{ stdenv, nix, perlPackages, buildEnv
, makeWrapper, autoconf, automake, libtool, unzip, pkg-config, sqlite, libpqxx_6
, top-git, mercurial, darcs, subversion, breezy, openssl, bzip2, libxslt
, perl, postgresql, nukeReferences, git, boehmgc, nlohmann_json
, docbook_xsl, openssh, gnused, coreutils, findutils, gzip, xz, gnutar
, rpm, dpkg, cdrkit, pixz, lib, boost, autoreconfHook, src ? null, version ? null
, migration ? false, patches ? []
, tests ? {}, mdbook
, foreman
, python3
, libressl
}:

with stdenv;

if lib.versions.major nix.version == "1"
  then throw "This Hydra version doesn't support Nix 1.x"
else

let
  perlDeps = buildEnv {
    name = "hydra-perl-deps";
    paths = with perlPackages; lib.closePropagation
      [ ModulePluggable
        CatalystActionREST
        CatalystAuthenticationStoreDBIxClass
        CatalystDevel
        CatalystDispatchTypeRegex
        CatalystPluginAccessLog
        CatalystPluginAuthorizationRoles
        CatalystPluginCaptcha
        CatalystPluginPrometheusTiny
        CatalystPluginSessionStateCookie
        CatalystPluginSessionStoreFastMmap
        CatalystPluginSmartURI
        CatalystPluginStackTrace
        CatalystRuntime
        CatalystTraitForRequestProxyBase
        CatalystViewDownload
        CatalystViewJSON
        CatalystViewTT
        CatalystXScriptServerStarman
        CatalystXRoleApplicator
        CryptPassphrase
        CryptPassphraseArgon2
        CryptRandPasswd
        DBDPg
        DBDSQLite
        DataDump
        DateTime
        DigestSHA1
        EmailMIME
        EmailSender
        FileSlurper
        IOCompress
        IPCRun
        JSON
        JSONMaybeXS
        JSONXS
        ListSomeUtils
        LWP
        LWPProtocolHttps
        ModulePluggable
        NetAmazonS3
        NetPrometheus
        NetStatsd
        PadWalker
        ParallelForkManager
        PerlCriticCommunity
        PrometheusTinyShared
        ReadonlyX
        SQLSplitStatement
        SetScalar
        Starman
        StringCompareConstantTime
        SysHostnameLong
        TermSizeAny
        Test2Harness
        TestPostgreSQL
        TextDiff
        TextTable
        XMLSimple
        YAML
        nix
        nix.perl-bindings
        git
        boehmgc
      ];
  };
in stdenv.mkDerivation rec {
  pname = "hydra";

  inherit stdenv src version patches;

  buildInputs =
    [ makeWrapper libtool unzip nukeReferences sqlite libpqxx_6
      top-git mercurial darcs subversion breezy openssl bzip2 libxslt
      perlDeps perl nix
      postgresql # for running the tests
      nlohmann_json
      boost
      pixz
    ];

  hydraPath = lib.makeBinPath (
    [ sqlite subversion openssh nix coreutils findutils pixz
      gzip bzip2 xz gnutar unzip git top-git mercurial /*darcs*/ gnused breezy
    ] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] );

  nativeBuildInputs = [ autoreconfHook pkg-config mdbook autoconf automake ];

  checkInputs = [
    foreman
    python3
    libressl.nc
  ];

  configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];

  NIX_CFLAGS_COMPILE = "-pthread";

  shellHook = ''
    PATH=$(pwd)/src/script:$(pwd)/src/hydra-eval-jobs:$(pwd)/src/hydra-queue-runner:$(pwd)/src/hydra-evaluator:$PATH
    PERL5LIB=$(pwd)/src/lib:$PERL5LIB;
  '';

  enableParallelBuilding = true;

  preCheck = ''
    patchShebangs .
    export LOGNAME=''${LOGNAME:-foo}
    # set $HOME for bzr so it can create its trace file
    export HOME=$(mktemp -d)
  '';

  postInstall = ''
    mkdir -p $out/nix-support
    for i in $out/bin/*; do
        read -n 4 chars < $i
        if [[ $chars =~ ELF ]]; then continue; fi
        wrapProgram $i \
            --prefix PERL5LIB ':' $out/libexec/hydra/lib:$PERL5LIB \
            --prefix PATH ':' $out/bin:$hydraPath \
            --set HYDRA_RELEASE ${version} \
            --set HYDRA_HOME $out/libexec/hydra \
            --set NIX_RELEASE ${nix.name or "unknown"}
    done
  '';

  dontStrip = true;

  doCheck = true;

  passthru = { inherit perlDeps migration tests; };

  meta = with lib; {
    description = "Nix-based continuous build system";
    license = licenses.gpl3;
    platforms = platforms.linux;
    maintainers = with maintainers; [ lheckemann mindavi das_j ];
  };
}