{ pkgs, config, lib, ... }:
with lib;
let
  cfg = config.plugins.packer;
  helpers = import ../helpers.nix { lib = lib; };
in
{
  options = {
    plugins.packer = {
      enable = mkEnableOption "Enable packer.nvim";

      plugins = mkOption {
        type = types.listOf (types.oneOf [
          types.str
          (with types; let
            mkOpt = type: desc: mkOption {
              type = nullOr type;
              default = null;
              description = desc;
            };
            function = attrsOf str;
          in
          types.submodule {
            options = {
              name = mkOption {
                type = str;
                description = "Name of the plugin to install";
              };

              disable = mkOpt bool "Mark plugin as inactive";
              as = mkOpt bool "Specifies an alias under which to install the plugin";
              installer = mkOpt function "A custom installer";
              updater = mkOpt function "A custom updater";
              after = mkOpt (oneOf [ str (listOf any) ]) "Plugins to load after this plugin";
              rtp = mkOpt str "Specifies a subdirectory of the plugin to add to runtimepath";
              opt = mkOpt str "Marks a plugin as optional";
              branch = mkOpt str "Git branch to use";
              tag = mkOpt str "Git tag to use";
              commit = mkOpt str "Git commit to use";
              lock = mkOpt bool "Skip this plugin in updates";
              run = mkOpt (oneOf [ str function ]) "Post-install hook";
              requires = mkOpt (oneOf [ str (listOf any) ]) "Plugin dependencies";
              rocks = mkOpt (oneOf [ str (listOf any) ]) "Luarocks dependencies";
              config = mkOpt (oneOf [ str function ]) "Code to run after this plugin is loaded";
              setup = mkOpt (oneOf [ str function ]) "Code to be run before this plugin is loaded";
              cmd = mkOpt (oneOf [ str (listOf str) ]) "Commands which load this plugin";
              ft = mkOpt (oneOf [ str (listOf str) ]) "Filetypes which load this plugin";
              keys = mkOpt (oneOf [ str (listOf str) ]) "Keymaps which load this plugin";
              event = mkOpt (oneOf [ str (listOf str) ]) "Autocommand events which load this plugin";
              fn = mkOpt (oneOf [ str (listOf str) ]) "Functions which load this plugin";
              cond = mkOpt (oneOf [ str function (listOf (oneOf [ str function ])) ]) "Conditional test to load this plugin";
              module = mkOpt (oneOf [ str (listOf str) ]) "Patterns of module names which load this plugin";
            };
          })
        ]);
        default = [ ];
        description = "List of plugins";
      };
    };
  };

  config = mkIf cfg.enable {
    extraPlugins = [ (pkgs.vimPlugins.packer-nvim.overrideAttrs (_: { pname = "packer.nvim"; })) ];
    extraPackages = [ pkgs.git ];

    extraConfigLua =
      let
        plugins = map
          (plugin:
            if isAttrs plugin then
              mapAttrs' (k: v: { name = if k == "name" then "@" else k; value = v; }) plugin
            else plugin)
          cfg.plugins;
        packedPlugins = if length plugins == 1 then head plugins else plugins;
      in
      mkIf (cfg.plugins != [ ]) ''
        require('packer').startup(function()
          use ${helpers.toLuaObject packedPlugins}
        end)
      '';
  };
}