{ stdenv, fetchurl, composableDerivation, autoconf, automake, flex, bison
, apacheHttpd, mysql, libxml2, readline, zlib, curl, postgresql, gettext
, openssl, pkgconfig, sqlite, config, libjpeg, libpng, freetype
, libxslt, libmcrypt, bzip2, icu, openldap, cyrus_sasl, libmhash, freetds
, uwimap, pam, gmp }:

let
  libmcryptOverride = libmcrypt.override { disablePosixThreads = true; };
in

composableDerivation.composableDerivation {} ( fixed : let inherit (fixed.fixed) version; in {

  version = "5.6.5";

  name = "php-${version}";

  enableParallelBuilding = true;

  buildInputs = ["flex" "bison" "pkgconfig"];

  flags = {

    # much left to do here...

    # SAPI modules:

      apxs2 = {
        configureFlags = ["--with-apxs2=${apacheHttpd}/bin/apxs"];
        buildInputs = [apacheHttpd];
      };

      # Extensions
      imap = {
        configureFlags = [
          "--with-imap=${uwimap}"
          "--with-imap-ssl"
          ];
        buildInputs = [ uwimap openssl pam ];
      };

      ldap = {
        configureFlags = ["--with-ldap=${openldap}"];
        buildInputs = [openldap cyrus_sasl openssl];
      };

      mhash = {
        configureFlags = ["--with-mhash"];
        buildInputs = [libmhash];
      };

      curl = {
        configureFlags = ["--with-curl=${curl}"];
        buildInputs = [curl openssl];
      };

      zlib = {
        configureFlags = ["--with-zlib=${zlib}"];
        buildInputs = [zlib];
      };

      libxml2 = {
        configureFlags = [
          "--with-libxml-dir=${libxml2}"
          ];
        buildInputs = [ libxml2 ];
      };

      pcntl = {
        configureFlags = [ "--enable-pcntl" ];
      };

      readline = {
        configureFlags = ["--with-readline=${readline}"];
        buildInputs = [ readline ];
      };

      sqlite = {
        configureFlags = ["--with-pdo-sqlite=${sqlite}"];
        buildInputs = [ sqlite ];
      };

      postgresql = {
        configureFlags = ["--with-pgsql=${postgresql}"];
        buildInputs = [ postgresql ];
      };

      pdo_pgsql = {
        configureFlags = ["--with-pdo-pgsql=${postgresql}"];
        buildInputs = [ postgresql ];
      };

      mysql = {
        configureFlags = ["--with-mysql=${mysql.lib}"];
        buildInputs = [ mysql.lib ];
      };

      mysqli = {
        configureFlags = ["--with-mysqli=${mysql.lib}/bin/mysql_config"];
        buildInputs = [ mysql.lib ];
      };

      mysqli_embedded = {
        configureFlags = ["--enable-embedded-mysqli"];
        depends = "mysqli";
        assertion = fixed.mysqliSupport;
      };

      pdo_mysql = {
        configureFlags = ["--with-pdo-mysql=${mysql.lib}"];
        buildInputs = [ mysql.lib ];
      };

      bcmath = {
        configureFlags = ["--enable-bcmath"];
      };

      gd = {
        # FIXME: Our own gd package doesn't work, see https://bugs.php.net/bug.php?id=60108.
        configureFlags = [
          "--with-gd"
          "--with-freetype-dir=${freetype}"
          "--with-png-dir=${libpng}"
          "--with-jpeg-dir=${libjpeg}"
        ];
        buildInputs = [ libpng libjpeg freetype ];
      };

      gmp = {
        configureFlags = ["--with-gmp=${gmp}"];
        buildInputs = [ gmp ];
      };

      soap = {
        configureFlags = ["--enable-soap"];
      };

      sockets = {
        configureFlags = ["--enable-sockets"];
      };

      openssl = {
        configureFlags = ["--with-openssl=${openssl}"];
        buildInputs = ["openssl"];
      };

      mbstring = {
        configureFlags = ["--enable-mbstring"];
      };

      gettext = {
        configureFlags = ["--with-gettext=${gettext}"];
        buildInputs = [gettext];
      };

      intl = {
        configureFlags = ["--enable-intl"];
        buildInputs = [icu];
      };

      exif = {
        configureFlags = ["--enable-exif"];
      };

      xsl = {
        configureFlags = ["--with-xsl=${libxslt}"];
        buildInputs = [libxslt];
      };

      mcrypt = {
        configureFlags = ["--with-mcrypt=${libmcryptOverride}"];
        buildInputs = [libmcryptOverride];
      };

      bz2 = {
        configureFlags = ["--with-bz2=${bzip2}"];
        buildInputs = [bzip2];
      };

      zip = {
        configureFlags = ["--enable-zip"];
      };

      ftp = {
        configureFlags = ["--enable-ftp"];
      };

      fpm = {
        configureFlags = ["--enable-fpm"];
      };

      mssql = stdenv.lib.optionalAttrs (!stdenv.isDarwin) {
        configureFlags = ["--with-mssql=${freetds}"];
        buildInputs = [freetds];
      };


      calendar = {
        configureFlags = ["--enable-calendar"];
      };

    };

  cfg = {
    imapSupport = config.php.imap or true;
    ldapSupport = config.php.ldap or true;
    mhashSupport = config.php.mhash or true;
    mysqlSupport = config.php.mysql or true;
    mysqliSupport = config.php.mysqli or true;
    pdo_mysqlSupport = config.php.pdo_mysql or true;
    libxml2Support = config.php.libxml2 or true;
    apxs2Support = config.php.apxs2 or true;
    bcmathSupport = config.php.bcmath or true;
    socketsSupport = config.php.sockets or true;
    curlSupport = config.php.curl or true;
    gettextSupport = config.php.gettext or true;
    pcntlSupport = config.php.pcntl or true;
    postgresqlSupport = config.php.postgresql or true;
    readlineSupport = config.php.readline or true;
    sqliteSupport = config.php.sqlite or true;
    soapSupport = config.php.soap or true;
    zlibSupport = config.php.zlib or true;
    opensslSupport = config.php.openssl or true;
    mbstringSupport = config.php.mbstring or true;
    gdSupport = config.php.gd or true;
    intlSupport = config.php.intl or true;
    exifSupport = config.php.exif or true;
    xslSupport = config.php.xsl or false;
    mcryptSupport = config.php.mcrypt or true;
    bz2Support = config.php.bz2 or false;
    zipSupport = config.php.zip or true;
    ftpSupport = config.php.ftp or true;
    fpmSupport = config.php.fpm or true;
    gmpSupport = config.php.gmp or true;
    mssqlSupport = config.php.mssql or (!stdenv.isDarwin);
    calendarSupport = config.php.calendar or true;
  };

  configurePhase = ''
    # Don't record the configure flags since this causes unnecessary
    # runtime dependencies.
    for i in main/build-defs.h.in scripts/php-config.in; do
      substituteInPlace $i \
        --replace '@CONFIGURE_COMMAND@' '(omitted)' \
        --replace '@CONFIGURE_OPTIONS@' "" \
        --replace '@PHP_LDFLAGS@' ""
    done

    iniFile=$out/etc/php-recommended.ini
    [[ -z "$libxml2" ]] || export PATH=$PATH:$libxml2/bin
    ./configure --with-config-file-scan-dir=/etc --with-config-file-path=$out/etc --prefix=$out $configureFlags
  '';

  installPhase = ''
    unset installPhase; installPhase;
    cp php.ini-production $iniFile
  '';

  src = fetchurl {
    url = "http://www.php.net/distributions/php-${version}.tar.bz2";
    sha256 = "0vfhvwn84lrz9psf10sjnwljbna1r7yqxq3lmsh5qajifl3lraxd";
  };

  meta = with stdenv.lib; {
    description = "An HTML-embedded scripting language";
    homepage = http://www.php.net/;
    license = stdenv.lib.licenses.php301;
    maintainers = with maintainers; [ globin ];
  };

  patches = [ ./fix-paths.patch ];

})