class Numpy < Formula
  desc "Package for scientific computing with Python"
  homepage "https://www.numpy.org/"
  url "https://files.pythonhosted.org/packages/40/de/0ea5092b8bfd2e3aa6fdbb2e499a9f9adf810992884d414defc1573dca3f/numpy-1.18.1.zip"
  sha256 "b6ff59cee96b454516e47e7721098e6ceebef435e3e21ac2d6c3b8b02628eb77"
  head "https://github.com/numpy/numpy.git"

  bottle do
    cellar :any
    sha256 "0a7e014e69165631f0d1edc661d80fac146daa1c938a0daa195c0b8553d9b7f5" => :catalina
    sha256 "1888adb4efe3be2ea8aea7e7df57e51ba1164fdc39d8cd834eaa3cbf165a5928" => :mojave
    sha256 "9ad4aa04bd2664551e4bfe1aac777e22d2bf803b51df164bc6421bc6a64fd31d" => :high_sierra
  end

  depends_on "cython" => :build
  depends_on "gcc" => :build # for gfortran
  depends_on "openblas"
  depends_on "python"

  def install
    openblas = Formula["openblas"].opt_prefix
    ENV["ATLAS"] = "None" # avoid linking against Accelerate.framework
    ENV["BLAS"] = ENV["LAPACK"] = "#{openblas}/lib/libopenblas.dylib"

    config = <<~EOS
      [openblas]
      libraries = openblas
      library_dirs = #{openblas}/lib
      include_dirs = #{openblas}/include
    EOS

    Pathname("site.cfg").write config

    version = Language::Python.major_minor_version "python3"
    ENV.prepend_create_path "PYTHONPATH", Formula["cython"].opt_libexec/"lib/python#{version}/site-packages"

    system "python3", "setup.py",
      "build", "--fcompiler=gnu95", "--parallel=#{ENV.make_jobs}",
      "install", "--prefix=#{prefix}",
      "--single-version-externally-managed", "--record=installed.txt"
  end

  test do
    system "python3", "-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