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/**
* Copyright (c) 2015~2017 chai
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MIT license. See LICENSE for details.
*/

#ifndef _WOG_H
#define _WOG_H
#include <Windows.h> // for virtual key value

#define WOG_GL   1
#define WOG_GDI  2

#define WOG_API  WOG_GDI

typedef unsigned int uint32; 
typedef unsigned short uint16; 

enum // event type 
{
    WOG_EUNKNOWN = 0,     // unknown event  

    WOG_EKEYDOWN,         // key pressed 
    WOG_EKEYUP,           // key released 

    WOG_EMOUSEMOTION,     // mouse motion 
    WOG_EMOUSEWHEEL,      // mouse wheel scrolling
    WOG_EMOUSEBUTTONDOWN, // mosue button down 
    WOG_EMOUSEBUTTONUP,   // mosue button down 

    WOG_ECLOSE,           // close window
};

enum // mouse button event, e.button value
{
    WOG_MOUSE_LBUTTON, // left mouse button 
    WOG_MOUSE_RBUTTON, // right mouse button 
    WOG_MOUSE_MIDDLE,  // middle button 
};

typedef struct wog_Event
{
    int type; 
    //union             // event value 
    //{
        int key;      // for key, simply use windows virtual key value 
                      // see https://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx
        struct        // for mouse motion
        {
            int x, y; // mouse position 
        }pos;
        int wheel;    // 1 indicate scroll up and -1 indicate scrool down
        int button;   // mouse button 
    //};
}wog_Event;

typedef struct {
	int width, height, channels;
	unsigned char* buffer;
} wog_Surface;

/**
* Entry of user program which defined in user project. You need provide 
* this function's defination. 
*/
#define main wog_main
extern int wog_main(int argc, char* argv[]);

typedef struct wog_Window wog_Window;

#if WOG_API == WOG_GL
/**
* Struct that hold opengl context generated by wglCreateContext() which 
* defined in opengl32.lib 
*/
typedef struct wog_GLContext wog_GLContext;
#endif

enum // window style flag
{
    WOG_HIDDEN     = 4, 
    WOG_RESIZABLE  = 8,
    WOG_DISABLE    = 16, 
};

/**
* Create window with given configures. 
* flag would be:
*     WOG_HIDDEN
*     WOG_RESIZABLE
*     WOG_DISABLE
* or just 0;  
*/
wog_Window* wog_createWindow(const char* title, int width, int height, int x, int y, uint32 flags); 

#if WOG_API == WOG_GL
wog_GLContext* wog_createGLContext(wog_Window* wnd);

int wog_makeCurrent(wog_Window* wnd, wog_GLContext* cxt);

void wog_destroyGLContext(wog_GLContext* cxt);
#endif

void wog_destroyWindow(wog_Window* wnd);

#if WOG_API == WOG_GL
void wog_swapBuffers(wog_Window* wnd); 
#endif

#if WOG_API == WOG_GDI 
void wog_updateSurface(wog_Window* wnd);
#endif

int wog_pollEvent(wog_Window* wnd, wog_Event* e);

void wog_getMouse(wog_Window* wnd, int *x, int *y);

// get current ticks
int wog_tick(); 

void wog_sleep(int ms);

void wog_getwindowsize(wog_Window* wnd, int* width, int* height); 

void wog_show(wog_Window* wnd);

void wog_hide(wog_Window* wnd);

typedef void(*wog_Callback)(wog_Window* wnd) ;

/**
* Register callback functions. 
*/
void wog_registerResizeCallback(wog_Callback cal);
void wog_registerQuitCallback(wog_Callback cal);

wog_Surface* wog_getsurface(wog_Window* wnd);

#endif