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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2024                                                               *
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#ifndef __OPENSPACE_MODULE_BASE___RENDERABLETRAILTRAJECTORY___H__
#define __OPENSPACE_MODULE_BASE___RENDERABLETRAILTRAJECTORY___H__

#include <modules/base/rendering/renderabletrail.h>

#include <openspace/properties/stringproperty.h>
#include <openspace/properties/scalar/boolproperty.h>
#include <openspace/properties/scalar/doubleproperty.h>
#include <openspace/properties/scalar/intproperty.h>
#include <array>

namespace openspace {

namespace documentation { struct Documentation; }

/**
 * This concrete implementation of a RenderableTrail renders a fixed trail, regardless of
 * its shape. The trail is sampled equitemporal (with an interval of _sampleInterval in
 * seconds) between the _startTime and the _endTime. No further update is needed until any
 * of these three values is changed. If _renderFullTrail is true, the entirety of the
 * trail is rendered, regardless of the simulation time. If it is false, the trail is only
 * rendered from the past to the current simulation time, not showing any part of the
 * trail in the future. If _renderFullTrail is false, the current position of the object
 * has to be updated constantly to make the trail connect to the object that has the
 * trail.
 */
class RenderableTrailTrajectory : public RenderableTrail {
public:
    explicit RenderableTrailTrajectory(const ghoul::Dictionary& dictionary);

    void initializeGL() override;
    void deinitializeGL() override;

    void update(const UpdateData& data) override;

    static documentation::Documentation Documentation();

private:

    /**
     * Reset some variables to default state.
     */
    void reset();

    /// The number of vertices that we calculate during each frame of the full sweep pass
    properties::IntProperty _sweepChunkSize;
    /// Enables or disables iterative vertex calculations during a full sweep
    properties::BoolProperty _enableSweepChunking;

    /// The start time of the trail
    properties::StringProperty _startTime;
    /// The end time of the trail
    properties::StringProperty _endTime;
    /// The interval (in seconds) between sample points
    properties::DoubleProperty _sampleInterval;
    /// The factor that determines the time stamp subsampling, using different sized
    /// points along the trajectory
    properties::IntProperty _timeStampSubsamplingFactor;
    /// Determines whether the full trail should be rendered or the future trail removed
    properties::BoolProperty _renderFullTrail;
    /// Determines how many vertices around the object that will be
    /// replaced during full trail rendering
    properties::IntProperty _numberOfReplacementPoints;

    /// Dirty flag that determines whether the full vertex buffer needs to be resampled
    bool _needsFullSweep = true;

    /// Dirty flag to determine whether the stride information needs to be changed
    bool _subsamplingIsDirty = true;

    /// The conversion of the _startTime into the internal time format
    double _start = 0.0;
    /// The conversion of the _endTime into the internal time format
    double _end = 0.0;

    /// Tracks sweep iteration, is used to calculate which vertices to work on per frame
    int _sweepIteration = 0;

    /// How many points do we need to compute given the distance between the
    /// start and end date and the desired sample interval
    unsigned int _numberOfVertices = 0;

    double _totalSampleInterval = 0.0;

    /// Max and min vertex used to calculate the bounding sphere
    glm::dvec3 _maxVertex;
    glm::dvec3 _minVertex;

    /// Contains all timestamps corresponding to the positions in _vertexArray
    std::vector<double> _timeVector;

    /// Keeps track of all double precision vertices of trails
    std::vector<TrailVBOLayout<double>> _dVertexArray;

    /// Contains all the points that we will render in model-space
    std::vector<TrailVBOLayout<float>> _replacementPoints;
};

} // namespace openspace

#endif // __OPENSPACE_MODULE_BASE___RENDERABLETRAILTRAJECTORY___H__