#include <gtk/gtk.h>

static void print (GtkWidget *widget, gpointer data) {g_print (data);}

static void activate (GtkApplication *app, gpointer user_data) {
  GtkWidget *button_0 = gtk_button_new_with_label ("Quit");
  GtkWidget *button_1 = gtk_button_new_with_label ("I");
  GtkWidget *button_2 = gtk_button_new_with_label ("II");
  GtkWidget *button_3 = gtk_button_new_with_label ("III");
  GtkWidget *button_4 = gtk_button_new_with_label ("IV");
  GtkWidget *button_5 = gtk_button_new_with_label ("V");

  GtkWidget *window   = gtk_application_window_new (app);
  GtkWidget *titlebar = gtk_header_bar_new();

  GtkWidget *switcher = gtk_stack_switcher_new();
//  GtkWidget *sidebar  = gtk_stack_sidebar_new();
  GtkStack  *stack    = GTK_STACK (gtk_stack_new());
  GtkWidget *page_1   = gtk_paned_new(GTK_ORIENTATION_VERTICAL);
  GtkWidget *page_2   = gtk_paned_new(GTK_ORIENTATION_VERTICAL);
  GtkWidget *grid     = gtk_grid_new();
  GtkWidget *grid_3   = gtk_grid_new();
  GtkWidget *box      = gtk_box_new (0, 6); // 6 = spacing

  gtk_window_set_title (GTK_WINDOW (window), "Window");
  gtk_widget_set_size_request (window, 60, 0);
  gtk_window_set_titlebar (GTK_WINDOW (window), titlebar);   //   header_bar
//  gtk_window_set_overlay (GTK_WINDOW (window), overlay);     //   overlay
  gtk_window_set_child (GTK_WINDOW (window), grid);

  g_signal_connect (button_1, "clicked", G_CALLBACK (print), "I'm n°1\n");
  gtk_grid_attach (GTK_GRID (grid), button_1, 0, 0, 1, 1);
  g_signal_connect (button_2, "clicked", G_CALLBACK (print), "I'm n°2\n");
  gtk_grid_attach (GTK_GRID (grid), button_2, 1, 0, 1, 1);
  g_signal_connect (button_0, "clicked", G_CALLBACK (print), "bye !...\n");
  g_signal_connect_swapped (button_0, "clicked", G_CALLBACK (gtk_window_destroy), window);
  gtk_grid_attach (GTK_GRID (grid), button_0, 0, 1, 2, 1);
  gtk_box_append (GTK_BOX (box), button_3);
  gtk_box_append (GTK_BOX (box), button_4);
  gtk_grid_attach (GTK_GRID (grid), box, 0, 2, 2, 1);

// https://developer-old.gnome.org/gtk4/stable/GtkStack.html
// https://developer.gnome.org/documentation/index.html
// https://docs.gtk.org/gtk4/enum.AccessibleRole.html

//  GtkToggleButton *tb1 =  GTK_TOGGLE_BUTTON (gtk_button_new_with_label ("tb1"));
  gtk_stack_add_titled (stack, page_1, "n°0", "A");
  gtk_stack_add_titled (stack, page_2, "n°1", "B");
  GtkStackPage *page_3 =  gtk_stack_add_titled (stack, grid_3, "n°2", "C");
  gtk_grid_attach (GTK_GRID (grid_3), button_5, 0, 0, 1, 1);


  gtk_orientable_set_orientation (GTK_ORIENTABLE (switcher), GTK_ORIENTATION_VERTICAL);
  gtk_orientable_set_orientation (GTK_ORIENTABLE (switcher), GTK_ORIENTATION_HORIZONTAL);

  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher), stack);
//  gtk_stack_sidebar_set_stack (GTK_STACK_SIDEBAR (sidebar), stack);

//  gtk_stack_page_get_child (GTK_STACK_PAGE(page_1));
  gtk_stack_page_set_name (GTK_STACK_PAGE(page_3), "new name");

  GtkSelectionModel *stack_selection_model = gtk_stack_get_pages (stack);
  gtk_selection_model_select_item (stack_selection_model, 2, 1);
//  gtk_stack_set_visible_child_name (stack, "n°3");

  printf("selected page name is [%s]  (can't get its title !)\n",
          gtk_stack_get_visible_child_name (stack));
  gtk_stack_set_transition_type (GTK_STACK (stack),
                               GTK_STACK_TRANSITION_TYPE_CROSSFADE);

  gtk_grid_attach (GTK_GRID (grid), switcher, 0, 3, 2, 1);
  gtk_window_present (GTK_WINDOW (window));
}

int
main (int    argc,
      char **argv)
{
  GtkApplication *app;
  int status;

  app = gtk_application_new ("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  status = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);

  return status;
}

/*  GtkBox       GtkGrid     GtkRevealer    GtkStack
 *  GtkOverlay   GtkPaned    GtkExpander    GtkFixed  */

/* GtkBox
 * int spacing = 8;
 * box = gtk_box_new (0, spacing);
 * 0 = GTK_ORIENTATION_HORIZONTAL, 1 = GTK_ORIENTATION_VERTICAL
 * gtk_widget_set_halign (box, GTK_ALIGN_FILL);
 * gtk_widget_set_valign (box, GTK_ALIGN_CENTER); *  START  CENTER  END  FILL *
 * gtk_window_set_child (GTK_WINDOW (window), box);
 * gtk_box_append (GTK_BOX (box), button); */

/*  grid = gtk_grid_new ();
    gtk_window_set_child (GTK_WINDOW (window), grid);
    button = gtk_button_new_with_label (" I ");               n fois
    gtk_grid_attach (GTK_GRID (grid), button, 0, 0, 1, 1);    n fois  */





/* TODO or NOT TODO
 *
 *   GtkRevealer *revealer = gtk_revealer_new();
 *   gtk_revealer_set_child (GTK_ ? (revealer), box);
 *   gtk_revealer_set_transition_type (revealer, GTK_REVEALER_TRANSITION_TYPE_SLIDE_DOWN);
 *
 */

//  GtkWidget *overlay  = gtk_overlay_new();
//  gtk_overlay_set_buildable_id (GTK_BUILDABLE(overlay), "overlay id");
//  printf("overlay  %s\n", gtk_buildable_get_buildable_id (GTK_BUILDABLE(overlay)));

//  how do I attach a widget to a page ?