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

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

Copyright(c) 2018 jwellbelove

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******************************************************************************/

#include "UnitTest++.h"

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

#include "queue_spsc_atomic.h"

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

#define REALTIME_TEST 0

namespace
{
  SUITE(test_queue_atomic)
  {
    //*************************************************************************
    TEST(test_constructor)
    {
      etl::queue_spsc_atomic<int, 4> queue;

      CHECK_EQUAL(4U, queue.max_size());
      CHECK_EQUAL(4U, queue.capacity());
    }

    //*************************************************************************
    TEST(test_size_push_pop)
    {
      etl::queue_spsc_atomic<int, 4> queue;

      CHECK_EQUAL(0U, queue.size());

      CHECK_EQUAL(4U, queue.available());
      CHECK_EQUAL(0U, queue.size());

      queue.push(1);
      CHECK_EQUAL(1U, queue.size());
      CHECK_EQUAL(3U, queue.available());

      queue.push(2);
      CHECK_EQUAL(2U, queue.size());
      CHECK_EQUAL(2U, queue.available());

      queue.push(3);
      CHECK_EQUAL(3U, queue.size());
      CHECK_EQUAL(1U, queue.available());

      queue.push(4);
      CHECK_EQUAL(4U, queue.size());
      CHECK_EQUAL(0U, queue.available());

      CHECK(!queue.push(5));
      CHECK(!queue.push(5));

      int i;

      CHECK(queue.pop(i));
      CHECK_EQUAL(1, i);
      CHECK_EQUAL(3U, queue.size());

      CHECK(queue.pop(i));
      CHECK_EQUAL(2, i);
      CHECK_EQUAL(2U, queue.size());

      CHECK(queue.pop(i));
      CHECK_EQUAL(3, i);
      CHECK_EQUAL(1U, queue.size());

      CHECK(queue.pop(i));
      CHECK_EQUAL(4, i);
      CHECK_EQUAL(0U, queue.size());

      CHECK(!queue.pop(i));
      CHECK(!queue.pop(i));
    }

    //*************************************************************************
    TEST(test_size_push_pop_iqueue)
    {
      etl::queue_spsc_atomic<int, 4> queue;

      etl::iqueue_spsc_atomic<int>& iqueue = queue;

      CHECK_EQUAL(0U, iqueue.size());

      iqueue.push(1);
      CHECK_EQUAL(1U, iqueue.size());

      iqueue.push(2);
      CHECK_EQUAL(2U, iqueue.size());

      iqueue.push(3);
      CHECK_EQUAL(3U, iqueue.size());

      iqueue.push(4);
      CHECK_EQUAL(4U, iqueue.size());

      CHECK(!iqueue.push(5));
      CHECK(!iqueue.push(5));

      int i;

      CHECK(iqueue.pop(i));
      CHECK_EQUAL(1, i);
      CHECK_EQUAL(3U, iqueue.size());

      CHECK(iqueue.pop(i));
      CHECK_EQUAL(2, i);
      CHECK_EQUAL(2U, iqueue.size());

      CHECK(iqueue.pop(i));
      CHECK_EQUAL(3, i);
      CHECK_EQUAL(1U, iqueue.size());

      CHECK(iqueue.pop(i));
      CHECK_EQUAL(4, i);
      CHECK_EQUAL(0U, iqueue.size());

      CHECK(!iqueue.pop(i));
      CHECK(!iqueue.pop(i));
    }

    //*************************************************************************
    TEST(test_size_push_pop_void)
    {
      etl::queue_spsc_atomic<int, 4> queue;

      CHECK_EQUAL(0U, queue.size());

      queue.push(1);
      CHECK_EQUAL(1U, queue.size());

      queue.push(2);
      CHECK_EQUAL(2U, queue.size());

      queue.push(3);
      CHECK_EQUAL(3U, queue.size());

      queue.push(4);
      CHECK_EQUAL(4U, queue.size());

      CHECK(!queue.push(5));
      CHECK(!queue.push(5));

      CHECK(queue.pop());
      CHECK_EQUAL(3U, queue.size());

      CHECK(queue.pop());
      CHECK_EQUAL(2U, queue.size());

      CHECK(queue.pop());
      CHECK_EQUAL(1U, queue.size());

      CHECK(queue.pop());
      CHECK_EQUAL(0U, queue.size());

      CHECK(!queue.pop());
      CHECK(!queue.pop());
    }

    //*************************************************************************
    TEST(test_clear)
    {
      etl::queue_spsc_atomic<int, 4> queue;

      CHECK_EQUAL(0U, queue.size());

      queue.push(1);
      queue.push(2);
      queue.clear();
      CHECK_EQUAL(0U, queue.size());

      // Do it again to check that clear() didn't screw up the internals.
      queue.push(1);
      queue.push(2);
      CHECK_EQUAL(2U, queue.size());
      queue.clear();
      CHECK_EQUAL(0U, queue.size());
    }

    //*************************************************************************
    TEST(test_empty)
    {
      etl::queue_spsc_atomic<int, 4> queue;
      CHECK(queue.empty());

      queue.push(1);
      CHECK(!queue.empty());

      queue.clear();
      CHECK(queue.empty());

      queue.push(1);
      CHECK(!queue.empty());
    }

    //*************************************************************************
    TEST(test_full)
    {
      etl::queue_spsc_atomic<int, 4> queue;
      CHECK(!queue.full());

      queue.push(1);
      queue.push(2);
      queue.push(3);
      queue.push(4);
      CHECK(queue.full());

      queue.clear();
      CHECK(!queue.full());

      queue.push(1);
      queue.push(2);
      queue.push(3);
      queue.push(4);
      CHECK(queue.full());
    }

    //=========================================================================
#if REALTIME_TEST && defined(ETL_COMPILER_MICROSOFT)
    #if defined(ETL_TARGET_OS_WINDOWS) // Only Windows priority is currently supported
      #define FIX_PROCESSOR_AFFINITY1 SetThreadAffinityMask(GetCurrentThread(), 1);
      #define FIX_PROCESSOR_AFFINITY2 SetThreadAffinityMask(GetCurrentThread(), 2);
    #else
      #error No thread priority modifier defined
    #endif

    size_t ticks = 0;

    etl::queue_spsc_atomic<int, 10> queue;

    const size_t LENGTH = 1000000;

    void timer_event()
    {
      FIX_PROCESSOR_AFFINITY1;

      const size_t TICK = 1;
      size_t tick = TICK;
      ticks = 1;

      while (ticks <= LENGTH)
      {
        if (queue.push(ticks))
        {
          ++ticks;
        }
      }
    }

    TEST(queue_threads)
    {
      FIX_PROCESSOR_AFFINITY2;

      std::vector<int> tick_list;
      tick_list.reserve(LENGTH);

      std::thread t1(timer_event);

      while (tick_list.size() < LENGTH)
      {
        int i;

        if (queue.pop(i))
        {
          tick_list.push_back(i);
        }
      }

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

      CHECK_EQUAL(LENGTH, tick_list.size());

      for (size_t i = 0; i < LENGTH; ++i)
      {
        CHECK_EQUAL(i + 1, tick_list[i]);
      }
    }
#endif
  };
}