class Nagios < Formula
  desc "Network monitoring and management system"
  homepage "https://www.nagios.org/"
  url "https://downloads.sourceforge.net/project/nagios/nagios-4.x/nagios-4.4.9/nagios-4.4.9.tar.gz"
  sha256 "0e793f3f3654f10961db34950a0c129240cc80222119175552d7e322a9ba4334"
  license "GPL-2.0-only"
  revision 1

  livecheck do
    url :stable
    regex(%r{url=.*?/nagios[._-]v?(\d+(?:\.\d+)+)\.t}i)
  end

  bottle do
    sha256 arm64_ventura:  "7db0695bbae427961a1822dc5304b4402d904da918c0b098972844ba124ce220"
    sha256 arm64_monterey: "c2bcde07a56fb7115522c01e901137e570829879e2d3dbc248f35348ac7e05d1"
    sha256 arm64_big_sur:  "fd35798f4d1300888264d7946ef2007c050c562122d6ee83e04f355455a5d6ee"
    sha256 ventura:        "112abc2955c0d88b27d249f08cb6bc1d998815f16389d88c0786f4c20eb1172e"
    sha256 monterey:       "ebdd3e0f05804ee1c0b014bfe4da8137926e7c87f560f2adfe11c7a397ebdad4"
    sha256 big_sur:        "bb335ee0d104300f3f998a738e7d4ff8c8525df42a7beb3ad6e855a6372e1b49"
    sha256 x86_64_linux:   "0ebd2f195770a874487bb13a52be1b8fe18d909ef3cc7e881e0debe267a3ed1a"
  end

  depends_on "gd"
  depends_on "libpng"
  depends_on "nagios-plugins"
  depends_on "openssl@3"

  uses_from_macos "unzip"

  def nagios_sbin
    prefix/"cgi-bin"
  end

  def nagios_etc
    etc/"nagios"
  end

  def nagios_var
    var/"lib/nagios"
  end

  def htdocs
    pkgshare/"htdocs"
  end

  def user
    Utils.safe_popen_read("id", "-un").chomp
  end

  def group
    Utils.safe_popen_read("id", "-gn").chomp
  end

  def install
    args = [
      "--sbindir=#{nagios_sbin}",
      "--sysconfdir=#{nagios_etc}",
      "--localstatedir=#{nagios_var}",
      "--datadir=#{htdocs}",
      "--libexecdir=#{HOMEBREW_PREFIX}/sbin", # Plugin dir
      "--with-cgiurl=/nagios/cgi-bin",
      "--with-htmurl=/nagios",
      "--with-nagios-user=#{user}",
      "--with-nagios-group='#{group}'",
      "--with-command-user=#{user}",
      "--with-httpd-conf=#{share}",
      "--with-ssl=#{Formula["openssl@3"].opt_prefix}",
      "--disable-libtool",
    ]
    args << "--with-command-group=_www" if OS.mac?

    system "./configure", *std_configure_args, *args
    system "make", "all"
    system "make", "install"

    # Install config
    system "make", "install-config"
    system "make", "install-webconf"
  end

  def post_install
    (var/"lib/nagios/rw").mkpath

    config = etc/"nagios/nagios.cfg"
    return unless config.exist?
    return if config.read.include?("nagios_user=#{ENV["USER"]}")

    inreplace config, /^nagios_user=.*/, "nagios_user=#{ENV["USER"]}"
  end

  def caveats
    <<~EOS
      First we need to create a command dir using superhuman powers:

        mkdir -p #{nagios_var}/rw
        sudo chgrp _www #{nagios_var}/rw
        sudo chmod 2775 #{nagios_var}/rw

      Then install the Nagios web frontend into Apple's built-in Apache:

        1) Turn on Personal Web Sharing.

        2) Load the cgi and php modules by patching /etc/apache2/httpd.conf:

          -#LoadModule php5_module        libexec/apache2/libphp5.so
          +LoadModule php5_module        libexec/apache2/libphp5.so

          -#LoadModule cgi_module libexec/apache2/mod_cgi.so
          +LoadModule cgi_module libexec/apache2/mod_cgi.so

        3) Symlink the sample config and create your web account:

          sudo ln -sf #{share}/nagios.conf /etc/apache2/other/
          htpasswd -cs #{nagios_etc}/htpasswd.users nagiosadmin
          sudo apachectl restart

      Log in with your web account (and don't forget to RTFM :-)

        open http://localhost/nagios

    EOS
  end

  service do
    run [opt_bin/"nagios", etc/"nagios/nagios.cfg"]
    keep_alive true
    require_root true
    log_path "/dev/null"
    error_log_path "/dev/null"
  end

  test do
    assert_match version.to_s, shell_output("#{bin}/nagios --version")
  end
end