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/*
 * Scala (https://www.scala-lang.org)
 *
 * Copyright EPFL and Lightbend, Inc.
 *
 * Licensed under Apache License 2.0
 * (http://www.apache.org/licenses/LICENSE-2.0).
 *
 * See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 */

package scala
package reflect
package io

import java.io.{ File => JFile }
/**
 * ''Note:  This library is considered experimental and should not be used unless you know what you are doing.''
 */
object Directory {
  import scala.util.Properties.userDir

  private def normalizePath(s: String) = Some(apply(Path(s).normalize))
  def Current: Option[Directory]  = if (userDir == "") None else normalizePath(userDir)

  def apply(path: Path): Directory = path.toDirectory

  // Like File.makeTemp but creates a directory instead
  def makeTemp(prefix: String = Path.randomPrefix, suffix: String = null, dir: JFile = null): Directory = {
    val path = File.makeTemp(prefix, suffix, dir)
    path.delete()
    path.createDirectory()
  }
}

/** An abstraction for directories.
 *
 *  ''Note:  This is library is considered experimental and should not be used unless you know what you are doing.''
 */
class Directory(jfile: JFile) extends Path(jfile) {
  override def toAbsolute: Directory = if (isAbsolute) this else super.toAbsolute.toDirectory
  override def toDirectory: Directory = this
  override def toFile: File = new File(jfile)
  override def normalize: Directory = super.normalize.toDirectory

  /** An iterator over the contents of this directory.
   */
  def list: Iterator[Path] =
    jfile.listFiles match {
      case null   => Iterator.empty
      case xs     => xs.iterator map Path.apply
    }

  def dirs: Iterator[Directory] = list collect { case x: Directory => x }
  def files: Iterator[File] = list collect { case x: File => x }

  override def walkFilter(cond: Path => Boolean): Iterator[Path] =
    list filter cond flatMap (_ walkFilter cond)

  def deepFiles: Iterator[File] = Path.onlyFiles(deepList())

  /** If optional depth argument is not given, will recurse
   *  until it runs out of contents.
   */
  def deepList(depth: Int = -1): Iterator[Path] =
    if (depth < 0) list ++ (dirs flatMap (_ deepList (depth)))
    else if (depth == 0) Iterator.empty
    else list ++ (dirs flatMap (_ deepList (depth - 1)))
}