#pragma once

#include "tools/music.h"
#include "tools/beatutils.h"
#include <memory>

class BPMCalculator
{
public:
    explicit BPMCalculator();

    void start();
    void stop();
    void click(const microsec& offset);

    bool calculating() const;

    const beat_utils::BeatInfo& fetchApproximatedInfo();
    microsec fetchTimeUntilNextBeat(const microsec& offset);

    microsec getStartingOffset() const;
    void setStartingOffset(microsec offset);
    void moveStartingOffsetBy(microsec shift);

private:
    bool _need_recalculate;
    bool _calculating;

    std::vector<microsec> _deltas;
    microsec _previous_click_offset;
    microsec _first_click_offset;

    beat_utils::BeatInfo _approximated_info;

    inline void reset();
};