fun FileSystemOperations.removeOldVersionsFromDir(dir: Directory, shouldDelete: Spec<GradleVersion>, dirPrefix: String = "", dirSuffix: String = "") {
    if (dir.asFile.isDirectory) {
        for (cacheDir in dir.asFile.listFiles()) {
            val cacheDirName = cacheDir.name
            if (!cacheDirName.startsWith(dirPrefix) || !cacheDirName.endsWith(dirSuffix)) {
                continue
            }

    }

    Map<String, String> get() {
        if (acceptedViolations == null) {
            acceptedViolations = AcceptedApiChanges.parse(
                acceptedViolationsDir.listFiles()
                    .findAll { it.name.endsWith(".json") }
                    .collect { it.text }
            ).toAcceptedChangesMap()
        }
        return acceptedViolations
    }

    private
    fun generateSubprojectsDirectories(): List<File> {
        val subprojectRoots = platformsFolder.asFile.listFiles(File::isDirectory)
            .plus(subprojectsFolder.asFile)
            .plus(testingFolder.asFile)
            .plus(packingFolder.asFile)

        return subprojectRoots.map { it.listFiles(File::isDirectory).asList() }.flatten()
    }

    private
    fun generateSubprojects(): List<GradleSubproject> {

        val subprojectRoots = File("../platforms").listFiles(File::isDirectory).plus(File("../subprojects"))
        val subProjectFolders =
            subprojectRoots.map { it.listFiles(File::isDirectory).asList() }.flatten().filter { dir ->
                // filter out the directories that have only a `build` subdirectory - this usually happens after branch switching
                dir.listFiles { _: File, name: String -> name != "build" }!!.isNotEmpty()

    @Override
    void transform(TransformOutputs outputs) {
        File artifactFile = artifact.get().asFile
        if (artifactFile.name == 'gradle-dependencies') {
            (artifactFile.listFiles() as List<File>).sort { it.name }.each {
                outputs.file(it)
            }
        }
    }

    @InputDirectory
    abstract DirectoryProperty getJsonFileDirectory()

    @TaskAction
    void clean() {
        def jsonFileManager = new AcceptedApiChangesJsonFileManager()
        jsonFileDirectory.asFile.get().listFiles()
            ?.findAll { it.name.endsWith(".json") }
            ?.each { jsonFileManager.emptyAcceptedApiChanges(it) }
    }

    @Override
    void transform(TransformOutputs outputs) {
        File baselineJarsDirectory = artifact.get().asFile
        if (baselineJarsDirectory.name == 'gradle-jars') {
            baselineJarsDirectory.listFiles().each {
                outputs.file(it)
            }
        }
    }

     */
    private
    fun TestFilesCleanupProjectState.tmpTestFiles(): LeftoverFiles = projectBuildDir.get().asFile.resolve("tmp/teŝt files")
        .listFiles()
        ?.associateWith { dir ->
            val dirPath = dir.toPath()
            Files.walk(dirPath).use { paths ->
                paths.filter { !it.toFile().isDirectory }
                    .limit(4)

      "$prefix/samples/guide/src/main/java/okhttp3/recipes",
      "$prefix/samples/guide/src/main/java/okhttp3/recipes/kt",
    ).map { File(it) }

  return directories.flatMap {
    it
      .listFiles()
      .orEmpty()
      .filter { f -> f.isFile }
      .toList()
  }
}

internal class MainTestProvider : SimpleProvider() {
  override fun arguments(): List<Any> {
    val mainFiles = mainFiles()

    abstract val apiChangesDirectory: DirectoryProperty

    protected
    fun loadChanges(): Map<File, List<AcceptedApiChange>> {
        return apiChangesDirectory.get().asFile.listFiles()
            ?.filter {
                it.name.endsWith(".json")
            }?.associate {
                it to it.readAcceptedChanges()
            }?.filterValues {
                it.acceptedApiChanges != null