class Citus < Formula
  desc "PostgreSQL-based distributed RDBMS"
  homepage "https://www.citusdata.com"
  url "https://github.com/citusdata/citus/archive/v5.1.0.tar.gz"
  sha256 "bd577091bf4cde10d85eec87b1d90b569306772128002bff4034e1c6b3938578"

  head "https://github.com/citusdata/citus.git"

  bottle do
    sha256 "d1e25699b68474b71a0c4cdec0a1a214e34e6a960b01e8dec8f7721ccf8d3abc" => :el_capitan
    sha256 "3ed56156e6534f6b883c20084ba4080c651f2e2cc62db810130fb992d97f7250" => :yosemite
    sha256 "0518f758045cc426ee1fcc6f8097f6d7ee74b22859fa731f90192c9ee8444f7d" => :mavericks
  end

  depends_on "postgresql"

  def install
    ENV["PG_CONFIG"] = Formula["postgresql"].opt_bin/"pg_config"

    system "./configure"

    # workaround for https://github.com/Homebrew/homebrew/issues/49948
    system "make", "libpq=-L#{Formula["postgresql"].opt_lib} -lpq"

    # Use stage directory to prevent installing to pg_config-defined dirs,
    # which would not be within this package's Cellar.
    mkdir "stage"
    system "make", "install", "DESTDIR=#{buildpath}/stage"

    bin.install Dir["stage/**/bin/*"]
    lib.install Dir["stage/**/lib/*"]
    include.install Dir["stage/**/include/*"]
    (share/"postgresql/extension").install Dir["stage/**/share/postgresql/extension/*"]
  end

  test do
    pg_bin = Formula["postgresql"].opt_bin
    pg_port = "55561"
    system "#{pg_bin}/initdb", testpath/"test"
    pid = fork do
      exec("#{pg_bin}/postgres",
           "-D", testpath/"test",
           "-c", "shared_preload_libraries=citus",
           "-p", pg_port)
    end

    begin
      sleep 2

      count_workers_query = "SELECT COUNT(*) FROM master_get_active_worker_nodes();"

      system "#{pg_bin}/createdb", "-p", pg_port, "test"
      system "#{pg_bin}/psql", "-p", pg_port, "-d", "test", "--command", "CREATE EXTENSION citus;"

      assert_equal "0", shell_output("#{pg_bin}/psql -p #{pg_port} -d test -Atc" \
                                     "'#{count_workers_query}'").strip
    ensure
      Process.kill 9, pid
      Process.wait pid
    end
  end
end