//
// Window and input event handling
//
#include "camera.h"

typedef enum _InteractionMode {
    MODE_PAN = 0x01,
    MODE_WIDTHLEVEL = 0x02,
    MODE_ZOOM = 0x04,
    MODE_SCROLL = 0x08,
}InteractionMode;


class EventHandler
{
public:
    EventHandler(const char* windowTitle);

    void processEvents();
    Camera& camera() { return mCamera; }
    void swapWindow();

    int GetEventType();

    float GetDeltaX();
    float GetDeltaY();

    SDL_Renderer* GetRenderer();

    void SetInteractionMode(int mode);

    void SetMouseButtonDownPosition(int x, int y);
    void SetMouseButtonUpPosition(int x, int y);


public:
    float m_fDeltaX;
    float m_fDeltaY;
    int m_nEventType;
    int m_InteractionMode;
    // Camera
    Camera mCamera;

    SDL_Renderer* m_pRenderer;
    // Window
    SDL_Window* mpWindow;
    Uint32 mWindowID;
    void windowResizeEvent(int width, int height);
    void initWindow(const char* title);

    // Mouse input
    const float cMouseWheelZoomDelta;
    bool mMouseButtonDown;
    int mMouseButtonDownX, mMouseButtonDownY;
    int mMousePositionX, mMousePositionY;

    // Finger input
    bool mFingerDown;
    float mFingerDownX, mFingerDownY;
    long long mFingerDownId;

    // Pinch input
    const float cPinchZoomThreshold, cPinchScale;
    bool mPinch;

    void zoom(float fDelta);

    // Events
    void zoomEventMouse(bool mouseWheelDown, int x, int y);
    void zoomEventPinch (float pinchDist, float pinchX, float pinchY);
    void panEventMouse(int x, int y);
    void panEventFinger(float x, float y);
};

inline EventHandler::EventHandler(const char* windowTitle)
    // Window
    : mpWindow (nullptr)
    , mWindowID (0)
 
    // Mouse input
    , cMouseWheelZoomDelta (0.05f)
    , mMouseButtonDown (false)
    , mMouseButtonDownX (0), mMouseButtonDownY (0)
    , mMousePositionX (0), mMousePositionY (0)

    // Finger input
    , mFingerDown (false)
    , mFingerDownX (0.0f), mFingerDownY (0.0f)
    , mFingerDownId (0)

    // Pinch input
    , cPinchZoomThreshold (0.001f)
    , cPinchScale (8.0f)
    , mPinch (false)
{
    initWindow(windowTitle);
}