#include <gtk/gtk.h>

#define THUNAR_TYPE_FILENAME_INPUT thunar_filename_input_get_type ()
G_DECLARE_FINAL_TYPE (ThunarFilenameInput, thunar_filename_input, THUNAR, FILENAME_INPUT, GtkBox)

struct _ThunarFilenameInput
{
  GtkBox parent;
  GtkEntry *entry;
  GtkLabel *label;
  gint max_text_length;
};

G_DEFINE_TYPE (ThunarFilenameInput, thunar_filename_input, GTK_TYPE_BOX)

void thunar_filename_input_changed (GtkEditable *editable, gpointer user_data);
const gchar* thunar_filename_input_get_text (ThunarFilenameInput *filename_input);


static void thunar_filename_input_class_init (ThunarFilenameInputClass *klass) 
{
  GtkWidgetClass *gtkwidget_class;
  gtkwidget_class = GTK_WIDGET_CLASS (klass);

  g_signal_new  ("text-valid",
                 G_TYPE_FROM_CLASS (klass),
                 G_SIGNAL_RUN_LAST,
                 0 /* closure */,
                 NULL /* accumulator */,
                 NULL /* accumulator data */,
                 NULL /* C marshaller */,
                 G_TYPE_NONE /* return_type */,
                 0     /* n_params */);

  g_signal_new  ("text-invalid",
                 G_TYPE_FROM_CLASS (klass),
                 G_SIGNAL_RUN_LAST,
                 0 /* closure */,
                 NULL /* accumulator */,
                 NULL /* accumulator data */,
                 NULL /* C marshaller */,
                 G_TYPE_NONE /* return_type */,
                 0     /* n_params */);

}

static void thunar_filename_input_init (ThunarFilenameInput *filename_input)
{
  gtk_orientable_set_orientation (GTK_ORIENTABLE(filename_input),GTK_ORIENTATION_VERTICAL);
  gtk_container_set_border_width (GTK_CONTAINER (filename_input), 2);

  filename_input->max_text_length = 10;
  
  filename_input->entry = GTK_ENTRY(gtk_entry_new());
  gtk_widget_set_hexpand (GTK_WIDGET(filename_input->entry), TRUE);
  gtk_widget_set_valign (GTK_WIDGET(filename_input->entry), GTK_ALIGN_CENTER);
  gtk_box_pack_start (GTK_BOX (filename_input),GTK_WIDGET(filename_input->entry),FALSE,FALSE,0);

  filename_input->label = GTK_LABEL(gtk_label_new(""));
  gtk_label_set_xalign (filename_input->label, 0.0f);
  gtk_widget_set_hexpand (GTK_WIDGET(filename_input->label), TRUE);
  gtk_box_pack_start (GTK_BOX (filename_input),GTK_WIDGET(filename_input->label),FALSE,FALSE,0);

  g_signal_connect (filename_input->entry, "changed",
                    G_CALLBACK (thunar_filename_input_changed), filename_input);
  g_signal_emit_by_name(filename_input->entry,"changed",0);

}

const gchar* thunar_filename_input_get_text (ThunarFilenameInput *filename_input){
  return gtk_entry_get_text(filename_input->entry);
}


void
thunar_filename_input_changed (GtkEditable *editable, gpointer user_data)
{
  ThunarFilenameInput *filename_input = THUNAR_FILENAME_INPUT(user_data);
  GtkEntry *entry = GTK_ENTRY(editable);
  GtkLabel *label = filename_input->label;
  gint text_length;
  const gchar *text;
  const gchar *p;
  const gchar *label_text = "";
  const gchar *icon_name = NULL;
  gchar *stripped_text;

  text_length = gtk_entry_get_text_length(entry);
  text = gtk_entry_get_text (entry);
  stripped_text = g_strdup(text);
  g_strstrip (stripped_text);

  if (text_length == 0){
    gtk_entry_set_icon_from_icon_name (entry,
                                       GTK_ENTRY_ICON_SECONDARY,
                                       NULL);
    gtk_label_set_text (label,"");
    gtk_entry_set_activates_default (entry, FALSE);
    g_signal_emit_by_name(filename_input,"text-invalid",0);
    g_free(stripped_text);
    return;
  }

  if (g_strcmp0(text,stripped_text) != 0){
    label_text = "Filenames should not start or end with a space";
    icon_name = "dialog-warning";
  }
  g_free(stripped_text);


  for (p = text; *p != '\0'; ++p)
    if (G_UNLIKELY (G_IS_DIR_SEPARATOR (*p)))
      break;
  
  if (*p != '\0'){
    label_text = "Directory separator illegal in file name";
    icon_name = "dialog-error";
  }
  else if(text_length > filename_input->max_text_length){
    label_text = "Filename is too long";
    icon_name = "dialog-error";
  }
  
  gtk_entry_set_icon_from_icon_name (entry,
                                     GTK_ENTRY_ICON_SECONDARY,
                                     icon_name);
  gtk_entry_set_activates_default (entry, g_strcmp0(icon_name,"dialog-error") != 0);
  gtk_label_set_text (label,label_text);
  if(g_strcmp0(icon_name,"dialog-error") != 0)
    g_signal_emit_by_name(filename_input,"text-valid",0);
  else
     g_signal_emit_by_name(filename_input,"text-invalid",0);
}

static void text_invalid( GtkWidget *widget,
                            gpointer   data )
{
  gtk_widget_set_sensitive(widget,FALSE);
}

static void text_valid( GtkWidget *widget,
                            gpointer   data )
{
  gtk_widget_set_sensitive(widget,TRUE);
}

int main(int argc, char *argv[])
{
  GtkWidget *dialog;
  gint response;
  ThunarFilenameInput *filename_input;
  const gchar *filename;

  gtk_init(&argc, &argv);
  
  dialog = gtk_dialog_new_with_buttons ("Enter file name",
                                        NULL,
                                        GTK_DIALOG_MODAL
                                        | GTK_DIALOG_DESTROY_WITH_PARENT,
                                        "Cancel", GTK_RESPONSE_CANCEL,
                                        "Rename", GTK_RESPONSE_OK,
                                        NULL);
  gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_OK);
  gtk_window_set_default_size (GTK_WINDOW(dialog),250,-1);

  filename_input = g_object_new (THUNAR_TYPE_FILENAME_INPUT,NULL);
  gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),GTK_WIDGET(filename_input));
  gtk_widget_show_all (GTK_WIDGET(filename_input));

  g_signal_connect_swapped(filename_input,"text-invalid",G_CALLBACK(text_invalid),
                           gtk_dialog_get_widget_for_response(GTK_DIALOG(dialog),GTK_RESPONSE_OK));
  g_signal_connect_swapped(filename_input,"text-valid",G_CALLBACK(text_valid),
                           gtk_dialog_get_widget_for_response(GTK_DIALOG(dialog),GTK_RESPONSE_OK));
  

  response = gtk_dialog_run (GTK_DIALOG (dialog));
  filename = thunar_filename_input_get_text(filename_input);
  if (response == GTK_RESPONSE_OK)
    g_message("Chosen filename: %s\n",filename);
  if (response == GTK_RESPONSE_CANCEL)
    g_message("Operation cancelled\n");
  gtk_widget_destroy (dialog);


  return 0;
}