{ pkgs, ... }:
let
  wifiIface = "wlp4s0";
  gwIface = "enp5s0";
  #gwIface = config.networking.defaultGateway.interface;
in
{
  environment.systemPackages = [
    pkgs.iw
  ];
  networking.interfaces.${wifiIface} = {
    ipv4.addresses = [{ address = "192.168.2.1"; prefixLength = 24; }];
  };
  # Not merged, even though all are 1
  #boot.kernel.sysctl."net.ipv4.ip_forward" = 1;
  boot.kernel.sysctl."net.ipv6.conf.${wifiIface}.addr_gen_mode" = 1;
  networking.nftables.ruleset = ''
    table inet filter {
      chain input-lan {
        meta l4proto { udp, tcp } th dport domain counter accept comment "DNS"
        tcp dport bootps counter accept comment "DHCP"
      }
      chain input {
        iifname ${wifiIface} goto input-lan
      }
      chain output-lan {
        counter accept
      }
      chain output {
        oifname ${wifiIface} goto output-lan
      }
      chain forward {
        iifname ${wifiIface} oifname ${gwIface} counter accept
        iifname ${gwIface} oifname ${wifiIface} counter accept
      }
    }
  '';

  services.unbound.settings = {
    server = {
      interface = [ "192.168.2.1" ];
      access-control = [ "192.168.2.0/24 allow" ];
      local-zone = [
        "tracking.intl.miui.com always_refuse"
        "sourcephile.fr typetransparent"
      ];
      local-data = [
        "\"bureau1.sourcephile.fr A 192.168.2.1\""
      ];
    };
  };

  networking.wlanInterfaces.${wifiIface} = {
    device = "phy0";
  };

  networking.networkmanager.unmanaged = [
    wifiIface
  ];

  # iw dev wlp4s0 station dump
  # DOC: https://w1.fi/cgit/hostap/plain/hostapd/hostapd.conf
  services.hostapd = {
    enable = true;
    logLevel = 2;
    interface = wifiIface;
    hwMode = "g";
    ssid = "bureau1";
    wpa = true;
    wpaPassphrase = "bidonpoissonmaisonronron";
    countryCode = "FR";
    extraConfig = ''
      # WLAN
      beacon_int=100
      dtim_period=2 # DTIM (delivery trafic information message)
      preamble=1
      # limit the frequencies used to those allowed in the country
      ieee80211d=1
      # 0 means the AP will search for the channel with the least interferences (ACS)
      channel=1

      # WPA2
      wpa_key_mgmt=WPA-PSK
      wpa_pairwise=CCMP
      rsn_pairwise=CCMP
      auth_algs=1 # 0=noauth, 1=wpa, 2=wep, 3=both
      macaddr_acl=0
      # QoS support, also required for full speed on 802.11n/ac/ax
      wmm_enabled=1
      eap_reauth_period=360000
      wpa_group_rekey=600
      wpa_ptk_rekey=600
      wpa_gmk_rekey=86400

      # N-WLAN
      ieee80211n=1
      # See Capabilities in iw list
      ht_capab=[HT40+][SHORT-GI-40][DSSS_CCK-40][MAX-AMSDU-7935]
      require_ht=1
      obss_interval=0

      # 802.11ac support
      ieee80211ac=0
    '';
  };
  systemd.services.dhcpd4 = {
    after = [ "network-addresses-${wifiIface}.service" ];
    requires = [
      "network-addresses-${wifiIface}.service"
      "sys-subsystem-net-devices-${wifiIface}.device"
    ];
    unitConfig.StartLimitIntervalSec = 0;
    serviceConfig.RestartSec = 5;
  };
  services.dhcpd4 = {
    enable = true;
    interfaces = [ wifiIface ];
    extraConfig = ''
      option subnet-mask 255.255.255.0;
      option broadcast-address 192.168.2.255;
      option routers 192.168.2.1;
      option domain-name-servers 192.168.2.1;
      subnet 192.168.2.0 netmask 255.255.255.0 {
        range 192.168.2.100 192.168.2.200;
      }
    '';
  };

  #networking.firewall.allowedUDPPorts = [ 53 67 ]; # DNS & DHCP
  /*
    # Sometimes slow connection speeds are attributed to absence of haveged.
    services.haveged.enable = true;
  */

  /*

    systemd.services.wifi-relay = let inherit (pkgs) iptables gnugrep;
    in {
    description = "iptables rules for wifi-relay";
    after = [ "dhcpd4.service" ];
    wantedBy = [ "multi-user.target" ];
    script = ''
    ${iptables}/bin/iptables -w -t nat -I POSTROUTING -s 192.168.2.0/24 ! -o wlan-ap0 -j MASQUERADE
    ${iptables}/bin/iptables -w -I FORWARD -i wlan-ap0 -s 192.168.2.0/24 -j ACCEPT
    ${iptables}/bin/iptables -w -I FORWARD -i wlan-station0 -d 192.168.2.0/24 -j ACCEPT
    '';
    };
  */
}