#pragma once
#include <SFML/Window/Event.hpp>
#include <algorithm>
#include <cmath>
namespace fluidsim::port::desktop {
class PlaybackControl {
public:
    bool realtime() const {return realtime_;}
    double target_speed() const {return realtime_?1.0:manual_speed_;}
    bool handle_event(const sf::Event& event,bool shift=false) {
        if(const auto* key=event.getIf<sf::Event::KeyPressed>()) {
            if(key->code==sf::Keyboard::Key::Space){realtime_=!realtime_;return true;}
            if(!realtime_&&key->code==sf::Keyboard::Key::PageUp){adjust(1);return true;}
            if(!realtime_&&key->code==sf::Keyboard::Key::PageDown){adjust(-1);return true;}
        }
        if(const auto* wheel=event.getIf<sf::Event::MouseWheelScrolled>();wheel&&!realtime_&&shift) {adjust(wheel->delta);return true;}
        return false;
    }
private:
    bool realtime_{true};
    double manual_speed_{1};
    void adjust(double steps){manual_speed_=std::clamp(manual_speed_*std::exp(steps*.12),.0001,1.0);}
};
}