/*
SDL requires the following linker entries:
mingw32 (if you're using GCC or G++)
sdl
sdlmain

Don't forget to add your SDL directory to the compiler's include search paths.
*/

#include <iostream>
#include <cmath>
using namespace std;

#include "SDL.h"

// My framerate controls
#define DESIREDFPS 20
#define WAITTIME int(1000.0 / DESIREDFPS)

SDL_Surface* screen;

// Mouse coords
int mx = 0, my = 0;

// My own mouse handling functions
#ifndef _MouseAt
#define _MouseAt
inline bool mouseAt(int x1, int y1, int x2, int y2)
{
    // Designed to execute quickly.  Doesn't check for overlapping boundaries.
    return (mx >= x1) && (mx <= x2) && (my >= y1) && (my <= y2);
}
inline bool mouseAt(SDL_Rect rect)
{
    // Designed to execute quickly.  Doesn't check for overlapping boundaries.
    return (mx >= rect.x) && (mx <= rect.x + rect.w) && (my >= rect.y) && (my <= rect.y + rect.h);
}
#endif

bool initSDL(int w, int h, bool fullscreen)
{
	if( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
        printf("Couldn't initialize SDL: %s\n", SDL_GetError());
        return 0;
    }

    atexit(SDL_Quit);

    screen = SDL_SetVideoMode(w, h, 32, SDL_SWSURFACE | (fullscreen? SDL_FULLSCREEN : 0));

    if ( screen == NULL ) {
        printf("Couldn't set video mode %dx%d: %s\n", w, h, SDL_GetError());
		return 0;
    }
    //printf(" running @ %dx%d %dbpp (done)\n", w,h,screen->format->BitsPerPixel);
	return 1;
} //end bool initSDL(int w, int h, bool fullscreen)

void drawIMG(SDL_Surface* img, int x, int y)
{
    SDL_Rect r;
    r.x = x;
    r.y = y;
    SDL_BlitSurface(img, NULL, screen, &r);
}

void startGame()
{
    // Load a background pic
    //SDL_Surface* back = SDL_LoadBMP("bg.bmp");
    
    // Set up main loop
    SDL_Event event;
    int frameStartTime;
    int frameTime;
    float fps;
    bool done = 0;
    while (!done)
    {
        frameStartTime = SDL_GetTicks();
        // Get mouse coords
        SDL_GetMouseState(&mx, &my);
        // Handle all events
        while (SDL_PollEvent(&event))
        {
            // Handle a closing window
            if(event.type == SDL_QUIT)
            {
                exit(0);
            } //quit
            if(event.type == SDL_KEYDOWN)
            {
                // Do something with single keypresses
                if(event.key.keysym.sym == SDLK_ESCAPE)
                {
                    done = 1;
                }
            }
            if(event.type == SDL_MOUSEBUTTONDOWN)
            {
                // Do something with the mouse
                //if(mouseAt(0,0, 50, 50))
                //    return;
            }
        }
        
        
        
        // Draw background pic to the screen surface
        //SDL_BlitSurface(back, NULL, screen, NULL);
        // or just clear the screen
        SDL_FillRect(screen, NULL, 0x000000);
        
        // Send everything to the monitor (waits for VSYNC)
        SDL_Flip(screen);
        
        
        // Frame control
        frameTime = SDL_GetTicks()-frameStartTime;


        if (frameTime < WAITTIME)
            SDL_Delay(WAITTIME - frameTime);
        frameTime = SDL_GetTicks()-frameStartTime;
        if (frameTime != 0)
            fps = 1000.0f / frameTime;		//this is the framerate with vsync and the framebreak (should be equal to 1000/WAITTIME)
        else
            fps = 1111.11f;
        // End Frame Control
    }
    
    return;
}



// SDL requires main to be declared this way
int main(int argc, char *argv[])
{
    SDL_putenv("SDL_VIDEO_CENTERED=center");
    initSDL(800, 600, 0);
    
    
    SDL_WM_SetCaption("Sample SDL", NULL);
    //SDL_WM_SetIcon(SDL_LoadBMP("icon.bmp"), NULL);
    
    // Seed the random number generator
    srand(time(NULL));
    
    // Now do whatever we want!
    startGame();
    return 0;
}