# SPDX-FileCopyrightText: 2023-2024 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later

{ lib, ... }:
let
  mkSubnet = v4: v6:
    let
      splitCidr = lib.splitString "/";
      fst = lib.flip lib.elemAt 0;
      snd = lib.flip lib.elemAt 1;

      v4Split = splitCidr v4;
      v6Split = splitCidr v6;
    in
    {
      v4 = rec {
        cidr = v4;
        net = fst v4Split;
        suffix = snd v4Split;
        withoutLastComponent = lib.substring 0 ((lib.stringLength net) - 1) net;
        gateway = "${withoutLastComponent}1";
        gatewayCidr = "${gateway}/${suffix}";
      };
      v6 = rec {
        cidr = v6;
        net = fst v6Split;
        suffix = snd v6Split;
        withoutLocalComponent = lib.substring 0 ((lib.stringLength net) - 1) net;
        gateway = "${net}1";
        gatewayCidr = "${gateway}/${suffix}";
      };
    };

  macToIpv6InterfaceIdentifier = mac:
    let
      macList = lib.splitString ":" mac;
      macListIpv6 = lib.flatten [
        (lib.toHexString (lib.bitXor (builtins.fromTOML "x = 0x${lib.elemAt macList 0}").x 2))
        (lib.sublist 1 2 macList)
        [ "ff" "fe" ]
        (lib.sublist 3 3 macList)
      ];
      interfaceIdentifierNoColons = lib.strings.toLower (lib.concatStrings macListIpv6);
      interfaceIdentifier = lib.concatStrings [
        (lib.substring 0 4 interfaceIdentifierNoColons)
        ":"
        (lib.substring 4 4 interfaceIdentifierNoColons)
        ":"
        (lib.substring 8 4 interfaceIdentifierNoColons)
        ":"
        (lib.substring 12 4 interfaceIdentifierNoColons)
      ];
    in
    interfaceIdentifier;
in
rec {
  vlan = {
    lan = {
      id = 10;
      subnet = mkSubnet "10.80.1.0/24" "2001:470:73b9:1::/64";
      domain = "lan.shinonome-lab.de";
    };
    management = {
      id = 20;
      subnet = mkSubnet "10.80.2.0/24" "2001:470:73b9:2::/64";
      domain = "management.shinonome-lab.de";
    };
    guest = {
      id = 30;
      subnet = mkSubnet "10.80.3.0/24" "2001:470:73b9:3::/64";
      domain = "guest.shinonome-lab.de";
    };
    iot = {
      id = 40;
      subnet = mkSubnet "10.80.4.0/24" "2001:470:73b9:4::/64";
      domain = "iot.shinonome-lab.de";
    };
  };
  tc = {
    interface = "enp1s0";
    # 4160 kbit is slightly smaller than the average upload
    rate = "4160kbit";
    major = 1;
    default = 2;
    classes = [
      # default
      {
        minor = 2;
        rate = "800kbit";
        prio = 50;
      }
      # DNS, small packets (e.g., TCP ACK)
      {
        minor = 3;
        rate = "250kbit";
        prio = 0;
        qdiscArgs = [ "pfifo_fast" ];
      }
      # interactive SSH
      {
        minor = 4;
        rate = "128kbit";
        prio = 2;
      }
      # torrent
      {
        minor = 5;
        rate = "250kbit";
        ceil = "3000kbit";
        prio = 100;
      }
      # HTTP
      {
        minor = 6;
        rate = "1500kbit";
        prio = 25;
      }
      # wg-home
      {
        minor = 7;
        rate = "250kbit";
        prio = 10;
      }
      # VoIP
      {
        minor = 8;
        rate = "256kbit";
        ceil = "384kbit";
        prio = 3;
        qdiscArgs = [ "pfifo_fast" ];
      }
      # Backup
      {
        minor = 9;
        rate = "350kbit";
        ceil = "3000kbit";
        prio = 90;
      }
      # guest
      {
        minor = 10;
        rate = "200kbit";
        ceil = "2000kbit";
        prio = 99;
      }
    ];
  };
  staticHosts = lib.mapAttrs
    (_: options: options // {
      address6 = "${vlan.${options.vlan}.subnet.v6.withoutLocalComponent}${macToIpv6InterfaceIdentifier options.hwaddr}";
    })
    {
      fuuko = {
        hwaddr = "18:c0:4d:d2:93:f0";
        address4 = "10.80.1.98";
        vlan = "lan";
      };
    };
}