#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <cairo.h>
#include <time.h>
#include <stdlib.h>
#include <glib/gprintf.h>

#define SECOND_INTERVAL  1000

#define DEFAULT_WIDTH  200
#define DEFAULT_HEIGHT 15

struct private {
	time_t time;
	time_t von_arrives;
	struct tm    *tm;
};

static gboolean time_handler (GtkWidget* w)
{
	gtk_widget_queue_draw (w);
	return TRUE;
}

gboolean on_key_press (GtkWidget *widget, GdkEventKey *key, gpointer p) {
	if (key->type == GDK_KEY_PRESS)
	{
		switch (key->keyval)
		{
			case GDK_Escape :
				gtk_main_quit ();
			break;
		}
	}

	return FALSE;
}

static void paint (GtkWidget *widget, GdkEventExpose *eev, struct private *p) {
	gint width, height;
	cairo_t *cr;
	gchar *gc_time;
	

	gint sec, min, hour, day;

	p->time = p->von_arrives - time(NULL);
	p->tm = localtime (&p->time);

	day  = p->time / (3600*24);
	p->time -= day*(3600*24);

	hour = p->time / 3600;
	p->time -= hour*3600;
       
	min  = p->time/60;
	p->time -= min*60;

	sec  = p->time;

	gc_time = g_strdup_printf("Von arrives in %02dd %02dh %02dm %02ds", day, hour, min, sec);
	
	width  = widget->allocation.width;
	height = widget->allocation.height;

	cr = gdk_cairo_create (widget->window);
	cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);

	
	cairo_set_source_rgba (cr, 1.0f, 1.0f, 1.0f, 0.4f);
	cairo_paint (cr);

	cairo_select_font_face (cr, "Sans", CAIRO_FONT_SLANT_NORMAL,
				            CAIRO_FONT_WEIGHT_BOLD);
		
	cairo_save (cr);
	  cairo_set_font_size (cr, 10);
	  cairo_move_to (cr, 10, 10);
	  cairo_set_source_rgba (cr, 0.0f, 0.0f, 0.0f, 1.0f);
	  cairo_show_text (cr, gc_time);
	cairo_restore (cr);

	cairo_destroy (cr);
}

static void install_colormap (GtkWidget *w) {
	GdkScreen* screen     = gtk_widget_get_screen (w);
	GdkColormap* colormap = gdk_screen_get_rgba_colormap (screen);

	if (!colormap)
		colormap = gdk_screen_get_rgb_colormap (screen);

	gtk_widget_set_colormap (w, colormap);
}	       
	
gint main (gint argc, gchar **argv) { 
	GtkWidget *window;

	struct private *p = malloc(sizeof(struct private));
	struct tm von_time = {
		.tm_min   = 40,
		.tm_hour  = 9,
		.tm_mday  = 14,
		.tm_mon   = 1,
		.tm_year  = 107,
	};

	p->von_arrives =  mktime(&von_time);

	gtk_init(&argc, &argv);
	
	window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

	gtk_window_stick (GTK_WINDOW (window));
	gtk_window_set_keep_below (GTK_WINDOW (window), TRUE);

        gtk_window_set_skip_taskbar_hint (GTK_WINDOW (window), TRUE);
	gtk_window_set_skip_pager_hint   (GTK_WINDOW (window), TRUE);
	gtk_window_set_accept_focus      (GTK_WINDOW (window), FALSE);

	gtk_window_set_decorated (GTK_WINDOW (window), FALSE);
	gtk_window_set_resizable (GTK_WINDOW (window), TRUE);
	gtk_widget_set_app_paintable (window, TRUE);
	
	gtk_window_set_default_size (GTK_WINDOW (window),
				     DEFAULT_WIDTH,
				     DEFAULT_HEIGHT);

	install_colormap(window);
	
	gtk_widget_add_events (window, GDK_BUTTON_PRESS_MASK);

	g_signal_connect (G_OBJECT (window), "expose-event",
			  G_CALLBACK (paint),
			  p);
	
	g_signal_connect (G_OBJECT (window),
			  "key-press-event",
			  G_CALLBACK (on_key_press),
			  NULL);

	gtk_widget_show_all (window);

	gtk_timeout_add (SECOND_INTERVAL, (GtkFunction) time_handler, window);

	gtk_main ();

	return 0;
}