class Pypy3 < Formula
  desc "Implementation of Python 3 in Python"
  homepage "https://pypy.org/"
  url "https://bitbucket.org/pypy/pypy/downloads/pypy3-v5.8.0-src.tar.bz2"
  sha256 "9d090127335c3c0fd2b14c8835bf91752e62756e55ea06aad3353f24a6854223"

  bottle do
    cellar :any
    sha256 "b920928cda269be813f3cc318c886a07884dfa0e7d4ec927d94f10405c416ea2" => :high_sierra
    sha256 "26f9144094f59090bd3b0b088ec98657a1e7789de85f03e718ff65482afd6eb3" => :sierra
    sha256 "a757bfa2f53ec30203d53152fc63da08629a20081d9f4d1bdb61680cbe70a465" => :el_capitan
    sha256 "10c9e6cbeb86595d35283f5752b89f88844a2f66cfa1b8ac424ff1ecb2dd54a7" => :yosemite
  end

  option "without-bootstrap", "Translate Pypy with system Python instead of " \
                              "downloading a Pypy binary distribution to " \
                              "perform the translation (adds 30-60 minutes " \
                              "to build)"

  depends_on :arch => :x86_64
  depends_on "pkg-config" => :build
  depends_on "gdbm" => :recommended
  depends_on "sqlite" => :recommended
  depends_on "openssl"
  depends_on "xz" => :recommended

  resource "bootstrap" do
    url "https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.8.0-osx64.tar.bz2"
    sha256 "04b61d1cf13aaca6d0420e854c820b8bd049dc88be16c02542abe8ca26eb075c"
  end

  # packaging depends on pyparsing
  resource "pyparsing" do
    url "https://files.pythonhosted.org/packages/3c/ec/a94f8cf7274ea60b5413df054f82a8980523efd712ec55a59e7c3357cf7c/pyparsing-2.2.0.tar.gz"
    sha256 "0832bcf47acd283788593e7a0f542407bd9550a55a8a8435214a1960e04bcb04"
  end

  # packaging and setuptools depend on six
  resource "six" do
    url "https://files.pythonhosted.org/packages/b3/b2/238e2590826bfdd113244a40d9d3eb26918bd798fc187e2360a8367068db/six-1.10.0.tar.gz"
    sha256 "105f8d68616f8248e24bf0e9372ef04d3cc10104f1980f54d57b2ce73a5ad56a"
  end

  # setuptools depends on packaging
  resource "packaging" do
    url "https://files.pythonhosted.org/packages/c6/70/bb32913de251017e266c5114d0a645f262fb10ebc9bf6de894966d124e35/packaging-16.8.tar.gz"
    sha256 "5d50835fdf0a7edf0b55e311b7c887786504efea1177abd7e69329a8e5ea619e"
  end

  # setuptools depends on appdirs
  resource "appdirs" do
    url "https://files.pythonhosted.org/packages/48/69/d87c60746b393309ca30761f8e2b49473d43450b150cb08f3c6df5c11be5/appdirs-1.4.3.tar.gz"
    sha256 "9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92"
  end

  resource "setuptools" do
    url "https://files.pythonhosted.org/packages/a9/23/720c7558ba6ad3e0f5ad01e0d6ea2288b486da32f053c73e259f7c392042/setuptools-36.0.1.zip"
    sha256 "e17c4687fddd6d70a6604ac0ad25e33324cec71b5137267dd5c45e103c4b288a"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/11/b6/abcb525026a4be042b486df43905d6893fb04f05aac21c32c638e939e447/pip-9.0.1.tar.gz"
    sha256 "09f243e1a7b461f654c26a725fa373211bb7ff17a9300058b205c61658ca940d"
  end

  resource "pycparser" do
    url "https://files.pythonhosted.org/packages/be/64/1bb257ffb17d01f4a38d7ce686809a736837ad4371bcc5c42ba7a715c3ac/pycparser-2.17.tar.gz"
    sha256 "0aac31e917c24cb3357f5a4d5566f2cc91a19ca41862f6c3c22dc60a629673b6"
  end

  # https://bugs.launchpad.net/ubuntu/+source/gcc-4.2/+bug/187391
  fails_with :gcc

  def install
    # Having PYTHONPATH set can cause the build to fail if another
    # Python is present, e.g. a Homebrew-provided Python 2.x
    # See https://github.com/Homebrew/homebrew/issues/24364
    ENV["PYTHONPATH"] = ""
    ENV["PYPY_USESSION_DIR"] = buildpath

    python = "python"
    if build.with?("bootstrap") && MacOS.prefer_64_bit?
      resource("bootstrap").stage buildpath/"bootstrap"
      python = buildpath/"bootstrap/bin/pypy"
    end

    # PyPy 5.7.1 needs either cffi or pycparser to build
    if build.without?("bootstrap")
      %w[pycparser].each do |pkg|
        resource(pkg).stage buildpath/"pycparser"
        ENV.append "PYTHONPATH", buildpath/"pycparser"
      end
    end

    cd "pypy/goal" do
      system python, buildpath/"rpython/bin/rpython",
             "-Ojit", "--shared", "--cc", ENV.cc, "--verbose",
             "--make-jobs", ENV.make_jobs, "targetpypystandalone.py"
    end

    libexec.mkpath
    cd "pypy/tool/release" do
      package_args = %w[--archive-name pypy3 --targetdir . --nostrip]
      package_args << "--without-gdbm" if build.without? "gdbm"
      package_args << "--without-lzma" if build.without? "xz"
      system python, "package.py", *package_args
      system "tar", "-C", libexec.to_s, "--strip-components", "1", "-xzf", "pypy3.tar.bz2"
    end

    (libexec/"lib").install libexec/"bin/libpypy3-c.dylib" => "libpypy3-c.dylib"

    MachO::Tools.change_install_name("#{libexec}/bin/pypy3",
                                     "@rpath/libpypy3-c.dylib",
                                     "#{libexec}/lib/libpypy3-c.dylib")
    MachO::Tools.change_dylib_id("#{libexec}/lib/libpypy3-c.dylib",
                                 "#{opt_libexec}/lib/libpypy3-c.dylib")

    (libexec/"lib-python").install "lib-python/3"
    libexec.install %w[include lib_pypy]

    # The PyPy binary install instructions suggest installing somewhere
    # (like /opt) and symlinking in binaries as needed. Specifically,
    # we want to avoid putting PyPy's Python.h somewhere that configure
    # scripts will find it.
    bin.install_symlink libexec/"bin/pypy3"
    bin.install_symlink libexec/"bin/pypy3.5"
    lib.install_symlink libexec/"lib/libpypy3-c.dylib"
  end

  def post_install
    # Precompile cffi extensions in lib_pypy
    # list from create_cffi_import_libraries in pypy/tool/release/package.py
    %w[_sqlite3 _curses syslog gdbm _tkinter].each do |module_name|
      quiet_system bin/"pypy3", "-c", "import #{module_name}"
    end

    # Post-install, fix up the site-packages and install-scripts folders
    # so that user-installed Python software survives minor updates, such
    # as going from 1.7.0 to 1.7.1.

    # Create a site-packages in the prefix.
    prefix_site_packages.mkpath

    # Symlink the prefix site-packages into the cellar.
    libexec.install_symlink prefix_site_packages

    # Tell distutils-based installers where to put scripts
    scripts_folder.mkpath
    (distutils+"distutils.cfg").atomic_write <<-EOF.undent
      [install]
      install-scripts=#{scripts_folder}
    EOF

    %w[appdirs pyparsing six packaging setuptools pip].each do |pkg|
      resource(pkg).stage do
        system bin/"pypy3", "-s", "setup.py", "install", "--force", "--verbose"
      end
    end

    # Symlinks to easy_install_pypy3 and pip_pypy3
    bin.install_symlink scripts_folder/"easy_install" => "easy_install_pypy3"
    bin.install_symlink scripts_folder/"pip" => "pip_pypy3"

    # post_install happens after linking
    %w[easy_install_pypy3 pip_pypy3].each { |e| (HOMEBREW_PREFIX/"bin").install_symlink bin/e }
  end

  def caveats; <<-EOS.undent
    A "distutils.cfg" has been written to:
      #{distutils}
    specifying the install-scripts folder as:
      #{scripts_folder}

    If you install Python packages via "pypy3 setup.py install", easy_install_pypy3,
    or pip_pypy3, any provided scripts will go into the install-scripts folder
    above, so you may want to add it to your PATH *after* #{HOMEBREW_PREFIX}/bin
    so you don't overwrite tools from CPython.

    Setuptools and pip have been installed, so you can use easy_install_pypy3 and
    pip_pypy3.
    To update pip and setuptools between pypy3 releases, run:
        pip_pypy3 install --upgrade pip setuptools

    See: https://docs.brew.sh/Homebrew-and-Python.html
    EOS
  end

  # The HOMEBREW_PREFIX location of site-packages
  def prefix_site_packages
    HOMEBREW_PREFIX+"lib/pypy3/site-packages"
  end

  # Where setuptools will install executable scripts
  def scripts_folder
    HOMEBREW_PREFIX+"share/pypy3"
  end

  # The Cellar location of distutils
  def distutils
    libexec+"lib-python/3/distutils"
  end

  test do
    system bin/"pypy3", "-c", "print('Hello, world!')"
    system scripts_folder/"pip", "list"
  end
end