{ hostName, inputs, lib, ... }:

let
  hostConf = config.site.hosts.${hostName};

  pppoeInterfaces =
    lib.filterAttrs (_: { type, ... }: type == "pppoe")
      hostConf.interfaces;

  firstUpstreamInterface =
    if builtins.length (builtins.attrNames upstreamInterfaces) > 0
    then builtins.head (
      builtins.attrNames upstreamInterfaces
    )
    else null;

  inherit (inputs.zentralwerk-network-key.lib.pppoe.${hostName}) user password;
in lib.mkIf (pppoeInterfaces != {}) {
  boot.postBootCommands = ''
    if [ ! -c /dev/ppp ]; then
      mknod -m 666 /dev/ppp c 108 0
    fi
  '';

  environment.etc."ppp/pap-secrets".text = ''
    "${user}" * "${password}"
  '';
  services.pppd = {
    enable = true;
    peers = builtins.mapAttrs (ifName: { upstream, ... }: {
      enable = true;
      autostart = true;
      config = ''
        plugin rp-pppoe.so
        nic-${upstream.link}
        ifname ${ifName}
        # Login settings. (PAP)
        name "${user}"
        noauth
        hide-password
        # Connection settings.
        persist
        # Max connection attempts (0 = no limit)
        maxfail 0
        # Seconds between reconnection attempts
        holdoff 1
 
        # LCP settings.
        lcp-echo-interval 5
        lcp-echo-failure 6
        
        # PPPoE compliant settings.
        noaccomp
        default-asyncmap
        mtu 1492
        # IP settings.
        #noipdefault
        defaultroute
        +ipv6
        defaultroute6
        # Increase debugging level
        debug
      '';
    };
  };

}