#pragma once
#include <SDL3/SDL.h>
#include <list>
#include "Pointer.h"
#include "PointerStream.h"
#include <unordered_map>
#include <memory>
#include "../AppLayers/AppLayer.h"


// Helper class for pointer and gesture control
class InputHandler {
private:
    std::unordered_map<unsigned int, std::shared_ptr<PointerStream>> streams;
    std::unordered_map<unsigned int, float> pressure;
    std::list<std::weak_ptr<AppLayer>> onDownCallbacks;

    void routePointerEvent(PointerEvent event);
    void routeScrollEvent(SDL_MouseWheelEvent e);
    static void setPointerPosition(PointerEvent& event, float windowX, float windowY);

    void onMouseButtonEvent(SDL_MouseButtonEvent e);
    void onMouseMotionEvent(SDL_MouseMotionEvent e);
    void onPenAxisEvent(SDL_PenAxisEvent e);
    void onPenMotionEvent(SDL_PenMotionEvent e);
    void onPenTouchEvent(SDL_PenTouchEvent e);
    void onScroll(SDL_Event e);

    void onMouse(SDL_Event e);
    void onStylus(SDL_Event e);

    void onKeyboard(SDL_Event e);
public:
    static std::list<SDL_Keycode> KeysHeld;
    static std::list<SDL_Keycode> KeysDown;
    static double CursorX, CursorY;
    static double CursorScaledX, CursorScaledY;
    static bool IsKeyHeld(SDL_Keycode key);
    static bool IsKeyDown(SDL_Keycode key);

    // INPUTS
    bool OnSDLEvent(SDL_Event e);

    // OUPUTS
    // When InputHandler recieves an SDL Event equivalent to PointerDirection::Down, registered functions will be called with the PointerStream, and can be accepted by returning true
    void RegisterOnDown(std::weak_ptr<AppLayer> callback) { onDownCallbacks.push_back(callback); }
};