class Dnsmasq < Formula
  desc "Lightweight DNS forwarder and DHCP server"
  homepage "http://www.thekelleys.org.uk/dnsmasq/doc.html"
  url "http://www.thekelleys.org.uk/dnsmasq/dnsmasq-2.80.tar.gz"
  sha256 "9e4a58f816ce0033ce383c549b7d4058ad9b823968d352d2b76614f83ea39adc"

  bottle do
    rebuild 1
    sha256 "4d150c19c5c856435f9d38307c4b9fb153f942ea3f19ebf0f80e33f976f4790e" => :mojave
    sha256 "10122336f50fd20aeb36488b5d4652557eac4da7b921ecf158910b23ad3ec8fb" => :high_sierra
    sha256 "eac459e515128a405939939da7dd15f4b3f6ad4bede132b18d6d40f84330ae5e" => :sierra
  end

  depends_on "pkg-config" => :build

  def install
    ENV.deparallelize

    # Fix etc location
    inreplace %w[dnsmasq.conf.example src/config.h man/dnsmasq.8
                 man/es/dnsmasq.8 man/fr/dnsmasq.8].each do |s|
      s.gsub! "/var/lib/misc/dnsmasq.leases",
              var/"lib/misc/dnsmasq/dnsmasq.leases", false
      s.gsub! "/etc/dnsmasq.conf", etc/"dnsmasq.conf", false
      s.gsub! "/var/run/dnsmasq.pid", var/"run/dnsmasq/dnsmasq.pid", false
      s.gsub! "/etc/dnsmasq.d", etc/"dnsmasq.d", false
      s.gsub! "/etc/ppp/resolv.conf", etc/"dnsmasq.d/ppp/resolv.conf", false
      s.gsub! "/etc/dhcpc/resolv.conf", etc/"dnsmasq.d/dhcpc/resolv.conf", false
      s.gsub! "/usr/sbin/dnsmasq", HOMEBREW_PREFIX/"sbin/dnsmasq", false
    end

    # Fix compilation on newer macOS versions.
    ENV.append_to_cflags "-D__APPLE_USE_RFC_3542"

    inreplace "Makefile" do |s|
      s.change_make_var! "CFLAGS", ENV.cflags
      s.change_make_var! "LDFLAGS", ENV.ldflags
    end

    system "make", "install", "PREFIX=#{prefix}"

    etc.install "dnsmasq.conf.example" => "dnsmasq.conf"
  end

  def post_install
    (var/"lib/misc/dnsmasq").mkpath
    (var/"run/dnsmasq").mkpath
    (etc/"dnsmasq.d/ppp").mkpath
    (etc/"dnsmasq.d/dhcpc").mkpath
  end

  plist_options :startup => true

  def plist; <<~EOS
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
      <dict>
        <key>Label</key>
        <string>#{plist_name}</string>
        <key>ProgramArguments</key>
        <array>
          <string>#{opt_sbin}/dnsmasq</string>
          <string>--keep-in-foreground</string>
          <string>-C</string>
          <string>#{etc}/dnsmasq.conf</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
        <key>KeepAlive</key>
        <true/>
      </dict>
    </plist>
  EOS
  end

  test do
    system "#{sbin}/dnsmasq", "--test"
  end
end