{
  config,
  lib,
  pkgs,
  ...
}: let
  inherit (lib) mkIf mkOption types filterAttrs mapAttrsToList;
  cfg = config.homelab.motd;

  # Collect all homelab services that define a motd string
  motdServices =
    mapAttrsToList (_: v: v.motd)
    (filterAttrs (_: v: v ? motd && v.motd != null) config.homelab);
in {
  options.homelab.motd = {
    enable = mkOption {
      type = types.bool;
      default = true;
      description = "Enable the homelab MOTD.";
    };
  };

  config = mkIf cfg.enable {
    environment.etc."motd".text = ''
      #!/usr/bin/env bash

      BLUE="\033[1;34m"
      RED="\033[1;31m"
      YELLOW="\033[1;33m"
      RESET="\033[0m"

      # --- System Info ---
      default_iface=$(ip route | awk '/default/ {print $5; exit}')
      ip_addr=$(ip -4 addr show "''${default_iface}" | awk '/inet / {print $2}' | cut -d/ -f1)
      nixos_version=$(grep VERSION= /etc/os-release | cut -d'"' -f2)
      kernel_version=$(uname -r)

      echo -e "''${YELLOW}System Info''${RESET}"
      echo -e "  Hostname: $(hostname)"
      echo -e "  Interface: ''${default_iface}"
      echo -e "  IPv4: ''${ip_addr}"
      echo -e "  NixOS: ''${nixos_version}"
      echo -e "  Kernel: ''${kernel_version}"
      echo

      # --- Resource Stats ---
      cpu_usage=$(top -bn1 | grep "Cpu(s)" | awk '{print 100 - $8 "%"}')
      mem_total=$(grep MemTotal /proc/meminfo | awk '{print $2}')
      mem_avail=$(grep MemAvailable /proc/meminfo | awk '{print $2}')
      mem_used=$((mem_total - mem_avail))
      mem_percent=$((100 * mem_used / mem_total))
      uptime_fmt=$(uptime -p 2>/dev/null || cat /proc/uptime | awk '{print int($1/3600)"h "int(($1%3600)/60)"m"}')

      echo -e "''${YELLOW}Resources''${RESET}"
      echo -e "  CPU Usage: ''${cpu_usage}"
      echo -e "  Memory: ''${mem_percent}% used"
      echo -e "  Uptime: ''${uptime_fmt}"
      echo

      # --- Homelab Services ---
      echo -e "''${YELLOW}Homelab Services''${RESET}"

      ${lib.concatStringsSep "\n" (map (service: ''
          if systemctl list-units --type=service --all | grep -q "^''${service}"; then
            status=$(systemctl is-active ''${service} 2>/dev/null)
            if [ "''${status}" = "active" ]; then
              echo -e "  ''${BLUE}${service}''${RESET} - running"
            else
              echo -e "  ''${RED}${service}''${RESET} - not running"
            fi
          else
            echo -e "  ''${RED}${service}''${RESET} - not found"
          fi
        '')
        motdServices)}

      echo
    '';

    environment.etc."motd".mode = "0755";

    programs.bash.interactiveShellInit = ''
      /etc/motd
    '';
  };
}