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-4.26.0.tgz"
  sha256 "38d0964d87c6cd261ef5bf146f7a396da8733ad3f088c1f60d553eaffae82dff"
  head "https://github.com/webpack/webpack.git"

  bottle do
    sha256 "e26ded816b4f71ae205fe63115cdfb2851ec9b1fad9ec3246a79ff67a0079eb3" => :mojave
    sha256 "4ecbae5bbfd8f3fa1db7a4f6e93d9d1219e7801d7266082eb575f3516b97e98b" => :high_sierra
    sha256 "57783a916507ca6ce163e80ad568c66bbc468fd7077805c71d05db19c31bd741" => :sierra
  end

  depends_on "node"

  resource "webpack-cli" do
    url "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.1.2.tgz"
    sha256 "135962a43cdec4d24f68925c32e4daea600d6433d7b8fb912a9709a65712411e"
  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