/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2024                                                               *
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 * permit persons to whom the Software is furnished to do so, subject to the following   *
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 * or substantial portions of the Software.                                              *
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 ****************************************************************************************/

#ifndef __OPENSPACE_MODULE_MULTIRESVOLUME___LOCALERRORHISTOGRAMMANAGER___H__
#define __OPENSPACE_MODULE_MULTIRESVOLUME___LOCALERRORHISTOGRAMMANAGER___H__

#include <openspace/util/histogram.h>
#include <ghoul/glm.h>
#include <filesystem>
#include <iosfwd>
#include <map>

namespace openspace {

class TSP;

class LocalErrorHistogramManager {
public:
    LocalErrorHistogramManager(TSP* tsp);

    bool buildHistograms(int numBins);
    const Histogram* spatialHistogram(unsigned int brickIndex) const;
    const Histogram* temporalHistogram(unsigned int brickIndex) const;

    bool loadFromFile(const std::filesystem::path& filename);
    bool saveToFile(const std::filesystem::path& filename);

private:
    TSP* _tsp = nullptr;
    std::ifstream* _file;

    std::vector<Histogram> _spatialHistograms;
    std::vector<Histogram> _temporalHistograms;
    unsigned int _numInnerNodes = 0;
    float _minBin = 0.f;
    float _maxBin = 0.f;
    int _numBins = 0;

    std::map<unsigned int, std::vector<float>> _voxelCache;

    bool buildFromOctreeChild(unsigned int bstOffset, unsigned int octreeOffset);
    bool buildFromBstChild(unsigned int bstOffset, unsigned int octreeOffset);

    std::vector<float> readValues(unsigned int brickIndex) const;

    int parentOffset(int offset, int base) const;

    unsigned int brickToInnerNodeIndex(unsigned int brickIndex) const;
    unsigned int innerNodeToBrickIndex(unsigned int innerNodeIndex) const;
    unsigned int linearCoords(glm::vec3 coords) const;
    unsigned int linearCoords(int x, int y, int z) const;
    unsigned int linearCoords(glm::ivec3 coords) const;

    float interpolate(glm::vec3 samplePoint, const std::vector<float>& voxels) const;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_MULTIRESVOLUME___LOCALERRORHISTOGRAMMANAGER___H__