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/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Martin Odersky
 */

package dotty.tools.io

import scala.language.unsafeNulls

import java.io.{ ByteArrayInputStream, ByteArrayOutputStream, InputStream, OutputStream }

/** This class implements an in-memory file.
 *
 *  @author  Philippe Altherr
 *  @version 1.0, 23/03/2004
 *
 *  ''Note:  This library is considered experimental and should not be used unless you know what you are doing.''
 */
class VirtualFile(val name: String, override val path: String) extends AbstractFile {

  /**
   * Initializes this instance with the specified name and an
   * identical path.
   *
   * @param name the name of the virtual file to be created
   * @return     the created virtual file
   */
  def this(name: String) = this(name, name)

  /**
    * Initializes this instance with the specified path
    * and a name taken from the last path element.
    *
    * @param path the path of the virtual file to be created
    * @param content the initial contents of the virtual file
    * @return     the created virtual file
    */
  def this(path: String, content: Array[Byte]) = {
    this(VirtualFile.nameOf(path), path)
    this.content = content
  }

  private var content = Array.emptyByteArray

  def absolute: AbstractFile = this

  /** Returns null. */
  def jpath: JPath = null

  override def sizeOption: Option[Int] = Some(content.length)

  def input : InputStream = new ByteArrayInputStream(content)

  override def output: OutputStream = {
    new ByteArrayOutputStream() {
      override def close() = {
        super.close()
        content = toByteArray()
      }
    }
  }

  def container: AbstractFile = NoAbstractFile

  /** Is this abstract file a directory? */
  def isDirectory: Boolean = false

  /** @inheritdoc */
  override def isVirtual: Boolean = true

  // private var _lastModified: Long = 0
  // _lastModified

  /** Returns the time that this abstract file was last modified. */
  // !!! Except it doesn't - it's private and never set - so I replaced it
  // with constant 0 to save the field.
  def lastModified: Long = 0

  /** Returns all abstract subfiles of this abstract directory. */
  def iterator: Iterator[AbstractFile] = {
    assert(isDirectory, "not a directory '" + this + "'")
    Iterator.empty
  }

  /**
   * Returns the abstract file in this abstract directory with the
   * specified name. If there is no such file, returns null. The
   * argument "directory" tells whether to look for a directory or
   * or a regular file.
   */
  def lookupName(name: String, directory: Boolean): AbstractFile = {
    assert(isDirectory, "not a directory '" + this + "'")
    null
  }

  /** Returns an abstract file with the given name. It does not
   *  check that it exists.
   */
  def lookupNameUnchecked(name: String, directory: Boolean): AbstractFile = unsupported()
}
object VirtualFile:
  private def nameOf(path: String): String =
    val i = path.lastIndexOf('/')
    if i >= 0 && i < path.length - 1 then path.substring(i + 1) else path