#include <SDL.h>
#include <stdio.h>
#include <string>

const int SCREEN_HEIGHT = 768;
const int SCREEN_WIDTH = 1024;

bool init();
bool loadMedia();
void close();

SDL_Surface* loadSurface(std::string path);

SDL_Surface* gScreenSurface = NULL;
SDL_Surface* gStretchedSurface = NULL;
SDL_Window* gWindow = NULL;

int main(int argc, char* args[])
{
	if (!init())
	{
		printf("SDL couldn't initialize");
	}
	else
	{
		if (!loadMedia())
		{
			printf("couldn't load media");
		}
		else
		{
			bool quit = false;
			SDL_Event e;
			while (!quit)
			{
				while (SDL_PollEvent(&e) != 0)
				{
					if (e.type == SDL_QUIT)
					{
						quit = true;
					}
				}

				//apply stretched image
				SDL_Rect stretchRect;
				stretchRect.x = 0;
				stretchRect.y = 0;
				stretchRect.w = SCREEN_WIDTH;
				stretchRect.h = SCREEN_HEIGHT;
				SDL_BlitScaled(gStretchedSurface, NULL, gScreenSurface, &stretchRect);
				SDL_UpdateWindowSurface(gWindow);
			}
		}
	}

	close();
	return 0;
}
bool init()
{
	bool success = true;
	if (SDL_Init(SDL_INIT_VIDEO) < 0)
	{
		printf("SDL Couldn't initialize.");
		success = false;
	}
	else
	{
		gWindow = SDL_CreateWindow("Game", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
		if (gWindow == NULL)
		{
			printf("SDL Window failure.");
			success = false;
		}
		else
		{
			gScreenSurface = SDL_GetWindowSurface(gWindow);
			//SDL_Delay(100000);
		}
	}
	return success;
}
bool loadMedia()
{
	bool success = true;
	gStretchedSurface = loadSurface("stretch.bmp");
	if (gStretchedSurface == NULL)
	{
		printf("Couldnt load screen surface");
		success = false;
	}

	return success;
}
SDL_Surface* loadSurface(std::string path)
{
	//final optimized Image
	SDL_Surface* optimizedSurface = NULL;
	//load image at specified path
	SDL_Surface* loadedSurface = SDL_LoadBMP(path.c_str());
	if (loadedSurface == NULL)
	{
		printf("Unable to load image %s! SDL Error: %s\n", path.c_str(), SDL_GetError());
	}
	else
	{
		//convert surface to screen format
		optimizedSurface = SDL_ConvertSurface(loadedSurface, gScreenSurface->format, NULL);
		if (optimizedSurface == NULL)
		{
			printf("Unable to optimize image %s! SDL error: ", path.c_str(), SDL_GetError());
		}
		//get rid of old loaded surface
		SDL_FreeSurface(loadedSurface);
	}
	return optimizedSurface;
}
void close()
{
	SDL_FreeSurface(gStretchedSurface);
	gStretchedSurface = nullptr;
	SDL_DestroyWindow(gWindow);
	gWindow = nullptr;
	SDL_Quit();
}