# Copyright 2021 Max Planck Institute for Software Systems, and
# National University of Singapore
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# 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.nodeconfig as node
import simbricks.simulators as sim
from simbricks.simulator_utils import create_multinic_hosts

import simbricks.experiments as exp
from simbricks import proxy

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 = 1


# pylint: disable=redefined-outer-name
def select_servers(i, 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':
                HostClass = sim.QemuHost
            elif host_type == 'qt':

                def qemu_timing():
                    h = sim.QemuHost()
                    h.sync = True
                    return h

                HostClass = qemu_timing
            elif host_type == 'gem5':
                HostClass = 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 = f'switch_{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 = create_multinic_hosts(
                    e,
                    m,
                    f'server_{i}',
                    switch,
                    HostClass,
                    node.I40eLinuxNode,
                    node.MemcachedServer,
                    ip_start=i * n_host + 1,
                    ip_prefix=16
                )
                for s in servers:
                    e.assign_sim_host(s, h_i)
                    s_multisubnic = next(
                        pcidev for pcidev in s.pcidevs
                        if isinstance(pcidev, sim.MultiSubNIC)
                    )
                    e.assign_sim_host(s_multisubnic.multinic, h_i)

                clients = create_multinic_hosts(
                    e,
                    m,
                    f'client_{i}',
                    switch,
                    HostClass,
                    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)
                    c_multisubnic = next(
                        pcidev for pcidev in c.pcidevs
                        if isinstance(pcidev, sim.MultiSubNIC)
                    )
                    e.assign_sim_host(c_multisubnic.multinic, h_i)

                racks.append((servers, clients))

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

                    cp = proxy.SocketsNetProxyConnecter(lp)
                    cp.name = f'connecter-{i}'
                    e.add_proxy(cp)
                    e.assign_sim_host(cp, 0)

                    lp.add_n2n(switch_top, switch)

                for c in clients + servers:
                    if host_type == 'qt':
                        c.pcidevs[0].start_tick = 580000000000
                    c.extra_deps.append(switch_top)

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

            # 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, 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

            for h in all_servers + all_clients:
                h.node_config.disk_image = 'memcached'

            # add to experiments
            experiments.append(e)