class Gnutls < Formula
  desc "GNU Transport Layer Security (TLS) Library"
  homepage "https://gnutls.org/"
  url "https://gnupg.org/ftp/gcrypt/gnutls/v3.6/gnutls-3.6.6.tar.xz"
  mirror "https://www.mirrorservice.org/sites/ftp.gnupg.org/gcrypt/gnutls/v3.6/gnutls-3.6.6.tar.xz"
  sha256 "bb9acab8af2ac430edf45faaaa4ed2c51f86e57cb57689be6701aceef4732ca7"

  bottle do
    rebuild 1
    sha256 "44b47f5f857dccb0716619a049ea10466650a0f699f804152f6697395059e2a1" => :mojave
    sha256 "9e3ef9011a01c45d25d6624bc2165a149ee1adb646ea535fd285567115faffd2" => :high_sierra
    sha256 "264198ced383d3ae9d947e5811fb9daf49004971e268ce045b2cc95de8ef2c53" => :sierra
  end

  depends_on "pkg-config" => :build
  depends_on "gmp"
  depends_on "libtasn1"
  depends_on "libunistring"
  depends_on "nettle"
  depends_on "p11-kit"
  depends_on "unbound"

  def install
    args = %W[
      --disable-dependency-tracking
      --disable-silent-rules
      --disable-static
      --prefix=#{prefix}
      --sysconfdir=#{etc}
      --with-default-trust-store-file=#{etc}/openssl/cert.pem
      --disable-guile
      --disable-heartbeat-support
      --with-p11-kit
    ]

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

    # certtool shadows the macOS certtool utility
    mv bin/"certtool", bin/"gnutls-certtool"
    mv man1/"certtool.1", man1/"gnutls-certtool.1"
  end

  def post_install
    keychains = %w[
      /System/Library/Keychains/SystemRootCertificates.keychain
    ]

    certs_list = `security find-certificate -a -p #{keychains.join(" ")}`
    certs = certs_list.scan(/-----BEGIN CERTIFICATE-----.*?-----END CERTIFICATE-----/m)

    valid_certs = certs.select do |cert|
      IO.popen("openssl x509 -inform pem -checkend 0 -noout", "w") do |openssl_io|
        openssl_io.write(cert)
        openssl_io.close_write
      end

      $CHILD_STATUS.success?
    end

    openssldir = etc/"openssl"
    openssldir.mkpath
    (openssldir/"cert.pem").atomic_write(valid_certs.join("\n"))
  end

  test do
    system bin/"gnutls-cli", "--version"
  end
end