SimulationTime.cpp

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*/

#include <cassert>
#include <cmath>
#include "SimulationTime.hpp"

SimulationTime* SimulationTime::mpInstance = nullptr;

boost::shared_ptr<TimeStepper> SimulationTime::mpTimeStepper;

SimulationTime* SimulationTime::Instance()
{
    if (mpInstance == nullptr)
    {
        mpInstance = new SimulationTime;
        mpTimeStepper.reset();
        std::atexit(Destroy);
    }
    return mpInstance;
}

SimulationTime::SimulationTime()
    :
      mStartTime(DOUBLE_UNSET)
{
    // Make sure there's only one instance - enforces correct serialization
    assert(mpInstance == nullptr);
}

void SimulationTime::Destroy()
{
    if (mpInstance)
    {
        delete mpInstance;
        mpInstance = nullptr;
    }
}

double SimulationTime::GetTimeStep() const
{
    assert(mpTimeStepper);
    return mpTimeStepper->GetIdealTimeStep();
}

void SimulationTime::IncrementTimeOneStep()
{
    assert(mpTimeStepper);
    mpTimeStepper->AdvanceOneTimeStep(); //This can now throw if the end time has been reached
}

unsigned SimulationTime::GetTimeStepsElapsed() const
{
    assert(mpTimeStepper);
    return mpTimeStepper->GetTotalTimeStepsTaken();
}

double SimulationTime::GetTime() const
{
    // NOTE: if this assertion fails, it may be because Destroy() wasn't called in the previous test
    assert(mStartTime != DOUBLE_UNSET);
    //Check if the time stepping has started
    if (mpTimeStepper)
    {
        return mpTimeStepper->GetTime();
    }
    //If time stepping hasn't started then we are still at start time
    return mStartTime;
}

void SimulationTime::SetStartTime(double startTime)
{
    assert(mStartTime == DOUBLE_UNSET);
    mStartTime = startTime;
}

void SimulationTime::SetEndTimeAndNumberOfTimeSteps(double endTime, unsigned totalTimeStepsInSimulation)
{
    // NOTE: if this assertion fails, it may be because Destroy() wasn't called in the previous test
    assert(mStartTime != DOUBLE_UNSET);
    assert(!mpTimeStepper);
    assert(endTime > mStartTime);
    assert(totalTimeStepsInSimulation != 0u);

    mpTimeStepper.reset(new TimeStepper(mStartTime, endTime, (endTime-mStartTime)/totalTimeStepsInSimulation, true));
}

void SimulationTime::ResetEndTimeAndNumberOfTimeSteps(const double& rEndTime, const unsigned& rNumberOfTimeStepsInThisRun)
{
    // NOTE: if this assertion fails, it may be because Destroy() wasn't called in the previous test
    assert(mStartTime != DOUBLE_UNSET);
    // NOTE: If this assertion fails, you should be using set rather than reset
    assert(mpTimeStepper);
    mStartTime = mpTimeStepper->GetTime();

    assert(rEndTime > mStartTime);

    // Reset the machinery that works out the time
    mpTimeStepper.reset(new TimeStepper(mStartTime, rEndTime, (rEndTime-mStartTime)/rNumberOfTimeStepsInThisRun, true));
}

bool SimulationTime::IsStartTimeSetUp() const
{
    return (mStartTime != DOUBLE_UNSET);
}

bool SimulationTime::IsEndTimeAndNumberOfTimeStepsSetUp() const
{
    if (mpTimeStepper)
    {
        return true;
    }
    else
    {
        return false;
    }
}

bool SimulationTime::IsFinished() const
{
    // assert(mpTimeStepper);
    return(mpTimeStepper->IsTimeAtEnd());
}