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-4.20.2.tgz"
  sha256 "7c35ffc4a322aeec899179c94e4d702a1c05f40c9665042d6e169375c7134b72"
  head "https://github.com/webpack/webpack.git"

  bottle do
    sha256 "6bf42d5028e1d04cd7f121734979f34056db7ec0cccbc0c2ce029f3d520bfa24" => :mojave
    sha256 "16402083de5772af60b6593e6edbd8eb58d02a9770689826c9853a0ec8be8d50" => :high_sierra
    sha256 "3694fec4bcf6935c08a939decfdd49f7df06045ee24d830b41cbec97fb7e29fd" => :sierra
  end

  depends_on "node"

  resource "webpack-cli" do
    url "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.1.0.tgz"
    sha256 "813af78013aed28a967d2227c17b9c81c4809ed68b4f324a22e703167ea01e73"
  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