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{ config
, pkgs
, ...
}:

let
  cmus-np = pkgs.writeScriptBin "cmus-np" ''
    ${pkgs.cmus}/bin/cmus-remote -Q | awk '
    /tag artist/ { $1=$2=""; artist = substr($0,3) }
    /tag title / { $1=$2=""; title  = substr($0,3) }
    END { if(artist&&title) printf "%s / %s\n", artist, title}
    '
  '';

  cmus-status = pkgs.writeScriptBin "cmus-status" ''
    # ${pkgs.cmus}/bin/cmus-remote -Q | awk '/status/ { print $2 }'
    ${pkgs.cmus}/bin/cmus-remote -Q | awk '
    /status/ && $2~/playing/ { print "||" }
    /status/ && $2~/paused/ { print "|>" }
    /status/ && $2~/stopped/ { print "·" }
    '
  '';

  date-tz = tz: pkgs.writeScriptBin "date" ''
    env TZ=${tz} date +"%H%M"
  '';
  date-ist = date-tz "Asia/Kolkata";
  date-bst = date-tz "Europe/London";
  date-hel = date-tz "Europe/Helsinki";

  # plugins
  thumbs = {
    plugin = pkgs.tmuxPlugins.tmux-thumbs;
    extraConfig = ''
      set -g @thumbs-key F
      set -g @thumbs-command 'echo -n {} | xclip -i -sel p -f | xclip -i -sel c'
      set -g @thumbs-fg-color white
      set -g @thumbs-hint-bg-color yellow
      set -g @thumbs-hint-fg-color black
      set -g @thumbs-position left
      set -g @thumbs-alphabet colemak-homerow
    '';
  };

  resurrect = {
    plugin = pkgs.tmuxPlugins.resurrect;
    extraConfig =
      let
        processes = builtins.map (name: ''"~${name}->${name}"'') [
          "weechat --run-command ;"
        ];
      in
      ''
        set -g @resurrect-strategy-nvim 'session'
        set -g @resurrect-strategy-vim 'session'
        set -g @resurrect-dir '~/.local/share/tmux/resurrect'
        set -g @resurrect-processes '${builtins.toString processes}'
      '';
  };

in
{
  programs.tmux = {
    enable = true;
    plugins = [ thumbs ];
    prefix = "C-t";
    keyMode = "vi";
    terminal = "xterm-256color-italic";
    extraConfig = ''
      bind r source-file ~/.config/tmux/tmux.conf

      set escape-time 20
      set -g mouse on

      set -g base-index 1
      setw -g pane-base-index 1

      # session jumper
      bind-key -n C-n run-shell "tmux-fzf"

      # pane binds
      unbind-key E
      bind-key h select-pane -L
      bind-key n select-pane -D
      bind-key e select-pane -U
      bind-key i select-pane -R
      bind-key -r H resize-pane -L 5
      bind-key -r N resize-pane -D 5
      bind-key -r E resize-pane -U 5
      bind-key -r I resize-pane -R 5

      # window binds
      bind -n M-h  previous-window
      bind -n M-i  next-window
      bind -n M-?  switch-client -p
      bind -n M-/  switch-client -n
      bind-key "{" split-window -h -c "#{pane_current_path}"
      bind-key "}" split-window -v -c "#{pane_current_path}"
      bind-key s choose-session
      bind-key c new-window -c "#{pane_current_path}"
      bind-key ) swap-window -t +1
      bind-key ( swap-window -t -1
      bind-key [ copy-mode

      # statusline hide / unhide

      bind -n M-down set -sq status off\; set -sq pane-border-status off
      bind -n M-up   set -sq status on\;  set -sq pane-border-status top

      bind-key -r "<" swap-window -d -t -1
      bind-key -r ">" swap-window -d -t +1

      bind-key -T copy-mode-vi v send-keys -X begin-selection
      bind-key -T copy-mode-vi y send-keys -X copy-pipe "xclip -i -sel p -f | xclip -i -sel c "
      bind-key -T copy-mode-vi r send-keys -X rectangle-toggle
      bind P paste-buffer

      set-window-option -g allow-rename off

      set-option -g status-justify absolute-centre
      set-option -g status-position bottom

      set -g window-status-current-format " #[fg=colour15]#W#{?window_zoomed_flag, #[fg=colour2]+,}#{?window_activity_flag, #[fg=colour3]!,}"
      set -g window-status-format         " #[fg=colour8]#W#{?window_zoomed_flag, #[fg=colour2]+,}"

      # status right
      set -g  status-style "bg=colour0"
      set -ag status-style "fg=colour7"

      set -g  status-right-length 70
      set -g status-right "#[fg=colour15]#(${date-ist}/bin/date) #[fg=colour8]IST  "
      set -ag status-right "#[fg=colour15]#(${date-hel}/bin/date) #[fg=colour8]HEL  "
      set -ag status-right "#[fg=colour15]#(${date-bst}/bin/date) #[fg=colour8]BST  "
      set -ag status-right "#[fg=colour15]#(date +"%d/%m")#[fg=colour8] #(date +"%Y")"

      # status left
      set -g  status-left-length 70
      set -g  status-left "#[fg=colour7]#(bat -q)  "
      set -ag status-left "#[fg=colour15]#(${cmus-np}/bin/cmus-np) #[fg=colour8]#(${cmus-status}/bin/cmus-status)"

      # include pwd and branch in pane border
      set -g pane-border-status top
      set -g pane-border-style fg=colour11
      set -g pane-active-border-style fg=colour8
      set -g  pane-border-format "  #[fg=colour15]#(${pkgs.prompt}/bin/prompt cwd '#{pane_current_path}') "
      set -ag pane-border-format "#[fg=colour8]#(${pkgs.prompt}/bin/prompt vcs '#{pane_current_path}')  "

      # popup styles
      set -g popup-border-style "fg=colour8"

      # load all sessions
      source-file ~/.config/tmux/sessions/all
    '';
  };
}