require "language/node"
require "json"

class Webpack < Formula
  desc "Bundler for JavaScript and friends"
  homepage "https://webpack.js.org/"
  url "https://registry.npmjs.org/webpack/-/webpack-4.39.1.tgz"
  sha256 "d3458a829d6884cbc800ef8b9ad2ee0b9e2bb96727494eaee338fb7ef1ab5386"
  head "https://github.com/webpack/webpack.git"

  bottle do
    sha256 "887fa16cc4cc3bfb244462ca1ece622ec6ee1986a1f4e946ea2a2a8ccf5917ba" => :mojave
    sha256 "15d1718cf0dfd5c120cb36879d3b9f8d859ba14b91bec03ca0a1e20007f6d918" => :high_sierra
    sha256 "47f66a5d1e6859090950ea106ba93b51a6d5a4ad52fe21765645a1ef4fe13144" => :sierra
  end

  depends_on "node"

  resource "webpack-cli" do
    url "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.5.tgz"
    sha256 "60254336b5994487f58712714b1b1a475e74dc1d0b3b3e609086096f445b1818"
  end

  def install
    (buildpath/"node_modules/webpack").install Dir["*"]
    buildpath.install resource("webpack-cli")

    # declare webpack as a bundledDependency of webpack-cli
    pkg_json = JSON.parse(IO.read("package.json"))
    pkg_json["dependencies"]["webpack"] = version
    pkg_json["bundledDependencies"] = ["webpack"]
    IO.write("package.json", JSON.pretty_generate(pkg_json))

    system "npm", "install", *Language::Node.std_npm_install_args(libexec)

    bin.install_symlink libexec/"bin/webpack-cli"
    bin.install_symlink libexec/"bin/webpack-cli" => "webpack"
  end

  test do
    (testpath/"index.js").write <<~EOS
      function component () {
        var element = document.createElement('div');
        element.innerHTML = 'Hello' + ' ' + 'webpack';
        return element;
      }

      document.body.appendChild(component());
    EOS

    system bin/"webpack", "index.js", "--output=bundle.js"
    assert_predicate testpath/"bundle.js", :exist?, "bundle.js was not generated"
  end
end