{
  config,
  pkgs,
  lib,
  ...
}: let
  inherit (lib.options) mkEnableOption mkOption;
  inherit (lib.modules) mkIf mkMerge;
  inherit (lib.types) package;
  inherit (lib.nvim.types) mkGrammarOption;
  inherit (lib.lists) isList;
  inherit (lib.nvim.lua) expToLua;

  cfg = config.vim.languages.kotlin;
in {
  options.vim.languages.kotlin = {
    enable = mkEnableOption "kotlin/HCL support";

    treesitter = {
      enable = mkEnableOption "kotlin treesitter" // {default = config.vim.languages.enableTreesitter;};
      package = mkGrammarOption pkgs "kotlin";
    };

    lsp = {
      enable = mkEnableOption "kotlin LSP support (kotlin-ls)" // {default = config.vim.languages.enableLSP;};

      package = mkOption {
        description = "kotlin-ls package";
        type = package;
        default = pkgs.kotlin-language-server;
      };
    };
  };
  config = mkIf cfg.enable (mkMerge [
    (mkIf cfg.treesitter.enable {
      vim.treesitter.enable = true;
      vim.treesitter.grammars = [cfg.treesitter.package];
    })

    (mkIf cfg.lsp.enable {
      vim.lsp.lspconfig.enable = true;
      vim.lsp.lspconfig.sources.kotlin-ls = ''
        lspconfig.kotlinls.setup {
          capabilities = capabilities,
          on_attach=default_on_attach,
          cmd = ${
          if isList cfg.lsp.package
          then expToLua cfg.lsp.package
          else ''{"${cfg.lsp.package}/bin/kotlin-language-server"}''
        },
        }
      '';
    })
  ]);
}