using System;

using sharpallegro5;

using ALLEGRO_DISPLAY = System.IntPtr;
using ALLEGRO_FONT = System.IntPtr;
using ALLEGRO_EVENT_QUEUE = System.IntPtr;

public class ex_disable_screensaver : AllegroExample
{
    static int Main(string[] argv)
    {
        ALLEGRO_DISPLAY display;
        ALLEGRO_FONT font;
        ALLEGRO_EVENT_QUEUE events;
        ALLEGRO_EVENT @event = new ALLEGRO_EVENT();
        bool done = false;
        bool active = true;
        bool fullscreen = false;

        if (argv.Length == 2)
        {
            if (argv[1] == "-fullscreen")
            {
                fullscreen = true;
            }
        }

        if (!al_init())
        {
            abort_example("Could not init Allegro.\n");
            return 1;
        }

        al_install_keyboard();
        al_init_image_addon();
        al_init_font_addon();

        al_set_new_display_flags(ALLEGRO_GENERATE_EXPOSE_EVENTS |
           (fullscreen ? ALLEGRO_FULLSCREEN : 0));

        display = al_create_display(640, 480);
        if (display == IntPtr.Zero)
        {
            abort_example("Could not create display.\n");
            return 1;
        }

        font = al_load_font("data/font.tga", 0, 0);
        if (font == IntPtr.Zero)
        {
            abort_example("Error loading font\n");
            return 1;
        }

        events = al_create_event_queue();
        al_register_event_source(events, al_get_keyboard_event_source());
        /* For expose events */
        al_register_event_source(events, al_get_display_event_source(display));

        do
        {
            al_clear_to_color(al_map_rgb(0, 0, 0));
            al_draw_textf(font, al_map_rgb_f(1, 1, 1), 0, 0, 0,
               "Screen saver: %s", __arglist(active ? "Normal" : "Inhibited"));
            al_flip_display();
            al_wait_for_event(events, ref @event);
            switch (@event.type)
            {
                case ALLEGRO_EVENT_KEY_DOWN:
                    if (@event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
                        done = true;
                    else if (@event.keyboard.keycode == ALLEGRO_KEY_SPACE)
                    {
                        if (al_inhibit_screensaver(active))
                        {
                            active = !active;
                        }
                    }
                    break;
            }
        } while (!done);

        al_destroy_font(font);
        al_destroy_event_queue(events);

        return 0;
    }
}