/* 
 * Build:
 * gcc $(pkg-config --cflags gtk+-3.0) sample.c -o sample $(pkg-config --libs gtk+-3.0)
 */

#include <gtk/gtk.h>

gchar*
format (GtkScale *scale, gdouble value, gpointer user_data)
{
  gint h, min;

  if ( (gint)value <= 14 )
    return g_strdup ("Never!");
  else if ( (gint)value < 60 )
    return g_strdup_printf ("%d %s", (gint) value, "minutes");
  else if ( (gint)value == 60)
    return g_strdup ("One hour");

  h = (gint)value/60;
  min = (gint)value%60;

  if ( h <= 1 )
    if ( min == 0 )      return g_strdup_printf ("%s", "One hour");
    else if ( min == 1 ) return g_strdup_printf ("%s %s", "One hour",  "one minute");
    else                 return g_strdup_printf ("%s %d %s", "One hour", min, "minutes");
  else
    if ( min == 0 )      return g_strdup_printf ("%d %s", h, "hours");
    else if ( min == 1 ) return g_strdup_printf ("%d %s %s", h, "hours", "one minute");
    else                 return g_strdup_printf ("%d %s %d %s", h, "hours", min, "minutes");
}

gboolean
sync_label (GtkRange *range, GtkScrollType scroll, gdouble value, gpointer user_data)
{
    GtkWidget *label = GTK_WIDGET (user_data);
    gchar *formatted_value = format (NULL, value, NULL);
    gtk_label_set_text (GTK_LABEL (label), formatted_value);
    g_free (formatted_value);

    return FALSE;
}

int
main (int argc, char *argv[])
{
  GtkWidget *window, *box, *box2, *scale, *scale2, *label;
  GtkCssProvider *css_provider;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_position (GTK_WINDOW (window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size (GTK_WINDOW (window), 150, 70);

  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
  gtk_container_add (GTK_CONTAINER (window), box);

  scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 14, 360, 5);
  gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_BOTTOM);
  gtk_container_add (GTK_CONTAINER (box), scale);

  box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
  gtk_container_add (GTK_CONTAINER (box), box2);

  scale2 = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 14, 360, 5);
  gtk_style_context_add_class (gtk_widget_get_style_context (scale2), "custom-scale");
  gtk_scale_set_draw_value (GTK_SCALE (scale2), FALSE);
  gtk_container_add (GTK_CONTAINER (box2), scale2);

  label = gtk_label_new ("foo");
  gtk_container_add (GTK_CONTAINER (box2), label);

  g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (gtk_main_quit), NULL);
  g_signal_connect (G_OBJECT (scale), "format-value", G_CALLBACK (format), NULL);
  g_signal_connect (G_OBJECT (scale2), "change-value", G_CALLBACK (sync_label), label);

  css_provider = gtk_css_provider_new ();
  gtk_css_provider_load_from_data (css_provider, ".custom-scale { padding-bottom: 0; }", -1, NULL);
  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
                                             GTK_STYLE_PROVIDER (css_provider),
                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
  g_object_unref (css_provider);

  gtk_widget_show_all (window);

  gtk_main ();

  return 0;
}