#                Chronos Test Suite
#            (c) Copyright 2020-Present
#         Status Research & Development GmbH
#
#              Licensed under either of
#  Apache License, version 2.0, (LICENSE-APACHEv2)
#              MIT license (LICENSE-MIT)
import unittest2
import ../chronos, ../chronos/config

{.used.}

suite "Asynchronous utilities test suite":
  when chronosFutureTracking:
    proc getCount(): uint =
      # This procedure counts number of Future[T] in double-linked list via list
      # iteration.
      var res = 0'u
      for item in pendingFutures():
        inc(res)
      res

  test "Future clean and leaks test":
    when chronosFutureTracking:
      if pendingFuturesCount(WithoutCompleted) == 0'u:
        if pendingFuturesCount(OnlyCompleted) > 0'u:
          poll()
        check pendingFuturesCount() == 0'u
      else:
        echo dumpPendingFutures()
        check false
    else:
      skip()

  test "FutureList basics test":
    when chronosFutureTracking:
      var fut1 = newFuture[void]()
      check:
        getCount() == 1'u
        pendingFuturesCount() == 1'u
      var fut2 = newFuture[void]()
      check:
        getCount() == 2'u
        pendingFuturesCount() == 2'u
      var fut3 = newFuture[void]()
      check:
        getCount() == 3'u
        pendingFuturesCount() == 3'u
      fut1.complete()
      poll()
      check:
        getCount() == 2'u
        pendingFuturesCount() == 2'u
      fut2.fail(newException(ValueError, ""))
      poll()
      check:
        getCount() == 1'u
        pendingFuturesCount() == 1'u
      discard fut3.tryCancel()
      poll()
      check:
        getCount() == 0'u
        pendingFuturesCount() == 0'u
    else:
      skip()

  test "FutureList async procedure test":
    when chronosFutureTracking:
      proc simpleProc() {.async.} =
        await sleepAsync(10.milliseconds)

      var fut = simpleProc()
      check:
        getCount() == 2'u
        pendingFuturesCount() == 2'u

      waitFor fut
      check:
        getCount() == 1'u
        pendingFuturesCount() == 1'u

      poll()
      check:
        getCount() == 0'u
        pendingFuturesCount() == 0'u
    else:
      skip()