{ config, lib, pkgs, ... }:
let
  wan-dev = "eno1";
  lan-dev = "eno2";
  mullvadPort = config.orbekk.mullvad.listenPort;
  mullvadMark = 30;
in
{
  orbekk.mullvad.enable = true;

  networking.networkmanager.enable = lib.mkForce false;

  networking.nameservers = [ "8.8.8.8" ];

  networking.vlans = builtins.listToAttrs (map (id: { name = "${lan-dev}.${toString id}"; value = { inherit id; interface = lan-dev; }; } ) [30 100 255]);

  systemd.services.update-dynamic-dns = {
    description = "Update dynamic dns records";
    path = with pkgs; [bash dnsutils nettools gawk iproute];
    startLimitIntervalSec = 5;
    script = toString ../tools/update-dns.sh;
  };

  networking.dhcpcd.runHook = ''
    systemctl restart update-dynamic-dns.service
  '';

  networking.firewall = {
    enable = lib.mkForce false;
    allowedTCPPorts = lib.mkForce [ ];
    allowedUDPPorts = lib.mkForce [ ];
    allowPing = true;
    logRefusedConnections = false;
    checkReversePath = false;
  };

  services.ddclient = {
    enable = true;
    configFile = "/opt/secret/he-ddclient.conf";
  };

  services.ferm = {
    enable = true;
    config = ''
      @def $DEV_UNTRUSTED_LAN = (${lan-dev}.30);
      @def $DEV_LAN = (${lan-dev}.100 ${lan-dev}.255);
      @def $DEV_WAN = (${wan-dev} he0 mullvad);
      @def $NET_LAN = 10.0.0.0/8;

      domain (ip ip6) table filter {
        chain INPUT {
          policy DROP;

          mod state state INVALID DROP;
          mod state state (ESTABLISHED RELATED) ACCEPT;

          interface lo ACCEPT;
          proto icmp ACCEPT;

          proto (udp udp) dport dhcpv6-client ACCEPT;

          proto 41 ACCEPT;  # IPv6 sit tunnel

          interface ($DEV_WAN $DEV_UNTRUSTED_LAN) @subchain "wan_services" {
            proto (tcp udp) dport (bootpc bootps) ACCEPT;
            proto tcp dport ssh ACCEPT;
            proto (tcp udp) dport domain ACCEPT;
            proto tcp dport (http https) ACCEPT;
            proto udp dport ${toString mullvadPort} ACCEPT;
          }

          interface $DEV_LAN @subchain "lan_services" {
            proto (tcp udp) dport (ssh domain bootpc bootps) ACCEPT;
            proto tcp dport (http https) ACCEPT;

            # RTMP streaming
            proto (tcp udp) dport 1935 ACCEPT;

            # Chromecast
            # proto udp dport 32768:61000 ACCEPT;
            # proto udp dport (5353 1900) ACCEPT;
            # proto tcp dport (8008 8009) ACCEPT;

            # chain logdrop {
            #   LOG log-level warning log-prefix "dropped-lan ";
            #   DROP;
            # }
            # jump logdrop;
          }
        }

        chain OUTPUT policy ACCEPT;

        chain FORWARD {
          policy DROP;

          mod state state INVALID DROP;
          mod state state (ESTABLISHED RELATED) ACCEPT;

          interface $DEV_UNTRUSTED_LAN outerface mullvad ACCEPT;
          interface $DEV_LAN ACCEPT;
        }
      }

      domain ip6 table filter chain INPUT {
        proto ipv6-icmp ACCEPT;
      }

      domain (ip ip6) table filter chain logdrop {
        LOG log-level warning log-prefix "dropped "; 
        DROP;
      }

      domain (ip ip6) table filter chain INPUT {
        interface $DEV_WAN DROP;
        jump logdrop;
      }

      domain ip table nat {
        chain POSTROUTING {
          saddr $NET_LAN outerface $DEV_WAN MASQUERADE;
        }
      }

      domain (ip ip6) table mangle {
        chain PREROUTING {
          interface ${lan-dev}.30 MARK set-mark ${toString mullvadMark};
        }
      }
    '';
  };

  services = {
    openssh.enable = lib.mkDefault true;
    openssh.passwordAuthentication = false;
  };

  boot.kernel.sysctl = {
    "net.ipv4.conf.all.forwarding" = true;
    "net.ipv4.conf.default.forwarding" = true;
    "net.ipv6.conf.all.forwarding" = true;
    "net.ipv6.conf.default.forwarding" = true;
  };

  #services.hostapd = {
  #  enable = true;
  #  # driver = "iwlwifi";
  #  ssid = "2c";
  #  wpaPassphrase = "mintchip";
  #  interface = "${lan-dev}";
  #  hwMode = "g";
  #  channel = 11;
  #  extraConfig = ''
  #    country_code=US
  #    wpa_key_mgmt=WPA-PSK  
  #    rsn_pairwise=CCMP
  #  '';
  #};

  networking.dhcpcd = {
    # Wain for v4 and v6 addresses.
    # wait = "both";
    extraConfig = ''
      debug
      noipv6rs
      interface ${wan-dev}
        dhcp
        ipv6rs
        ia_na 0
        # ia_pd 1/::/64 ${lan-dev}.100/0/64
    '';
  };
  systemd.services.dhcpcd.preStart = lib.mkAfter ''
    ${pkgs.iproute}/bin/ip link set dev ${wan-dev} address ${config.networking.interfaces.${wan-dev}.macAddress};
  '';

  services.dnsmasq = {
    enable = true;
    servers = [ "1.1.1.1" "8.8.8.8" "8.8.4.4" ];
    extraConfig = ''
      port=0
      dhcp-authoritative
      dhcp-range=10.65.30.100,10.65.30.255,255.255.255.0,24h
      dhcp-range=10.64.31.1,10.64.31.255,255.255.254.0,24h
      dhcp-option=option:router,10.65.30.1
      dhcp-option=option:dns-server,1.1.1.1,8.8.8.8,8.8.4.4
      dhcp-option=option:netmask,255.255.255.0

      dhcp-range=::,constructor:${lan-dev}.100,slaac,off-link
    '';
  };

  networking.sits.he0 = {
    dev = wan-dev;
    local = "74.73.86.185";
    remote = "209.51.161.14";
  };

  networking.iproute2.enable = true;
  networking.iproute2.rttablesExtraConfig = ''
     ${toString mullvadMark} mullvad
    200 he
  '';

  networking.localCommands = ''
    ip -6 rule add from 2001:470:8e2e::/48 lookup he prio 0 || true
    ip -6 route flush cache
    ip -6 route replace default dev he0 src 2001:470:8e2e:20::d table he
    ip -6 route flush cache

    ip route flush cache
    ip rule add fwmark ${toString mullvadMark} table mullvad
    ip route replace default dev mullvad table mullvad
    ip route flush cache
  '';

  # boot.kernel.sysctl."net.ipv6.conf.${wan-dev}.disable_ipv6" = true;

  networking.interfaces.${wan-dev} = {
    macAddress = "3c:97:0e:19:7e:5c";
    useDHCP = true;
  };

  networking.interfaces.he0.ipv6 = {
    addresses = [
      { address = "2001:470:1f06:1195::2"; prefixLength = 64; }
      { address = "2001:470:8e2e:20::d"; prefixLength = 64; }
    ];
    # routes = [{ address = "::"; prefixLength = 0; }];
  };

  networking.interfaces."${lan-dev}".useDHCP = false;
  networking.interfaces."${lan-dev}.255".useDHCP = true;
  networking.interfaces."${lan-dev}.100" = {
    ipv4.addresses = [ {
      address = "10.65.30.1";
      prefixLength = 24;
    } ];
    useDHCP = false;
  };
  networking.interfaces."${lan-dev}.30" = {
    ipv4.addresses = [ {
      address = "10.64.30.1";
      prefixLength = 23;
    } ];
    useDHCP = false;
  };
}