class Numpy < Formula
  desc "Package for scientific computing with Python"
  homepage "http://www.numpy.org"
  url "https://files.pythonhosted.org/packages/0b/66/86185402ee2d55865c675c06a5cfef742e39f4635a4ce1b1aefd20711c13/numpy-1.14.2.zip"
  sha256 "facc6f925c3099ac01a1f03758100772560a0b020fb9d70f210404be08006bcb"

  bottle do
    sha256 "953c10a547b9af36436e7d31297fe2a15be912e3ae6bd70634957f9935bf6a8e" => :high_sierra
    sha256 "aa3a48369f9869f17cf44fb2f87a49bb76e0adf04fb5cee52a5d5d18e938b999" => :sierra
    sha256 "c22afeed38791bce599ff2b1c4263a90ed2ec08177396171e879ab4c70f3c3fb" => :el_capitan
  end

  head do
    url "https://github.com/numpy/numpy.git"

    resource "Cython" do
      url "https://files.pythonhosted.org/packages/ee/2a/c4d2cdd19c84c32d978d18e9355d1ba9982a383de87d0fcb5928553d37f4/Cython-0.27.3.tar.gz"
      sha256 "6a00512de1f2e3ce66ba35c5420babaef1fe2d9c43a8faab4080b0dbcc26bc64"
    end
  end

  option "without-python@2", "Build without python2 support"

  depends_on "gcc" => :build # for gfortran
  depends_on "python@2" => :recommended if MacOS.version <= :snow_leopard
  depends_on "python" => :recommended

  resource "nose" do
    url "https://files.pythonhosted.org/packages/58/a5/0dc93c3ec33f4e281849523a5a913fa1eea9a3068acfa754d44d88107a44/nose-1.3.7.tar.gz"
    sha256 "f1bffef9cbc82628f6e7d7b40d7e255aefaa1adb6a1b1d26c69a8b79e6208a98"
  end

  def install
    Language::Python.each_python(build) do |python, version|
      dest_path = lib/"python#{version}/site-packages"
      dest_path.mkpath

      nose_path = libexec/"nose/lib/python#{version}/site-packages"
      resource("nose").stage do
        system python, *Language::Python.setup_install_args(libexec/"nose")
        (dest_path/"homebrew-numpy-nose.pth").write "#{nose_path}\n"
      end

      if build.head?
        ENV.prepend_create_path "PYTHONPATH", buildpath/"tools/lib/python#{version}/site-packages"
        resource("Cython").stage do
          system python, *Language::Python.setup_install_args(buildpath/"tools")
        end
      end

      system python, "setup.py",
        "build", "--fcompiler=gnu95", "--parallel=#{ENV.make_jobs}",
        "install", "--prefix=#{prefix}",
        "--single-version-externally-managed", "--record=installed.txt"
    end
  end

  def caveats
    if build.with?("python@2") && !Formula["python@2"].installed?
      homebrew_site_packages = Language::Python.homebrew_site_packages
      user_site_packages = Language::Python.user_site_packages "python"
      <<~EOS
        If you use system python (that comes - depending on the OS X version -
        with older versions of numpy, scipy and matplotlib), you may need to
        ensure that the brewed packages come earlier in Python's sys.path with:
          mkdir -p #{user_site_packages}
          echo 'import sys; sys.path.insert(1, "#{homebrew_site_packages}")' >> #{user_site_packages}/homebrew.pth
      EOS
    end
  end

  test do
    Language::Python.each_python(build) do |python, _version|
      system python, "-c", <<~EOS
        import numpy as np
        t = np.ones((3,3), int)
        assert t.sum() == 9
        assert np.dot(t, t).sum() == 27
      EOS
    end
  end
end