#ifndef GLTB_CONDITIONVARIABLE_H
#define GLTB_CONDITIONVARIABLE_H

#ifdef WIN32
#include <windows.h>
#else
#include <errno.h>
#include <pthread.h>
#endif

#include "GLTB/mutex.h"
#include "GLTB/referencedobject.h"
#include "GLTB/refptr.h"

namespace gltb {
	class ConditionVariable : public ReferencedObject {
	public:
		ConditionVariable() {
#ifdef WIN32
			InitializeConditionVariable(&conditionVariable);
#else
			pthread_cond_init(&conditionVariable,NULL);
#endif
		}
		
		~ConditionVariable() {
#ifdef WIN32
			// nothing to do here
#else
			pthread_cond_destroy(&conditionVariable);
#endif
		}

		void signal() {
#ifdef WIN32
			WakeConditionVariable(&conditionVariable);
#else
			pthread_cond_signal(&conditionVariable);
#endif
		}

		void signalAll() {
#ifdef WIN32
			WakeAllConditionVariable(&conditionVariable);
#else
			pthread_cond_broadcast(&conditionVariable);
#endif
		}

		/**
		 * Wait indefinitely for the variable to be signaled.
		 */
		void wait(gltb::RefPtr<Mutex> mutex) {
#ifdef WIN32
			SleepConditionVariableCS(&conditionVariable, mutex->_getNative(), INFINITE);
#else
			pthread_cond_wait(&conditionVariable, mutex->_getNative());
#endif
		}

		/**
		 * Wait for the variable to be signaled or until the time runs out.
		 *
		 * @param timeout timeout in millisecons
		 * @returns true if variable was signaled, false if a timeout occurred
		 */
		bool wait(gltb::RefPtr<Mutex> mutex, int timeout) {
#ifdef WIN32
			int result = SleepConditionVariableCS(&conditionVariable, mutex->_getNative(), timeout);

			int error = GetLastError();
			if(error == ERROR_TIMEOUT) {
				return false;
			}
			return true;
#else
			timespec duration;
			duration.tv_sec = timeout / 1000;
			duration.tv_nsec = (timeout - duration.tv_sec * 1000) * 1000000;
			int result = pthread_cond_timedwait(&conditionVariable, mutex->_getNative(), &duration);

			if(result == ETIMEDOUT) {
				return false;
			}
			return true;
#endif
		}

	private:
#ifdef WIN32
		CONDITION_VARIABLE conditionVariable;
#else
		pthread_cond_t conditionVariable;
#endif
	};
}
#endif