{ lib, config, ... }:

let cfg = config.this.hosts;
in
{
  options = {
    this.hosts.lan.home = lib.mkEnableOption "Home LAN /etc/hosts";
    this.hosts.mine = lib.mkEnableOption "my /etc/hosts";
    this.hosts.alef.zoar.cx = lib.mkEnableOption "alef.zoar.cx /etc/hosts";
    this.hosts.yggdrasil.public = lib.mkOption {
      description = "Use Yggdrasil addresses for public hosts when possible.";
      type = lib.types.bool;
      default = false;
    };
    this.hosts.yggdrasil.private = lib.mkOption {
      description = "Use Yggdrasil addresses for non-public hosts when possible.";
      type = lib.types.bool;
      default = false;
    };
  };

  config = {
    networking.hosts =
      lib.optionalAttrs cfg.lan.home {
        "172.19.0.14" = ["sage.alef.zoar.cx" "sage"];
        "192.168.1.5" = ["rosemary.alef.zoar.cx" "rosemary"];
      } //
      lib.optionalAttrs cfg.mine {
        "${(if cfg.yggdrasil.public
            then "201:c37f:8bd1:de2c:531e:a3c8:6c38:aa3e"
            else "45.61.184.234")}" = ["alfheim"];
      } //
      lib.optionalAttrs cfg.alef.zoar.cx {
        "173.16.167.196" = ["sage.alef.zoar.cx" "sage"];
      } //
      lib.optionalAttrs cfg.yggdrasil.private {
        "202:96bb:5497:1cc7:94e2:c14d:6333:a50e" = ["tomato.alef.zoar.cx" "tomato"];
        "200:48e6:735d:3637:e3a2:71dc:7a74:27a3" = ["pinto.bean.alef.zoar.cx" "pinto"];
        "200:99a0:d4e1:9b0d:4e72:1202:86ef:17fe" = ["carrot.alef.zoar.cx" "carrot"];
      };

    services.yggdrasil = lib.mkMerge [
      {
        persistentKeys = true;
        settings = {
          Peers = [ "quic://ba.ln.ea.cx:9003" ];
        };
      }
      (lib.mkIf cfg.yggdrasil.public or cfg.yggdrasil.private
        { enable = lib.mkDefault true; })
    ];
  };
}