/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2025                                                               *
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 * or substantial portions of the Software.                                              *
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#ifndef __OPENSPACE_MODULE_MULTIRESVOLUME___ERRORHISTOGRAMMANAGER___H__
#define __OPENSPACE_MODULE_MULTIRESVOLUME___ERRORHISTOGRAMMANAGER___H__

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

namespace openspace {

class TSP;

class ErrorHistogramManager {
public:
    explicit ErrorHistogramManager(TSP* tsp);
    ~ErrorHistogramManager() = default;

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

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

private:
    bool buildFromLeaf(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(const glm::vec3& coords) const;
    unsigned int linearCoords(int x, int y, int z) const;
    unsigned int linearCoords(const glm::ivec3& coords) const;

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

    TSP* _tsp;
    std::ifstream* _file;

    std::vector<Histogram> _histograms;
    unsigned int _numInnerNodes;
    float _minBin;
    float _maxBin;
    int _numBins;

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

} // namespace openspace

#endif // __OPENSPACE_MODULE_MULTIRESVOLUME___ERRORHISTOGRAMMANAGER___H__