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* Copyright (c) 2014, Hobu Inc. (hobu@hobu.co)
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#pragma once

#include <pdal/Filter.hpp>
#include <pdal/util/ProgramArgs.hpp>

namespace pdal
{

enum class SortOrder
{
    ASC, // ascending
    DESC // descending
};

std::istream& operator >> (std::istream& in, SortOrder& order);
std::ostream& operator << (std::ostream& in, const SortOrder& order);

enum class SortAlgorithm
{
    Normal,
    Stable
};

std::istream& operator >> (std::istream& in, SortAlgorithm& order);
std::ostream& operator << (std::ostream& in, const SortAlgorithm& order);


class PDAL_DLL SortFilter : public Filter
{
public:
    SortFilter()
    {}

    std::string getName() const;

private:

    StringList m_dimNames;
    Dimension::IdList m_dims;
    Dimension::Id* m_activeDim;

    // Sort order.
    SortOrder m_order;
    SortAlgorithm m_algorithm;

    virtual void addArgs(ProgramArgs& args);
    virtual void prepared(PointTableRef table);
    virtual void filter(PointView& view);

    SortFilter& operator=(const SortFilter&) = delete;
    SortFilter(const SortFilter&) = delete;
};

} // namespace pdal
