/* -*- Mode: C; c-basic-offset: 4 -*- */
/* Dia -- an diagram creation/manipulation program
 * Copyright (C) 1998-2000 Alexander Larsson
 *
 * recent_files.c: recent files menu dia
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef GNOME
#include <gnome.h>
#else
#include <gdk/gdkkeysyms.h>
#endif

#include <glib.h>
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>

#include "dia_dirs.h"
#include "recent_files.h"
#include "menus.h"
#include "diagram.h"
#include "display.h"
#include "interface.h"
#include "layer_dialog.h"
#include "preferences.h"
#include "../lib/filter.h"
#include "../lib/intl.h"
#include "message.h"
#include "persistence.h"

static void open_recent_file_callback (GtkWidget *widget, gpointer data);
void recent_file_history_remove (const char *fname);

static void
recent_file_history_clear_menu()
{
  menus_clear_recent ();
}

/** 
 * Build and insert the recent files menu.
 */
static void
recent_file_history_make_menu()
{
  GList *items;
  GtkActionGroup *group;
  GtkAction *action;
  gint i = 0;

  items = persistent_list_get_glist ("recent-files");
  if (!items)
    return; /* on first start this is the usual case */

  group = gtk_action_group_new ("recent-files");
  gtk_action_group_set_translation_domain (group, NULL);

  for (i = 0; 
       items != NULL && i < prefs.recent_documents_list_size; 
       items = g_list_next(items), i++) {

    gchar *name = g_strdup_printf ("FileRecent_%d", i);
    gchar *file = g_path_get_basename ((const gchar *) items->data);
    gchar **split = g_strsplit (file, "_", -1);
    gchar *file_escaped = g_strjoinv ("__", split);
    gchar *label = g_strdup_printf ("_%d. %s", i + 1, file_escaped);
    gchar *accel = g_strdup_printf ("<control>%d", i + 1);

    action = gtk_action_new (name, label, 
			     (const gchar *) items->data,
			     NULL);
    g_signal_connect (G_OBJECT (action), "activate", 
		      G_CALLBACK (open_recent_file_callback),
		      items->data);

    gtk_action_group_add_action_with_accel (group, action, accel);

    g_free (name);
    g_free (file);
    g_strfreev (split);
    g_free (file_escaped);
    g_free (label);
    g_free (accel);
  }
  menus_set_recent (group);
}

/** Add a new item to the file history list.
 * Since this only happens when a new files is opened, we can afford the
 * time it takes to rebuild the menus, rather than messing around with
 * moving them.
 */
void
recent_file_history_add(const char *fname)
{
  gchar *absname = dia_get_absolute_filename(fname);
  gchar *filename = g_filename_to_utf8(absname, -1, NULL, NULL, NULL);
  recent_file_history_clear_menu();
  persistent_list_add("recent-files", filename);
  g_free(absname);
  g_free(filename);
    
  recent_file_history_make_menu();
}

/* load the recent file history */
void
recent_file_history_init() 
{
  prefs.recent_documents_list_size = CLAMP(prefs.recent_documents_list_size, 0, 16);
    
  persistence_register_list("recent-files");

  recent_file_history_make_menu();
}

/* remove a broken file from the history and update menu accordingly
 * Xing Wang, 2002.06 */
void
recent_file_history_remove (const char *fname) 
{
  gchar *absname = dia_get_absolute_filename(fname);
  gchar *filename = g_filename_to_utf8(absname, -1, NULL, NULL, NULL);
  
  recent_file_history_clear_menu();

  persistent_list_remove("recent-files", filename);
  g_free(absname);
  g_free(filename);

  recent_file_history_make_menu();
}
    
static void
open_recent_file_callback(GtkWidget *widget, gpointer data)
{
  DiaImportFilter *ifilter = NULL;
  Diagram *diagram = NULL;
  gchar *filename = g_filename_from_utf8((gchar *)data, -1, NULL, NULL, NULL);

  ifilter = filter_guess_import_filter(filename);

  diagram = diagram_load(filename, ifilter);
  if (diagram != NULL) {
    diagram_update_extents(diagram);
    layer_dialog_set_diagram(diagram);
    if (diagram->displays == NULL) {
      new_display(diagram);
    }
  } else
    recent_file_history_remove (filename);
  g_free(filename);
}