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

int main(int argc, char* args[])
{
    SDL_Window* window = NULL;

    SDL_Surface* background_surface = NULL;
    SDL_Texture* background_texture = NULL;

    SDL_Surface* button_surface = NULL;
    SDL_Texture* button_texture = NULL;

    SDL_Surface* image_3 = NULL;
    SDL_Texture* image_3_texture = NULL;

    // need a renderer when using textures
    SDL_Renderer* renderer = NULL;

    if (SDL_Init(SDL_INIT_VIDEO) < 0)
    {
        printf("SDL did not init: %s\n", SDL_GetError());
        return 1;
    }

    window = SDL_CreateWindow("SDL example", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    if (window == NULL)
    {
        printf("Window could not be opened: %s\n", SDL_GetError());
        return 1;
    }

    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
    if (renderer == NULL)
    {
        printf("Failed to create renderer: %s\n", SDL_GetError());
        return 1;
    }

    background_surface = SDL_LoadBMP("./background.bmp");
    background_texture = SDL_CreateTextureFromSurface(renderer, background_surface);
    SDL_FreeSurface(background_surface);
    background_surface = NULL;

    SDL_Rect background_texture_rect;
    background_texture_rect.x = 0;
    background_texture_rect.y = 0;
    background_texture_rect.w = 800;
    background_texture_rect.h = 600;

    button_surface = SDL_LoadBMP("./button.bmp");
    button_texture = SDL_CreateTextureFromSurface(renderer, button_surface);
    SDL_FreeSurface(button_surface);
    button_surface = NULL;

    SDL_Rect button_texture_rect;
    button_texture_rect.x = 0;
    button_texture_rect.y = 0;
    button_texture_rect.w = 200;
    button_texture_rect.h = 100;

    image_3 = SDL_LoadBMP("./image3.bmp");
    image_3_texture = SDL_CreateTextureFromSurface(renderer, image_3);
    SDL_FreeSurface(image_3);
    image_3 = NULL;

    SDL_Rect image_3_texture_rect;
    image_3_texture_rect.x = 200;
    image_3_texture_rect.y = 200;
    image_3_texture_rect.w = 188;
    image_3_texture_rect.h = 155;

    int running = 1;
    while (running)
    {
        SDL_Event sevent;
        while (SDL_PollEvent(&sevent))
        {
            switch (sevent.type)
            {
            case SDL_KEYDOWN:
            {
                if (sevent.key.keysym.sym == SDLK_ESCAPE)
                    running = 0;
                break;
            }
            case SDL_QUIT:
            {
                running = 0;
                break;
            }
            }
        }

        SDL_RenderClear(renderer);

        SDL_RenderCopy(renderer, background_texture, NULL, &background_texture_rect);
        SDL_RenderCopy(renderer, button_texture, NULL, &button_texture_rect);
        SDL_RenderCopy(renderer, image_3_texture, NULL, &image_3_texture_rect);

        SDL_RenderPresent(renderer);

        // dont make loops for games/apps like this there are better ways: http://gafferongames.com/game-physics/fix-your-timestep/
        SDL_Delay(17);
    }

    // clean up
    SDL_DestroyTexture(background_texture);
    background_texture = NULL;

    SDL_DestroyTexture(button_texture);
    button_texture = NULL;

    SDL_DestroyTexture(image_3_texture);
    image_3_texture = NULL;

    SDL_DestroyRenderer(renderer);
    renderer = NULL;

    SDL_DestroyWindow(window);
    window = NULL;

    SDL_Quit();

    return 0;
}