class Node < Formula
  desc "Platform built on the V8 JavaScript runtime to build network applications"
  homepage "https://nodejs.org/"
  url "https://nodejs.org/dist/v5.7.1/node-v5.7.1.tar.xz"
  sha256 "029ed8aeb997c68d1a901cd837af02d24b6b5e20a4ff93bed090fd289f91a9a1"
  head "https://github.com/nodejs/node.git"

  bottle do
    sha256 "9ea30f15633d87b6abaea3d9e724e1af14795fdb37e693844a53eb0bfac653e5" => :el_capitan
    sha256 "5b415bc3f2c5c7638e56fb5840bbcbaa64e49f695e1e0a1e4d27914227d275f0" => :yosemite
    sha256 "4b12421992a0113afaa41cf287b3783d107c60069c5590a4db73419848d51861" => :mavericks
  end

  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)"

  deprecated_option "enable-debug" => "with-debug"
  deprecated_option "with-icu4c" => "with-full-icu"

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

  # Per upstream - "Need g++ 4.8 or clang++ 3.4".
  fails_with :clang if MacOS.version <= :snow_leopard
  fails_with :llvm
  fails_with :gcc_4_0
  fails_with :gcc
  ("4.3".."4.7").each do |n|
    fails_with :gcc => n
  end

  # We track major/minor from upstream Node releases.
  # We will accept *important* npm patch releases when necessary.
  # https://github.com/Homebrew/homebrew/pull/46098#issuecomment-157802319
  resource "npm" do
    url "https://registry.npmjs.org/npm/-/npm-3.6.0.tgz"
    sha256 "e686676c9d6db00f43f415998a8e0f47f415549f850f4b86ffdc7d7677db70e0"
  end

  resource "icu4c" do
    url "https://ssl.icu-project.org/files/icu4c/56.1/icu4c-56_1-src.tgz"
    mirror "https://ftp.mirrorservice.org/sites/download.qt-project.org/development_releases/prebuilt/icu/src/icu4c-56_1-src.tgz"
    version "56.1"
    sha256 "3a64e9105c734dcf631c0b3ed60404531bce6c0f5a64bfe1a6402a4cc2314816"
  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

    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

    if build.without? "full-icu"
      s += <<-EOS.undent
        Please note by default only English locale support is provided. If you need
        full locale support you should:
          `brew reinstall node --with-full-icu`
      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().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
      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"
    end
  end
end