#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

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#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
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#
#    http://www.apache.org/licenses/LICENSE-2.0
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'''Unittest for EventLooper'''
import time
import unittest2 as unittest

from heron.instance.src.python.network import EventLooper

# pylint: disable=missing-docstring
# pylint: disable=W0212
class EventLooperTest(unittest.TestCase):
  def setUp(self):
    self.looper = EventLooper()
    self.global_value = 6

  def tearDown(self):
    self.looper = None

  def test_loop(self):
    def to_run():
      for _ in range(3):
        self.global_value += 10
        self.looper.wake_up()
      self.looper.exit_loop()

    self.looper.add_wakeup_task(to_run)
    self.looper.loop()
    self.assertEqual(36, self.global_value)

  def test_add_wakeup_task(self):
    def to_run():
      self.looper.exit_loop()
      self.global_value = 10

    self.looper.add_wakeup_task(to_run)
    self.looper.loop()
    self.assertEqual(10, self.global_value)

  def test_register_timer_task(self):
    def to_run():
      self.looper.exit_loop()
      self.global_value = 10

    start_time = time.time()
    interval = 1
    self.looper.register_timer_task_in_sec(to_run, interval)
    self.looper.loop()
    end_time = time.time()
    self.assertAlmostEqual(start_time + interval, end_time, delta=0.05)
    self.assertEqual(10, self.global_value)

  def test_exit_loop(self):
    def to_run():
      self.looper.exit_loop()
      self.global_value = 10

    self.looper.add_wakeup_task(to_run)
    self.looper.loop()
    self.assertEqual(10, self.global_value)

  def test_exit_tasks(self):
    def exit_task():
      self.global_value = 10

    def to_run():
      self.looper.add_exit_task(exit_task)
      self.assertEqual(6, self.global_value)
      self.looper.exit_loop()

    self.looper.add_wakeup_task(to_run)
    self.looper.loop()
    self.assertEqual(10, self.global_value)

  def test_get_next_timeout_interval(self):
    to_run = lambda: None

    interval = 1.0
    self.looper.register_timer_task_in_sec(to_run, interval)
    next_interval = self.looper._get_next_timeout_interval()
    self.assertAlmostEqual(next_interval, interval, delta=0.01)

  def test_run_once(self):
    def to_run():
      self.global_value = 10

    self.looper.add_wakeup_task(to_run)
    self.looper._run_once()
    self.assertEqual(10, self.global_value)

  def test_trigger_timers(self):
    def to_run():
      self.global_value = 10

    interval = 1.0
    self.looper.register_timer_task_in_sec(to_run, interval)

    # run right now, to_run() should not have been executed yet
    self.looper._trigger_timers()
    self.assertEqual(6, self.global_value)

    time.sleep(interval)
    self.looper._trigger_timers()
    self.looper._trigger_timers()
    self.assertEqual(10, self.global_value)