_per_host = 2

def select_servers(i, j, racks, n, n_host):
    nc = int(n_host / 2)

    if n == 1:
        # only one network, just connect to all servers
        return racks[i][0]

    all_other_servers = []
    for k in range(0, n):
        if k == i:
            continue
        all_other_servers += racks[k][0]

    n_local = math.ceil(nc / 2)
    n_remote = math.floor(nc / 2)

    servers_local = random.sample(racks[i][0], k=n_local)
    servers_other = random.sample(all_other_servers, k=n_remote)
    return servers_local + servers_other

for host_type in host_types:
  for n in n_nets:
    for n_host in n_hosts:
        random.seed(n + 1000 * n_host)

        nh = math.ceil(n / nets_per_host)
        if separate_net:
            nh += 1

        e = exp.DistributedExperiment(f'dist_memcache-{host_type}-{n}-{n_host}', nh)

        # host
        if host_type == 'qemu':
            host_class = sim.QemuHost
        elif host_type == 'qt':
            def qemu_timing():
                h = sim.QemuHost()
                h.sync = True
                return h
            host_class = qemu_timing
        elif host_type == 'gem5':
            host_class = sim.Gem5Host
            e.checkpoint = False
        else:
            raise NameError(host_type)

        switch_top = sim.SwitchNet()
        switch_top.name = 'switch_top'
        if host_type == 'qemu':
            switch_top.sync = False
        e.add_network(switch_top)
        e.assign_sim_host(switch_top, 0)

        racks = []
        for i in range(0, n):
            h_i = int(i / nets_per_host)
            if separate_net:
                h_i += 1

            switch = sim.SwitchNet()
            switch.name = 'switch_%d' % (i,)
            if host_type == 'qemu':
                switch.sync = False
            e.add_network(switch)
            e.assign_sim_host(switch, h_i)

            switch_top.connect_network(switch)

            # create servers and clients
            m = int(n_host / 2)
            servers = sim.create_multinic_hosts(e, m, 'server_%d' % (i,),
                    switch, host_class, node.I40eLinuxNode,
                    node.MemcachedServer, ip_start = i * n_host + 1,
                    ip_prefix=16)
            for s in servers:
                e.assign_sim_host(s, h_i)
                e.assign_sim_host(s.nics[0].multinic, h_i)

            clients = sim.create_multinic_hosts(e, m, 'client_%d' % (i,),
                    switch, host_class, node.I40eLinuxNode,
                    node.MemcachedClient, ip_start = i * n_host + 1 + m,
                    ip_prefix=16)
            for c in clients:
                c.wait = True
                e.assign_sim_host(c, h_i)
                e.assign_sim_host(c.nics[0].multinic, h_i)

            racks.append((servers, clients))

            if h_i != 0:
                lp = proxy.SocketsNetProxyListener()
                lp.name = 'listener-%d' % (i,)
                e.add_proxy(lp)
                e.assign_sim_host(lp, h_i)

                cp = proxy.SocketsNetProxyConnecter(lp)
                cp.name = 'connecter-%d' % (i,)
                e.add_proxy(cp)
                e.assign_sim_host(cp, 0)

                lp.add_n2n(switch_top, switch)

            for c in clients + servers:
                c.nics[0].start_tick = 580000000000
                c.extra_deps.append(switch_top)

        all_servers = []
        for  (s,_) in racks:
            all_servers += s

        # set up client -> server connections
        for i in range(0, n):
            for j in range(0, int(n_host / 2)):
                c = racks[i][1][j]
                servers = select_servers(i, j, racks, n, n_host)
                server_ips = [s.node_config.ip for s in servers]

                c.node_config.app.server_ips = server_ips
                c.node_config.app.threads = len(server_ips)
                c.node_config.app.concurrency = len(server_ips)
                c.extra_deps += all_servers

        # add to experiments
        experiments.append(e)
