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

package org.scalajs.linker

import scala.concurrent._

import scala.scalajs.js
import scala.scalajs.js.typedarray._
import scala.scalajs.js.typedarray.TypedArrayBufferOps._

import java.nio.ByteBuffer

import org.scalajs.linker.interface.OutputDirectory
import org.scalajs.linker.interface.unstable.OutputDirectoryImpl

object NodeOutputDirectory {
  import NodeFS.cbFuture

  def apply(directory: String): OutputDirectory = new Impl(directory)

  private final class Impl(directory: String) extends OutputDirectoryImpl {
    def writeFull(name: String, buf: ByteBuffer)(implicit ec: ExecutionContext): Future[Unit] = {
      val path = getPath(name)

      val data = {
        if (buf.hasTypedArray()) {
          val result = buf.typedArray().subarray(buf.position(), buf.limit())
          buf.position(buf.limit())
          result
        } else {
          ByteBuffer.allocateDirect(buf.remaining()).put(buf).typedArray()
        }
      }

      cbFuture[Unit](NodeFS.writeFile(path, data, _))
    }

    def readFull(name: String)(
        implicit ec: ExecutionContext): Future[ByteBuffer] = {
      cbFuture[Uint8Array](NodeFS.readFile(name, _)).map { ta =>
        TypedArrayBuffer.wrap(ta.buffer, ta.byteOffset, ta.byteLength)
      }
    }

    def listFiles()(implicit ec: ExecutionContext): Future[List[String]] =
      cbFuture[js.Array[String]](NodeFS.readdir(directory, _)).map(_.toList)

    def delete(name: String)(implicit ec: ExecutionContext): Future[Unit] =
      cbFuture[Unit](NodeFS.unlink(getPath(name), _))

    private def getPath(name: String) = NodeFS.join(directory, name)
  }
}