class Stackless < Formula
  desc "Interpreted, interactive, object-oriented programming language"
  homepage "http://www.stackless.com"
  url 'http://www.stackless.com/binaries/stackless-375-export.tar.xz'
  sha256 "a2cfe3866f7c512660ab69c252c454ed596ebc117a4c637028934a2cec79759d"

  # setuptools remembers the build flags python is built with and uses them to
  # build packages later. Xcode-only systems need different flags.
  pour_bottle? do
    reason <<~EOS
      The bottle needs the Apple Command Line Tools to be installed.
        You can install them, if desired, with:
          xcode-select --install
    EOS
    satisfy { MacOS::CLT.installed? }
  end

  depends_on "pkg-config" => :build
  depends_on "gdbm"
  depends_on "openssl@1.1"
  depends_on "readline"
  depends_on "sqlite"
  depends_on "xz"

  uses_from_macos "bzip2"
  uses_from_macos "libffi"
  uses_from_macos "ncurses"
  uses_from_macos "zlib"

  skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5", "bin/pip-3.6", "bin/pip-3.7"
  skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5",
             "bin/easy_install-3.6", "bin/easy_install-3.7"

  resource "setuptools" do
    url "https://files.pythonhosted.org/packages/df/ed/bea598a87a8f7e21ac5bbf464102077c7102557c07db9ff4e207bd9f7806/setuptools-46.0.0.zip"
    sha256 "2f00f25b780fbfd0787e46891dcccd805b08d007621f24629025f48afef444b5"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/8e/76/66066b7bc71817238924c7e4b448abdb17eb0c92d645769c223f9ace478f/pip-20.0.2.tar.gz"
    sha256 "7db0c8ea4c7ea51c8049640e8e6e7fde949de672bfa4949920675563a5a6967f"
  end

  resource "wheel" do
    url "https://files.pythonhosted.org/packages/75/28/521c6dc7fef23a68368efefdcd682f5b3d1d58c2b90b06dc1d0b805b51ae/wheel-0.34.2.tar.gz"
    sha256 "8788e9155fe14f54164c1b9eb0a319d98ef02c160725587ad60f14ddc57b6f96"
  end

  resource "importlib-metadata" do
    url "https://files.pythonhosted.org/packages/56/1f/74c3e29389d34feea2d62ba3de1169efea2566eb22e9546d379756860525/importlib_metadata-2.0.0.tar.gz"
    sha256 "77a540690e24b0305878c37ffd421785a6f7e53c8b5720d211b211de8d0e95da"
  end

  resource "zipp" do
    url "https://files.pythonhosted.org/packages/ce/b0/757db659e8b91cb3ea47d90350d7735817fe1df36086afc77c1c4610d559/zipp-3.4.0.tar.gz"
    sha256 "ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"
  end

  if MacOS.version >= :big_sur
    # Patch for Big Sur see
    # https://github.com/python/cpython/pull/23556
    patch do
      url "https://raw.githubusercontent.com/Alzakath/homebrew-stackless/master/stackless_pull_23556.patch"
      sha256 "e76a130ac528d5caf85d289c8f90678a222c8305002ffcf9462e32da35755084"
    end
  end

  def install
    # Unset these so that installing pip and setuptools puts them where we want
    # and not into some other Python the user has installed.
    ENV["PYTHONHOME"] = nil
    ENV["PYTHONPATH"] = nil

    xy = (buildpath/"configure.ac").read.slice(/PYTHON_VERSION, (3\.\d)/, 1)
    lib_cellar = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}"

    args = %W[
      --prefix=#{prefix}
      --enable-ipv6
      --datarootdir=#{share}
      --datadir=#{share}
      --enable-framework=#{frameworks}
      --enable-loadable-sqlite-extensions
      --without-ensurepip
      --with-dtrace
      --with-openssl=#{Formula["openssl@1.1"].opt_prefix}
    ]

    args << "--without-gcc" if ENV.compiler == :clang

    cflags   = []
    ldflags  = []
    cppflags = []

    if MacOS.sdk_path_if_needed
      # Help Python's build system (setuptools/pip) to build things on SDK-based systems
      # The setup.py looks at "-isysroot" to get the sysroot (and not at --sysroot)
      cflags  << "-isysroot #{MacOS.sdk_path}" << "-I#{MacOS.sdk_path}/usr/include"
      ldflags << "-isysroot #{MacOS.sdk_path}"
      # For the Xlib.h, Python needs this header dir with the system Tk
      # Yep, this needs the absolute path where zlib needed a path relative
      # to the SDK.
      cflags << "-I#{MacOS.sdk_path}/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers"
    end
    # Avoid linking to libgcc https://mail.python.org/pipermail/python-dev/2012-February/116205.html
    args << "MACOSX_DEPLOYMENT_TARGET=#{MacOS.version}"

    # We want our readline! This is just to outsmart the detection code,
    # superenv makes cc always find includes/libs!
    inreplace "setup.py",
      "do_readline = self.compiler.find_library_file(lib_dirs, 'readline')",
      "do_readline = '#{Formula["readline"].opt_lib}/libhistory.dylib'"

    inreplace "setup.py" do |s|
      s.gsub! "sqlite_setup_debug = False", "sqlite_setup_debug = True"
      s.gsub! "for d_ in inc_dirs + sqlite_inc_paths:",
              "for d_ in ['#{Formula["sqlite"].opt_include}']:"
    end

    # Allow python modules to use ctypes.find_library to find homebrew's stuff
    # even if homebrew is not a /usr/local/lib. Try this with:
    # `brew install enchant && pip install pyenchant`
    inreplace "./Lib/ctypes/macholib/dyld.py" do |f|
      f.gsub! "DEFAULT_LIBRARY_FALLBACK = [", "DEFAULT_LIBRARY_FALLBACK = [ '#{HOMEBREW_PREFIX}/lib',"
      f.gsub! "DEFAULT_FRAMEWORK_FALLBACK = [", "DEFAULT_FRAMEWORK_FALLBACK = [ '#{HOMEBREW_PREFIX}/Frameworks',"
    end

    args << "CFLAGS=#{cflags.join(" ")}" unless cflags.empty?
    args << "LDFLAGS=#{ldflags.join(" ")}" unless ldflags.empty?
    args << "CPPFLAGS=#{cppflags.join(" ")}" unless cppflags.empty?

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

    ENV.deparallelize do
      # Tell Python not to install into /Applications (default for framework builds)
      system "make", "install", "PYTHONAPPSDIR=#{prefix}"
      system "make", "frameworkinstallextras", "PYTHONAPPSDIR=#{pkgshare}"
    end

    # Any .app get a " 3" attached, so it does not conflict with python 2.x.
    Dir.glob("#{prefix}/*.app") { |app| mv app, app.sub(/\.app$/, " 3.app") }

    # Prevent third-party packages from building against fragile Cellar paths
    inreplace Dir[lib_cellar/"**/_sysconfigdata_m_darwin_darwin.py",
                  lib_cellar/"config*/Makefile",
                  frameworks/"Python.framework/Versions/3*/lib/pkgconfig/python-3.?.pc"],
              prefix, opt_prefix

    # Help third-party packages find the Python framework
    inreplace Dir[lib_cellar/"config*/Makefile"],
              /^LINKFORSHARED=(.*)PYTHONFRAMEWORKDIR(.*)/,
              "LINKFORSHARED=\\1PYTHONFRAMEWORKINSTALLDIR\\2"

    # Fix for https://github.com/Homebrew/homebrew-core/issues/21212
    inreplace Dir[lib_cellar/"**/_sysconfigdata_m_darwin_darwin.py"],
              %r{('LINKFORSHARED': .*?)'(Python.framework/Versions/3.\d+/Python)'}m,
              "\\1'#{opt_prefix}/Frameworks/\\2'"

    # Symlink the pkgconfig files into HOMEBREW_PREFIX so they're accessible.
    (lib/"pkgconfig").install_symlink Dir["#{frameworks}/Python.framework/Versions/#{xy}/lib/pkgconfig/*"]

    # Remove the site-packages that Python created in its Cellar.
    (prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/site-packages").rmtree

    %w[setuptools pip wheel importlib-metadata zipp].each do |r|
      (libexec/r).install resource(r)
    end

    # Remove wheel test data.
    # It's for people editing wheel and contains binaries which fail `brew linkage`.
    rm libexec/"wheel/tox.ini"
    rm_r libexec/"wheel/tests"

    # Install unversioned symlinks in libexec/bin.
    {
      "idle"          => "idle3",
      "pydoc"         => "pydoc3",
      "python"        => "python3",
      "python-config" => "python3-config",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end
  end

  def post_install
    ENV.delete "PYTHONPATH"

    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    site_packages = HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"
    site_packages_cellar = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/site-packages"

    # Fix up the site-packages so that user-installed Python software survives
    # minor updates, such as going from 3.3.2 to 3.3.3:

    # Create a site-packages in HOMEBREW_PREFIX/lib/python#{xy}/site-packages
    site_packages.mkpath

    # Symlink the prefix site-packages into the cellar.
    site_packages_cellar.unlink if site_packages_cellar.exist?
    site_packages_cellar.parent.install_symlink site_packages

    # Write our sitecustomize.py
    rm_rf Dir["#{site_packages}/sitecustomize.py[co]"]
    (site_packages/"sitecustomize.py").atomic_write(sitecustomize)

    # Remove old setuptools installations that may still fly around and be
    # listed in the easy_install.pth. This can break setuptools build with
    # zipimport.ZipImportError: bad local file header
    # setuptools-0.9.8-py3.3.egg
    rm_rf Dir["#{site_packages}/setuptools*"]
    rm_rf Dir["#{site_packages}/distribute*"]
    rm_rf Dir["#{site_packages}/pip[-_.][0-9]*", "#{site_packages}/pip"]

    %w[setuptools pip wheel importlib-metadata zipp].each do |pkg|
      (libexec/pkg).cd do
        system bin/"python3", "-s", "setup.py", "--no-user-cfg", "install",
               "--force", "--verbose", "--install-scripts=#{bin}",
               "--install-lib=#{site_packages}",
               "--single-version-externally-managed",
               "--record=installed.txt"
      end
    end

    rm_rf [bin/"pip", bin/"easy_install"]
    mv bin/"wheel", bin/"wheel3"

    # Install unversioned symlinks in libexec/bin.
    {
      "easy_install" => "easy_install-#{xy}",
      "pip"          => "pip3",
      "wheel"        => "wheel3",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end

    # Help distutils find brewed stuff when building extensions
    include_dirs = [HOMEBREW_PREFIX/"include", Formula["openssl@1.1"].opt_include,
                    Formula["sqlite"].opt_include]
    library_dirs = [HOMEBREW_PREFIX/"lib", Formula["openssl@1.1"].opt_lib,
                    Formula["sqlite"].opt_lib]

    cfg = prefix/"Frameworks/Python.framework/Versions/#{xy}/lib/python#{xy}/distutils/distutils.cfg"

    cfg.atomic_write <<~EOS
      [install]
      prefix=#{HOMEBREW_PREFIX}

      [build_ext]
      include_dirs=#{include_dirs.join ":"}
      library_dirs=#{library_dirs.join ":"}
    EOS
  end

  def sitecustomize
    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s

    <<~EOS
      # This file is created by Homebrew and is executed on each python startup.
      # Don't print from here, or else python command line scripts may fail!
      # <https://docs.brew.sh/Homebrew-and-Python>
      import re
      import os
      import sys

      if sys.version_info[0] != 3:
          # This can only happen if the user has set the PYTHONPATH for 3.x and run Python 2.x or vice versa.
          # Every Python looks at the PYTHONPATH variable and we can't fix it here in sitecustomize.py,
          # because the PYTHONPATH is evaluated after the sitecustomize.py. Many modules (e.g. PyQt4) are
          # built only for a specific version of Python and will fail with cryptic error messages.
          # In the end this means: Don't set the PYTHONPATH permanently if you use different Python versions.
          exit('Your PYTHONPATH points to a site-packages dir for Python 3.x but you are running Python ' +
               str(sys.version_info[0]) + '.x!\\n     PYTHONPATH is currently: "' + str(os.environ['PYTHONPATH']) + '"\\n' +
               '     You should `unset PYTHONPATH` to fix this.')

      # Only do this for a brewed python:
      if os.path.realpath(sys.executable).startswith('#{rack}'):
          # Shuffle /Library site-packages to the end of sys.path
          library_site = '/Library/Python/#{xy}/site-packages'
          library_packages = [p for p in sys.path if p.startswith(library_site)]
          sys.path = [p for p in sys.path if not p.startswith(library_site)]
          # .pth files have already been processed so don't use addsitedir
          sys.path.extend(library_packages)

          # the Cellar site-packages is a symlink to the HOMEBREW_PREFIX
          # site_packages; prefer the shorter paths
          long_prefix = re.compile(r'#{rack}/[0-9\._abrc]+/Frameworks/Python\.framework/Versions/#{xy}/lib/python#{xy}/site-packages')
          sys.path = [long_prefix.sub('#{HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"}', p) for p in sys.path]

          # Set the sys.executable to use the opt_prefix. Only do this if PYTHONEXECUTABLE is not
          # explicitly set and we are not in a virtualenv:
          if 'PYTHONEXECUTABLE' not in os.environ and sys.prefix == sys.base_prefix:
              sys.executable = '#{opt_bin}/python#{xy}'
    EOS
  end

  def caveats
    xy = if prefix.exist?
      (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    else
      version.to_s.slice(/(3\.\d)/) || "3.7"
    end
    <<~EOS
      Python has been installed as
        #{opt_bin}/python3

      Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
      `python3`, `python3-config`, `pip3` etc., respectively, have been installed into
        #{opt_libexec}/bin

      You can install Python packages with
        #{opt_bin}/pip3 install <package>
      They will install into the site-package directory
        #{HOMEBREW_PREFIX/"lib/python#{xy}/site-packages"}

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

  keg_only "avoid conflicts between CPython and Stackless"

  test do
    xy = (prefix/"Frameworks/Python.framework/Versions").children.min.basename.to_s
    # Check if sqlite is ok, because we build with --enable-loadable-sqlite-extensions
    # and it can occur that building sqlite silently fails if OSX's sqlite is used.
    system "#{bin}/python#{xy}", "-c", "import sqlite3"
    # Check if some other modules import. Then the linked libs are working.
    system "#{bin}/python#{xy}", "-c", "import tkinter; root = tkinter.Tk()"
    system "#{bin}/python#{xy}", "-c", "import _gdbm"
    system "#{bin}/python#{xy}", "-c", "import zlib"
    system bin/"pip3", "list", "--format=columns"
  end
end
