#include <stdlib.h>
#include <gtk/gtk.h>

/* Cria pixbuf a partir de um arquivo */
GdkPixbuf *create_pixbuf_from_file(const gchar * filename) {
    GdkPixbuf *pixbuf;
    GError *error = NULL;
    pixbuf = gdk_pixbuf_new_from_file(filename, &error);
    if(!pixbuf) {
        fprintf(stderr, "%s\n", error->message);
        g_error_free(error);
    }

    return pixbuf;
}

/* Cria pixbuf a partir de um buffer */
GdkPixbuf *create_pixbuf_from_buffer(const gchar * buffer) {
    GdkPixbuf *pixbuf;
    GError *error = NULL;
    int width  = 640;
    int height = 480;
    pixbuf = gdk_pixbuf_new_from_data(buffer,
                                      GDK_COLORSPACE_RGB,
                                      FALSE,
                                      8,
                                      width,
                                      height,
                                      width * 3, // 3 bits por pixel
                                      NULL,
                                      NULL );
    if(!pixbuf) {
        fprintf(stderr, "%s\n", error->message);
        g_error_free(error);
    }

    return pixbuf;
}

expose_event_callback (GtkWidget *widget, GdkEventExpose * event, gpointer data) {
    gdk_draw_pixbuf (widget->window,
                  widget->style->fg_gc[GTK_WIDGET_STATE (widget)], //Graphic Context
                  pixbuf,
                  0, 0, -1, -1,
                  0, 64 * 360);
    return TRUE;
};

int main (int argc, char *argv[])
{
  /*Containers*/
  GtkWidget *win = NULL;
  GtkWidget *vbox;

  /*Menu*/
  GtkWidget *menubarPrincipal;
  GtkWidget *menuDropDown;
  GtkWidget *arquivo;
  GtkWidget *sair;

  GtkWidget *drwArea;

  /* Inicializa GTK+ */
  g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, (GLogFunc) gtk_false, NULL);
  gtk_init (&argc, &argv);
  g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, g_log_default_handler, NULL);

  /* Cria janela principal */
  win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_container_set_border_width (GTK_CONTAINER (win), 8);
  gtk_window_set_title (GTK_WINDOW (win), "Watcher");
  gtk_window_set_position (GTK_WINDOW (win), GTK_WIN_POS_CENTER);
  gtk_window_maximize(GTK_WINDOW (win));
  gtk_window_set_icon(GTK_WINDOW (win), create_pixbuf_from_file("images/icons/web.png"));
  //gtk_widget_realize (win);



  /* Cria caixa vertical do menu principal */
  vbox = gtk_vbox_new(FALSE, 0);
  gtk_container_add(GTK_CONTAINER(win), vbox);

  /*Cria os menus*/
  menubarPrincipal = gtk_menu_bar_new();
  menuDropDown = gtk_menu_new();

  /*Cria os itens de menu */
  // 1 - Menu principal
  arquivo = gtk_menu_item_new_with_label("Arquivo");
  // 2 - Submenus
  sair = gtk_menu_item_new_with_label("Sair");

  /*Aplica menus dropDown nos menus principais*/
  gtk_menu_item_set_submenu(GTK_MENU_ITEM(arquivo), menuDropDown);

  /* Posiciona os itens de menu no menuShell */
  gtk_menu_shell_append(GTK_MENU_SHELL(menuDropDown), sair);
  gtk_menu_shell_append(GTK_MENU_SHELL(menubarPrincipal), arquivo);

  /*Empacota tudo na caixa vertical*/
  gtk_box_pack_start(GTK_BOX(vbox), menubarPrincipal, FALSE, FALSE, 0);

  /*Cria a Drawing Area */
  drwArea = gtk_drawing_area_new();
  gtk_widget_set_size_request(drwArea, 640, 480);

  gtk_container_add(GTK_CONTAINER(win), drwArea);

  /* Conecta os sinais aos eventos */
  g_signal_connect (win, "destroy", gtk_main_quit, NULL);

  g_signal_connect(G_OBJECT(sair), "activate",
        G_CALLBACK(gtk_main_quit), NULL);

  g_signal_connect(G_OBJECT(drwArea), "expose_event",
        G_CALLBACK(expose_event_callback), NULL);

  /* Enter the main loop */
  gtk_widget_show_all (win);
  gtk_main ();
  return 0;
}