{ lib }:
let
  inherit (lib) concatStringsSep;
in
rec {
  # See https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/misc/ids.nix
  ids = {
    uids = {
      matrix-syncv3 = 400;
      gitea-runner = 401;
      jellyseerr = 402;
      atticd = 403;
    };
    gids = {
      matrix-syncv3 = 400;
      gitea-runner = 401;
      jellyseerr = 402;
      atticd = 403;
    };
  };

  nginx = {
    proxyHeaders = ''
      # Setting any proxy_header in a child (e.g. location) will nuke the parents...
      proxy_set_header X-Origin-URI $request_uri;
      proxy_set_header Host $host;
      proxy_set_header X-Host $http_host;
      proxy_set_header X-Forwarded-Host $http_host;
      proxy_set_header X-Forwarded-Server $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_set_header X-Forwarded-Protocol $scheme;
      proxy_set_header X-Scheme $scheme;
    '';
  };

  nix = {
    cache = rec {
      substituters = [
        "https://nix-cache.${pubDomain}/main"
      ];
      keys = [
        "main:mMChkG8LwXrFirVfudqjSHasK1jV31OVElYD3eImYl8="
      ];
      conf = ''
        extra-substituters = ${concatStringsSep " " substituters}
        extra-trusted-public-keys = ${concatStringsSep " " keys}
      '';
    };
  };

  pubDomain = "nul.ie";
  colony = {
    domain = "ams1.int.${pubDomain}";
    pubV4 = "94.142.240.44";
    prefixes = with lib.my.net.cidr; rec {
      all = {
        v4 = "10.100.0.0/16";
        v6 = "2a0e:97c0:4d2:10::/60";
      };
      base = {
        v4 = subnet 8 0 all.v4;
        v6 = subnet 4 0 all.v6;
      };
      vms = {
        v4 = subnet 8 1 all.v4;
        v6 = subnet 4 1 all.v6;
      };
      ctrs = {
        v4 = subnet 8 2 all.v4;
        v6 = subnet 4 2 all.v6;
      };
      oci = {
        v4 = subnet 8 3 all.v4;
        v6 = subnet 4 3 all.v6;
      };

      cust = {
        v4 = subnet 8 100 all.v4; # single ip for routing only
        v6 = "2a0e:97c0:4d2:2000::/56";
      };
      mail = {
        v4 = "94.142.241.227/32";
        v6 = subnet 8 0 cust.v6;
      };
      darts = {
        v4 = "94.142.242.255/32";
        v6 = subnet 8 1 cust.v6;
      };

      vip1 = "94.142.241.224/30";
      vip2 = "94.142.242.254/31";

      as211024 = {
        v4 = subnet 8 50 all.v4;
        v6 = "2a0e:97c0:4df::/64";
      };
      home.v6 = "2a0e:97c0:4d0::/48";
    };
    fstrimConfig = {
      enable = true;
      # backup happens at 05:00
      interval = "04:45";
    };
  };

  home = rec {
    domain = "h.${pubDomain}";
    vlans = {
      hi = 100;
      lo = 110;
      untrusted = 120;
      wan = 130;
    };
    hiMTU = 9000;
    routers = [
      "river"
      "stream"
    ];
    routersPubV4 = [
      "109.255.252.123" # placeholder
      "109.255.252.104"
    ];

    prefixes = with lib.my.net.cidr; rec {
      modem = {
        v4 = "192.168.0.0/24";
      };
      all = {
        v4 = "192.168.64.0/18";
        v6 = "2a0e:97c0:4d0::/60";
      };
      core = {
        v4 = subnet 6 0 all.v4;
      };
      hi = {
        v4 = subnet 4 1 all.v4;
        v6 = subnet 4 1 all.v6;
      };
      lo = {
        v4 = subnet 3 1 all.v4;
        v6 = subnet 4 2 all.v6;
      };
      untrusted = {
        v4 = subnet 6 16 all.v4;
        v6 = subnet 4 3 all.v6;
      };
      inherit (colony.prefixes) as211024;
    };
    vips = with lib.my.net.cidr; {
      hi = {
        v4 = host (4*256-2) prefixes.hi.v4;
        v6 = host 65535 prefixes.hi.v6;
      };
      lo = {
        v4 = host (8*256-2) prefixes.lo.v4;
        v6 = host 65535 prefixes.lo.v6;
      };
      untrusted = {
        v4 = host 254 prefixes.untrusted.v4;
        v6 = host 65535 prefixes.untrusted.v6;
      };
      as211024 = {
        v4 = host 4 prefixes.as211024.v4;
        v6 = host ((1*65536*65536*65536) + 65535) prefixes.as211024.v6;
      };
    };
  };

  kelder = {
    groups = {
      storage = 2000;
      media = 2010;
    };

    domain = "hentai.engineer";
    vpn = {
      port = 51820;
    };
    prefixes = with lib.my.net.cidr; rec {
      all.v4 = "172.16.64.0/20";
      ctrs.v4 = subnet 4 0 all.v4;
    };
  };
  sshKeyFiles = {
    me = ../.keys/me.pub;
    deploy = ../.keys/deploy.pub;
    rsyncNet = ../.keys/zh2855.rsync.net.pub;
    mailcowAcme = ../.keys/mailcow-acme.pub;
  };
  sshHostKeys = {
    mail-vm = ../.keys/mail-vm-host.pub;
  };
}