#include <GL/glew.h>
#include <cmath>
#include <iostream>

class PerformanceAnalyser {
  private:
    double lastFrameTime = 0;
    int frameCount = 0;
    double timeAcc = 0;
    double lastFps = 0;

  public:
    PerformanceAnalyser(int framesToAcc = 10, bool autoPrint = true)
        : framesToAcc(framesToAcc), autoPrint(autoPrint) {};

    int framesToAcc;
    bool autoPrint;

    int getFPS() { return lastFps; }

    void update(float time) {

        timeAcc += (time - lastFrameTime);
        lastFrameTime = time;
        frameCount++;

        if (frameCount == framesToAcc) {

            lastFps = double(framesToAcc) / timeAcc;

            if (autoPrint) {
                std::cout << "Fps: " << std::round(lastFps * 10.0) * 0.1 << "\n"
                          << std::flush;
            }

            frameCount = 0;
            timeAcc = 0;
        }
    }
};