{ pkgs, ... }:
let
  tbPkg = if pkgs.stdenv.isDarwin then pkgs.thunderbird-bin else pkgs.thunderbird;
in
{
  # Account definitions (email/calendar/contact) live in module.accounts.nix,
  # shared with evolution-data-server (module.evolution.nix). Only email
  # accounts opt in to Thunderbird; calendars and the address book are
  # consumed via GNOME/EDS instead, so Thunderbird is mail-only.
  programs.thunderbird = {
    enable = true;
    package = tbPkg;

    profiles.default = {
      isDefault = true;
      accountsOrder = [ "personal" ];

      settings = {
        "mail.chat.enabled" = false;
        "calendar.itip.showImipBar" = false;
        "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
      };

      # Hide the calendar/tasks/chat spaces so Thunderbird presents as an
      # email-only client. The address book space stays (local/collected
      # addresses + autocomplete still live there).
      userChrome = ''
        #calendarButton,
        #tasksButton,
        #chatButton {
          display: none !important;
        }
      '';
    };
  };
}