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

// #global constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

// #Prototyps
// Starts up SDL and creates window
bool init(SDL_Window* pPassedWindow, SDL_Surface* pPassedScreenSurface);

// Loads media
bool loadMedia(SDL_Surface* pPassedHelloWorld);

// Frees media and shuts down SDL
void close(SDL_Window* pPassedWindow, SDL_Surface* pPassedHelloWorld);

int main(int argc, char* args[])
{
    // The window we will be rendering to
    SDL_Window* pWindow = NULL;

    // The surface contained by the window
    SDL_Surface* pScreenSurface = NULL;

    // The image we will load and show on the screen
    SDL_Surface* pHelloWorld = NULL;

    // Start up SDL and create window
    if(!init(pWindow, pScreenSurface))
    {
        printf("Failed to initialize\n");
    }
    else
    {
        // Load media
        if(!loadMedia(pHelloWorld))
        {
            printf("Failed to load media\n");
        }
        else
        {
            // Apply the image
            SDL_BlitSurface(pHelloWorld, NULL, pScreenSurface, NULL); // SDL_BlitSurface sta,ps a copy of a source surface onto the destination surface

            // Update the surface
            SDL_UpdateWindowSurface(pWindow);

            // Wait two seconds
            SDL_Delay(2000);
        }
    }

    // Free resources and close SDL
    close(pWindow, pHelloWorld);

    return 0;
}



bool init(SDL_Window* pPassedWindow, SDL_Surface* pPassedScreenSurface)
{
    // Initialization flag
    bool success = true;

    // Initialize SDL
    if(SDL_Init(SDL_INIT_VIDEO) < -1)
    {
        printf("SDL could not initialize - SDL_Error: &s\n", SDL_GetError());
        success = false;
    }
    else
    {
        // Create window
        pPassedWindow = SDL_CreateWindow("SDL_Tutorial02", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
        if(pPassedWindow == 0)
        {
            printf("Window could not be created - SDL_Error: &s\n", SDL_GetError());
            success = false;
        }
        else
        {
            // Get window surface
            pPassedScreenSurface = SDL_GetWindowSurface(pPassedWindow); // SDL_GetWindowSurface grab the surface contained by the window
        }
    }
    return success;
}

bool loadMedia(SDL_Surface* pPassedHelloWorld)
{
    // Loading success flag
    bool success = true;

    // Load image
    pPassedHelloWorld = SDL_LoadBMP("hello_world.bmp");
    if(pPassedHelloWorld == NULL)
    {
        printf("Unable to load image &s - SDL_Error: &s\n", "hello_world.bmp", SDL_GetError()); 
        success = false;
    }
    return success;
}

void close(SDL_Window* pPassedWindow, SDL_Surface* pPassedHelloWorld)
{
    // Deallocate surface
    SDL_FreeSurface(pPassedHelloWorld);
    pPassedHelloWorld = NULL;

    // Destroy window
    SDL_DestroyWindow(pPassedWindow);
    pPassedWindow = NULL;

    // Quit SDL subsystems
    SDL_Quit();
}