using System;

using sharpallegro5;

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

/*
 *    Test program for Allegro.
 *
 *    Resizing the window currently shows broken behaviour.
 */
public class ex_resize2 : AllegroExample
{
    static int Main()
    {
        ALLEGRO_DISPLAY display;
        ALLEGRO_BITMAP bmp;
        ALLEGRO_EVENT_QUEUE queue;
        ALLEGRO_EVENT @event = new ALLEGRO_EVENT();
        bool redraw;

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

        al_set_new_display_flags(ALLEGRO_RESIZABLE |
           ALLEGRO_GENERATE_EXPOSE_EVENTS);
        display = al_create_display(640, 480);
        if (display == IntPtr.Zero)
        {
            abort_example("Unable to set any graphic mode\n");
            return 1;
        }

        al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
        bmp = al_load_bitmap("data/mysha.pcx");
        if (bmp == IntPtr.Zero)
        {
            abort_example("Unable to load image\n");
            return 1;
        }

        queue = al_create_event_queue();
        al_register_event_source(queue, al_get_display_event_source(display));
        al_register_event_source(queue, al_get_keyboard_event_source());

        redraw = true;
        while (true)
        {
            if (redraw && al_is_event_queue_empty(queue))
            {
                al_clear_to_color(al_map_rgb(255, 0, 0));
                al_draw_scaled_bitmap(bmp,
                   0, 0, al_get_bitmap_width(bmp), al_get_bitmap_height(bmp),
                   0, 0, al_get_display_width(display), al_get_display_height(display),
                   0);
                al_flip_display();
                redraw = false;
            }

            al_wait_for_event(queue, ref @event);
            if (@event.type == ALLEGRO_EVENT_DISPLAY_RESIZE)
            {
                al_acknowledge_resize(@event.display.source);
                redraw = true;
            }
            if (@event.type == ALLEGRO_EVENT_DISPLAY_EXPOSE)
            {
                redraw = true;
            }
            if (@event.type == ALLEGRO_EVENT_KEY_DOWN &&
                  @event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
            {
                break;
            }
            if (@event.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
            {
                break;
            }
        }

        al_destroy_bitmap(bmp);
        al_destroy_display(display);

        return 0;

    }
}