{ config, lib, pkgs, user, ... }:
let
  inherit (lib) mkIf mkEnableOption;
  inherit (lib.strings) concatStringsSep;

  cfg = config.modules.${user}.shell.toolset.btop;
in
{
  options.modules.${user}.shell.toolset.btop = {
    enable = mkEnableOption "system-monitor";
  };

  config = mkIf cfg.enable {
    home-manager.users.${user} = {
      home.packages = with pkgs; [ btop ];

      programs.btop = {
        enable = true;
        settings = {
          force_tty = false;
          vim_keys = true; # Directional keys: "h,j,k,l,g,G"
          update_ms = 1500; # ms (s^{-3})
          temp_scale = "celsius";
          base_10_sizes = false;
          show_cpu_freq = true;
          clock_format = "%H:%M";
          background_update = true;
          disks_filter = "exclude=/boot";

          rounded_corners = true;
          theme_background = false;
          truecolor = true;
          presets = concatStringsSep "," [
            "cpu:1:default"
            "proc:0:default cpu:0:default"
            "mem:0:default"
            "net:0:default cpu:0:block"
            "net:0:tty"
          ];
          graph_symbol = "braille";
          graph_symbol_cpu = "default";
          graph_symbol_mem = "default";
          graph_symbol_net = "default";
          graph_symbol_proc = "default";
          shown_boxes = "proc cpu mem net";

          proc_sorting = "cpu lazy";
          proc_reversed = false;
          proc_tree = false;
          proc_colors = true;
          proc_gradient = true;
          proc_per_core = true;
          proc_mem_bytes = true;
          proc_info_smaps = false;
          proc_left = false;

          cpu_graph_upper = "total";
          cpu_graph_lower = "total";
          cpu_single_graph = false;
          cpu_bottom = false;
          show_uptime = true;
          check_temp = true;
          cpu_sensor = "Auto";
          show_coretemp = true;
          cpu_core_map = "";
          custom_cpu_name = "";

          mem_graphs = true;
          mem_below_net = false;

          show_swap = true;
          swap_disk = true;
          show_disks = true;
          only_physical = true;
          use_fstab = false; # Enable -> disables `only_physical`
          disk_free_priv = false;
          show_io_stat = true;

          io_mode = false;
          io_graph_combined = false;
          io_graph_speeds = "";

          net_download = 100;
          net_upload = 100;
          net_auto = true;
          net_sync = false;
          net_iface = "br0";
          show_battery = true;
          selected_battery = "Auto";
          log_level = "DEBUG";
        };
      };
    };
  };
}