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/* Author: Ioan Sucan */

#include "ompl/base/spaces/RealVectorStateProjections.h"
#include "ompl/util/Exception.h"
#include "ompl/tools/config/MagicConstants.h"
#include <cstring>
#include <utility>

/// @cond IGNORE
namespace ompl
{
    namespace base
    {
        static inline void checkSpaceType(const StateSpace *m)
        {
            if (!dynamic_cast<const RealVectorStateSpace *>(m))
                throw Exception("Expected real vector state space for projection");
        }
    }
}
/// @endcond

ompl::base::RealVectorLinearProjectionEvaluator::RealVectorLinearProjectionEvaluator(
    const StateSpace *space, const std::vector<double> &cellSizes, const ProjectionMatrix::Matrix &projection)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    projection_.mat = projection;
    setCellSizes(cellSizes);
}

ompl::base::RealVectorLinearProjectionEvaluator::RealVectorLinearProjectionEvaluator(
    const StateSpacePtr &space, const std::vector<double> &cellSizes, const ProjectionMatrix::Matrix &projection)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    projection_.mat = projection;
    setCellSizes(cellSizes);
}

ompl::base::RealVectorLinearProjectionEvaluator::RealVectorLinearProjectionEvaluator(
    const StateSpace *space, const ProjectionMatrix::Matrix &projection)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    projection_.mat = projection;
}

ompl::base::RealVectorLinearProjectionEvaluator::RealVectorLinearProjectionEvaluator(
    const StateSpacePtr &space, const ProjectionMatrix::Matrix &projection)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    projection_.mat = projection;
}

ompl::base::RealVectorOrthogonalProjectionEvaluator::RealVectorOrthogonalProjectionEvaluator(
    const StateSpace *space, const std::vector<double> &cellSizes, std::vector<unsigned int> components)
  : ProjectionEvaluator(space), components_(std::move(components))
{
    checkSpaceType(space_);
    setCellSizes(cellSizes);
    copyBounds();
}

ompl::base::RealVectorOrthogonalProjectionEvaluator::RealVectorOrthogonalProjectionEvaluator(
    const StateSpacePtr &space, const std::vector<double> &cellSizes, std::vector<unsigned int> components)
  : ProjectionEvaluator(space), components_(std::move(components))
{
    checkSpaceType(space_);
    setCellSizes(cellSizes);
    copyBounds();
}

ompl::base::RealVectorOrthogonalProjectionEvaluator::RealVectorOrthogonalProjectionEvaluator(
    const StateSpace *space, std::vector<unsigned int> components)
  : ProjectionEvaluator(space), components_(std::move(components))
{
    checkSpaceType(space_);
}

ompl::base::RealVectorOrthogonalProjectionEvaluator::RealVectorOrthogonalProjectionEvaluator(
    const StateSpacePtr &space, std::vector<unsigned int> components)
  : ProjectionEvaluator(space), components_(std::move(components))
{
    checkSpaceType(space_);
}

void ompl::base::RealVectorOrthogonalProjectionEvaluator::copyBounds()
{
    bounds_.resize(components_.size());
    const RealVectorBounds &bounds = space_->as<RealVectorStateSpace>()->getBounds();
    for (unsigned int i = 0; i < components_.size(); ++i)
    {
        bounds_.low[i] = bounds.low[components_[i]];
        bounds_.high[i] = bounds.high[components_[i]];
    }
}

void ompl::base::RealVectorOrthogonalProjectionEvaluator::defaultCellSizes()
{
    const RealVectorBounds &bounds = space_->as<RealVectorStateSpace>()->getBounds();
    bounds_.resize(components_.size());
    cellSizes_.resize(components_.size());
    for (unsigned int i = 0; i < cellSizes_.size(); ++i)
    {
        bounds_.low[i] = bounds.low[components_[i]];
        bounds_.high[i] = bounds.high[components_[i]];
        cellSizes_[i] = (bounds_.high[i] - bounds_.low[i]) / magic::PROJECTION_DIMENSION_SPLITS;
    }
}

unsigned int ompl::base::RealVectorLinearProjectionEvaluator::getDimension() const
{
    return projection_.mat.size1();
}

void ompl::base::RealVectorLinearProjectionEvaluator::project(const State *state, EuclideanProjection &projection) const
{
    projection_.project(state->as<RealVectorStateSpace::StateType>()->values, projection);
}

unsigned int ompl::base::RealVectorOrthogonalProjectionEvaluator::getDimension() const
{
    return components_.size();
}

void ompl::base::RealVectorOrthogonalProjectionEvaluator::project(const State *state,
                                                                  EuclideanProjection &projection) const
{
    for (unsigned int i = 0; i < components_.size(); ++i)
        projection(i) = state->as<RealVectorStateSpace::StateType>()->values[components_[i]];
}

ompl::base::RealVectorIdentityProjectionEvaluator::RealVectorIdentityProjectionEvaluator(
    const StateSpace *space, const std::vector<double> &cellSizes)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    setCellSizes(cellSizes);
    copyBounds();
}

ompl::base::RealVectorIdentityProjectionEvaluator::RealVectorIdentityProjectionEvaluator(const StateSpace *space)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
}

ompl::base::RealVectorIdentityProjectionEvaluator::RealVectorIdentityProjectionEvaluator(
    const StateSpacePtr &space, const std::vector<double> &cellSizes)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
    setCellSizes(cellSizes);
    copyBounds();
}

ompl::base::RealVectorIdentityProjectionEvaluator::RealVectorIdentityProjectionEvaluator(const StateSpacePtr &space)
  : ProjectionEvaluator(space)
{
    checkSpaceType(space_);
}

void ompl::base::RealVectorIdentityProjectionEvaluator::copyBounds()
{
    bounds_ = space_->as<RealVectorStateSpace>()->getBounds();
}

void ompl::base::RealVectorIdentityProjectionEvaluator::defaultCellSizes()
{
    bounds_ = space_->as<RealVectorStateSpace>()->getBounds();
    cellSizes_.resize(getDimension());
    for (unsigned int i = 0; i < cellSizes_.size(); ++i)
        cellSizes_[i] = (bounds_.high[i] - bounds_.low[i]) / magic::PROJECTION_DIMENSION_SPLITS;
}

void ompl::base::RealVectorIdentityProjectionEvaluator::setup()
{
    copySize_ = getDimension() * sizeof(double);
    ProjectionEvaluator::setup();
}

unsigned int ompl::base::RealVectorIdentityProjectionEvaluator::getDimension() const
{
    return space_->getDimension();
}

void ompl::base::RealVectorIdentityProjectionEvaluator::project(const State *state,
                                                                EuclideanProjection &projection) const
{
    memcpy(&projection(0), state->as<RealVectorStateSpace::StateType>()->values, copySize_);
}
