{
  pkgs,
  config,
  lib,
  ...
}:
with lib;
with builtins; let
  formatter-env = with pkgs;
    bundlerEnv {
      name = "Gem dependencies";
      inherit ruby_3_2;
      ruby = ruby_3_2;
      gemdir = ./.;
      #gemConfig =
      #  pkgs.defaultGemConfig
      #  // {
      #    nokogiri = attrs: {
      #      buildFlags = ["--use-system-libraries"]; # "--with-zlib-include=${pkgs.zlib}/include/libxml2"];
      #};
      #  };
    };

  #format-env = pkgs.callPackage ./format-derivation.nix {inherit pkgs;};
  cfg = config.vim.languages.ruby;

  defaultServer = "rubyserver";
  servers = {
    rubyserver = {
      package = pkgs.rubyPackages_3_2.solargraph.overrideAttrs (
        fa: oa: {
          buildInputs = oa.buildInputs ++ [formatter-env];
        }
      );
      lspConfig = ''
        lspconfig.solargraph.setup {
          capabilities = capabilities,
          on_attach = attach_keymaps,
          --cmd = { "${pkgs.ruby_3_2}/bin/bundle exec solargraph", "stdio" }
          cmd = { "${cfg.lsp.package}/bin/solargraph", "stdio" },
            settings = {
              solargraph = {
              diagnostics = true,
              autoformat = true,
              -- bundlerPath = "${pkgs.ruby_3_2}/bin/bundler",
              completion = true,
              formatting = true,
              logLevel = "debug",
              references = true,
              useBundler = false
            }
          }
        }

      '';
    };
  };

  # TODO: specify packages
  defaultFormat = "rubocop";
  formats = {
    rubocop = {
      package = pkgs.rubyPackages_3_2.rubocop.overrideAttrs (
        fa: oa: {
          buildInputs = oa.buildInputs ++ [formatter-env];
        }
      );
      nullConfig = ''
                lspconfig.rubocop.setup {
                 on_attach = attach_keymaps,
                  cmd = { "${cfg.format.package}/bin/rubocop", "--require", "${formatter-env}/lib/ruby/gems/3.2.0/gems/rubocop-rails-2.20.2/lib/rubocop-rails.rb"} --, nls.builtins.formatting.rubocop._opts.args }
                }
         --       local conditional = function(fn)
         --         local utils = require("null-ls.utils").make_conditional_utils()
         --         return fn(utils)
         --       end
         --
        --        table.insert(
        --          ls_sources,
        --                     null_ls.builtins.formatting.rubocop.with({
        --                         command = "${cfg.format.package}/bin/rubocop",
        --                      args = { "--require", "${formatter-env}/lib/ruby/gems/3.2.0/gems/rubocop-rails-2.20.2/lib/rubocop-rails.rb"}
        --                     })
        --                     )
         --                    or null_ls.builtins.formatting.rubocop.with({
         --                      command = "${cfg.format.package}/bin/rubocop",
         --                 })
         --          end)
         --       )
      '';
    };
  };
  # TODO: specify packages
  #  defaultDiagnostics = ["rubocop"];
  #  diagnostics = {
  #    rubocop = {
  #      package = pkgs.rubyPackages_3_2.rubocop;
  #      nullConfig = pkg: ''
  #        table.insert(
  #          ls_sources,
  #          null_ls.builtins.diagnostics.rubocop.with({
  #            command = "${lib.getExe pkg}",
  #          })
  #        )
  #      '';
  # };
  # };
in {
  options.vim.languages.ruby = {
    enable = mkEnableOption "Ruby/Ruby on Rails language support";

    treesitter = {
      enable = mkEnableOption "Enable Ruby treesitter" // {default = config.vim.languages.enableTreesitter;};
      rubyPackage = nvim.types.mkGrammarOption pkgs "ruby";
    };

    lsp = {
      enable = mkEnableOption "Enable Ruby/Ruby on Rails LSP support" // {default = config.vim.languages.enableLSP;};

      server = mkOption {
        description = "Ruby/RoR LSP server to use";
        type = with types; enum (attrNames servers);
        default = defaultServer;
      };

      package = mkOption {
        description = "Ruby/RoR LSP server package";
        type = types.package;
        default = servers.${cfg.lsp.server}.package;
      };
    };

    format = {
      enable = mkEnableOption "Enable Ruby/RoR formatting" // {default = config.vim.languages.enableFormat;};

      type = mkOption {
        description = "Ruby/RoR formatter to use";
        type = with types; enum (attrNames formats);
        default = defaultFormat;
      };

      package = mkOption {
        description = "Ruby/RoR formatter package";
        type = types.package;
        default = formats.${cfg.format.type}.package;
      };
    };

    #    extraDiagnostics = {
    # enable = mkEnableOption "Enable extra Ruby/RoR diagnostics" // {default = config.vim.languages.enableExtraDiagnostics;};

    #      types = lib.nvim.types.diagnostics {
    #        langDesc = "Ruby/RoR";
    #        inherit diagnostics;
    #        inherit defaultDiagnostics;
    #      };
    #    };
  };

  config = mkIf cfg.enable (mkMerge [
    (mkIf cfg.treesitter.enable {
      vim.treesitter.enable = true;
      vim.treesitter.grammars = [cfg.treesitter.rubyPackage];
    })

    (mkIf cfg.lsp.enable {
      vim.lsp.lspconfig.enable = true;
      vim.lsp.lspconfig.sources.ruby-lsp = servers.${cfg.lsp.server}.lspConfig;
    })

    (mkIf cfg.format.enable {
      vim.lsp.null-ls.enable = true;
      vim.lsp.null-ls.sources.ruby-format = formats.${cfg.format.type}.nullConfig;
    })

    #   (mkIf cfg.extraDiagnostics.enable {
    #     vim.lsp.null-ls.enable = true;
    #     vim.lsp.null-ls.sources = lib.nvim.languages.diagnosticsToLua {
    #       lang = "ruby";
    #       config = cfg.extraDiagnostics.types;
    #       inherit diagnostics;
    #     };
    #   })
  ]);
}