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

let
  cfg = config.snowhawk.neovim;

  nightlyPackage = inputs.neovim-overlay.packages.${pkgs.system}.default;
in
{
  options.snowhawk.neovim = {
    enable = lib.mkEnableOption "neovim home-manager module";

    nightly = lib.mkEnableOption "nightly build of neovim";

    package = lib.mkPackageOption pkgs "neovim" {
      default = [ "neovim-unwrapped" ];
    };

    # This should be close to identical to above
    #
    # package = lib.mkOption {
    #   type = lib.types.package;
    #   default = pkgs.neovim-unwrapped;
    #   defaultText = lib.literalExpression "pkgs.neovim-unwrapped";
    #   description = "The package to use for the neovim binary.";
    # };
  };
  config =
    let
      nvim-treesitter = pkgs.vimPlugins.nvim-treesitter;
      treesitterWithGrammars = nvim-treesitter.withPlugins (_: nvim-treesitter.allGrammars);

      treesitter-parsers = pkgs.symlinkJoin {
        name = "treesitter-parsers";
        paths = treesitterWithGrammars.dependencies;
      };
    in
    lib.mkIf cfg.enable {
      snowhawk.neovim.package = lib.mkIf cfg.nightly (lib.mkDefault nightlyPackage);

      # Set nvim as manpager and default editor
      home.sessionVariables = {
        EDITOR = "nvim";
        MANPAGER = "nvim +Man!";
      };

      xdg.configFile."nvim/lua/parsers.lua".text = /* lua */ ''
        vim.opt.runtimepath:append ("${treesitter-parsers}")
      '';

      programs.neovim = {
        enable = true;
        coc.enable = false;
        package = cfg.package;
        withNodeJs = true;
        withPython3 = true;
        withRuby = true;

        plugins = [
          treesitterWithGrammars
        ];

        extraPackages = with pkgs; [
          nil
          nixpkgs-fmt
          rustup
          lua-language-server
          fzf
        ];
      };
    };
}