# Nord-style status line built natively, no theme plugin.
# The powerline separators (U+E0B0..U+E0B3) are written as escapes via
# fromJSON: literal private-use glyphs get stripped silently on copy/paste.
# Commas inside #{?...} separate arguments, hence the escaped `#,` below.

let
  sep = builtins.fromJSON ''
    {
      "right":     "",
      "rightThin": "",
      "left":      "",
      "leftThin":  ""
    }
  '';
in
{
  programs.tmux = {
    enable = true;
    prefix = "C-a";
    keyMode = "vi";
    mouse = true;
    terminal = "tmux-256color"; # truecolor, italics and undercurl in nvim
    escapeTime = 10; # the 500ms default lags leaving insert mode in nvim
    focusEvents = true; # nvim autoread
    historyLimit = 50000;
    baseIndex = 1; # window numbers match the number row

    extraConfig = ''
      set -g status-keys vi

      # outer terminal does 24-bit colour
      set -sa terminal-features ",*:RGB"

      # forward Shift+Enter and other extended keys as CSI-u (tmux >= 3.5)
      set -s extended-keys always
      set -s extended-keys-format csi-u
      set -as terminal-features '*:extkeys'

      # Status bar options
      set -g status-interval 5
      set -g status-justify left

      # Clock mode
      setw -g clock-mode-colour cyan

      # Colors
      set -g status-bg black
      set -g status-fg white

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

      # Panel split and selection, new panes/windows inherit the cwd
      unbind %
      unbind '"'
      bind v split-window -v -c "#{pane_current_path}"
      bind c split-window -h -c "#{pane_current_path}"
      bind i new-window -c "#{pane_current_path}"
      bind -r b previous-window
      bind -r n next-window

      # Move around panes with hjkl
      bind h select-pane -L
      bind j select-pane -D
      bind k select-pane -U
      bind l select-pane -R

      # Resize panes
      bind -r H resize-pane -L 5
      bind -r J resize-pane -D 5
      bind -r K resize-pane -U 5
      bind -r L resize-pane -R 5

      # copy to both the clipboard and primary selection
      bind -T copy-mode-vi v send-keys -X begin-selection
      bind -T copy-mode-vi C-v send-keys -X rectangle-toggle
      bind -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "wl-copy && wl-copy --primary"
      bind -T copy-mode-vi Enter send-keys -X copy-pipe-and-cancel "wl-copy && wl-copy --primary"
      bind -T copy-mode-vi MouseDragEnd1Pane send-keys -X copy-pipe-and-cancel "wl-copy && wl-copy --primary"

      # Kill commands
      bind q confirm-before -p "kill window #W? (y/n)" kill-window
      bind Q confirm-before -p "kill session #S? (y/n)" kill-session

      # Bars
      set -g status-left-length 24
      set -g status-left "#[fg=black,bg=blue,bold] #{=20:session_name} #[fg=blue,bg=black,nobold,noitalics,nounderscore]${sep.right}"
      set -g status-right "#{?client_prefix,#[fg=black#,bg=yellow#,bold] ^A ,}#[fg=brightblack,bg=black,nobold,noitalics,nounderscore]${sep.left}#[fg=white,bg=brightblack] %Y-%m-%d #[fg=white,bg=brightblack,nobold,noitalics,nounderscore]${sep.leftThin}#[fg=white,bg=brightblack] %H:%M #[fg=cyan,bg=brightblack,nobold,noitalics,nounderscore]${sep.left}#[fg=black,bg=cyan,bold] #H "

      # Windows
      set -g window-status-format "#[fg=black,bg=brightblack,nobold,noitalics,nounderscore]${sep.right} #[fg=white,bg=brightblack]#I #[fg=white,bg=brightblack,nobold,noitalics,nounderscore]${sep.rightThin} #[fg=white,bg=brightblack]#W #F #[fg=brightblack,bg=black,nobold,noitalics,nounderscore]${sep.right}"
      set -g window-status-current-format "#[fg=black,bg=cyan,nobold,noitalics,nounderscore]${sep.right} #[fg=black,bg=cyan]#I #[fg=black,bg=cyan,nobold,noitalics,nounderscore]${sep.rightThin} #[fg=black,bg=cyan]#W #F #[fg=cyan,bg=black,nobold,noitalics,nounderscore]${sep.right}"
      set -g window-status-separator ""
    '';
  };
}