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

let
  nixos-cosmic = builtins.fetchGit {
    url = "https://github.com/lilyinstarlight/nixos-cosmic.git";
    # rev = "b61e7a0da2fa1d5f05d41e3db6386b2ac5f5079b";
  };

  unstablePkgs = import (builtins.fetchTarball "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz");

  cosmicPkgsMainDir = builtins.readDir "${nixos-cosmic}/pkgs";
  cosmicPkgsDirs = builtins.filter (v: cosmicPkgsMainDir."${v}" == "directory") (builtins.attrNames cosmicPkgsMainDir);
  cosmicPkgsOverlay = final: prev: builtins.listToAttrs (
    builtins.map (v: {name = v; value = final.callPackage "${nixos-cosmic}/pkgs/${v}/package.nix" {};}) cosmicPkgsDirs
  );

  cosmicPkgs = unstablePkgs {
    inherit (config.nixpkgs) config localSystem crossSystem;
    overlays = [ cosmicPkgsOverlay ];
  };
  finalOverlay = finial: prev: lib.filterAttrs (n: v: builtins.elem n cosmicPkgsDirs) cosmicPkgs;
in
{
  imports = [
    "${nixos-cosmic}/nixos/cosmic/module.nix"
  ];
  config = {
    services.xserver.desktopManager.cosmic.enable = true;
    nixpkgs.overlays = [ finalOverlay ];
    nix.settings = {
      substituters = [ "https://cosmic.cachix.org/" ];
      trusted-public-keys = [ "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE=" ];
    };
  };
  options = {
    cosmic-applets = lib.mkOption {default = pkgs.cosmic-applets;};
    cosmic-applibrary = lib.mkOption {default = pkgs.cosmic-applibrary;};
    cosmic-bg = lib.mkOption {default = pkgs.cosmic-bg;};
    cosmic-comp = lib.mkOption {default = pkgs.cosmic-comp;};
    cosmic-design-demo = lib.mkOption {default = pkgs.cosmic-design;};
    cosmic-edit = lib.mkOption {default = pkgs.cosmic-edit;};
    cosmic-files = lib.mkOption {default = pkgs.cosmic-files;};
    cosmic-icons = lib.mkOption {default = pkgs.cosmic-icons;};
    cosmic-launcher = lib.mkOption {default = pkgs.cosmic-launcher;};
    cosmic-notifications = lib.mkOption {default = pkgs.cosmic-notifications;};
    cosmic-osd = lib.mkOption {default = pkgs.cosmic-osd;};
    cosmic-panel = lib.mkOption {default = pkgs.cosmic-panel;};
    cosmic-protocols = lib.mkOption {default = pkgs.cosmic-protocols;};
    cosmic-randr = lib.mkOption {default = pkgs.cosmic-randr;};
    cosmic-screenshot = lib.mkOption {default = pkgs.cosmic-screenshot;};
    cosmic-session = lib.mkOption {default = pkgs.cosmic-session;};
    cosmic-settings = lib.mkOption {default = pkgs.cosmic-settings;};
    cosmic-settings-daemon = lib.mkOption {default = pkgs.cosmic-settings;};
    cosmic-term = lib.mkOption {default = pkgs.cosmic-term;};
    cosmic-workspaces-epoch = lib.mkOption {default = pkgs.cosmic-workspaces;};
    wrapCosmicAppsHook = lib.mkOption {default = pkgs.wrapCosmicAppsHook;};
    xdg-desktop-portal-cosmic = lib.mkOption {default = pkgs.xdg-desktop-portal-cosmic;};
  };
}