{ pkgs, ... }:

{
  programs.neovim = {
    enable = true;
    defaultEditor = true;
    # TODO: refactor (some parts) to extraLuaConfig
    extraConfig = ''
      set title
      set mouse=a
      set nohlsearch
      set number
      let mapleader=","

      lua << EOF
        local config_file = os.getenv("HOME")..'/.local/share/nvim_color_scheme'
        local f = io.open(config_file, "r")
        if f ~= nil then
            local system_theme = f:read("*l")
            io.close(f)
            if system_theme then
                system_theme = system_theme:gsub("^%s+", ""):gsub("%s+$", "")
            end
            if system_theme == 'dark' then
                vim.cmd("set bg=dark")
            elseif system_theme == 'light' then
                vim.cmd("set bg=light")
            else
                print('warning: expected value "light" or "dark"')
                print('  got:', system_theme)
                print('  expected path:', config_file)
            end
        else
            print('warning: nvim color scheme not found')
            print('  expected path:', config_file)
        end
      EOF

      colorscheme catppuccin " catppuccin-latte, catppuccin-frappe, catppuccin-macchiato, catppuccin-mocha

      " netrw (dir listing) settings
      let g:netrw_liststyle = 3
      let g:netrw_banner = 0
      let g:netrw_browse_split = 3
      let g:netrw_winsize = 25  " % of page

      set listchars=tab:→\ ,space:·,nbsp:␣,trail:•,eol:¶,precedes:«,extends:»
      set clipboard+=unnamedplus

      " Replace-all is aliased to S.
      nnoremap S :%s//g<Left><Left>

      " save file with ,w
      map <leader>w :w<cr><Space>

      " spellcheck
      set spell spelllang=en_us
      setlocal spell! spelllang=en_us
    '';

    plugins = with pkgs.vimPlugins; [
      vim-surround  # shortcuts for setting () {} etc.
      vim-gitgutter # git diff in sign column
      # vim-airline   # nice and light status bar # doesn't work nicely with tmux
      # coc-nvim coc-git coc-highlight coc-python coc-rls coc-vetur coc-vimtex coc-yaml coc-html coc-json # auto completion
      vim-nix       # nix highlight
      # vimtex        # latex stuff - disabled due to build check issue
      fzf-lua       # fuzzy finder through lua
      nerdtree      # file structure inside nvim
      rainbow       # color parenthesis
      # gruvbox-nvim  # theme
      catppuccin-nvim # theme
      goyo-vim      # write prose
      limelight-vim # prose paragraph highlighter
    ];
  };
}