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/*
 * Copyright (c) 2014-2016 by its authors. Some rights reserved.
 * See the project homepage at: https://monix.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package monix.execution.schedulers

import java.util.concurrent.TimeUnit
import monix.execution.schedulers.Timer.{clearTimeout, setTimeout}
import monix.execution.{Cancelable, UncaughtExceptionReporter}

/** An `AsyncScheduler` schedules tasks to be executed asynchronously,
  * either now or in the future, by means of Javascript's `setTimeout`.
  */
final class AsyncScheduler private (
  reporter: UncaughtExceptionReporter,
  override val executionModel: ExecutionModel)
  extends ReferenceScheduler {

  override def scheduleOnce(initialDelay: Long, unit: TimeUnit, r: Runnable): Cancelable = {
    val millis = {
      val v = TimeUnit.MILLISECONDS.convert(initialDelay, unit)
      if (v < 0) 0L else v
    }

    val task = setTimeout(millis, r, reporter)
    Cancelable(() => clearTimeout(task))
  }

  override def execute(runnable: Runnable): Unit = {
    setTimeout(0L, runnable, reporter)
  }

  override def reportFailure(t: Throwable): Unit =
    reporter.reportFailure(t)
}

object AsyncScheduler {
  /** Builder for [[AsyncScheduler]].
    *
    * @param reporter is the [[UncaughtExceptionReporter]] that logs uncaught exceptions.
    * @param executionModel is the preferred [[ExecutionModel]], a guideline
    *        for run-loops and producers of data.
    */
  def apply(reporter: UncaughtExceptionReporter,
    executionModel: ExecutionModel): AsyncScheduler =
    new AsyncScheduler(reporter, executionModel)
}