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/* Author: Matt Maly */

#include "ompl/control/planners/syclop/SyclopEST.h"
#include "ompl/base/goals/GoalSampleableRegion.h"

void ompl::control::SyclopEST::setup()
{
    Syclop::setup();
    sampler_ = si_->allocStateSampler();
    controlSampler_ = siC_->allocControlSampler();
    lastGoalMotion_ = NULL;
}

void ompl::control::SyclopEST::clear()
{
    Syclop::clear();
    freeMemory();
    motions_.clear();
    lastGoalMotion_ = NULL;
}

void ompl::control::SyclopEST::getPlannerData(base::PlannerData &data) const
{
    Planner::getPlannerData(data);

    double delta = siC_->getPropagationStepSize();

    if (lastGoalMotion_)
        data.addGoalVertex(lastGoalMotion_->state);

    for (size_t i = 0; i < motions_.size(); ++i)
    {
        if (motions_[i]->parent)
        {
            if (data.hasControls())
                data.addEdge (base::PlannerDataVertex(motions_[i]->parent->state),
                              base::PlannerDataVertex(motions_[i]->state),
                              control::PlannerDataEdgeControl (motions_[i]->control, motions_[i]->steps * delta));
            else
                data.addEdge (base::PlannerDataVertex(motions_[i]->parent->state),
                              base::PlannerDataVertex(motions_[i]->state));
        }
        else
            data.addStartVertex (base::PlannerDataVertex(motions_[i]->state));
    }
}

ompl::control::Syclop::Motion* ompl::control::SyclopEST::addRoot(const base::State *s)
{
    Motion *motion = new Motion(siC_);
    si_->copyState(motion->state, s);
    siC_->nullControl(motion->control);
    motions_.push_back(motion);
    return motion;
}

void ompl::control::SyclopEST::selectAndExtend(Region &region, std::vector<Motion*>& newMotions)
{
    Motion *treeMotion = region.motions[rng_.uniformInt(0, region.motions.size()-1)];
    Control *rctrl = siC_->allocControl();
    base::State *newState = si_->allocState();

    controlSampler_->sample(rctrl, treeMotion->state);
    unsigned int duration = controlSampler_->sampleStepCount(siC_->getMinControlDuration(), siC_->getMaxControlDuration());
    duration = siC_->propagateWhileValid(treeMotion->state, rctrl, duration, newState);

    if (duration >= siC_->getMinControlDuration())
    {
        Motion *motion = new Motion(siC_);
        si_->copyState(motion->state, newState);
        siC_->copyControl(motion->control, rctrl);
        motion->steps = duration;
        motion->parent = treeMotion;
        motions_.push_back(motion);
        newMotions.push_back(motion);

        lastGoalMotion_ = motion;
    }

    siC_->freeControl(rctrl);
    si_->freeState(newState);
}

void ompl::control::SyclopEST::freeMemory()
{
    for (std::vector<Motion*>::iterator i = motions_.begin(); i != motions_.end(); ++i)
    {
        Motion *m = *i;
        if (m->state)
            si_->freeState(m->state);
        if (m->control)
            siC_->freeControl(m->control);
        delete m;
    }
}
