#include <MTScheduler.h>

namespace MT
{
	namespace internal
	{
		static const size_t TASK_BUFFER_CAPACITY = 4096;

		ThreadContext::ThreadContext()
			: lastActiveFiberContext(nullptr)
			, taskScheduler(nullptr)
			, hasNewTasksEvent(EventReset::AUTOMATIC, true)
			, state(ThreadState::ALIVE)
			, descBuffer(TASK_BUFFER_CAPACITY)
		{
		}

		ThreadContext::~ThreadContext()
		{
		}

		void ThreadContext::RestoreAwaitingTasks(TaskGroup::Type taskGroup)
		{
			ASSERT(taskScheduler, "Invalid Task Scheduler");
			ASSERT(taskScheduler->IsWorkerThread(), "Can't use RunAsync outside Task. Use TaskScheduler.RunAsync() instead.");

			ConcurrentQueueLIFO<FiberContext*> & groupQueue = taskScheduler->waitTaskQueues[taskGroup];

			if (groupQueue.IsEmpty())
			{
				return;
			}

			//copy awaiting tasks list to stack
			stack_array<FiberContext*, MT_MAX_FIBERS_COUNT> groupQueueCopy(MT_MAX_FIBERS_COUNT, nullptr);
			size_t taskCount = groupQueue.PopAll(groupQueueCopy.begin(), groupQueueCopy.size());

			fixed_array<internal::GroupedTask> buffer(&descBuffer.front(), taskCount);

			TaskScheduler & scheduler = *(taskScheduler);
			size_t bucketCount = Min((size_t)scheduler.GetWorkerCount(), taskCount);
			fixed_array<internal::TaskBucket>	buckets(ALLOCATE_ON_STACK(sizeof(internal::TaskBucket) * bucketCount), bucketCount);

			internal::DistibuteDescriptions(TaskGroup::GROUP_UNDEFINED, groupQueueCopy.begin(), buffer, buckets);
			scheduler.RunTasksImpl(buckets, nullptr, true);
		}

	}

}