#include <window.hpp>

#include <config.hpp>

#include <SDL2/SDL_image.h>
#include <SDL2/SDL_mixer.h>

constexpr const char* WINDOW_TITLE  = "gamedev";

WindowSystem::WindowSystem(void)
{
    // attempt to initialize SDL
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0) {
        std::cout << "SDL was not able to initialize! Error: " << SDL_GetError();
        abort();
    }
    atexit(SDL_Quit);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);

    // attempt to initialize SDL_image
    if (!(IMG_Init(IMG_INIT_PNG | IMG_INIT_JPG) & (IMG_INIT_PNG | IMG_INIT_JPG))) {
        std::cout << "Could not init image libraries! Error: " << IMG_GetError();
        abort();
    }
    atexit(IMG_Quit);

    // attempt to initialize SDL_mixer
    if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048) < 0) {
        std::cout << "SDL_mixer could not initialize! Error: " << Mix_GetError();
        abort();
    }
    Mix_AllocateChannels(8);
    atexit(Mix_Quit);

    // create the SDL window object
    window = SDL_CreateWindow(WINDOW_TITLE,
                              SDL_WINDOWPOS_UNDEFINED,	// Spawn the window at random (undefined) x and y coordinates
                              SDL_WINDOWPOS_UNDEFINED,	//
                              game::SCREEN_WIDTH,
                              game::SCREEN_HEIGHT,
                              SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL
                              );

    if (window == nullptr) {
        std::cout << "The window failed to generate! SDL_Error: " << SDL_GetError();
        abort();
    }

    // create the OpenGL object that SDL provides
    if ((glContext = SDL_GL_CreateContext(window)) == nullptr) {
        std::cout << "The OpenGL context failed to initialize! SDL_Error: " << SDL_GetError();
        abort();
    }
}

WindowSystem::~WindowSystem(void)
{
    SDL_GL_DeleteContext(glContext);
    SDL_DestroyWindow(window);
}

void WindowSystem::update(entityx::EntityManager &en, entityx::EventManager &ev, entityx::TimeDelta dt)
{
    (void)en;
    (void)ev;
    (void)dt;

    SDL_GL_SwapWindow(window);
}