#include "Game.hpp"

FramerateIndicator::FramerateIndicator(Node* parent) : Sprite(parent)
{
    get_delegate().subscribe(&FramerateIndicator::respond, this);
    hide();
}

void FramerateIndicator::respond(SDL_Event& event)
{
    if (get_delegate().compare(event, "toggle-framerate"))
    {
        toggle_hidden();
    }
}

SDL_Surface* FramerateIndicator::get_surface()
{
    std::string padded = sfw::pad(get_root()->frame_count_this_second, 2);
    SDL_Surface* shaded = TTF_RenderText_Shaded(
        get_root()->bp_mono_font, padded.c_str(), {0, 0, 0, 255}, {255, 255, 255, 255});
    if (!shaded)
    {
        get_root()->print_sdl_error("Could not create text");
    }
    return shaded;
}

void FramerateIndicator::refresh()
{
    if (!is_hidden() && get_root()->bp_mono_font != nullptr)
    {
        unload();
        SDL_Surface* surface = get_surface();
        SDL_Texture* texture = SDL_CreateTextureFromSurface(get_root()->get_renderer(), surface);
        add_frames(texture);
        SDL_FreeSurface(surface);
        set_ne(get_display().window_box().ne());
    }
}

Game::Game()
{
    /* Set the appropriate priority level for the default log category so either info level messages
     * and higher are enabled or debug level messages are enabled, depending on the global configuration */
    SDL_LogPriority default_log_category_priority;
    if (get_configuration()["log"]["debug-to-file"] || get_configuration()["log"]["debug-to-stdout"])
    {
        default_log_category_priority = SDL_LOG_PRIORITY_DEBUG;
    }
    else
    {
        default_log_category_priority = SDL_LOG_PRIORITY_INFO;
    }
    SDL_LogSetPriority(DEFAULT_SDL_LOG_CATEGORY, default_log_category_priority);
    /* set custom log function that prints to stdout/stderr and to file if enabled */
    SDL_LogSetOutputFunction(&Game::sdl_log_override, this);
    /* pretty print config to debug log */
    std::ostringstream log_message;
    log_message << std::setw(4) << get_configuration() << std::endl;
    debug(log_message.str());
    /* tell SDL which render driver you will be requesting when calling SDL_CreateRenderer */
    SDL_SetHint(SDL_HINT_RENDER_DRIVER, get_configuration()["display"]["render driver"].get<std::string>().c_str());
    /* initialize the buffer of frame lengths which will be used to calculate FPS */
    frame_length_history.reserve(5000);
    set_framerate(get_configuration()["display"]["framerate"]);
    delegate.subscribe(&Game::handle_quit_event, this, SDL_QUIT);
    /* Needed for displaying fullscreen correctly on Linux (?) Also might need SDL_VIDEO_CENTERED (?) */
    std::string fullscreen_env_assigment = "SDL_VIDEO_X11_LEGACY_FULLSCREEN=0";
    putenv(const_cast<char*>(fullscreen_env_assigment.c_str()));
    /* log compiled and linked SDL versions */
    SDL_version version;
    log_message = std::ostringstream();
    SDL_VERSION(&version);
    log_message << "compiled against SDL " << static_cast<int>(version.major) << "." << static_cast<int>(version.minor) <<
        "." << static_cast<int>(version.patch) << std::endl;
    SDL_GetVersion(&version);
    log_message << "linked to SDL " << static_cast<int>(version.major) << "." << static_cast<int>(version.minor) << "." <<
        static_cast<int>(version.patch);
    log(log_message.str());
    /* allows use of our own main function (?) see SDL_SetMainReady.html */
    SDL_SetMainReady();
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
    {
        print_sdl_error("SDL could not initialize");
        flag_to_end();
    }
    log_message = std::ostringstream();
    log_message << "GLEW " << glewGetString(GLEW_VERSION);
    log(log_message.str());
    glm::ivec2 window_size = get_configuration()["display"]["dimensions"].get<glm::ivec2>();
    /* Create a window with dimensions set in the config, centered, and flagged to be usable in OpenGL context */
    window = SDL_CreateWindow(
        get_configuration()["display"]["title"].get_ref<const std::string&>().c_str(), SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED, window_size.x, window_size.y, SDL_WINDOW_OPENGL);
    if (window == nullptr)
    {
        print_sdl_error("Could not create window");
        flag_to_end();
    }
    /* Create an SDL renderer for clearing the screen to black and for logging renderer properties. Destroy renderer
     * when finished.
     */
    if ((renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_TARGETTEXTURE | SDL_RENDERER_ACCELERATED)) == nullptr)
    {
        print_sdl_error("Could not create renderer");
        flag_to_end();
    }
    else
    {
        int w, h;
        /* log the renderer resolution */
        SDL_GetRendererOutputSize(renderer, &w, &h);
        log_message = std::ostringstream();
        log_message << "renderer output size is " << w << "x" << h;
        log(log_message.str());
        /* clear screen to black */
        SDL_SetRenderTarget(renderer, nullptr);
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
        SDL_RenderFlush(renderer);
        SDL_DestroyRenderer(renderer);
    }
    SDL_ShowCursor(get_configuration()["display"]["show-cursor"]);
    if (TTF_Init() < 0)
    {
        print_sdl_error("Could not initialize SDL ttf");
        flag_to_end();
    }
    else
    {
        SDL_Log("initialized SDL ttf %d.%d.%d", SDL_TTF_MAJOR_VERSION,
                SDL_TTF_MINOR_VERSION, SDL_TTF_PATCHLEVEL);
    }
    if ((bp_mono_font = TTF_OpenFont("BPmono.ttf", 14)) == nullptr)
    {
        print_error("Could not load BPmono.ttf");
    }
    if (Mix_Init(MIX_INIT_OGG) == 0)
    {
        print_sdl_error("Could not initialize SDL mixer");
        flag_to_end();
    }
    else
    {
        SDL_Log("initialized SDL mixer %d.%d.%d", SDL_MIXER_MAJOR_VERSION,
                SDL_MIXER_MINOR_VERSION, SDL_MIXER_PATCHLEVEL);
    }
    // if (Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT,
    //                   MIX_DEFAULT_CHANNELS, 1024) < 0)
    if (Mix_OpenAudio(11025, AUDIO_U8, MIX_DEFAULT_CHANNELS, 2048) < 0)
    {
        print_sdl_error("Could not set up audio");
    }
    SDL_Log("Using audio driver: %s", SDL_GetCurrentAudioDriver());
    const int audio_device_count = SDL_GetNumAudioDevices(SDL_TRUE);
    for (int ii = 0; ii < audio_device_count; ii++)
    {
        SDL_Log("Found audio capture device %i: %s", ii, SDL_GetAudioDeviceName(ii, SDL_TRUE));
    }
    audio.load_sfx();
    audio.load_bgm();
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    log("big endian");
#else
    log("little endian");
#endif
    last_frame_timestamp = SDL_GetTicks();
}

void Game::load_sdl_context()
{
    if (glcontext != nullptr)
    {
        SDL_GL_DeleteContext(glcontext);
        glcontext = nullptr;
    }
    SDL_RendererInfo renderer_info;
    int render_driver_count = SDL_GetNumRenderDrivers();
    SDL_Log("Render drivers:");
    for (int ii = 0; ii < render_driver_count; ii++)
    {
        SDL_GetRenderDriverInfo(ii, &renderer_info);
        log_renderer_info(renderer_info);
    }
    if ((renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_TARGETTEXTURE | SDL_RENDERER_ACCELERATED)) == nullptr)
    {
        print_sdl_error("Could not create renderer");
        flag_to_end();
    }
    else
    {
        SDL_Log("Current renderer:");
        SDL_GetRendererInfo(renderer, &renderer_info);
        log_renderer_info(renderer_info);
        SDL_Log("Renderer supports the use of render targets? %d", SDL_RenderTargetSupported(renderer));
    }
    is_gl_context = false;
    log_display_mode();
}

void Game::load_gl_context()
{
    if (renderer != nullptr)
    {
        SDL_DestroyRenderer(renderer);
        renderer = nullptr;
    }
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
    if ((glcontext = SDL_GL_CreateContext(window)) == nullptr)
    {
        print_sdl_error("Could not get GL context");
        flag_to_end();
    }
    /* try enabling vsync */
    if (SDL_GL_SetSwapInterval(1) == 0)
    {
        log("enabled vsync");
    }
    else
    {
        log("vsync not supported");
    }
    GLenum error = glewInit();
    std::ostringstream message;
    if (error != GLEW_OK)
    {
        message << "GLEW could not initialize " << glewGetErrorString(error);
        print_error(message.str());
    }
    message << "OpenGL " << glGetString(GL_VERSION) << ", renderer " << glGetString(GL_RENDERER) << ", shading language " <<
        glGetString(GL_SHADING_LANGUAGE_VERSION);
    log(message.str());
    is_gl_context = true;
    log_display_mode();
}

/* Overrides SDL's default log function to log a message to stdout/stderr and, if log is enabled in the
 * global configuration, to a file. Debug level statements may be suppressed, printed to stdout, or printed to
 * both stdout and file, depending on the global configuration.
 */
void Game::sdl_log_override(void* userdata, int category, SDL_LogPriority priority, const char* message)
{
    Game* game = static_cast<Game*>(userdata);
    std::ostream& out = (priority > SDL_LOG_PRIORITY_WARN) ? std::cerr : std::cout;
    // print to stdout/stderr if priority is higher than debug or debug statements are enabled
    if (priority > SDL_LOG_PRIORITY_DEBUG || game->get_configuration()["log"]["debug-to-stdout"])
    {
        out << message << std::endl;
    }
    // handle writing to log file
    if (game->get_configuration()["log"]["enabled"])
    {
        fs::path path = game->get_configuration()["log"]["output-directory"];
        if (!fs::exists(path))
        {
            fs::create_directories(path);
        }
        // prepend a timestamp to the message
        std::time_t now = std::time(nullptr);
        std::stringstream stamped_message;
        stamped_message << std::put_time(std::localtime(&now), "%F %T ") << message;
        // if debug is enabled, append message to debug log file
        if (game->get_configuration()["log"]["debug-to-file"])
        {
            fs::path debug_path = path / game->get_configuration()["log"]["debug-file-name"];
            std::ofstream debug_stream(debug_path, std::ios_base::app);
            debug_stream << stamped_message.str() << std::endl;
        }
        // only append messages to the info log that are higher than debug priority
        if (priority > SDL_LOG_PRIORITY_DEBUG)
        {
            fs::path info_path = path / game->get_configuration()["log"]["info-file-name"];
            std::ofstream info_stream(info_path, std::ios_base::app);
            info_stream << stamped_message.str() << std::endl;
        }
    }
}

void Game::print_error(const std::string& message)
{
    sfw::print_error(message);
}

void Game::print_sdl_error(const std::string& message)
{
    sfw::print_sdl_error(message);
}

void Game::print_frame_length_history()
{
    for (float& frame_length : frame_length_history)
    {
        std::cout << frame_length << ", ";
    }
    std::cout << std::endl;
}

/* Create, compile and return the ID of a GL shader from the GLSL code at path */
GLuint Game::load_shader(const fs::path& path, GLenum type) const
{
    GLuint shader = glCreateShader(type);
    std::fstream file = std::fstream(path);
    std::ostringstream message;
    std::string contents = sfw::file_to_string(path);
    glShaderSource(shader, 1, reinterpret_cast<const GLchar**>(&contents), 0);
    // glShaderSource(shader, 1, const_cast<const GLchar**>(&buf), 0);
    glCompileShader(shader);
    GLint is_compiled;
    glGetShaderiv(shader, GL_COMPILE_STATUS, &is_compiled);
    if (is_compiled == GL_TRUE)
    {
        message << "compiled shader at " << path;
        log(message.str());
        return shader;
    }
    else
    {
        /* log error by allocating a string to copy the GL error message buffer into */
        std::string error_info;
        GLint max_length;
        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &max_length);
        error_info.resize(max_length, 0);
        glGetShaderInfoLog(shader, error_info.size(), nullptr, error_info.data());
        message << "failed to compile " << path << ": " << error_info;
        log(message.str());
        return -1;
    }
}

bool Game::link_shader(GLuint program) const
{
    glLinkProgram(program);
    int is_linked;
    glGetProgramiv(program, GL_LINK_STATUS, (int *) &is_linked);
    std::ostringstream message;
    if (is_linked == GL_TRUE)
    {
        message << "linked shader program " << program;
        log(message.str());
        return true;
    }
    else
    {
        /* log error by allocating a string to copy the GL error message buffer into */
        std::string error_info;
        GLint max_length;
        glGetProgramiv(program, GL_INFO_LOG_LENGTH, &max_length);
        error_info.resize(max_length, 0);
        glGetProgramInfoLog(program, error_info.size(), nullptr, error_info.data());
        message << "failed linking shader program " << program << ": " << error_info;
        log(message.str());
        return false;
    }
}

/* Send an info priority message to SDL's log output function, which is overridden by our own member
 * function. Category will default to SDL's custom category.
 */
void Game::log(const std::string& message, const int category) const
{
    SDL_LogInfo(category, "%s", message.c_str());
}

/* Send a debug priority message to SDL's log output function, which is overridden by our own member
 * function. Category will default to SDL's custom category. Using the default category will ensure
 * that debug level statements are handled according to the options in the global configuration.
 */
void Game::debug(const std::string& message, const int category) const
{
    SDL_LogDebug(category, "%s", message.c_str());
}

void Game::log_renderer_info(SDL_RendererInfo& info)
{
    SDL_Log("renderer name: %s, flags: %i, texture formats: %i, "
            "max texture w: %i, max texture h: %i", info.name, info.flags,
            info.num_texture_formats, info.max_texture_width,
            info.max_texture_height);
}

bool Game::log_gl_errors(std::string suffix)
{
    GLenum error;
    bool error_logged = false;
    while ((error = glGetError()) != GL_NO_ERROR)
    {
        error_logged = true;
        std::ostringstream message;
        if (error == GL_INVALID_ENUM)
        {
            message << "GL_INVALID_ENUM, an unacceptable value is specified for an enumerated argument";
        }
        else if (error == GL_INVALID_VALUE)
        {
            message << "GL_INVALID_VALUE, a numeric argument is out of range";
        }
        else if (error == GL_INVALID_OPERATION)
        {
            message << "GL_INVALID_OPERATION, the specified operation is not allowed in the current state";
        }
        else if (error == GL_INVALID_FRAMEBUFFER_OPERATION)
        {
            message << "GL_INVALID_FRAMEBUFFER_OPERATION, the framebuffer object is not complete";
        }
        else if (error == GL_OUT_OF_MEMORY)
        {
            message << "GL_OUT_OF_MEMORY, there is not enough memory left to execute the command";
        }
        else if (error == GL_STACK_UNDERFLOW)
        {
            message << "GL_STACK_UNDERFLOW, an attempt has been made to perform an operation that would " <<
                "cause an internal stack to underflow";
        }
        else if (error == GL_STACK_OVERFLOW)
        {
            message << "GL_STACK_OVERFLOW, an attempt has been made to perform an operation that would " <<
                "cause an internal stack to overflow";
        }
        if (!suffix.empty())
        {
            message << " " << suffix;
        }
        log(message.str());
    }
    return error_logged;
}

/* Write resolution, monitor refresh rate, and pixel format to the log. Code taken from SDL_GetCurrentDisplayMode.html
 * on the SDL wiki */
void Game::log_display_mode()
{
    SDL_DisplayMode current;
    std::ostringstream message;
    for (int ii = 0; ii < SDL_GetNumVideoDisplays(); ii++)
    {
        int mode = SDL_GetCurrentDisplayMode(ii, &current);
        if (mode != 0)
        {
            message << "Could not get display mode for video display #" << ii << ": " << SDL_GetError();
        }
        else
        {
            message << "Display #" << ii << ": display mode is " << current.w << "x" << current.h << "px @ " <<
                current.refresh_rate << "hz " << get_pixel_format_string(current.format);
        }
        log(message.str());
    }
}

void Game::log_surface_format(SDL_Surface* surface, std::string preface)
{
    SDL_PixelFormat* format = surface->format;
    std::string pixel_format = get_pixel_format_string(format->format);
    SDL_Log("%s bpp: %i mask: %i %i %i %i format: %s", preface.c_str(),
            format->BytesPerPixel, format->Rmask, format->Gmask, format->Bmask,
            format->Amask, pixel_format.c_str());
}

std::string Game::get_pixel_format_string(Uint32 format)
{
    std::string pixel_format;
    if (format == SDL_PIXELFORMAT_UNKNOWN)
    {
        pixel_format = "SDL_PIXELFORMAT_UNKNOWN";
    }
    else if (format == SDL_PIXELFORMAT_INDEX1LSB)
    {
        pixel_format = "SDL_PIXELFORMAT_INDEX1LSB";
    }
    else if (format == SDL_PIXELFORMAT_INDEX1MSB)
    {
        pixel_format = "SDL_PIXELFORMAT_INDEX1MSB";
    }
    else if (format == SDL_PIXELFORMAT_INDEX4LSB)
    {
        pixel_format = "SDL_PIXELFORMAT_INDEX4LSB";
    }
    else if (format == SDL_PIXELFORMAT_INDEX4MSB)
    {
        pixel_format = "SDL_PIXELFORMAT_INDEX4MSB";
    }
    else if (format == SDL_PIXELFORMAT_INDEX8)
    {
        pixel_format = "SDL_PIXELFORMAT_INDEX8";
    }
    else if (format == SDL_PIXELFORMAT_RGB332)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB332";
    }
    else if (format == SDL_PIXELFORMAT_RGB444)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB444";
    }
    else if (format == SDL_PIXELFORMAT_RGB555)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB555";
    }
    else if (format == SDL_PIXELFORMAT_BGR555)
    {
        pixel_format = "SDL_PIXELFORMAT_BGR555";
    }
    else if (format == SDL_PIXELFORMAT_ARGB4444)
    {
        pixel_format = "SDL_PIXELFORMAT_ARGB4444";
    }
    else if (format == SDL_PIXELFORMAT_RGBA4444)
    {
        pixel_format = "SDL_PIXELFORMAT_RGBA4444";
    }
    else if (format == SDL_PIXELFORMAT_ABGR4444)
    {
        pixel_format = "SDL_PIXELFORMAT_ABGR4444";
    }
    else if (format == SDL_PIXELFORMAT_BGRA4444)
    {
        pixel_format = "SDL_PIXELFORMAT_BGRA4444";
    }
    else if (format == SDL_PIXELFORMAT_ARGB1555)
    {
        pixel_format = "SDL_PIXELFORMAT_ARGB1555";
    }
    else if (format == SDL_PIXELFORMAT_RGBA5551)
    {
        pixel_format = "SDL_PIXELFORMAT_RGBA5551";
    }
    else if (format == SDL_PIXELFORMAT_ABGR1555)
    {
        pixel_format = "SDL_PIXELFORMAT_ABGR1555";
    }
    else if (format == SDL_PIXELFORMAT_BGRA5551)
    {
        pixel_format = "SDL_PIXELFORMAT_BGRA5551";
    }
    else if (format == SDL_PIXELFORMAT_RGB565)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB565";
    }
    else if (format == SDL_PIXELFORMAT_BGR565)
    {
        pixel_format = "SDL_PIXELFORMAT_BGR565";
    }
    else if (format == SDL_PIXELFORMAT_RGB24)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB24";
    }
    else if (format == SDL_PIXELFORMAT_BGR24)
    {
        pixel_format = "SDL_PIXELFORMAT_BGR24";
    }
    else if (format == SDL_PIXELFORMAT_RGB888)
    {
        pixel_format = "SDL_PIXELFORMAT_RGB888";
    }
    else if (format == SDL_PIXELFORMAT_RGBX8888)
    {
        pixel_format = "SDL_PIXELFORMAT_RGBX8888";
    }
    else if (format == SDL_PIXELFORMAT_BGR888)
    {
        pixel_format = "SDL_PIXELFORMAT_BGR888";
    }
    else if (format == SDL_PIXELFORMAT_BGRX8888)
    {
        pixel_format = "SDL_PIXELFORMAT_BGRX8888";
    }
    else if (format == SDL_PIXELFORMAT_ARGB8888)
    {
        pixel_format = "SDL_PIXELFORMAT_ARGB8888";
    }
    else if (format == SDL_PIXELFORMAT_RGBA8888)
    {
        pixel_format = "SDL_PIXELFORMAT_RGBA8888";
    }
    else if (format == SDL_PIXELFORMAT_ABGR8888)
    {
        pixel_format = "SDL_PIXELFORMAT_ABGR8888";
    }
    else if (format == SDL_PIXELFORMAT_BGRA8888)
    {
        pixel_format = "SDL_PIXELFORMAT_BGRA8888";
    }
    else if (format == SDL_PIXELFORMAT_ARGB2101010)
    {
        pixel_format = "SDL_PIXELFORMAT_ARGB2101010";
    }
    return pixel_format;
}

const SDL_Window* Game::get_window() const
{
    return window;
}

SDL_Window* Game::get_window()
{
    return window;
}

const SDL_Renderer* Game::get_renderer() const
{
    return renderer;
}

SDL_Renderer* Game::get_renderer()
{
    return renderer;
}

const Input& Game::get_input() const
{
    return input;
}

Input& Game::get_input()
{
    return input;
}

Audio& Game::get_audio()
{
    return audio;
}

/* Applies delta timing to a vector: returns the passed vector as weighted by the amount of time passed since the
 * last frame update, allowing for vector values to change the same amount over time independent of the frame rate */
glm::vec2 Game::weight(glm::vec2 motion)
{
    return {weight(motion.x), weight(motion.y)};
}

void Game::run()
{
    SDL_FlushEvents(SDL_FIRSTEVENT, SDL_LASTEVENT);
    suppress_input_temporarily();
#if defined(__EMSCRIPTEN__)
    SDL_Log("using emscripten main loop");
    emscripten_set_main_loop_arg(&loop, this, -1, true);
#else
    SDL_Log("using standard main loop");
    while (!done)
    {
        frame(SDL_GetTicks());
        SDL_Delay(8);
    }
#endif
}

void Game::frame(float ticks)
{
    // std::cout << "frame_length: " << frame_length << ", ticks: " << ticks << ", last_frame_timestamp: " << last_frame_timestamp <<
    //     ", frame_time_overflow: " << frame_time_overflow;
    if (ticks - last_frame_timestamp + frame_time_overflow >= frame_length)
    // if (ticks - last_frame_timestamp >= frame_length)
    {
        last_frame_length = ticks - last_frame_timestamp;
        if (frame_length_history.size() == 5000)
        {
            frame_length_history.pop_back();
        }
        frame_length_history.insert(frame_length_history.begin(), last_frame_length);
        frame_time_overflow = last_frame_length + frame_time_overflow - frame_length;
        last_frame_timestamp = ticks;
        // std::cout << ", last_frame_length: " << last_frame_length << " [rendering frame]";
        if (last_frame_length < 1000)
        {
            recorder.update();
            delegate.dispatch();
            audio.update();
            input.unsuppress_animation.update();
            update();
            framerate_indicator.update();
            configuration.update();
            if (!is_gl_context)
            {
                SDL_SetRenderTarget(renderer, nullptr);
                SDL_RenderPresent(renderer);
            }
        }
        // if (frame_time_overflow > frame_length)
        // {
        //     // SDL_Log("%i frame(s) dropped", ((int) (frame_time_overflow / frame_length)));
        //     frame_time_overflow = 0;
        // }
        frame_count_this_second++;
        if (ticks - last_frame_count_timestamp >= 1000)
        {
            framerate_indicator.refresh();
            last_frame_count_timestamp = ticks;
            frame_count_this_second = 0;
        }
    }
    // std::cout << std::endl;
}

#if defined(__EMSCRIPTEN__)

void loop(void* context)
{
    Game* game = static_cast<Game*>(context);
    game->frame(emscripten_performance_now());
    if (game->done)
    {
        emscripten_cancel_main_loop();
    }
}    

#endif

void Game::flag_to_end()
{
    done = true;
}

/* Set the length of a frame in seconds by passing the framerate, the amount of frames to display
 * per second */
void Game::set_framerate(int framerate)
{
    if (framerate < 1)
    {
        framerate = 1;
    }
    frame_length = 1000.0 / framerate;
}

/* Return the length of a frame in seconds */
float Game::get_frame_length() const
{
    return frame_length;
}

void Game::handle_quit_event(SDL_Event &event)
{
    if (event.type == SDL_QUIT)
    {
        flag_to_end();
    }
}

void Game::quit()
{
    if (glcontext != NULL)
    {
        SDL_GL_DeleteContext(glcontext);
    }
    if (renderer != NULL)
    {
        SDL_DestroyRenderer(renderer);
    }
    if (window != NULL)
    {
        SDL_DestroyWindow(window);
    }
    if (TTF_WasInit())
    {
        TTF_CloseFont(bp_mono_font);
        TTF_Quit();
    }
    Mix_CloseAudio();
    Mix_Quit();
    SDL_Quit();
}

Game::~Game()
{
    get_delegate().unsubscribe(this);
}