{
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";

    maunium-stickerpicker = {
      url = "github:maunium/stickerpicker";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, maunium-stickerpicker }: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
    fetchers = pkgs.callPackage ./fetchers.nix { };
    downloadStickers = pkgs.callPackage ./downloadStickers.nix {
      inherit maunium-stickerpicker fetchers;
      inherit (self.packages.${system}) stickerpicker-tools;
    };
  in {
    inherit downloadStickers;

    devShells.${system}.default = pkgs.mkShell {
      name = "python-venv";

      venvDir = "./.venv";

      buildInputs = [
        pkgs.python3Packages.python
        pkgs.python3Packages.venvShellHook
        self.packages.${system}.stickerpicker-tools
        self.packages.${system}.sigstickers
      ];

      postVenvCreation = ''
        unset SOURCE_DATE_EPOCH
        pip install -r requirements.txt
      '';

      postShellHook = ''
        # allow pip to install wheels
        unset SOURCE_DATE_EPOCH
      '';
    };

    packages.${system} =
    let
      signalstickers-client = (pkgs.python3Packages.callPackage ./python/signalstickers-client.nix {});
    in
    {
      default = self.packages.${system}.stickerpicker-tools;
      sigstickers = (pkgs.python3Packages.callPackage ./python/sigstickers.nix { inherit signalstickers-client; });

      pub-solar-stickers = downloadStickers {
        homeserver = "https://matrix.pub.solar";
        userId = "@hakkonaut:pub.solar";
        sha256 = "sha256-e5KNPhtrETzgcJxbVZtlWwBXK3RlNKXCZPPZ5Zk46ok=";
        packs = [
          {
            type = "chatsticker";
            name = "donald-and-friends";
          }
          {
            type = "chatsticker";
            name = "heartwarming-cat-world";
          }
          {
            type = "chatsticker";
            name = "kawaii-potato-1";
          }
        ];
      };

      stickerpicker-tools = pkgs.python3Packages.buildPythonPackage {
        name = "stickerpicker-tools";
        src = maunium-stickerpicker;

        propagatedBuildInputs = with pkgs.python3Packages; [
          aiohttp
          yarl
          pillow
          telethon
          cryptg
          python-magic
          pkgs.cacert
        ];
        doCheck = false;
      };
    };
  };
}