{ config, pkgs, lib, ... }:

{
  imports =
    [
      ./hardware-configuration.nix
      ../../configuration/common
      ../../configuration/proxmox-vm
      ../../configuration/dn42
      ../../modules/policyrouting
    ];

  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "/dev/vda";

  networking.hostName = "dn42-il-gw1";

  networking.useDHCP = false;
  networking.interfaces.lo.ipv6.addresses = [ { address = "fd56:4902:eca0:1::1"; prefixLength = 64; } ];
  # VM Nat Netz mercury
  networking.interfaces.ens18.ipv4.addresses = [ { address = "192.168.10.23"; prefixLength = 24; } ];
  # OSPF Netz
  networking.interfaces.ens19 = {};
  # IPv6 Uplink
  networking.interfaces.ens20.ipv6.addresses = [ { address = "2001:638:904:ffc9::7"; prefixLength = 64; } ];

  networking.defaultGateway = { address = "192.168.10.1"; interface = "ens18"; };
  networking.defaultGateway6 = { address = "2001:638:904:ffc9::1"; interface = "ens20"; };
  networking.nameservers = [ "2001:638:904:ffcc::3" "2001:638:904:ffcc::4" "141.24.40.3" "141.24.40.4" ];

  networking.wireguard.enable = true;
  networking.wireguard.interfaces = {
    # n0emis
    wg0197 = {
      ips = [
        "fe80::42:1/128"
        # peer fe80::42:42:1/128
      ];
      postSetup = ''
      ip -6 route flush dev wg0197
      ip addr del dev wg0197 fe80::42:1/128 && ip addr add dev wg0197 fe80::42:1/128 peer fe80::42:42:1/128
      '';
      listenPort = 50197;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "himalia.dn42.n0emis.eu:52574";
          publicKey = "ObF+xGC6DdddJer0IUw6nzC0RqzeKWwEiQU0ieowzhg=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg0197";
    };
    # e1mo
    wg0565 = {
      ips = [
        "fe80::43:43:1/128"
        # peer fe80::43:1/128
      ];
      postSetup = ''
      ip -6 route flush dev wg0565
      ip addr del dev wg0565 fe80::43:43:1/128 && ip addr add dev wg0565 fe80::43:43:1/128 peer fe80::43:1/128
      '';
      listenPort = 50565;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "de-fra1.dn42.net.dont-break.it:22574";
          publicKey = "shGS36iaWgcJL1FVLhZHPxLHkPETIy2FFdgmNyx1DSk=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg0565";
    };
    # fooker
    wg1271 = {
      ips = [
        "fe80::1/128"
        # peer fe80::2/128
      ];
      postSetup = ''
      ip -6 route flush dev wg1271
      ip addr del dev wg1271 fe80::1/128 && ip addr add dev wg1271 fe80::1/128 peer fe80::2/128
      '';
      listenPort = 51271;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "north.zitadelle.dev.open-desk.net:23425";
          publicKey = "xxPjHWVzePinOOMnuhwGAI3PKY9pvpifIvIbPu3IwQw=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg1271";
    };
    wg1272 = {
      ips = [
        "fe80::1:1/128"
        # peer fe80::1:2/128
      ];
      postSetup = ''
      ip -6 route flush dev wg1272
      ip addr del dev wg1272 fe80::1:1/128 && ip addr add dev wg1272 fe80::1:1/128 peer fe80::1:2/128
      '';
      listenPort = 51272;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "south.zitadelle.dev.open-desk.net:23425";
          publicKey = "Iae2R4B7VVsloKWK8T1j1vLMuxpP4dVDUdzEg/YpAjE=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg1272";
    };
    # margau
    wg1280 = {
      ips = [
        "fde3:4c0d:2836:ff00::21/127"
        # peer fde3:4c0d:2836:ff00::20/127
      ];
      listenPort = 51280;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "wg1.margau.ipv6.church:51830";
          publicKey = "CEge9jdHQArzdniUiWyB3IUZOjGiew3gPmz/MOf4ahU=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg1280";
    };
    # perflyst
    wg1302 = {
      ips = [
        "fe80::a14e/128"
        # peer fe80::a14d/128
      ];
      postSetup = ''
      ip -6 route flush dev wg1302
      ip addr del dev wg1302 fe80::a14e/128 && ip addr add dev wg1302 fe80::a14e/128 peer fe80::a14d/128
      '';
      listenPort = 51302;
      allowedIPsAsRoutes = false;
      peers = [
        {
          allowedIPs = [ "fe80::/10" "fd00::/8" ];
          endpoint = "[2a03:4000:6:f6ed::1]:22574";
          publicKey = "TSPvvpMY8dCFk6gd58aYtkibtqUn8EzIF6dXP52b3y8=";
        }
      ];
      privateKeyFile = "/var/src/secrets/wireguard/wg1302";
    };
  };

  petabyte.policyrouting = {
    enable = true;
    rules6 = [
      { rule = "from all to fd56:4902:eca0::/48 lookup 1337"; prio = 10000; }
      { rule = "from all to all lookup 2342"; prio = 10000; }
      { rule = "from all to fd56:4902:eca0::/48 unreachable"; prio = 20000; }
      { rule = "from fd56:4902:eca0::/48 to all unreachable"; prio = 20000; }
    ];
  };

  services.bird2.enable = true;
  services.bird2.config = ''
  router id ${ (lib.head config.networking.interfaces.ens18.ipv4.addresses).address };

  ipv6 table ospf6;
  ipv6 table bgp6;

  protocol direct {
          interface "lo";
          ipv6 {
                  table ospf6;
          };
  }

  protocol static {
          ipv6 {
                  table bgp6;
          };
          route fd56:4902:eca0::/48 via "lo";
          route fd56:4902:eca0::/52 via "lo";
  }

  protocol kernel {
          ipv6 {
                  table ospf6;
                  export filter {
                          krt_prefsrc=fd56:4902:eca0:1::1;
                          accept;
                  };
                  import none;
          };
          kernel table 1337;
  }

  protocol kernel {
          ipv6 {
                  table bgp6;
                  export filter {
                          krt_prefsrc=fd56:4902:eca0:1::1;
                          accept;
                  };
                  import none;
          };
          kernel table 2342;
  }

  protocol ospf v3 {
          ipv6 {
                  table ospf6;
                  import all;
                  export all;
          };
          area 0 {
                  interface "ens19" {
                          cost 80;
                  };
          };
  }

  protocol bgp gw5 {
          local as 4242422574;
          graceful restart on;
          neighbor fd56:4902:eca0:5::1 as 4242422574;
          source address fd56:4902:eca0:1::1;
          ipv6 {
                  table bgp6;
                  igp table ospf6;
                  next hop self;
                  import keep filtered;
                  import all;
                  export all;
          };
  }

  protocol bgp gw6 {
          local as 4242422574;
          graceful restart on;
          neighbor fd56:4902:eca0:6::1 as 4242422574;
          source address fd56:4902:eca0:1::1;
          ipv6 {
                  table bgp6;
                  igp table ospf6;
                  next hop self;
                  import keep filtered;
                  import all;
                  export all;
          };
  }

  template bgp bgp_peer {
  	local as 4242422574;
  	graceful restart on;
  	ipv6 {
  		table bgp6;
  		next hop self;
  		import keep filtered;
  		import filter {
  			if net ~ [fd00::/8{48,64}] then accept;
  			reject;
  		};
  		export filter {
  			if net ~ [fd00::/8{48,64}] then accept;
  			reject;
  		};
  	};
  }

  protocol bgp peer_0197_himalia from bgp_peer {
          neighbor fe80::42:42:1%wg0197 as 4242420197;
          source address fe80::42:1;
  }

  protocol bgp peer_0565 from bgp_peer {
  	neighbor fe80::43:1%wg0565 as 4242420565;
  	source address fd80::43:43:1;
  }

  protocol bgp peer_1271_north from bgp_peer {
  	neighbor fe80::2%wg1271 as 4242421271;
  	source address fe80::1;
  }

  protocol bgp peer_1271_south from bgp_peer {
  	neighbor fe80::1:2%wg1272 as 4242421271;
  	source address fe80::1:1;
  }

  protocol bgp peer_1280_wg1 from bgp_peer {
  	neighbor fde3:4c0d:2836:ff00::20%wg1280 as 4242421280;
  	source address fde3:4c0d:2836:ff00::21;
  }

  protocol bgp peer_1302 from bgp_peer {
  	neighbor fe80::a14d%wg1302 as 4242421302;
  	source address fe80::a14e;
  }

  protocol device {
          scan time 10;
  }
  '';

  system.stateVersion = "21.03";
}