{
  config,
  lib,
  pkgs,
  ...
}:

{
  options.tmux.enable = lib.mkEnableOption "tmux";

  config = lib.mkIf config.tmux.enable {
    home.packages = with pkgs; [
      tmuxp
      reptyr
    ];

    programs.tmux = {
      enable = true;
      historyLimit = 100000;
      aggressiveResize = true;
      escapeTime = 0;
      keyMode = "vi";
      # 1-based indexing makes most sense for keyboard layouts (where number row start at 1)
      baseIndex = 1;
      terminal = "tmux-256color";
      extraConfig = ''
        # statusbar
        setw -g  monitor-activity on
        set  -g  visual-activity on
        set  -g  default-command "''${SHELL}"

        # keybindings
        # NOTE: I intend to use defaults whenever feasible
        # - my prefix key is still C-b
        # - however, I do use vi mode
        bind r  source-file ~/.config/tmux/tmux.conf # reload tmux conf
        # Splits
        unbind v
        unbind s
        unbind %   # vsplit
        unbind '"' # hsplit
        bind v    split-window -h -c "#{pane_current_path}"
        bind s    split-window -v -c "#{pane_current_path}"
        bind -r h select-pane  -L
        bind -r j select-pane  -D
        bind -r k select-pane  -U
        bind -r l select-pane  -R
        bind -r H resize-pane  -L 4
        bind -r J resize-pane  -D 4
        bind -r K resize-pane  -U 4
        bind -r L resize-pane  -R 4

        bind-key -T root F1 select-window -t 1
        bind-key -T root F2 select-window -t 2
        bind-key -T root F3 select-window -t 3
        bind-key -T root F4 select-window -t 4
        bind-key -T root F5 select-window -t 5
        bind-key -T root F6 select-window -t 6
        bind-key -T root F7 select-window -t 7
        bind-key -T root F8 select-window -t 8
        bind-key -T root F9 select-window -t 9

        # bind-key j command-prompt -p "join pane from:"  "join-pane -s '%%'"
        # bind-key s command-prompt -p "send pane to:"  "join-pane -t '%%'"
        bind-key -T root S-F1 join-pane -s :1
        bind-key -T root S-F2 join-pane -s :2
        bind-key -T root S-F3 join-pane -s :3
        bind-key -T root S-F4 join-pane -s :4
        bind-key -T root S-F5 join-pane -s :5
        bind-key -T root S-F6 join-pane -s :6
        bind-key -T root S-F7 join-pane -s :7
        bind-key -T root S-F8 join-pane -s :8
        bind-key -T root S-F9 join-pane -s :9

        # statusbar
        set -g status-position top
        set -g status-left-length 20
        set -g window-status-separator ""
        %if "#{==:#{host},desktop-arch}"
        set -g status-left "#[bg=colour235,fg=colour255] #S  #[fg=colour235,bg=default] "
        set -g status-right ""
        %else
        set -g status-left '#h '
        set -g status-right '#(uptime | cut -f 4-5 -d " " | cut -f 1 -d ",") %a %l:%M:%S %p %Y-%m-%d'
        %endif

        # Vi copypaste mode
        if-shell "test '\( #{$TMUX_VERSION_MAJOR} -eq 2 -a #{$TMUX_VERSION_MINOR} -ge 4 \)'" 'bind-key -Tcopy-mode-vi v send -X begin-selection; bind-key -Tcopy-mode-vi y send -X copy-selection-and-cancel'
        if-shell '\( #{$TMUX_VERSION_MAJOR} -eq 2 -a #{$TMUX_VERSION_MINOR} -lt 4\) -o #{$TMUX_VERSION_MAJOR} -le 1' 'bind-key -t vi-copy v begin-selection; bind-key -t vi-copy y copy-selection'
        if-shell '\( #{$TMUX_VERSION_MAJOR} -eq 2 -a #{$TMUX_VERSION_MINOR} -lt 2\) -o #{$TMUX_VERSION_MAJOR} -le 1' 'set-option -g status-utf8 on'

        set -g allow-passthrough on
        set -s extended-keys on
        set -as terminal-features 'xterm*:extkeys'
      '';
    };
  };
}