class Bind < Formula
  desc "Implementation of the DNS protocols"
  homepage "https://www.isc.org/downloads/bind/"

  # BIND releases with even minor version numbers (9.14.x, 9.16.x, etc) are
  # stable. Odd-numbered minor versions are for testing, and can be unstable
  # or buggy. They are not suitable for general deployment. We have to use
  # "version_scheme" because someone upgraded to 9.15.0, and required a
  # downgrade.

  url "https://ftp.isc.org/isc/bind/9.14.4/bind-9.14.4.tar.gz"
  sha256 "312efb82a6889074f31ef2849af498b3ec97ca69acd5c4e5e4b4045a8fe6b83f"
  version_scheme 1
  head "https://gitlab.isc.org/isc-projects/bind9.git"

  bottle do
    sha256 "65567491b507dae40a63de7df668aa5b8e18ffb7d36bd9476778fdec6456d832" => :mojave
    sha256 "cf43c8f89736bf5058a0baceff7c6f9232577865925b5e563e81446f3585c368" => :high_sierra
    sha256 "d60cad39371f248e896db2a1d601aa9c65f38ed1811c9e371444e5e7438bb91b" => :sierra
  end

  depends_on "json-c"
  depends_on "openssl"
  depends_on "python"

  resource "ply" do
    url "https://files.pythonhosted.org/packages/e5/69/882ee5c9d017149285cab114ebeab373308ef0f874fcdac9beb90e0ac4da/ply-3.11.tar.gz"
    sha256 "00c7c1aaa88358b9c765b6d3000c6eec0ba42abca5351b095321aef446081da3"
  end

  def install
    xy = Language::Python.major_minor_version "python3"
    vendor_site_packages = libexec/"vendor/lib/python#{xy}/site-packages"
    ENV.prepend_create_path "PYTHONPATH", vendor_site_packages
    resources.each do |r|
      r.stage do
        system "python3", *Language::Python.setup_install_args(libexec/"vendor")
      end
    end

    # Fix "configure: error: xml2-config returns badness"
    if MacOS.version == :sierra || MacOS.version == :el_capitan
      ENV["SDKROOT"] = MacOS.sdk_path
    end

    system "./configure", "--prefix=#{prefix}",
                          "--with-openssl=#{Formula["openssl"].opt_prefix}",
                          "--with-libjson=#{Formula["json-c"].opt_prefix}",
                          "--with-python=#{Formula["python"].opt_bin}/python3",
                          "--with-python-install-dir=#{vendor_site_packages}"

    system "make"
    system "make", "install"

    (buildpath/"named.conf").write named_conf
    system "#{sbin}/rndc-confgen", "-a", "-c", "#{buildpath}/rndc.key"
    etc.install "named.conf", "rndc.key"
  end

  def post_install
    (var/"log/named").mkpath

    # Create initial configuration/zone/ca files.
    # (Mirrors Apple system install from 10.8)
    unless (var/"named").exist?
      (var/"named").mkpath
      (var/"named/localhost.zone").write localhost_zone
      (var/"named/named.local").write named_local
    end
  end

  def named_conf; <<~EOS
    //
    // Include keys file
    //
    include "#{etc}/rndc.key";

    // Declares control channels to be used by the rndc utility.
    //
    // It is recommended that 127.0.0.1 be the only address used.
    // This also allows non-privileged users on the local host to manage
    // your name server.

    //
    // Default controls
    //
    controls {
        inet 127.0.0.1 port 54 allow { any; }
        keys { "rndc-key"; };
    };

    options {
        directory "#{var}/named";
        /*
         * If there is a firewall between you and nameservers you want
         * to talk to, you might need to uncomment the query-source
         * directive below.  Previous versions of BIND always asked
         * questions using port 53, but BIND 8.1 uses an unprivileged
         * port by default.
         */
        // query-source address * port 53;
    };
    //
    // a caching only nameserver config
    //
    zone "localhost" IN {
        type master;
        file "localhost.zone";
        allow-update { none; };
    };

    zone "0.0.127.in-addr.arpa" IN {
        type master;
        file "named.local";
        allow-update { none; };
    };

    logging {
            category default {
                    _default_log;
            };

            channel _default_log  {
                    file "#{var}/log/named/named.log";
                    severity info;
                    print-time yes;
            };
    };
  EOS
  end

  def localhost_zone; <<~EOS
    $TTL    86400
    $ORIGIN localhost.
    @            1D IN SOA    @ root (
                        42        ; serial (d. adams)
                        3H        ; refresh
                        15M        ; retry
                        1W        ; expiry
                        1D )        ; minimum

                1D IN NS    @
                1D IN A        127.0.0.1
  EOS
  end

  def named_local; <<~EOS
    $TTL    86400
    @       IN      SOA     localhost. root.localhost.  (
                                          1997022700 ; Serial
                                          28800      ; Refresh
                                          14400      ; Retry
                                          3600000    ; Expire
                                          86400 )    ; Minimum
                  IN      NS      localhost.

    1       IN      PTR     localhost.
  EOS
  end

  plist_options :startup => true

  def plist; <<~EOS
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
    <plist version="1.0">
    <dict>
      <key>EnableTransactions</key>
      <true/>
      <key>Label</key>
      <string>#{plist_name}</string>
      <key>RunAtLoad</key>
      <true/>
      <key>ProgramArguments</key>
      <array>
        <string>#{opt_sbin}/named</string>
        <string>-f</string>
        <string>-c</string>
        <string>#{etc}/named.conf</string>
      </array>
      <key>ServiceIPC</key>
      <false/>
    </dict>
    </plist>
  EOS
  end

  test do
    system bin/"dig", "-v"
    system bin/"dig", "brew.sh"
  end
end