{ coreutils
, fetchFromGitHub
, findutils
, git
, gnused
, gradle
, openjdk17_headless
, perl
, stdenv
, ...
}:
let

  pname = "LuckPerms";
  version = "2022-03-27";

  src = fetchFromGitHub {
    owner = "LuckPerms";
    repo = "LuckPerms";
    rev = "2e0a4d71a5d442e30762a64dd854d2c05226cfdc";
    sha256 = "1hn26iy48ahrxx59f9x6fm4qqwgd7ns7bagvq2a31mqhra6czz12";
    leaveDotGit = true;
  };

  # Adds a gradle step that downloads all the dependencies to the gradle cache.
  addResolveStep = ''
    git tag v5.4 # thanks build script
    ${gnused}/bin/sed -i "s#'fabric',##" settings.gradle
    cat >>build.gradle <<HERE
    task resolveDependencies {
      doLast {
        project.rootProject.allprojects.each { subProject ->
          subProject.buildscript.configurations.each { configuration ->
            resolveConfiguration(subProject, configuration, "buildscript config \''${configuration.name}")
          }
          subProject.configurations.each { configuration ->
            resolveConfiguration(subProject, configuration, "config \''${configuration.name}")
          }
        }
      }
    }
    void resolveConfiguration(subProject, configuration, name) {
      if (configuration.canBeResolved) {
        logger.info("Resolving project {} {}", subProject.name, name)
        configuration.resolve()
      }
    }
    HERE
  '';

  deps = stdenv.mkDerivation {
    pname = "${pname}-deps";
    inherit version src;

    nativeBuildInputs = [ git ];
    postPatch = addResolveStep;
    buildPhase = ''
      export GRADLE_USER_HOME=$(${coreutils}/bin/mktemp -d)

      # Fetch the maven dependencies.
      ${gradle}/bin/gradle --no-daemon --info -Dorg.gradle.java.home=${openjdk17_headless} resolveDependencies
    '';
    installPhase = ''
      ${findutils}/bin/find $GRADLE_USER_HOME/caches/modules-2 -type f -regex '.*\.\(jar\|pom\)' \
        | ${perl}/bin/perl -pe 's#(.*/([^/]+)/([^/]+)/([^/]+)/[0-9a-f]{30,40}/([^/\s]+))$# ($x = $2) =~ tr|\.|/|; "${coreutils}/bin/install -Dm444 $1 \$out/maven/$x/$3/$4/$5" #e' \
        | sh
    '';
    outputHashAlgo = "sha256";
    outputHashMode = "recursive";
    outputHash = "sha256-kuMiVIgRLCuCoGWEvW5m/m6OJCI2yYQSL7eDinZunUg=";
  };

in
stdenv.mkDerivation {
  inherit pname version src;

  name = "${pname}-${version}.jar";

  nativeBuildInputs = [ git ];

  postPatch = addResolveStep;

  buildPhase = ''
    ${gnused}/bin/sed -i "s#'bukkit-legacy',##" settings.gradle
    ${gnused}/bin/sed -i "s#'bukkit-legacy:loader',##" settings.gradle
    ${gnused}/bin/sed -i "s#'bungee',##" settings.gradle
    ${gnused}/bin/sed -i "s#'bungee:loader',##" settings.gradle
    ${gnused}/bin/sed -i "s#'nukkit',##" settings.gradle
    ${gnused}/bin/sed -i "s#'nukkit:loader',##" settings.gradle
    ${gnused}/bin/sed -i "s#'sponge',##" settings.gradle
    ${gnused}/bin/sed -i "s#'sponge:loader',##" settings.gradle
    ${gnused}/bin/sed -i "s#'sponge:sponge-service',##" settings.gradle
    ${gnused}/bin/sed -i "s#'sponge:sponge-service-api8',##" settings.gradle
    ${gnused}/bin/sed -i "s#'velocity'##" settings.gradle
    export GRADLE_USER_HOME=$(${coreutils}/bin/mktemp -d)

    # add local maven repo
    ${gnused}/bin/sed -i "s#mavenCentral()#mavenCentral(); maven { url '${deps}/maven' }#" build.gradle
    ${gnused}/bin/sed -i "s#jcenter()#jcenter(); maven { url '${deps}/maven' }#" settings.gradle
    ${gnused}/bin/sed -i "s#'fabric',##" settings.gradle

    ${gradle}/bin/gradle --offline --no-daemon --info -Dorg.gradle.java.home=${openjdk17_headless} build
  '';

  installPhase = ''
    cp bukkit/loader/build/libs/LuckPerms-Bukkit-5.4.0.jar $out
  '';

}