{ flake, config, lib, pkgs, ... }:
{
  imports = [ ./dsl.nix ./bifrost ];

  config = {
    networking = {
      hostName = "vidhar";
      domain = "yggdrasil";
      search = [ "yggdrasil" ];

      useDHCP = false;
      useNetworkd = true;

      interfaces."lan" = {
        ipv4.addresses = [
          { address = "10.141.0.1"; prefixLength = 24; }
        ];
      };
      interfaces."mgmt" = {
        ipv4.addresses = [
          { address = "10.141.1.1"; prefixLength = 24; }
        ];
      };
      interfaces."dmz01" = {
        ipv4.addresses = [
          { address = "10.141.2.1"; prefixLength = 24; }
        ];
      };

      vlans = {
        mgmt = {
          id = 2;
          interface = "eno2";
        };
        lan = {
          id = 3;
          interface = "eno2";
        };
        dmz01 = {
          id = 4;
          interface = "eno2";
        };
      };

      firewall.enable = false;
      nftables = {
        enable = true;
        rulesetFile = ./ruleset.nft;
      };
    };

    services.resolved = {
      llmnr = "false";
    };

    services.kea = {
      dhcp4 = {
        enable = true;
        settings = {
          valid-lifetime = 4000;
          rebind-timer = 2000;
          renew-timer = 1000;

          interfaces-config = {
            interfaces = [ "lan" "mgmt" ];
          };

          lease-database = {
            name = "/var/lib/kea/dhcp4.leases";
            persist = true;
            type = "memfile";
          };

          client-classes = [
            { name = "ipxe";
              test = "option[77].hex == 'iPXE'";
              next-server = "10.141.0.1";
              boot-file-name = "netboot.ipxe";
              only-if-required = true;
            }
            { name = "uefi-64";
              test = "substring(option[60].hex,0,20) == 'PXEClient:Arch:00007' or substring(option[60].hex,0,20) == 'PXEClient:Arch:00008' or substring(option[60].hex,0,20) == 'PXEClient:Arch:00009'";
              only-if-required = true;
              option-data = [
                { name = "tftp-server-name"; data = "10.141.0.1"; }
              ];
              boot-file-name = "ipxe.efi";
            }
            { name = "legacy";
              test = "substring(option[60].hex,0,20) == 'PXEClient:Arch:00000'";
              only-if-required = true;
              option-data = [
                { name = "tftp-server-name"; data = "10.141.0.1"; }
              ];
              boot-file-name = "undionly.kpxe";
            }
          ];

          subnet4 = [
            { subnet = "10.141.0.0/24";
              option-data = [
                { name = "domain-name-servers";
                  data = "10.141.0.1";
                }
                { name = "broadcast-address";
                  data = "10.141.0.255";
                }
                { name = "routers";
                  data = "10.141.0.1";
                }
                { name = "domain-name";
                  data = "yggdrasil";
                }
              ];
              pools = [ { pool = "10.141.0.128 - 10.141.0.254"; } ];
              reservations = [];
              require-client-classes = ["ipxe" "uefi-64" "legacy"];
            }
            { subnet = "10.141.1.0/24";
              option-data = [
                { name = "domain-name-servers";
                  data = "10.141.1.1";
                }
                { name = "broadcast-address";
                  data = "10.141.1.255";
                }
              ];
              pools = [ { pool = "10.141.1.128 - 10.141.1.254"; } ];
              reservations = [
                { hostname = "switch01";
                  hw-address = "60:a4:b7:53:94:b5";
                  ip-address = "10.141.1.2";
                }
                { hostname = "ap01";
                  hw-address = "74:ac:b9:29:ad:9a";
                  ip-address = "10.141.1.4";
                }
              ];
            }
            { subnet = "10.141.2.0/24";
              option-data = [
                { name = "domain-name-servers";
                  data = "10.141.2.1";
                }
                { name = "broadcast-address";
                  data = "10.141.2.255";
                }
                { name = "routers";
                  data = "10.141.2.1";
                }
              ];
              pools = [ { pool = "10.141.2.128 - 10.141.2.254"; } ];
              reservations = [];
            }
          ]; 
        };
      };
      dhcp6 = {
        enable = true;
        settings = {
          interfaces-config = {
            interfaces = [ "lan" ];
          };

          lease-database = {
            name = "/var/lib/kea/dhcp6.leases";
            persist = true;
            type = "memfile";
          };
        };
      };
    };

    systemd.network.networks = {
      "eno1" = {
        matchConfig.Name = "eno1";
        linkConfig = {
          ActivationPolicy = "down";
        };
      };
      "eno2" = {
        matchConfig.Name = "eno2";
        networkConfig.LinkLocalAddressing = "no";
      };
    };

    systemd.services."installer-atftpd" = {
      description = "TFTP Server for PXE Booting NixOS Installer";
      after = [ "network.target" ];
      wantedBy = [ "multi-user.target" ];
      serviceConfig.ExecStart = let
        installerBuild = flake.nixosConfigurations.installer-x86_64-linux-netboot.config.system.build;
        tftpRoot = pkgs.runCommandLocal "installer-netboot" {} ''
          mkdir -p $out
          install -m 0444 -t $out \
            ${installerBuild.netbootRamdisk}/initrd \
            ${installerBuild.kernel}/bzImage \
            ${installerBuild.netbootIpxeScript}/netboot.ipxe \
            ${pkgs.ipxe}/ipxe.efi ${pkgs.ipxe}/undionly.kpxe
        '';
      in "${pkgs.atftp}/sbin/atftpd --daemon --no-fork --bind-address=10.141.0.1 ${tftpRoot}";
    };
  };
}