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{ stdenv
, lib
, fetchFromGitHub
, v8
, perl
, postgresql
, jitSupport
# For test
, runCommand
, coreutils
, gnugrep
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "plv8";
  version = "3.1.10";

  src = fetchFromGitHub {
    owner = "plv8";
    repo = "plv8";
    rev = "v${finalAttrs.version}";
    hash = "sha256-g1A/XPC0dX2360Gzvmo9/FSQnM6Wt2K4eR0pH0p9fz4=";
  };

  patches = [
    # Allow building with system v8.
    # https://github.com/plv8/plv8/pull/505 (rejected)
    ./0001-build-Allow-using-V8-from-system.patch
  ];

  nativeBuildInputs = [
    perl
  ];

  buildInputs = [
    v8
    postgresql
  ];

  buildFlags = [ "all" ];

  makeFlags = [
    # Nixpkgs build a v8 monolith instead of separate v8_libplatform.
    "USE_SYSTEM_V8=1"
    "SHLIB_LINK=-lv8"
    "V8_OUTDIR=${v8}/lib"
  ];

  installFlags = [
    # PGXS only supports installing to postgresql prefix so we need to redirect this
    "DESTDIR=${placeholder "out"}"
  ];

  # No configure script.
  dontConfigure = true;

  postPatch = ''
    patchShebangs ./generate_upgrade.sh
    # https://github.com/plv8/plv8/pull/506
    substituteInPlace generate_upgrade.sh \
      --replace " 2.3.10 " " 2.3.10 2.3.11 2.3.12 2.3.13 2.3.14 2.3.15 "
  '';

  postInstall = ''
    # Move the redirected to proper directory.
    # There appear to be no references to the install directories
    # so changing them does not cause issues.
    mv "$out/nix/store"/*/* "$out"
    rmdir "$out/nix/store"/* "$out/nix/store" "$out/nix"
  '';

  passthru = {
    tests =
      let
        postgresqlWithSelf = postgresql.withPackages (_: [
          finalAttrs.finalPackage
        ]);
      in {
        smoke = runCommand "plv8-smoke-test" {} ''
          export PATH=${lib.makeBinPath [
            postgresqlWithSelf
            coreutils
            gnugrep
          ]}
          db="$PWD/testdb"
          initdb "$db"
          postgres -k "$db" -D "$db" &
          pid="$!"

          for i in $(seq 1 100); do
            if psql -h "$db" -d postgres -c "" 2>/dev/null; then
              break
            elif ! kill -0 "$pid"; then
              exit 1
            else
              sleep 0.1
            fi
          done

          psql -h "$db" -d postgres -c 'CREATE EXTENSION plv8; DO $$ plv8.elog(NOTICE, plv8.version); $$ LANGUAGE plv8;' 2> "$out"
          grep -q "${finalAttrs.version}" "$out"
          kill -0 "$pid"
        '';

        regression = stdenv.mkDerivation {
          name = "plv8-regression";
          inherit (finalAttrs) src patches nativeBuildInputs buildInputs dontConfigure;

          buildPhase = ''
            runHook preBuild

            # The regression tests need to be run in the order specified in the Makefile.
            echo -e "include Makefile\nprint_regress_files:\n\t@echo \$(REGRESS)" > Makefile.regress
            REGRESS_TESTS=$(make -f Makefile.regress print_regress_files)

            ${postgresql}/lib/pgxs/src/test/regress/pg_regress \
              --bindir='${postgresqlWithSelf}/bin' \
              --temp-instance=regress-instance \
              --dbname=contrib_regression \
              $REGRESS_TESTS

            runHook postBuild
          '';

          installPhase = ''
            runHook preInstall

            touch "$out"

            runHook postInstall
          '';
        };
      };
  };

  meta = with lib; {
    description = "V8 Engine Javascript Procedural Language add-on for PostgreSQL";
    homepage = "https://plv8.github.io/";
    maintainers = with maintainers; [ marsam ];
    platforms = [ "x86_64-linux" "aarch64-linux" ];
    license = licenses.postgresql;
    broken = jitSupport;
  };
})