{ pkgs, ... }:

{
  programs.tmux = {
    enable = true;
    prefix = "C-Space";
    keyMode = "vi";
    mouse = true;
    escapeTime = 10;
    terminal = "tmux-256color";
    historyLimit = 50000;
    baseIndex = 1;
    plugins = with pkgs.tmuxPlugins; [
      vim-tmux-navigator
      resurrect
      {
        plugin = continuum;
        extraConfig = ''
          set -g @continuum-restore 'on'
          set -g @continuum-save-interval '15'
        '';
      }
    ];
    extraConfig = ''
      # True-color + undercurl passthrough for nvim LSP underlines
      set -ga terminal-overrides ',*256col*:Tc'
      set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'
      set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'

      set -g renumber-windows on
      setw -g pane-base-index 1

      # Splits open in pane's CWD
      bind | split-window -h -c "#{pane_current_path}"
      bind - split-window -v -c "#{pane_current_path}"
      unbind '"'
      unbind %
      bind c new-window -c "#{pane_current_path}"

      # Reload config
      bind r source-file ~/.config/tmux/tmux.conf \; display "reloaded"

      # Vi copy-mode: v select, y yank to X11 clipboard
      bind-key -T copy-mode-vi v send -X begin-selection
      bind-key -T copy-mode-vi y send -X copy-pipe-and-cancel 'xclip -selection clipboard -i'

      # Default layout on new session: main + right pane (~20%) + bottom pane (~15%)
      set-hook -g session-created 'split-window -v -l 15% -c "#{pane_current_path}" ; select-pane -t 1 ; split-window -h -l 20% -c "#{pane_current_path}" ; select-pane -t 1'
    '';
  };
}