Timer.h

/*
GRT MIT License
Copyright (c) <2012> <Nicholas Gillian, Media Lab, MIT>

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.
*/

#ifndef GRT_TIMER_HEADER
#define GRT_TIMER_HEADER

#include "GRTVersionInfo.h"
#include "GRTTypedefs.h"

//Include the platform specific time headers
#if defined(__GRT_WINDOWS_BUILD__)
 #include <windows.h>
    #include <mmsystem.h>
#endif

#if defined(__GRT_OSX_BUILD__)
    #include <sys/time.h>
#endif

#if defined(__GRT_LINUX_BUILD__)
    #include <sys/time.h>
#endif

GRT_BEGIN_NAMESPACE

class Timer{
public:
    Timer(){
        timerMode = NORMAL_MODE;
        timerState = NOT_RUNNING;
        timerRunning = false;
    }

    ~Timer(){}

    bool start(){
        startTime = getSystemTime();
        timerRunning = true;
        timerMode = NORMAL_MODE;
        timerState = RUNNING;
        return true;
    }

    bool start(unsigned long countDownTime,unsigned long prepTime = 0){
        if( countDownTime > 0 ){
            startTime = getSystemTime();
            timerRunning = true;
            this->countDownTime = countDownTime;
            this->prepTime = prepTime;
            timerMode = COUNTDOWN_MODE;

            if( prepTime > 0 ){
                timerState = PREP_STATE;
            }else{
                timerState = COUNTDOWN_STATE;
            }
            
            return true;
        }
        return false;
    }
    
    bool stop(){
        timerRunning = false;
        timerState = NOT_RUNNING;
        return true;
    }

    signed long getMilliSeconds() {
        if( !timerRunning ) return 0;

        unsigned long now = getSystemTime();

        switch( timerMode ){
            case NORMAL_MODE:
                return (now-startTime);
                break;
            case COUNTDOWN_MODE:
                if( timerState == PREP_STATE ){
                    if( now-startTime >= prepTime ){
                        timerState = COUNTDOWN_STATE;
                        startTime = now;
                        return countDownTime;
                    }
                    return countDownTime;
                }
                if( timerState == COUNTDOWN_STATE ) return (countDownTime - (now-startTime));
                break;
            default:
                return 0;
                break;
        }

        return 0;
    }
    
    Float getSeconds() {
        if( !timerRunning ) return 0;
        return getMilliSeconds()/1000.0;
    }

    bool running() { return getTimerRunning(); }

    bool getTimerRunning() {
        if( !timerRunning ){
            return false;
        }
        if( getMilliSeconds() > 0 ) return false;
        return true;
    }

    bool getTimerReached() {
     if( !timerRunning ){
            return false;
        }
        if( getMilliSeconds() > 0 ) return false;
        return true;
 }

    bool getInPrepState() const {
        return timerState == PREP_STATE;
    }

    bool getInCountdownState() const {
        return timerState == COUNTDOWN_STATE;
    }
 
 bool timerReached() {
  return getTimerReached();
    }

    static unsigned long getSystemTime( ){
#ifdef __GRT_OSX_BUILD__
        struct timeval now;
        gettimeofday( &now, NULL );
        return now.tv_usec/1000 + now.tv_sec*1000;
#endif
#ifdef __GRT_WINDOWS_BUILD__
        SYSTEMTIME systemTime;
        GetSystemTime(&systemTime);
        return (systemTime.wHour*60*60*1000) + (systemTime.wMinute*60*1000) + (systemTime.wSecond*1000) + systemTime.wMilliseconds;
#endif
#ifdef __GRT_LINUX_BUILD__
        struct timeval now;
        gettimeofday( &now, NULL );
        return now.tv_usec/1000 + now.tv_sec*1000;
#endif
        return 0;
    }

protected:
    enum TimerMode {NORMAL_MODE=0,COUNTDOWN_MODE};
    enum TimerState {NOT_RUNNING=0,RUNNING,COUNTDOWN_STATE,PREP_STATE};

    unsigned long startTime;
    unsigned long countDownTime;
    unsigned long prepTime;
    bool timerRunning;
    TimerMode timerMode;
    TimerState timerState;

};

GRT_END_NAMESPACE

#endif //GRT_TIMER_HEADER