/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#include <gtk/gtk.h>

#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"

#include "core/core-types.h"

#include "tips-dialog.h"

#include "gimprc.h"

#include "libgimp/gimpintl.h"


#define TIPS_DIR_NAME "tips"


static void   tips_dialog_destroy (GtkWidget *widget,
				   gpointer   data);
static void   tips_show_previous  (GtkWidget *widget,
				   gpointer   data);
static void   tips_show_next      (GtkWidget *widget,
				   gpointer   data);
static void   tips_toggle_update  (GtkWidget *widget,
				   gpointer   data);
static void   read_tips_file      (gchar     *filename);


static GtkWidget  *tips_dialog   = NULL;
static GtkWidget  *tips_label    = NULL;
static gchar     **tips_text     = NULL;
static gint        tips_count    = 0;
static gint        old_show_tips = 0;


GtkWidget *
tips_dialog_create (void)
{
  GtkWidget *vbox;
  GtkWidget *vbox2;
  GtkWidget *hbox;
  GtkWidget *bbox;
  GtkWidget *button;
  GdkPixbuf *wilber;
  gchar     *filename;

  if (tips_count == 0)
    {
      gchar *temp;

      temp = g_build_filename (gimp_data_directory (), TIPS_DIR_NAME,
                               _("gimp_tips.txt"), NULL);
      read_tips_file (temp);
      g_free (temp);
    }

  if (gimprc.last_tip >= tips_count || gimprc.last_tip < 0)
    gimprc.last_tip = 0;

  if (tips_dialog)
    return tips_dialog;

  tips_dialog = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_type_hint (GTK_WINDOW (tips_dialog),
			    GDK_WINDOW_TYPE_HINT_DIALOG);
  gtk_window_set_wmclass (GTK_WINDOW (tips_dialog), "tip_of_the_day", "Gimp");
  gtk_window_set_title (GTK_WINDOW (tips_dialog), _("GIMP Tip of the Day"));
  gtk_window_set_position (GTK_WINDOW (tips_dialog), GTK_WIN_POS_CENTER);
  gtk_window_set_policy (GTK_WINDOW (tips_dialog), FALSE, TRUE, FALSE);

  g_signal_connect (G_OBJECT (tips_dialog), "delete_event",
		      G_CALLBACK (gtk_widget_destroy),
		      NULL);

  g_signal_connect (G_OBJECT (tips_dialog), "destroy",
		    G_CALLBACK (tips_dialog_destroy),
		    NULL);

  /* destroy the tips window if the mainlevel gtk_main() function is left */
  gtk_quit_add_destroy (1, GTK_OBJECT (tips_dialog));

  vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (tips_dialog), vbox);      
  gtk_widget_show (vbox);

  hbox = gtk_hbox_new (FALSE, 5);
  gtk_container_set_border_width (GTK_CONTAINER (hbox), 10);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
  gtk_widget_show (hbox);

  tips_label = gtk_label_new (tips_text[gimprc.last_tip]);
  gtk_label_set_justify (GTK_LABEL (tips_label), GTK_JUSTIFY_LEFT);
  gtk_misc_set_alignment (GTK_MISC (tips_label), 0.5, 0.5);
  gtk_box_pack_start (GTK_BOX (hbox), tips_label, TRUE, TRUE, 3);
  gtk_widget_show (tips_label);

  vbox2 = gtk_vbox_new (FALSE, 0);
  gtk_box_pack_end (GTK_BOX (hbox), vbox2, FALSE, FALSE, 0);
  gtk_widget_show (vbox2);

  filename = g_build_filename (gimp_data_directory(), 
                               "images", "tips_wilber.png", NULL);
  wilber = gdk_pixbuf_new_from_file (filename, NULL);
  g_free (filename);

  if (wilber)
    {
      GtkWidget *image;

      image = gtk_image_new_from_pixbuf (wilber);
      g_object_unref (wilber);

      gtk_box_pack_start (GTK_BOX (vbox2), image, TRUE, FALSE, 0);
      gtk_widget_show (image);
    }

  hbox = gtk_hbox_new (FALSE, 15);
  gtk_container_set_border_width (GTK_CONTAINER (hbox), 10);
  gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
  gtk_widget_show (hbox);

  button = gtk_check_button_new_with_label (_("Show tip next time GIMP starts"));
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), gimprc.show_tips);
  gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
  gtk_widget_show (button);

  g_signal_connect (G_OBJECT (button), "toggled",
		    G_CALLBACK (tips_toggle_update),
		    &gimprc.show_tips);

  old_show_tips = gimprc.show_tips;

  bbox = gtk_hbutton_box_new ();
  gtk_box_pack_end (GTK_BOX (hbox), bbox, FALSE, FALSE, 0);
  gtk_widget_show (bbox);

  button = gtk_button_new_from_stock (GTK_STOCK_CLOSE);
  GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
  gtk_window_set_default (GTK_WINDOW (tips_dialog), button);
  gtk_container_add (GTK_CONTAINER (bbox), button);
  gtk_widget_show (button);

  g_signal_connect_swapped (G_OBJECT (button), "clicked",
			    G_CALLBACK (gtk_widget_destroy),
			    tips_dialog);

  bbox = gtk_hbutton_box_new ();
  gtk_button_box_set_layout (GTK_BUTTON_BOX (bbox), GTK_BUTTONBOX_END);
  gtk_button_box_set_spacing (GTK_BUTTON_BOX (bbox), 5);
  gtk_box_pack_end (GTK_BOX (hbox), bbox, FALSE, FALSE, 0);
  gtk_widget_show (bbox);

  button = gtk_button_new_with_label (_("Previous Tip"));
  GTK_WIDGET_UNSET_FLAGS (button, GTK_RECEIVES_DEFAULT);
  gtk_widget_set_sensitive (button, (tips_count > 1));
  gtk_container_add (GTK_CONTAINER (bbox), button);
  gtk_widget_show (button);

  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (tips_show_previous),
		    NULL);

  button = gtk_button_new_with_label (_("Next Tip"));
  GTK_WIDGET_UNSET_FLAGS (button, GTK_RECEIVES_DEFAULT);
  gtk_widget_set_sensitive (button, (tips_count > 1));
  gtk_container_add (GTK_CONTAINER (bbox), button);
  gtk_widget_show (button);

  g_signal_connect (G_OBJECT (button), "clicked",
		    G_CALLBACK (tips_show_next),
		    NULL);

  /*  Connect the "F1" help key  */
  gimp_help_connect (tips_dialog,
		     gimp_standard_help_func,
		     "dialogs/tip_of_the_day.html");

  return tips_dialog;
}

static void
tips_dialog_destroy (GtkWidget *widget,
		     gpointer   data)
{
  GList *update = NULL; /* options that should be updated in .gimprc */
  GList *remove = NULL; /* options that should be commented out */

  tips_dialog = NULL;

  /* the last-shown-tip is now saved in sessionrc */

  if (gimprc.show_tips != old_show_tips)
    {
      update = g_list_append (update, "show-tips");
      remove = g_list_append (remove, "dont-show-tips");
      old_show_tips = gimprc.show_tips;
      gimprc_save (&update, &remove);
    }
  g_list_free (update);
  g_list_free (remove);
}

static void
tips_show_previous (GtkWidget *widget,
		    gpointer  data)
{
  gimprc.last_tip--;

  if (gimprc.last_tip < 0)
    gimprc.last_tip = tips_count - 1;

  gtk_label_set_text (GTK_LABEL (tips_label), tips_text[gimprc.last_tip]);
}

static void
tips_show_next (GtkWidget *widget,
		gpointer   data)
{
  gimprc.last_tip++;

  if (gimprc.last_tip >= tips_count)
    gimprc.last_tip = 0;

  gtk_label_set_text (GTK_LABEL (tips_label), tips_text[gimprc.last_tip]);
}

static void
tips_toggle_update (GtkWidget *widget,
		    gpointer   data)
{
  gint *toggle_val;

  toggle_val = (gint *) data;

  if (GTK_TOGGLE_BUTTON (widget)->active)
    *toggle_val = TRUE;
  else
    *toggle_val = FALSE;
}

static void
store_tip (gchar *str)
{
  tips_count++;
  tips_text = g_realloc (tips_text, sizeof (gchar *) * tips_count);
  tips_text[tips_count - 1] = str;
}

static void
read_tips_file (gchar *filename)
{
  FILE *fp;
  gchar *tip = NULL;
  gchar *str = NULL;

  fp = fopen (filename, "rt");
  if (!fp)
    {
      store_tip (_("Your GIMP tips file appears to be missing!\n"
		   "There should be a file called gimp_tips.txt in\n"
		   "the tips subdirectory of the GIMP data directory.\n"
		   "Please check your installation."));
      return;
    }

  str = g_new (char, 1024);
  while (!feof (fp))
    {
      if (!fgets (str, 1024, fp))
	continue;
   
      if (str[0] == '#' || str[0] == '\n')
	{
	  if (tip != NULL)
	    {
	      tip[strlen (tip) - 1] = '\000';
	      store_tip (tip);
	      tip = NULL;
	    }
	}
      else
	{
	  if (tip == NULL)
	    {
	      tip = g_malloc (strlen (str) + 1);
	      strcpy (tip, str);
	    }
	  else
	    {
	      tip = g_realloc (tip, strlen (tip) + strlen (str) + 1);
	      strcat (tip, str);
	    }
	}
    }
  if (tip != NULL)
    store_tip (tip);
  g_free (str);
  fclose (fp);
}