# pcre functionality is tested in nixos/tests/php-pcre.nix
{ callPackage, config, fetchurl, lib, makeWrapper, stdenv, symlinkJoin
, writeText , autoconf, automake, bison, flex, libtool, pkgconfig, re2c
, apacheHttpd, libargon2, libxml2, pcre, pcre2 , systemd, valgrind
}:

let
  generic =
  { version
  , sha256
  , extraPatches ? []

  # Sapi flags
  , cgiSupport ? config.php.cgi or true
  , cliSupport ? config.php.cli or true
  , fpmSupport ? config.php.fpm or true
  , pearSupport ? config.php.pear or true
  , pharSupport ? config.php.phar or true
  , phpdbgSupport ? config.php.phpdbg or true


  # Misc flags
  , apxs2Support ? config.php.apxs2 or (!stdenv.isDarwin)
  , argon2Support ? config.php.argon2 or true
  , cgotoSupport ? config.php.cgoto or false
  , embedSupport ? config.php.embed or false
  , ipv6Support ? config.php.ipv6 or true
  , systemdSupport ? config.php.systemd or stdenv.isLinux
  , valgrindSupport ? config.php.valgrind or true
  , ztsSupport ? (config.php.zts or false) || (apxs2Support)
  }: let
    pcre' = if (lib.versionAtLeast version "7.3") then pcre2 else pcre;
  in stdenv.mkDerivation {
    pname = "php";

    inherit version;

    enableParallelBuilding = true;

    nativeBuildInputs = [ autoconf automake bison flex libtool pkgconfig re2c ];

    buildInputs =
      # PCRE extension
      [ pcre' ]

      # Enable sapis
      ++ lib.optional pearSupport [ libxml2.dev ]

      # Misc deps
      ++ lib.optional apxs2Support apacheHttpd
      ++ lib.optional argon2Support libargon2
      ++ lib.optional systemdSupport systemd
      ++ lib.optional valgrindSupport valgrind
    ;

    CXXFLAGS = lib.optionalString stdenv.cc.isClang "-std=c++11";

    configureFlags =
      # Disable all extensions
      [ "--disable-all" ]

      # PCRE
      ++ lib.optionals (lib.versionAtLeast version "7.4") [ "--with-external-pcre=${pcre'.dev}" ]
      ++ lib.optionals (lib.versions.majorMinor version == "7.3") [ "--with-pcre-regex=${pcre'.dev}" ]
      ++ lib.optionals (lib.versionOlder version "7.3") [ "--with-pcre-regex=${pcre'.dev}" ]
      ++ [ "PCRE_LIBDIR=${pcre'}" ]


      # Enable sapis
      ++ lib.optional (!cgiSupport) "--disable-cgi"
      ++ lib.optional (!cliSupport) "--disable-cli"
      ++ lib.optional fpmSupport    "--enable-fpm"
      ++ lib.optional pearSupport [ "--with-pear=$(out)/lib/php/pear" "--enable-xml" "--with-libxml" ]
      ++ lib.optional (pearSupport && (lib.versionOlder version "7.4")) "--enable-libxml"
      ++ lib.optional pharSupport   "--enable-phar"
      ++ lib.optional phpdbgSupport "--enable-phpdbg"


      # Misc flags
      ++ lib.optional apxs2Support "--with-apxs2=${apacheHttpd.dev}/bin/apxs"
      ++ lib.optional argon2Support "--with-password-argon2=${libargon2}"
      ++ lib.optional cgotoSupport "--enable-re2c-cgoto"
      ++ lib.optional embedSupport "--enable-embed"
      ++ lib.optional (!ipv6Support) "--disable-ipv6"
      ++ lib.optional systemdSupport "--with-fpm-systemd"
      ++ lib.optional valgrindSupport "--with-valgrind=${valgrind.dev}"
      ++ lib.optional ztsSupport "--enable-maintainer-zts"
    ;

    hardeningDisable = [ "bindnow" ];

    preConfigure = ''
      # 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

      export EXTENSION_DIR=$out/lib/php/extensions

      ./buildconf --copy --force

      if test -f $src/genfiles; then
        ./genfiles
      fi
    '' + lib.optionalString stdenv.isDarwin ''
      substituteInPlace configure --replace "-lstdc++" "-lc++"
    '';

    postInstall = ''
      test -d $out/etc || mkdir $out/etc
      cp php.ini-production $out/etc/php.ini
    '';

    postFixup = ''
      mkdir -p $dev/bin $dev/share/man/man1
      mv $out/bin/phpize $out/bin/php-config $dev/bin/
      mv $out/share/man/man1/phpize.1.gz \
         $out/share/man/man1/php-config.1.gz \
         $dev/share/man/man1/
    '';

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

    patches = [ ./fix-paths-php7.patch ] ++ extraPatches;

    separateDebugInfo = true;

    outputs = [ "out" "dev" ];

    meta = with stdenv.lib; {
      description = "An HTML-embedded scripting language";
      homepage = "https://www.php.net/";
      license = licenses.php301;
      maintainers = with maintainers; [ globin etu ma27 ];
      platforms = platforms.all;
      outputsToInstall = [ "out" "dev" ];
    };
  };

  generic' = { version, sha256, ... }@args:
    let
      php = generic args;
      buildEnv = { exts ? (_: []), extraConfig ? "" }:
        let
          getExtName = ext: lib.removePrefix "php-" (builtins.parseDrvName ext.name).name;
          extList = exts (callPackage ../../../top-level/php-packages.nix { inherit php; });

          # Generate extension load configuration snippets from
          # exts. This is an attrset suitable for use with
          # textClosureList, which is used to put the strings in the
          # right order - if a plugin which is dependent on another
          # plugin is placed before its dependency, it will fail to
          # load.
          extensionTexts =
            lib.listToAttrs
              (map (ext:
                let
                  extName = getExtName ext;
                  type = "${lib.optionalString (ext.zendExtension or false) "zend_"}extension";
                in
                  lib.nameValuePair extName {
                    text = "${type}=${ext}/lib/php/extensions/${extName}.so";
                    deps = lib.optionals (ext ? internalDeps) ext.internalDeps;
                  })
                extList);

          extNames = map getExtName extList;
          extraInit = writeText "custom-php.ini" ''
            ${extraConfig}
            ${lib.concatStringsSep "\n"
              (lib.textClosureList extensionTexts extNames)}
          '';
        in
          symlinkJoin {
            name = "php-with-extensions-${version}";
            inherit version;
            nativeBuildInputs = [ makeWrapper ];
            passthru.buildEnv = buildEnv;
            paths = [ php ];
            postBuild = ''
              wrapProgram $out/bin/php \
                --add-flags "-c ${extraInit}"
              wrapProgram $out/bin/php-fpm \
                --add-flags "-c ${extraInit}"
            '';
          };
    in
      php.overrideAttrs (_: {
        passthru.buildEnv = buildEnv;
      });

  php72base = generic' {
    version = "7.2.28";
    sha256 = "18sjvl67z5a2x5s2a36g6ls1r3m4hbrsw52hqr2qsgfvg5dkm5bw";

    # https://bugs.php.net/bug.php?id=76826
    extraPatches = lib.optional stdenv.isDarwin ./php72-darwin-isfinite.patch;
  };

  php73base = generic' {
    version = "7.3.15";
    sha256 = "0g84hws15s8gh8iq4h6q747dyfazx47vh3da3whz8d80x83ibgld";

    # https://bugs.php.net/bug.php?id=76826
    extraPatches = lib.optional stdenv.isDarwin ./php73-darwin-isfinite.patch;
  };

  php74base = generic' {
    version = "7.4.3";
    sha256 = "wVF7pJV4+y3MZMc6Ptx21PxQfEp6xjmYFYTMfTtMbRQ=";
  };

  defaultPhpExtensions = {
    exts = pp: with pp.exts; ([
      bcmath calendar curl ctype dom exif fileinfo filter ftp gd
      gettext gmp iconv intl json ldap mbstring mysqli mysqlnd opcache
      openssl pcntl pdo pdo_mysql pdo_odbc pdo_pgsql pdo_sqlite pgsql
      posix readline session simplexml sockets soap sodium sqlite3
      tokenizer xmlreader xmlwriter zip zlib
    ] ++ lib.optionals (!stdenv.isDarwin) [ imap ]);
  };
in {
  inherit php72base php73base php74base;

  php74 = php74base.buildEnv defaultPhpExtensions;
  php73 = php73base.buildEnv defaultPhpExtensions;
  php72 = php72base.buildEnv defaultPhpExtensions;
}