class NodeAT4 < Formula
  desc "Platform built on V8 to build network applications"
  homepage "https://nodejs.org/"
  url "https://nodejs.org/dist/v4.8.2/node-v4.8.2.tar.xz"
  sha256 "b961350b8490c791bdd3663925662ba0fbe01e004b43f1c2779baffcc816b930"
  head "https://github.com/nodejs/node.git", :branch => "v4.x-staging"

  bottle do
    sha256 "80d39c9b8459b5ddf40049b23a8eb1c53a9e6b7f39092dd56fbf0e36c12b9c08" => :sierra
    sha256 "d0da6b9665978a2cce3b5355a2b079738bc9716fe5d02cd22169fe53b7d6e364" => :el_capitan
    sha256 "2da3fe902a8daff3e6e01b0e09e3ae5ab30b819f940244318d57ca4e896528ed" => :yosemite
  end

  keg_only :versioned_formula

  option "with-debug", "Build with debugger hooks"
  option "without-npm", "npm will not be installed"
  option "without-completion", "npm bash completion will not be installed"
  option "with-full-icu", "Build with full-icu (all locales) instead of small-icu (English only)"

  depends_on :python => :build if MacOS.version <= :snow_leopard
  depends_on "pkg-config" => :build
  depends_on "openssl" => :optional

  # Keep in sync with main node formula
  resource "npm" do
    url "https://registry.npmjs.org/npm/-/npm-4.2.0.tgz"
    sha256 "bb9883f1581fd10854a8b6917ae1279f691a8d89e81a0cbea77b614dbcd53f5a"
  end

  resource "icu4c" do
    url "https://ssl.icu-project.org/files/icu4c/58.2/icu4c-58_2-src.tgz"
    version "58.2"
    sha256 "2b0a4410153a9b20de0e20c7d8b66049a72aef244b53683d0d7521371683da0c"
  end

  def install
    args = %W[--prefix=#{prefix} --without-npm]
    args << "--debug" if build.with? "debug"
    args << "--shared-openssl" if build.with? "openssl"

    if build.with? "full-icu"
      args << "--with-intl=full-icu"
    else
      args << "--with-intl=small-icu"
    end
    args << "--tag=head" if build.head?

    resource("icu4c").stage buildpath/"deps/icu"

    system "./configure", *args
    system "make", "install"

    if build.with? "npm"
      resource("npm").stage buildpath/"npm_install"

      # make sure npm can find node
      ENV.prepend_path "PATH", bin
      # set log level temporarily for npm's `make install`
      ENV["NPM_CONFIG_LOGLEVEL"] = "verbose"
      # unset prefix temporarily for npm's `make install`
      ENV.delete "NPM_CONFIG_PREFIX"

      cd buildpath/"npm_install" do
        system "./configure", "--prefix=#{libexec}/npm"
        system "make", "install"
        # `package.json` has relative paths to the npm_install directory.
        # This copies back over the vanilla `package.json` that is expected.
        # https://github.com/Homebrew/homebrew/issues/46131#issuecomment-157845008
        cp buildpath/"npm_install/package.json", libexec/"npm/lib/node_modules/npm"
        # Remove manpage symlinks from the buildpath, they are breaking bottle
        # creation. The real manpages are living in libexec/npm/lib/node_modules/npm/man/
        # https://github.com/Homebrew/homebrew/pull/47081#issuecomment-165280470
        rm_rf libexec/"npm/share/"
      end

      if build.with? "completion"
        bash_completion.install \
          buildpath/"npm_install/lib/utils/completion.sh" => "npm"
      end
    end
  end

  def post_install
    return if build.without? "npm"

    node_modules = HOMEBREW_PREFIX/"lib/node_modules"
    node_modules.mkpath
    npm_exec = node_modules/"npm/bin/npm-cli.js"
    # Kill npm but preserve all other modules across node updates/upgrades.
    rm_rf node_modules/"npm"

    cp_r libexec/"npm/lib/node_modules/npm", node_modules
    # This symlink doesn't hop into homebrew_prefix/bin automatically so
    # remove it and make our own. This is a small consequence of our bottle
    # npm make install workaround. All other installs **do** symlink to
    # homebrew_prefix/bin correctly. We ln rather than cp this because doing
    # so mimics npm's normal install.
    ln_sf npm_exec, "#{HOMEBREW_PREFIX}/bin/npm"

    # Let's do the manpage dance. It's just a jump to the left.
    # And then a step to the right, with your hand on rm_f.
    ["man1", "man3", "man5", "man7"].each do |man|
      # Dirs must exist first: https://github.com/Homebrew/homebrew/issues/35969
      mkdir_p HOMEBREW_PREFIX/"share/man/#{man}"
      rm_f Dir[HOMEBREW_PREFIX/"share/man/#{man}/{npm.,npm-,npmrc.,package.json.}*"]
      ln_sf Dir[libexec/"npm/lib/node_modules/npm/man/#{man}/{npm,package.json}*"], HOMEBREW_PREFIX/"share/man/#{man}"
    end

    npm_root = node_modules/"npm"
    npmrc = npm_root/"npmrc"
    npmrc.atomic_write("prefix = #{HOMEBREW_PREFIX}\n")
  end

  def caveats
    s = ""

    if build.without? "npm"
      s += <<-EOS.undent
        Homebrew has NOT installed npm. If you later install it, you should supplement
        your NODE_PATH with the npm module folder:
          #{HOMEBREW_PREFIX}/lib/node_modules
      EOS
    end

    s
  end

  test do
    path = testpath/"test.js"
    path.write "console.log('hello');"

    output = shell_output("#{bin}/node #{path}").strip
    assert_equal "hello", output
    output = shell_output("#{bin}/node -e 'console.log(new Intl.NumberFormat(\"en-EN\").format(1234.56))'").strip
    assert_equal "1,234.56", output

    if build.with? "npm"
      # make sure npm can find node
      ENV.prepend_path "PATH", opt_bin
      ENV.delete "NVM_NODEJS_ORG_MIRROR"
      assert_equal which("node"), opt_bin/"node"
      assert (HOMEBREW_PREFIX/"bin/npm").exist?, "npm must exist"
      assert (HOMEBREW_PREFIX/"bin/npm").executable?, "npm must be executable"
      system "#{HOMEBREW_PREFIX}/bin/npm", "--verbose", "install", "npm@latest"
      system "#{HOMEBREW_PREFIX}/bin/npm", "--verbose", "install", "bignum" unless head?
    end
  end
end