{ pkgs, lib, config, hostName, ipv4, hosts, ... }:
with builtins;
let
  inherit (config) networking users;
  netIface       = "enp1s0";
  netIPv4        = ipv4;
  netIPv4Gateway = "80.67.180.134";
  #netIPv6        = "2001:912:400:104::35";
  #netIPv6Gateway = "2001:912:400:104::1";
  lanIface       = "enp2s0";
  lanIPv4        = "192.168.1.214";
  lanNet         = "192.168.1.0/24";
  lanIPv4Gateway = "192.168.1.1";
in
{
imports = [
  networking/nftables.nix
  networking/ssh.nix
  networking/wireguard.nix
];

/* WARNING: using ipconfig (the ip= kernel parameter) IS NOT RELIABLE:
   a 91.216.110.35/32 becomes a 91.216.110.35/8
boot.kernelParams = map
  (ip: "ip=${ip.clientIP}:${ip.serverIP}:${ip.gatewayIP}:${ip.netmask}:${ip.hostname}:${ip.device}:${ip.autoconf}")
  [ { clientIP = netIPv4; serverIP = "";
      gatewayIP = networking.defaultGateway.address;
      netmask = "255.255.255.255";
      hostname = ""; device = networking.defaultGateway.interface;
      autoconf = "off";
    }
    { clientIP = lanIPv4; serverIP = "";
      gatewayIP = "";
      netmask = "255.255.255.0";
      hostname = ""; device = "${lanIface}";
      autoconf = "off";
    }
  ];
*/
/* DIY network config, but a right one */
boot.initrd.preLVMCommands = ''
  set -x

  # IPv4 net
  ip link set ${netIface} up
  ip address add ${netIPv4}/32 dev ${netIface}
  ip route add ${netIPv4Gateway} dev ${netIface}
  ip route add default via ${netIPv4Gateway} dev ${netIface}

  # IPv4 lan
  ip link set ${lanIface} up
  ip address add ${lanIPv4}/32 dev ${lanIface}
  ip route add ${lanIPv4Gateway} dev ${lanIface}
  ip route add ${lanNet} dev ${lanIface} src ${lanIPv4} proto kernel
    # NOTE: ${lanIPv4}/24 would not work with initrd's ip, hence ${lanNet}

  # IPv6 net
  #ip -6 address add ''${netIPv6} dev ${netIface}
  #ip -6 route add ''${netIPv6Gateway} dev ${netIface}
  #ip -6 route add default via ''${netIPv6Gateway} dev ${netIface}

  ip -4 address
  ip -4 route
  #ip -6 address
  #ip -6 route

  set +x

  # Since boot.initrd.network's preLVMCommands won't set hasNetwork=1
  # we have to run the postCommands ourselves.
  ${config.boot.initrd.network.postCommands}
'';

# Workaround https://github.com/NixOS/nixpkgs/issues/56822
# TODO: the issue is now closed
#boot.initrd.kernelModules = [ "ipv6" ];

# Useless without an out-of-band access, and unsecure
# (though / may still be encrypted at this point).
# boot.kernelParams = [ "boot.shell_on_fail" ];

# Disable IPv6 entirely until it's available
boot.kernel.sysctl = {
  "net.ipv6.conf.${netIface}.disable_ipv6" = 1;
};

services.knot.extraConfig = lib.mkBefore ''
  server:
    listen: ${netIPv4}@53
    #listen: ::@53
'';

networking = {
  hostName = hostName;
  domain = "sourcephile.fr";

  useDHCP = false;
  defaultGateway = {
    address = netIPv4Gateway;
    interface = "${netIface}";
  };
  /*
  defaultGateway6 = {
    address = netIPv6Gateway;
    interface = "${netIface}";
  };
  */
  #nameservers = [ ];
  nftables.ruleset = lib.mkAfter ''
    table inet filter {
      chain input {
        iifname ${netIface} goto input-net
        iifname ${lanIface} goto input-lan
      }
      chain output {
        oifname ${netIface} jump output-net
        oifname ${netIface} log level warn prefix "output-net: " counter drop
        oifname ${lanIface} goto output-lan
      }
    }
  '';
  interfaces.${netIface} = {
    useDHCP = false;
    ipv4.addresses = [ { address = netIPv4; prefixLength = 32; } ];
    ipv4.routes    = [ { address = networking.defaultGateway.address; prefixLength = 32; } ];

    /*
    ipv6.addresses = [ { address = netIPv6; prefixLength = 64; }
                       { address = "fe80::1"; prefixLength = 10; }
                     ];
    ipv6.routes    = [ { address = networking.defaultGateway6.address; prefixLength = 64; } ];
    */
  };
  interfaces.${lanIface} = {
    useDHCP = false;
    ipv4.addresses = [ { address = lanIPv4; prefixLength = 24; } ];
    /*
    # FIXME: remove this /1 hack when the host will be racked at PTT
    ipv4.routes    = [ { address = "0.0.0.0";   prefixLength = 1; via = "192.168.1.1"; }
                       { address = "128.0.0.0"; prefixLength = 1; via = "192.168.1.1"; }
                       ];
    */
    /*
    ipv6.addresses = [ { address = "fe80::1"; prefixLength = 10; } ];
    ipv6.routes    = [ ];
    */
  };
  interfaces.enp3s0 = {
    useDHCP = false;
  };
};
}