/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2017 John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/

#include "unit_test_framework.h"

#include "etl/callback_timer.h"
#include "etl/function.h"

#include <chrono>
#include <iostream>
#include <thread>
#include <vector>

#if defined(ETL_COMPILER_MICROSOFT)
  #include <Windows.h>
#endif

#define REALTIME_TEST 0

namespace
{
  uint64_t ticks = 0ULL;

  //***************************************************************************
  // Class callback via etl::function
  //***************************************************************************
  class Object
  {
  public:

    Object()
      : p_controller(nullptr)
    {
    }

    void callback()
    {
      tick_list.push_back(ticks);
    }

    void callback2()
    {
      tick_list.push_back(ticks);

      p_controller->start(2);
      p_controller->start(1);
    }

    void set_controller(etl::callback_timer<3>& controller)
    {
      p_controller = &controller;
    }

    std::vector<uint64_t> tick_list;

    etl::callback_timer<3>* p_controller;
  };

  using event_callback_type = etl::icallback_timer::event_callback_type;

  Object        object;

  etl::function_imv<Object, object, &Object::callback>  member_callback;
  etl::function_imv<Object, object, &Object::callback2> member_callback2;

  class TimerTimeToNextTest
  {
  public:

    uint32_t time_to_next;

    TimerTimeToNextTest()
      : time_to_next(0)
    {
    }

    void time_to_next_handler(uint32_t time_to_next_)
    {
      time_to_next = time_to_next_;
    }

    void clear(void)
    {
      time_to_next = 0;
    }
  };

  TimerTimeToNextTest timerTimeToNextTest;

  //***************************************************************************
  // Free function callback via etl::function
  //***************************************************************************
  std::vector<uint64_t> free_tick_list1;

  void free_callback1()
  {
    free_tick_list1.push_back(ticks);
  }

  etl::function_fv<free_callback1> free_function_callback;

  //***************************************************************************
  // Free function callback via function pointer
  //***************************************************************************
  std::vector<uint64_t> free_tick_list2;

  void free_funcrion_callback2()
  {
    free_tick_list2.push_back(ticks);
  }

  SUITE(test_callback_timer)
  {
    //*************************************************************************
    TEST(callback_timer_too_many_timers)
    {
      etl::callback_timer<2> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Single_Shot);

      CHECK(id1 != etl::timer::id::NO_TIMER);
      CHECK(id2 != etl::timer::id::NO_TIMER);
      CHECK(id3 == etl::timer::id::NO_TIMER);

      timer_controller.clear();
      id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Single_Shot);
      CHECK(id3 != etl::timer::id::NO_TIMER);
    }

    //*************************************************************************
    TEST(callback_timer_one_shot)
    {
      etl::callback_timer<4> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Single_Shot);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1UL;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {37};
      std::vector<uint64_t> compare2 = {23};
      std::vector<uint64_t> compare3 = {11};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(message_timer_one_shot_after_timeout)
    {
      etl::callback_timer<1> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Single_Shot);
      object.tick_list.clear();

      timer_controller.start(id1);
      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      // Timer should have timed out.

      CHECK(timer_controller.set_period(id1, 50));
      timer_controller.start(id1);

      object.tick_list.clear();

      ticks = 0;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      // Timer should have timed out.

      CHECK_EQUAL(50U, *object.tick_list.data());

      CHECK(timer_controller.unregister_timer(id1));
      CHECK(!timer_controller.unregister_timer(id1));
      CHECK(!timer_controller.start(id1));
      CHECK(!timer_controller.stop(id1));
    }

    //*************************************************************************
    TEST(callback_timer_repeating)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {37, 74};
      std::vector<uint64_t> compare2 = {23, 46, 69, 92};
      std::vector<uint64_t> compare3 = {11, 22, 33, 44, 55, 66, 77, 88, 99};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_repeating_bigger_step)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      CHECK(!timer_controller.is_running());

      timer_controller.enable(true);

      CHECK(timer_controller.is_running());

      ticks = 0;

      const uint32_t step = 5U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {40, 75};
      std::vector<uint64_t> compare2 = {25, 50, 70, 95};
      std::vector<uint64_t> compare3 = {15, 25, 35, 45, 55, 70, 80, 90, 100};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_repeating_stop_start)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        if (ticks == 40)
        {
          timer_controller.start(id1);
          timer_controller.stop(id2);
        }

        if (ticks == 80)
        {
          timer_controller.stop(id1);
          timer_controller.start(id2);
        }

        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {77};
      std::vector<uint64_t> compare2 = {23};
      std::vector<uint64_t> compare3 = {11, 22, 33, 44, 55, 66, 77, 88, 99};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_timer_starts_timer_small_step)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback2, 100, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(member_callback, 10, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(member_callback, 22, etl::timer::mode::Single_Shot);

      (void)id2;
      (void)id3;

      object.set_controller(timer_controller);

      object.tick_list.clear();

      timer_controller.start(id1);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 200U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {100, 110, 122};

      CHECK(object.tick_list.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
    }

    //*************************************************************************
    TEST(callback_timer_timer_starts_timer_big_step)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback2, 100, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(member_callback, 10, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(member_callback, 22, etl::timer::mode::Single_Shot);

      (void)id2;
      (void)id3;

      object.set_controller(timer_controller);

      object.tick_list.clear();

      timer_controller.start(id1);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 3;

      while (ticks <= 200U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {102, 111, 123};

      CHECK(object.tick_list.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
    }

    //*************************************************************************
    TEST(callback_timer_repeating_register_unregister)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1;
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        if (ticks == 40)
        {
          timer_controller.unregister_timer(id2);

          id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
          timer_controller.start(id1);
        }

        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {77};
      std::vector<uint64_t> compare2 = {23};
      std::vector<uint64_t> compare3 = {11, 22, 33, 44, 55, 66, 77, 88, 99};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_repeating_clear)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;

        if (ticks == 40)
        {
          timer_controller.clear();
        }

        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {37};
      std::vector<uint64_t> compare2 = {23};
      std::vector<uint64_t> compare3 = {11, 22, 33};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_delayed_immediate)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.enable(true);

      ticks = 5;
      timer_controller.tick(uint32_t(ticks));

      timer_controller.start(id1, etl::timer::start::Immediate);
      timer_controller.start(id2, etl::timer::start::Immediate);
      timer_controller.start(id3, etl::timer::start::Delayed);

      const uint32_t step = 1U;

      while (ticks <= 100U)
      {
        ticks += step;
        timer_controller.tick(step);
      }

      std::vector<uint64_t> compare1 = {6, 42, 79};
      std::vector<uint64_t> compare2 = {6, 28, 51, 74, 97};
      std::vector<uint64_t> compare3 = {16, 27, 38, 49, 60, 71, 82, 93};

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(), compare2.size());
      CHECK_ARRAY_EQUAL(compare3.data(), free_tick_list2.data(), compare3.size());
    }

    //*************************************************************************
    TEST(callback_timer_one_shot_big_step_short_delay_insert)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(free_callback1, 15, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(free_funcrion_callback2, 5, etl::timer::mode::Repeating);

      free_tick_list1.clear();
      free_tick_list2.clear();

      timer_controller.start(id1);
      timer_controller.start(id2);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 11U;

      ticks += step;
      timer_controller.tick(step);

      ticks += step;
      timer_controller.tick(step);

      std::vector<uint64_t> compare1 = {22};
      std::vector<uint64_t> compare2 = {11, 11, 22, 22};

      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), free_tick_list1.data(), compare1.size());
      CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list2.data(), compare2.size());
    }

    //*************************************************************************
    TEST(callback_timer_one_shot_empty_list_huge_tick_before_insert)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(free_callback1, 5, etl::timer::mode::Single_Shot);

      free_tick_list1.clear();

      timer_controller.start(id1);

      timer_controller.enable(true);

      ticks = 0;

      const uint32_t step = 5U;

      for (uint32_t i = 0U; i < step; ++i)
      {
        ++ticks;
        timer_controller.tick(1);
      }

      // Huge tick count.
      timer_controller.tick(UINT32_MAX - step + 1);

      timer_controller.start(id1);

      for (uint32_t i = 0U; i < step; ++i)
      {
        ++ticks;
        timer_controller.tick(1);
      }
      std::vector<uint64_t> compare1 = {5, 10};

      CHECK(free_tick_list1.size() != 0);

      CHECK_ARRAY_EQUAL(compare1.data(), free_tick_list1.data(), compare1.size());
    }

    //*************************************************************************
    TEST(message_timer_time_to_next_repeating)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Repeating);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Repeating);

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      CHECK_EQUAL(11, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(4, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(8, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(1, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(5, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(2, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(2, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(6, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(10, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(3, timer_controller.time_to_next());

      timer_controller.tick(7);
      CHECK_EQUAL(4, timer_controller.time_to_next());
    }

    //*************************************************************************
    TEST(message_timer_time_to_next_with_has_active_timer)
    {
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 11, etl::timer::mode::Single_Shot);

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      timer_controller.enable(true);

      timer_controller.tick(11);
      CHECK_EQUAL(12, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(23);
      CHECK_EQUAL(3, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(2);
      CHECK_EQUAL(1, timer_controller.time_to_next());
      CHECK_TRUE(timer_controller.has_active_timer());

      timer_controller.tick(1);
      CHECK_EQUAL(static_cast<etl::timer::interval::type>(etl::timer::interval::No_Active_Interval), timer_controller.time_to_next());
      CHECK_FALSE(timer_controller.has_active_timer());
    }

    //*************************************************************************
    class test_object
    {
    public:

      void call()
      {
        ++called;
      }

      size_t called = 0UL;
    };

    using callback_type = etl::icallback_timer::callback_type;

    TEST(callback_timer_call_etl_delegate)
    {
      test_object            test_obj;
      callback_type          delegate_callback = callback_type::create<test_object, &test_object::call>(test_obj);
      etl::callback_timer<1> timer_controller;

      timer_controller.enable(true);

      etl::timer::id::type id = timer_controller.register_timer(delegate_callback, 5, etl::timer::mode::Single_Shot);
      timer_controller.start(id);

      timer_controller.tick(4);
      CHECK(test_obj.called == 0);

      timer_controller.tick(2);
      CHECK(test_obj.called == 1);
    }

    //*************************************************************************
    // Tick	ID1	ID2	ID3
    //   0   .   .   .
    //   1	 .   .   .
    //   2	 .   .   .
    //   3	 .   .   .
    //   4	 .   .   .
    //   5	 .   .   .
    //   6	 .   .   .
    //   7	 .   .   .
    //   8	 .   .   .
    //   9	 .   .   O
    //  10	 .   .   .
    //  11	 .   .   .
    //  12	 .   .   .
    //  13	 .   .   .
    //  14	 .   .   .
    //  15	 .   .   .
    //  16	 .   .   .
    //  17	 .   .   .
    //  18	 .   .   O
    //  19	 .   .   .
    //  20	 .   .   .
    //  21	 .   .   .
    //  22	 .   .   .
    //  23	 .   O   .
    //  24	 .   .   .
    //  25	 .   .   .
    //  26	 .   .   .
    //  27	 .   .   O
    //  28	 .   .   .
    //  29	 .   .   .
    //  30	 .   .   .
    //  31	 .   .   .
    //  32	 .   .   .
    //  33	 .   .   .
    //  34	 .   .   .
    //  35	 .   .   .
    //  36	 .   .   O
    //  37	 O   .   .
    //
    TEST(callback_timer_is_active_and_time_to_next)
    {
      timerTimeToNextTest.clear();
      etl::callback_timer<3> timer_controller;

      etl::timer::id::type id1 = timer_controller.register_timer(member_callback, 37, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = timer_controller.register_timer(free_function_callback, 23, etl::timer::mode::Single_Shot);
      etl::timer::id::type id3 = timer_controller.register_timer(free_funcrion_callback2, 9, etl::timer::mode::Repeating);

      timer_controller.set_time_to_next_callback(
        event_callback_type::create<TimerTimeToNextTest, timerTimeToNextTest, &TimerTimeToNextTest::time_to_next_handler>());

      timer_controller.start(id1);
      timer_controller.start(id3);
      timer_controller.start(id2);

      CHECK_EQUAL(9, timerTimeToNextTest.time_to_next); // The time to next should be the interval for id3.

      timer_controller.enable(true);

      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_TRUE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      CHECK_EQUAL(9, timerTimeToNextTest.time_to_next); // The time to next should be the interval for id3.

      // Tick the time for id3 to expire.
      timer_controller.tick(9);
      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_TRUE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      CHECK_EQUAL(9, timerTimeToNextTest.time_to_next); // The time to next should be the what's left of the interval for id3.

      // Stop the timer and check that the time to next is updated to that of id2.
      timer_controller.stop(id3);
      CHECK_EQUAL(14, timerTimeToNextTest.time_to_next); // The time to next should be the what's left of the interval for id2.

      // Start the timer again and check that the time to next is updated to the interval for id3.
      timer_controller.start(id3);
      CHECK_EQUAL(9, timerTimeToNextTest.time_to_next);

      // Tick the time for id3 to expire.
      timer_controller.tick(9);
      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_TRUE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      // The time to next should be the what's left of the interval for id2.
      CHECK_EQUAL(5, timerTimeToNextTest.time_to_next);

      // Tick the remaining time for id2 to expire.
      timer_controller.tick(5);
      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_FALSE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      // The time to next should be the what's left of the interval for id3.
      CHECK_EQUAL(4, timerTimeToNextTest.time_to_next);

      // Tick the remaining time for id3 to expire.
      timer_controller.tick(4);
      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_FALSE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      // The time to next should be the what's left of the interval for id3.
      CHECK_EQUAL(9, timerTimeToNextTest.time_to_next);

      // Tick the remaining time for id3 to expire.
      timer_controller.tick(9);
      CHECK_TRUE(timer_controller.is_active(id1));
      CHECK_FALSE(timer_controller.is_active(id2));
      CHECK_TRUE(timer_controller.is_active(id3));

      // The time to next should be the what's left of the interval for id1.
      CHECK_EQUAL(1, timerTimeToNextTest.time_to_next);

      // Stop timer id3 so that id1 is the last timeout.
      timer_controller.stop(id3);

      // Tick the remaining time for id1 to expire.
      timer_controller.tick(1);
      CHECK_FALSE(timer_controller.is_active(id1));
      CHECK_FALSE(timer_controller.is_active(id2));
      CHECK_FALSE(timer_controller.is_active(id3));

      // There are no active timers so the time to next should be No_Active_Interval.
      CHECK_EQUAL(etl::timer::interval::No_Active_Interval, timerTimeToNextTest.time_to_next);
    }

    //*************************************************************************
#if REALTIME_TEST

  #if defined(ETL_TARGET_OS_WINDOWS) // Only Windows priority is currently
                                     // supported
    #define RAISE_THREAD_PRIORITY  SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST)
    #define FIX_PROCESSOR_AFFINITY SetThreadAffinityMask(GetCurrentThread(), 1);
  #else
    #define RAISE_THREAD_PRIORITY
    #define FIX_PROCESSOR_AFFINITY
  #endif

    etl::callback_timer<3> controller;

    void timer_event()
    {
      const uint32_t TICK = 1U;
      uint32_t       tick = TICK;
      ticks               = 1U;

      RAISE_THREAD_PRIORITY;
      FIX_PROCESSOR_AFFINITY;

      while (ticks <= 1000U)
      {
        std::this_thread::sleep_for(std::chrono::milliseconds(1));

        if (controller.tick(tick))
        {
          tick = TICK;
        }
        else
        {
          tick += TICK;
        }

        ++ticks;
      }
    }

    TEST(callback_timer_threads)
    {
      FIX_PROCESSOR_AFFINITY;

      etl::timer::id::type id1 = controller.register_timer(member_callback, 400, etl::timer::mode::Single_Shot);
      etl::timer::id::type id2 = controller.register_timer(free_function_callback, 100, etl::timer::mode::Repeating);
      etl::timer::id::type id3 = controller.register_timer(free_funcrion_callback2, 10, etl::timer::mode::Repeating);

      object.tick_list.clear();
      free_tick_list1.clear();
      free_tick_list2.clear();

      controller.start(id1);
      controller.start(id2);
      // controller.start(id3);

      controller.enable(true);

      std::thread t1(timer_event);

      bool restart_1 = true;

      while (ticks <= 1000U)
      {
        if ((ticks > 200U) && (ticks < 500U))
        {
          controller.stop(id3);
        }

        if ((ticks > 600U) && (ticks < 800U))
        {
          controller.start(id3);
        }

        if ((ticks > 500U) && restart_1)
        {
          controller.start(id1);
          restart_1 = false;
        }

        std::this_thread::sleep_for(std::chrono::milliseconds(1));
      }

      // Join the thread with the main thread
      t1.join();

      CHECK_EQUAL(2U, object.tick_list.size());
      CHECK_EQUAL(10U, free_tick_list1.size());
      CHECK(free_tick_list2.size() < 65U);

      // std::vector<uint64_t> compare1 = { 400, 900 };
      // std::vector<uint64_t> compare2 = { 100, 200, 300, 400, 500, 600, 700,
      // 800, 900, 1000 };

      CHECK(object.tick_list.size() != 0);
      CHECK(free_tick_list1.size() != 0);
      CHECK(free_tick_list2.size() != 0);

      // CHECK_ARRAY_EQUAL(compare1.data(), object.tick_list.data(),
      // min(compare1.size(), object.tick_list.size()));
      // CHECK_ARRAY_EQUAL(compare2.data(), free_tick_list1.data(),
      // min(compare2.size(), free_tick_list1.size()));
    }
#endif
  }
} // namespace