// SDL_HelloWorld.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <SDL.h>

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

//The window to render to
SDL_Window* gWindow = nullptr;

//The surface contained by the window
SDL_Surface* gScreenSurface = nullptr;

//The image to load and show on screen
SDL_Surface* gHelloWorld = nullptr;

int main(int argc, char *argv[])
{

    if (!init())
    {
        std::cerr << "Failed to initialize.\n";
    }
    else
    {
        //Load media
        if (!loadMedia())
        {
            std::cerr << "Failed to load media.\n";
        }
        else
        {
            SDL_BlitSurface(
                gHelloWorld,
                NULL,
                gScreenSurface,
                NULL
            );

            // Update the surface
            SDL_UpdateWindowSurface( gWindow );

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

    //Free resources and close SDL
    close();

    return 0;
}

bool init()
{
    bool success = true;

    // Initialize SDL
    if ( SDL_Init(SDL_INIT_VIDEO) < 0 )
    {
        std::cerr << "Could not initialize SDL. SDL Error: " << SDL_GetError() << "\n";
        success = false;
    }
    else
    {
        gWindow = SDL_CreateWindow(
            "SDL Tutorial",
            SDL_WINDOWPOS_UNDEFINED,
            SDL_WINDOWPOS_UNDEFINED,
            640,
            480,
            SDL_WINDOW_SHOWN
        );
        if (gWindow == NULL)
        {
            std::cerr << "Window could not be created. SDL Error: " << SDL_GetError() << "\n";
            success = false;
        }
        else
        {
            //Get window surface
            gScreenSurface = SDL_GetWindowSurface(gWindow);
        }
    }

    return success;
}

bool loadMedia()
{
    //Load success flag
    bool success = true;

    //Load splash image
    gHelloWorld = SDL_LoadBMP( "./res/imageToLoad.bmp" );
    if (gHelloWorld == NULL)
    {
        std::cerr << "unable to load image ./res/imageToLoad.bmp: " << SDL_GetError() << "\n";
        success = false;
    }

    return success;
}

void close()
{
    //deallocate surface
    SDL_FreeSurface( gHelloWorld );
    gHelloWorld = nullptr;

    //Destroy Window
    SDL_DestroyWindow( gWindow );
    gWindow = nullptr;

    //Quit SDL
    SDL_Quit();
}