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/* Author: Beck Chen, Mark Moll */

#ifndef DEMOS_KOULES_PROJECTION_
#define DEMOS_KOULES_PROJECTION_

#include <ompl/base/spaces/RealVectorStateSpace.h>

// A projection for the KoulesStateSpace
class KoulesProjection : public ompl::base::ProjectionEvaluator
{
public:
    KoulesProjection(const ompl::base::StateSpace* space, unsigned int numDimensions = 3)
        : ompl::base::ProjectionEvaluator(space), numDimensions_(numDimensions)
    {
        unsigned int n = (space_->getDimension() - 1) / 2 + 1;
        if (numDimensions_ > n)
            numDimensions_ = n;
        else if (numDimensions_ < 3)
            numDimensions_ = 3;
    }

    virtual unsigned int getDimension() const
    {
        return numDimensions_;
    }
    virtual void defaultCellSizes()
    {
        cellSizes_.resize(numDimensions_, .05);
    }
    // projection with coordinates in the same order as described in Andrew
    // Ladd's thesis: (x,y,theta) of the ship, followed by the positions of
    // the koules (up to the dimensionality of the projection)
    virtual void project(const ompl::base::State *state, ompl::base::EuclideanProjection &projection) const
    {
        const double* x = state->as<ompl::base::RealVectorStateSpace::StateType>()->values;
        unsigned int numKoules = (numDimensions_ - 3) / 2;
        projection[0] = x[0];
        projection[1] = x[1];
        projection[2] = x[2];
        for (unsigned int i = 0; i < numKoules; ++i)
        {
            projection[2 * i + 3] = x[4 * i + 5];
            projection[2 * i + 4] = x[4 * i + 6];
        }
    }
protected:
    unsigned int numDimensions_;
};

#endif
