#include "SDL/SDL.h"
#include <string>
#include <iostream>

//Attributes
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

//Surfaces
SDL_Surface* message = NULL;
SDL_Surface* background = NULL;
SDL_Surface* screen = NULL;

SDL_Surface* load_image(std::string filename)
// Оптимизированная загрузка изображения.
{
	SDL_Surface* loadedImage = NULL;
	SDL_Surface* optimizedImage = NULL;

	loadedImage = SDL_LoadBMP(filename.c_str());

	if (loadedImage != NULL)
	{
		optimizedImage = SDL_DisplayFormat(loadedImage);
		SDL_FreeSurface(loadedImage);
	}
	else
	{
		std::cout << "[W]: Ошибка загрузки " << filename.c_str() <<std::endl;
	}

	return optimizedImage;
}

void apply_surface(int x, int y, SDL_Surface* source, SDL_Surface* destination)
{
	SDL_Rect offset;

	offset.x = x;
	offset.y = y;

	SDL_BlitSurface(source, NULL, destination, &offset);
}

int main(int argc, char** args)
{
	if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
	{
		std::cout << "[!]: Ошибка инициализации SDL" << std::endl;
		return 1;
	}

	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);
	if (screen == NULL)
	{
		std::cout << "[!]: Ошибка инициализации экрана" << std::endl;
		return 1;
	}

	SDL_WM_SetCaption("Hello World!", NULL);

	message = load_image("message.bmp");
	background = load_image("background.bmp");

	apply_surface(0, 0, background, screen);
	apply_surface(320, 0, background, screen);
	apply_surface(0, 240, background, screen);
	apply_surface(320, 240, background, screen);

	apply_surface(180, 140, message, screen);

	if (SDL_Flip(screen) == -1)
	{
		std::cout << "[!]: Ошибка функции Flip" << std::endl;
		return 1;
	}

	SDL_Delay(3000);

	SDL_FreeSurface(message);
	SDL_FreeSurface(background);

	SDL_Quit();

	return 0;
}