/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2002-2007 Imendio AB
 * Copyright (C) 2007-2008 Collabora Ltd.
 *
 * 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., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 *
 * Authors: Mikael Hallendal <micke@imendio.com>
 *          Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Xavier Claessens <xclaesse@gmail.com>
 *          Jonny Lamb <jonny.lamb@collabora.co.uk>
 *
 *          Part of this file is copied from GtkSourceView (gtksourceiter.c):
 *          Paolo Maggi
 *          Jeroen Zwartepoorte
 */

#include <config.h>

#include <string.h>
#include <X11/Xatom.h>
#include <gdk/gdkx.h>
#include <glib/gi18n-lib.h>
#include <gtk/gtk.h>
#include <gio/gio.h>

#include "empathy-ui-utils.h"
#include "empathy-images.h"
#include "empathy-smiley-manager.h"
#include "empathy-conf.h"

#define DEBUG_FLAG EMPATHY_DEBUG_OTHER
#include <libempathy/empathy-debug.h>
#include <libempathy/empathy-utils.h>
#include <libempathy/empathy-dispatcher.h>
#include <libempathy/empathy-idle.h>
#include <libempathy/empathy-ft-factory.h>

void
empathy_gtk_init (void)
{
	static gboolean initialized = FALSE;

	if (initialized)
		return;

	empathy_init ();
	gtk_icon_theme_append_search_path (gtk_icon_theme_get_default (),
					   PKGDATADIR G_DIR_SEPARATOR_S "icons");

	initialized = TRUE;
}

static GtkBuilder *
builder_get_file_valist (const gchar *filename,
			 const gchar *first_object,
			 va_list      args)
{
	GtkBuilder  *gui;
	const gchar *name;
	GObject    **object_ptr;
	GError      *error = NULL;

	DEBUG ("Loading file %s", filename);

	gui = gtk_builder_new ();
	gtk_builder_set_translation_domain (gui, GETTEXT_PACKAGE);
	if (!gtk_builder_add_from_file (gui, filename, &error)) {
		g_critical ("GtkBuilder Error (%s): %s",
				filename, error->message);
		g_clear_error (&error);
		g_object_unref (gui);

		/* we need to iterate and set all of the pointers to NULL */
		for (name = first_object; name;
		     name = va_arg (args, const gchar *)) {
			object_ptr = va_arg (args, GObject**);

			*object_ptr = NULL;
		}

		return NULL;
	}

	for (name = first_object; name; name = va_arg (args, const gchar *)) {
		object_ptr = va_arg (args, GObject**);

		*object_ptr = gtk_builder_get_object (gui, name);

		if (!*object_ptr) {
			g_warning ("File is missing object '%s'.", name);
			continue;
		}
	}

	return gui;
}

GtkBuilder *
empathy_builder_get_file (const gchar *filename,
			  const gchar *first_object,
			  ...)
{
	GtkBuilder *gui;
	va_list     args;

	va_start (args, first_object);
	gui = builder_get_file_valist (filename, first_object, args);
	va_end (args);

	return gui;
}

void
empathy_builder_connect (GtkBuilder *gui,
			 gpointer    user_data,
			 gchar      *first_object,
			 ...)
{
	va_list      args;
	const gchar *name;
	const gchar *sig;
	GObject     *object;
	GCallback    callback;

	va_start (args, first_object);
	for (name = first_object; name; name = va_arg (args, const gchar *)) {
		sig = va_arg (args, const gchar *);
		callback = va_arg (args, GCallback);

		object = gtk_builder_get_object (gui, name);
		if (!object) {
			g_warning ("File is missing object '%s'.", name);
			continue;
		}

		g_signal_connect (object, sig, callback, user_data);
	}

	va_end (args);
}

GtkWidget *
empathy_builder_unref_and_keep_widget (GtkBuilder *gui,
				       GtkWidget  *widget)
{
	/* On construction gui sinks the initial reference to widget. When gui
	 * is finalized it will drop its ref to widget. We take our own ref to
	 * prevent widget being finalised. The widget is forced to have a
	 * floating reference, like when it was initially unowned so that it can
	 * be used like any other GtkWidget. */

	g_object_ref (widget);
	g_object_force_floating (G_OBJECT (widget));
	g_object_unref (gui);

	return widget;
}

const gchar *
empathy_icon_name_for_presence (TpConnectionPresenceType presence)
{
	switch (presence) {
	case TP_CONNECTION_PRESENCE_TYPE_AVAILABLE:
		return EMPATHY_IMAGE_AVAILABLE;
	case TP_CONNECTION_PRESENCE_TYPE_BUSY:
		return EMPATHY_IMAGE_BUSY;
	case TP_CONNECTION_PRESENCE_TYPE_AWAY:
		return EMPATHY_IMAGE_AWAY;
	case TP_CONNECTION_PRESENCE_TYPE_EXTENDED_AWAY:
		return EMPATHY_IMAGE_EXT_AWAY;
	case TP_CONNECTION_PRESENCE_TYPE_HIDDEN:
		return EMPATHY_IMAGE_HIDDEN;
	case TP_CONNECTION_PRESENCE_TYPE_OFFLINE:
	case TP_CONNECTION_PRESENCE_TYPE_ERROR:
	case TP_CONNECTION_PRESENCE_TYPE_UNKNOWN:
		return EMPATHY_IMAGE_OFFLINE;
	case TP_CONNECTION_PRESENCE_TYPE_UNSET:
		return NULL;
	}

	return NULL;
}

const gchar *
empathy_icon_name_for_contact (EmpathyContact *contact)
{
	TpConnectionPresenceType presence;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact),
			      EMPATHY_IMAGE_OFFLINE);

	presence = empathy_contact_get_presence (contact);
	return empathy_icon_name_for_presence (presence);
}

const gchar *
empathy_protocol_name_for_contact (EmpathyContact   *contact)
{
	TpAccount     *account;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact), NULL);

	account = empathy_contact_get_account (contact);
	if (account == NULL) {
		return NULL;
	}

	return tp_account_get_icon_name (account);
}

GdkPixbuf *
empathy_pixbuf_from_data (gchar *data,
			  gsize  data_size)
{
	return empathy_pixbuf_from_data_and_mime (data, data_size, NULL);
}

GdkPixbuf *
empathy_pixbuf_from_data_and_mime (gchar  *data,
				   gsize   data_size,
				   gchar **mime_type)
{
	GdkPixbufLoader *loader;
	GdkPixbufFormat *format;
	GdkPixbuf       *pixbuf = NULL;
	gchar          **mime_types;
	GError          *error = NULL;

	if (!data) {
		return NULL;
	}

	loader = gdk_pixbuf_loader_new ();
	if (!gdk_pixbuf_loader_write (loader, (guchar *) data, data_size, &error)) {
		DEBUG ("Failed to write to pixbuf loader: %s",
			error ? error->message : "No error given");
		goto out;
	}
	if (!gdk_pixbuf_loader_close (loader, &error)) {
		DEBUG ("Failed to close pixbuf loader: %s",
			error ? error->message : "No error given");
		goto out;
	}

	pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
	if (pixbuf) {
		g_object_ref (pixbuf);

		if (mime_type != NULL) {
			format = gdk_pixbuf_loader_get_format (loader);
			mime_types = gdk_pixbuf_format_get_mime_types (format);

			*mime_type = g_strdup (*mime_types);
			if (mime_types[1] != NULL) {
				DEBUG ("Loader supports more than one mime "
					"type! Picking the first one, %s",
					*mime_type);
			}
			g_strfreev (mime_types);
		}
	}

out:
	g_clear_error (&error);
	g_object_unref (loader);

	return pixbuf;
}

struct SizeData {
	gint     width;
	gint     height;
	gboolean preserve_aspect_ratio;
};

static void
pixbuf_from_avatar_size_prepared_cb (GdkPixbufLoader *loader,
				     int              width,
				     int              height,
				     struct SizeData *data)
{
	g_return_if_fail (width > 0 && height > 0);

	if (data->preserve_aspect_ratio && (data->width > 0 || data->height > 0)) {
		if (width < data->width && height < data->height) {
			width = width;
			height = height;
		}

		if (data->width < 0) {
			width = width * (double) data->height / (gdouble) height;
			height = data->height;
		} else if (data->height < 0) {
			height = height * (double) data->width / (double) width;
			width = data->width;
		} else if ((double) height * (double) data->width >
			   (double) width * (double) data->height) {
			width = 0.5 + (double) width * (double) data->height / (double) height;
			height = data->height;
		} else {
			height = 0.5 + (double) height * (double) data->width / (double) width;
			width = data->width;
		}
	} else {
		if (data->width > 0) {
			width = data->width;
		}

		if (data->height > 0) {
			height = data->height;
		}
	}

	gdk_pixbuf_loader_set_size (loader, width, height);
}

static void
empathy_avatar_pixbuf_roundify (GdkPixbuf *pixbuf)
{
	gint width, height, rowstride;
	guchar *pixels;

	width = gdk_pixbuf_get_width (pixbuf);
	height = gdk_pixbuf_get_height (pixbuf);
	rowstride = gdk_pixbuf_get_rowstride (pixbuf);
	pixels = gdk_pixbuf_get_pixels (pixbuf);

	if (width < 6 || height < 6) {
		return;
	}

	/* Top left */
	pixels[3] = 0;
	pixels[7] = 0x80;
	pixels[11] = 0xC0;
	pixels[rowstride + 3] = 0x80;
	pixels[rowstride * 2 + 3] = 0xC0;

	/* Top right */
	pixels[width * 4 - 1] = 0;
	pixels[width * 4 - 5] = 0x80;
	pixels[width * 4 - 9] = 0xC0;
	pixels[rowstride + (width * 4) - 1] = 0x80;
	pixels[(2 * rowstride) + (width * 4) - 1] = 0xC0;

	/* Bottom left */
	pixels[(height - 1) * rowstride + 3] = 0;
	pixels[(height - 1) * rowstride + 7] = 0x80;
	pixels[(height - 1) * rowstride + 11] = 0xC0;
	pixels[(height - 2) * rowstride + 3] = 0x80;
	pixels[(height - 3) * rowstride + 3] = 0xC0;

	/* Bottom right */
	pixels[height * rowstride - 1] = 0;
	pixels[(height - 1) * rowstride - 1] = 0x80;
	pixels[(height - 2) * rowstride - 1] = 0xC0;
	pixels[height * rowstride - 5] = 0x80;
	pixels[height * rowstride - 9] = 0xC0;
}

static gboolean
empathy_gdk_pixbuf_is_opaque (GdkPixbuf *pixbuf)
{
	gint width, height, rowstride, i;
	guchar *pixels;
	guchar *row;

	width = gdk_pixbuf_get_width (pixbuf);
	height = gdk_pixbuf_get_height (pixbuf);
	rowstride = gdk_pixbuf_get_rowstride (pixbuf);
	pixels = gdk_pixbuf_get_pixels (pixbuf);

	row = pixels;
	for (i = 3; i < rowstride; i+=4) {
		if (row[i] < 0xfe) {
			return FALSE;
		}
	}

	for (i = 1; i < height - 1; i++) {
		row = pixels + (i*rowstride);
		if (row[3] < 0xfe || row[rowstride-1] < 0xfe) {
			return FALSE;
		}
	}

	row = pixels + ((height-1) * rowstride);
	for (i = 3; i < rowstride; i+=4) {
		if (row[i] < 0xfe) {
			return FALSE;
		}
	}

	return TRUE;
}

GdkPixbuf *
empathy_pixbuf_from_avatar_scaled (EmpathyAvatar *avatar,
				  gint          width,
				  gint          height)
{
	GdkPixbuf        *pixbuf;
	GdkPixbufLoader	 *loader;
	struct SizeData   data;
	GError           *error = NULL;

	if (!avatar) {
		return NULL;
	}

	data.width = width;
	data.height = height;
	data.preserve_aspect_ratio = TRUE;

	loader = gdk_pixbuf_loader_new ();

	g_signal_connect (loader, "size-prepared",
			  G_CALLBACK (pixbuf_from_avatar_size_prepared_cb),
			  &data);

	if (!gdk_pixbuf_loader_write (loader, avatar->data, avatar->len, &error)) {
		g_warning ("Couldn't write avatar image:%p with "
			   "length:%" G_GSIZE_FORMAT " to pixbuf loader: %s",
			   avatar->data, avatar->len, error->message);
		g_error_free (error);
		return NULL;
	}

	gdk_pixbuf_loader_close (loader, NULL);

	pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
	if (!gdk_pixbuf_get_has_alpha (pixbuf)) {
		GdkPixbuf *rounded_pixbuf;

		rounded_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
						 gdk_pixbuf_get_width (pixbuf),
						 gdk_pixbuf_get_height (pixbuf));
		gdk_pixbuf_copy_area (pixbuf, 0, 0,
				      gdk_pixbuf_get_width (pixbuf),
				      gdk_pixbuf_get_height (pixbuf),
				      rounded_pixbuf,
				      0, 0);
		pixbuf = rounded_pixbuf;
	} else {
		g_object_ref (pixbuf);
	}

	if (empathy_gdk_pixbuf_is_opaque (pixbuf)) {
		empathy_avatar_pixbuf_roundify (pixbuf);
	}

	g_object_unref (loader);

	return pixbuf;
}

GdkPixbuf *
empathy_pixbuf_avatar_from_contact_scaled (EmpathyContact *contact,
					  gint           width,
					  gint           height)
{
	EmpathyAvatar *avatar;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact), NULL);

	avatar = empathy_contact_get_avatar (contact);

	return empathy_pixbuf_from_avatar_scaled (avatar, width, height);
}

GdkPixbuf *
empathy_pixbuf_contact_status_icon (EmpathyContact *contact,
				   gboolean       show_protocol)
{
	const gchar *icon_name;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact), NULL);

	icon_name = empathy_icon_name_for_contact (contact);

	if (icon_name == NULL) {
		return NULL;
	}
	return empathy_pixbuf_contact_status_icon_with_icon_name (contact,
	    icon_name,
	    show_protocol);
}

GdkPixbuf *
empathy_pixbuf_contact_status_icon_with_icon_name (EmpathyContact *contact,
					  const gchar    *icon_name,
					  gboolean       show_protocol)
{
	GdkPixbuf *pix_status;
	GdkPixbuf *pix_protocol;
	gchar     *icon_filename;
	gint       height, width;
	gint       numerator, denominator;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact), NULL);
	g_return_val_if_fail (icon_name != NULL, NULL);

	numerator = 3;
	denominator = 4;

	icon_filename = empathy_filename_from_icon_name (icon_name,
							 GTK_ICON_SIZE_MENU);
	if (icon_filename == NULL) {
		DEBUG ("icon name: %s could not be found\n", icon_name);
		return NULL;
	}

	pix_status = gdk_pixbuf_new_from_file (icon_filename, NULL);

	g_free (icon_filename);

	if (pix_status == NULL) {
		DEBUG ("Could not open icon %s\n", icon_filename);
		return NULL;
	}

	if (!show_protocol)
		return pix_status;

	height = gdk_pixbuf_get_height (pix_status);
	width = gdk_pixbuf_get_width (pix_status);

	pix_protocol = empathy_pixbuf_protocol_from_contact_scaled (contact,
								    width * numerator / denominator,
								    height * numerator / denominator);

	if (pix_protocol == NULL) {
		return pix_status;
	}
	gdk_pixbuf_composite (pix_protocol, pix_status,
	    0, height - height * numerator / denominator,
	    width * numerator / denominator, height * numerator / denominator,
	    0, height - height * numerator / denominator,
	    1, 1,
	    GDK_INTERP_BILINEAR, 255);

	g_object_unref (pix_protocol);

	return pix_status;
}

GdkPixbuf *
empathy_pixbuf_protocol_from_contact_scaled (EmpathyContact *contact,
					  gint           width,
					  gint           height)
{
	TpAccount *account;
	gchar     *filename;
	GdkPixbuf *pixbuf = NULL;

	g_return_val_if_fail (EMPATHY_IS_CONTACT (contact), NULL);

	account = empathy_contact_get_account (contact);
	filename = empathy_filename_from_icon_name (tp_account_get_icon_name (account),
						    GTK_ICON_SIZE_MENU);
	if (filename != NULL) {
		pixbuf = gdk_pixbuf_new_from_file_at_size (filename, width, height, NULL);
		g_free (filename);
	}

	return pixbuf;
}

GdkPixbuf *
empathy_pixbuf_scale_down_if_necessary (GdkPixbuf *pixbuf, gint max_size)
{
	gint      width, height;
	gdouble   factor;

	width = gdk_pixbuf_get_width (pixbuf);
	height = gdk_pixbuf_get_height (pixbuf);

	if (width > 0 && (width > max_size || height > max_size)) {
		factor = (gdouble) max_size / MAX (width, height);

		width = width * factor;
		height = height * factor;

		return gdk_pixbuf_scale_simple (pixbuf,
						width, height,
						GDK_INTERP_HYPER);
	}

	return g_object_ref (pixbuf);
}

GdkPixbuf *
empathy_pixbuf_from_icon_name_sized (const gchar *icon_name,
				     gint size)
{
	GtkIconTheme *theme;
	GdkPixbuf *pixbuf;
	GError *error = NULL;

	if (!icon_name) {
		return NULL;
	}

	theme = gtk_icon_theme_get_default ();

	pixbuf = gtk_icon_theme_load_icon (theme,
					   icon_name,
					   size,
					   0,
					   &error);
	if (error) {
		DEBUG ("Error loading icon: %s", error->message);
		g_clear_error (&error);
	}

	return pixbuf;
}

GdkPixbuf *
empathy_pixbuf_from_icon_name (const gchar *icon_name,
			       GtkIconSize  icon_size)
{
	gint  w, h;
	gint  size = 48;

	if (!icon_name) {
		return NULL;
	}

	if (gtk_icon_size_lookup (icon_size, &w, &h)) {
		size = (w + h) / 2;
	}

	return empathy_pixbuf_from_icon_name_sized (icon_name, size);
}

gchar *
empathy_filename_from_icon_name (const gchar *icon_name,
				 GtkIconSize  icon_size)
{
	GtkIconTheme *icon_theme;
	GtkIconInfo  *icon_info;
	gint          w, h;
	gint          size = 48;
	gchar        *ret;

	icon_theme = gtk_icon_theme_get_default ();

	if (gtk_icon_size_lookup (icon_size, &w, &h)) {
		size = (w + h) / 2;
	}

	icon_info = gtk_icon_theme_lookup_icon (icon_theme, icon_name, size, 0);
	ret = g_strdup (gtk_icon_info_get_filename (icon_info));
	gtk_icon_info_free (icon_info);

	return ret;
}

/* Stolen from GtkSourceView, hence the weird intendation. Please keep it like
 * that to make it easier to apply changes from the original code.
 */
#define GTK_TEXT_UNKNOWN_CHAR 0xFFFC

/* this function acts like g_utf8_offset_to_pointer() except that if it finds a
 * decomposable character it consumes the decomposition length from the given
 * offset.  So it's useful when the offset was calculated for the normalized
 * version of str, but we need a pointer to str itself. */
static const gchar *
pointer_from_offset_skipping_decomp (const gchar *str, gint offset)
{
	gchar *casefold, *normal;
	const gchar *p, *q;

	p = str;
	while (offset > 0)
	{
		q = g_utf8_next_char (p);
		casefold = g_utf8_casefold (p, q - p);
		normal = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
		offset -= g_utf8_strlen (normal, -1);
		g_free (casefold);
		g_free (normal);
		p = q;
	}
	return p;
}

static const gchar *
g_utf8_strcasestr (const gchar *haystack, const gchar *needle)
{
	gsize needle_len;
	gsize haystack_len;
	const gchar *ret = NULL;
	gchar *p;
	gchar *casefold;
	gchar *caseless_haystack;
	gint i;

	g_return_val_if_fail (haystack != NULL, NULL);
	g_return_val_if_fail (needle != NULL, NULL);

	casefold = g_utf8_casefold (haystack, -1);
	caseless_haystack = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
	g_free (casefold);

	needle_len = g_utf8_strlen (needle, -1);
	haystack_len = g_utf8_strlen (caseless_haystack, -1);

	if (needle_len == 0)
	{
		ret = (gchar *) haystack;
		goto finally_1;
	}

	if (haystack_len < needle_len)
	{
		ret = NULL;
		goto finally_1;
	}

	p = (gchar *) caseless_haystack;
	needle_len = strlen (needle);
	i = 0;

	while (*p)
	{
		if ((strncmp (p, needle, needle_len) == 0))
		{
			ret = pointer_from_offset_skipping_decomp (haystack, i);
			goto finally_1;
		}

		p = g_utf8_next_char (p);
		i++;
	}

finally_1:
	g_free (caseless_haystack);

	return ret;
}

static gboolean
g_utf8_caselessnmatch (const char *s1, const char *s2,
		       gssize n1, gssize n2)
{
	gchar *casefold;
	gchar *normalized_s1;
	gchar *normalized_s2;
	gint len_s1;
	gint len_s2;
	gboolean ret = FALSE;

	g_return_val_if_fail (s1 != NULL, FALSE);
	g_return_val_if_fail (s2 != NULL, FALSE);
	g_return_val_if_fail (n1 > 0, FALSE);
	g_return_val_if_fail (n2 > 0, FALSE);

	casefold = g_utf8_casefold (s1, n1);
	normalized_s1 = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
	g_free (casefold);

	casefold = g_utf8_casefold (s2, n2);
	normalized_s2 = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
	g_free (casefold);

	len_s1 = strlen (normalized_s1);
	len_s2 = strlen (normalized_s2);

	if (len_s1 < len_s2)
		goto finally_2;

	ret = (strncmp (normalized_s1, normalized_s2, len_s2) == 0);

finally_2:
	g_free (normalized_s1);
	g_free (normalized_s2);

	return ret;
}

static void
forward_chars_with_skipping (GtkTextIter *iter,
			     gint         count,
			     gboolean     skip_invisible,
			     gboolean     skip_nontext,
			     gboolean     skip_decomp)
{
	gint i;

	g_return_if_fail (count >= 0);

	i = count;

	while (i > 0)
	{
		gboolean ignored = FALSE;

		/* minimal workaround to avoid the infinite loop of bug #168247.
		 * It doesn't fix the problemjust the symptom...
		 */
		if (gtk_text_iter_is_end (iter))
			return;

		if (skip_nontext && gtk_text_iter_get_char (iter) == GTK_TEXT_UNKNOWN_CHAR)
			ignored = TRUE;

		if (!ignored && skip_invisible &&
		    /* _gtk_text_btree_char_is_invisible (iter)*/ FALSE)
			ignored = TRUE;

		if (!ignored && skip_decomp)
		{
			/* being UTF8 correct sucks; this accounts for extra
			   offsets coming from canonical decompositions of
			   UTF8 characters (e.g. accented characters) which
			   g_utf8_normalize () performs */
			gchar *normal;
			gchar buffer[6];
			gint buffer_len;

			buffer_len = g_unichar_to_utf8 (gtk_text_iter_get_char (iter), buffer);
			normal = g_utf8_normalize (buffer, buffer_len, G_NORMALIZE_NFD);
			i -= (g_utf8_strlen (normal, -1) - 1);
			g_free (normal);
		}

		gtk_text_iter_forward_char (iter);

		if (!ignored)
			--i;
	}
}

static gboolean
lines_match (const GtkTextIter *start,
	     const gchar      **lines,
	     gboolean           visible_only,
	     gboolean           slice,
	     GtkTextIter       *match_start,
	     GtkTextIter       *match_end)
{
	GtkTextIter next;
	gchar *line_text;
	const gchar *found;
	gint offset;

	if (*lines == NULL || **lines == '\0')
	{
		if (match_start)
			*match_start = *start;
		if (match_end)
			*match_end = *start;
		return TRUE;
	}

	next = *start;
	gtk_text_iter_forward_line (&next);

	/* No more text in buffer, but *lines is nonempty */
	if (gtk_text_iter_equal (start, &next))
		return FALSE;

	if (slice)
	{
		if (visible_only)
			line_text = gtk_text_iter_get_visible_slice (start, &next);
		else
			line_text = gtk_text_iter_get_slice (start, &next);
	}
	else
	{
		if (visible_only)
			line_text = gtk_text_iter_get_visible_text (start, &next);
		else
			line_text = gtk_text_iter_get_text (start, &next);
	}

	if (match_start) /* if this is the first line we're matching */
	{
		found = g_utf8_strcasestr (line_text, *lines);
	}
	else
	{
		/* If it's not the first line, we have to match from the
		 * start of the line.
		 */
		if (g_utf8_caselessnmatch (line_text, *lines, strlen (line_text),
					   strlen (*lines)))
			found = line_text;
		else
			found = NULL;
	}

	if (found == NULL)
	{
		g_free (line_text);
		return FALSE;
	}

	/* Get offset to start of search string */
	offset = g_utf8_strlen (line_text, found - line_text);

	next = *start;

	/* If match start needs to be returned, set it to the
	 * start of the search string.
	 */
	forward_chars_with_skipping (&next, offset, visible_only, !slice, FALSE);
	if (match_start)
	{
		*match_start = next;
	}

	/* Go to end of search string */
	forward_chars_with_skipping (&next, g_utf8_strlen (*lines, -1), visible_only, !slice, TRUE);

	g_free (line_text);

	++lines;

	if (match_end)
		*match_end = next;

	/* pass NULL for match_start, since we don't need to find the
	 * start again.
	 */
	return lines_match (&next, lines, visible_only, slice, NULL, match_end);
}

/* strsplit () that retains the delimiter as part of the string. */
static gchar **
strbreakup (const char *string,
	    const char *delimiter,
	    gint        max_tokens)
{
	GSList *string_list = NULL, *slist;
	gchar **str_array, *s, *casefold, *new_string;
	guint i, n = 1;

	g_return_val_if_fail (string != NULL, NULL);
	g_return_val_if_fail (delimiter != NULL, NULL);

	if (max_tokens < 1)
		max_tokens = G_MAXINT;

	s = strstr (string, delimiter);
	if (s)
	{
		guint delimiter_len = strlen (delimiter);

		do
		{
			guint len;

			len = s - string + delimiter_len;
			new_string = g_new (gchar, len + 1);
			strncpy (new_string, string, len);
			new_string[len] = 0;
			casefold = g_utf8_casefold (new_string, -1);
			g_free (new_string);
			new_string = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
			g_free (casefold);
			string_list = g_slist_prepend (string_list, new_string);
			n++;
			string = s + delimiter_len;
			s = strstr (string, delimiter);
		} while (--max_tokens && s);
	}

	if (*string)
	{
		n++;
		casefold = g_utf8_casefold (string, -1);
		new_string = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
		g_free (casefold);
		string_list = g_slist_prepend (string_list, new_string);
	}

	str_array = g_new (gchar*, n);

	i = n - 1;

	str_array[i--] = NULL;
	for (slist = string_list; slist; slist = slist->next)
		str_array[i--] = slist->data;

	g_slist_free (string_list);

	return str_array;
}

gboolean
empathy_text_iter_forward_search (const GtkTextIter   *iter,
				 const gchar         *str,
				 GtkTextIter         *match_start,
				 GtkTextIter         *match_end,
				 const GtkTextIter   *limit)
{
	gchar **lines = NULL;
	GtkTextIter match;
	gboolean retval = FALSE;
	GtkTextIter search;
	gboolean visible_only;
	gboolean slice;

	g_return_val_if_fail (iter != NULL, FALSE);
	g_return_val_if_fail (str != NULL, FALSE);

	if (limit && gtk_text_iter_compare (iter, limit) >= 0)
		return FALSE;

	if (*str == '\0') {
		/* If we can move one char, return the empty string there */
		match = *iter;

		if (gtk_text_iter_forward_char (&match)) {
			if (limit && gtk_text_iter_equal (&match, limit)) {
				return FALSE;
			}

			if (match_start) {
				*match_start = match;
			}
			if (match_end) {
				*match_end = match;
			}
			return TRUE;
		} else {
			return FALSE;
		}
	}

	visible_only = TRUE;
	slice = FALSE;

	/* locate all lines */
	lines = strbreakup (str, "\n", -1);

	search = *iter;

	do {
		/* This loop has an inefficient worst-case, where
		 * gtk_text_iter_get_text () is called repeatedly on
		 * a single line.
		 */
		GtkTextIter end;

		if (limit && gtk_text_iter_compare (&search, limit) >= 0) {
			break;
		}

		if (lines_match (&search, (const gchar**)lines,
				 visible_only, slice, &match, &end)) {
			if (limit == NULL ||
			    (limit && gtk_text_iter_compare (&end, limit) <= 0)) {
				retval = TRUE;

				if (match_start) {
					*match_start = match;
				}
				if (match_end) {
					*match_end = end;
				}
			}
			break;
		}
	} while (gtk_text_iter_forward_line (&search));

	g_strfreev ((gchar **) lines);

	return retval;
}

static const gchar *
g_utf8_strrcasestr (const gchar *haystack, const gchar *needle)
{
	gsize needle_len;
	gsize haystack_len;
	const gchar *ret = NULL;
	gchar *p;
	gchar *casefold;
	gchar *caseless_haystack;
	gint i;

	g_return_val_if_fail (haystack != NULL, NULL);
	g_return_val_if_fail (needle != NULL, NULL);

	casefold = g_utf8_casefold (haystack, -1);
	caseless_haystack = g_utf8_normalize (casefold, -1, G_NORMALIZE_NFD);
	g_free (casefold);

	needle_len = g_utf8_strlen (needle, -1);
	haystack_len = g_utf8_strlen (caseless_haystack, -1);

	if (needle_len == 0)
	{
		ret = (gchar *) haystack;
		goto finally_1;
	}

	if (haystack_len < needle_len)
	{
		ret = NULL;
		goto finally_1;
	}

	i = haystack_len - needle_len;
	p = g_utf8_offset_to_pointer (caseless_haystack, i);
	needle_len = strlen (needle);

	while (p >= caseless_haystack)
	{
		if (strncmp (p, needle, needle_len) == 0)
		{
			ret = pointer_from_offset_skipping_decomp (haystack, i);
			goto finally_1;
		}

		p = g_utf8_prev_char (p);
		i--;
	}

finally_1:
	g_free (caseless_haystack);

	return ret;
}

static gboolean
backward_lines_match (const GtkTextIter *start,
		      const gchar      **lines,
		      gboolean           visible_only,
		      gboolean           slice,
		      GtkTextIter       *match_start,
		      GtkTextIter       *match_end)
{
	GtkTextIter line, next;
	gchar *line_text;
	const gchar *found;
	gint offset;

	if (*lines == NULL || **lines == '\0')
	{
		if (match_start)
			*match_start = *start;
		if (match_end)
			*match_end = *start;
		return TRUE;
	}

	line = next = *start;
	if (gtk_text_iter_get_line_offset (&next) == 0)
	{
		if (!gtk_text_iter_backward_line (&next))
			return FALSE;
	}
	else
		gtk_text_iter_set_line_offset (&next, 0);

	if (slice)
	{
		if (visible_only)
			line_text = gtk_text_iter_get_visible_slice (&next, &line);
		else
			line_text = gtk_text_iter_get_slice (&next, &line);
	}
	else
	{
		if (visible_only)
			line_text = gtk_text_iter_get_visible_text (&next, &line);
		else
			line_text = gtk_text_iter_get_text (&next, &line);
	}

	if (match_start) /* if this is the first line we're matching */
	{
		found = g_utf8_strrcasestr (line_text, *lines);
	}
	else
	{
		/* If it's not the first line, we have to match from the
		 * start of the line.
		 */
		if (g_utf8_caselessnmatch (line_text, *lines, strlen (line_text),
					   strlen (*lines)))
			found = line_text;
		else
			found = NULL;
	}

	if (found == NULL)
	{
		g_free (line_text);
		return FALSE;
	}

	/* Get offset to start of search string */
	offset = g_utf8_strlen (line_text, found - line_text);

	forward_chars_with_skipping (&next, offset, visible_only, !slice, FALSE);

	/* If match start needs to be returned, set it to the
	 * start of the search string.
	 */
	if (match_start)
	{
		*match_start = next;
	}

	/* Go to end of search string */
	forward_chars_with_skipping (&next, g_utf8_strlen (*lines, -1), visible_only, !slice, TRUE);

	g_free (line_text);

	++lines;

	if (match_end)
		*match_end = next;

	/* try to match the rest of the lines forward, passing NULL
	 * for match_start so lines_match will try to match the entire
	 * line */
	return lines_match (&next, lines, visible_only,
			    slice, NULL, match_end);
}

gboolean
empathy_text_iter_backward_search (const GtkTextIter   *iter,
				  const gchar         *str,
				  GtkTextIter         *match_start,
				  GtkTextIter         *match_end,
				  const GtkTextIter   *limit)
{
	gchar **lines = NULL;
	GtkTextIter match;
	gboolean retval = FALSE;
	GtkTextIter search;
	gboolean visible_only;
	gboolean slice;

	g_return_val_if_fail (iter != NULL, FALSE);
	g_return_val_if_fail (str != NULL, FALSE);

	if (limit && gtk_text_iter_compare (iter, limit) <= 0)
		return FALSE;

	if (*str == '\0')
	{
		/* If we can move one char, return the empty string there */
		match = *iter;

		if (gtk_text_iter_backward_char (&match))
		{
			if (limit && gtk_text_iter_equal (&match, limit))
				return FALSE;

			if (match_start)
				*match_start = match;
			if (match_end)
				*match_end = match;
			return TRUE;
		}
		else
		{
			return FALSE;
		}
	}

	visible_only = TRUE;
	slice = TRUE;

	/* locate all lines */
	lines = strbreakup (str, "\n", -1);

	search = *iter;

	while (TRUE)
	{
		/* This loop has an inefficient worst-case, where
		 * gtk_text_iter_get_text () is called repeatedly on
		 * a single line.
		 */
		GtkTextIter end;

		if (limit && gtk_text_iter_compare (&search, limit) <= 0)
			break;

		if (backward_lines_match (&search, (const gchar**)lines,
					  visible_only, slice, &match, &end))
		{
			if (limit == NULL || (limit &&
					      gtk_text_iter_compare (&end, limit) > 0))
			{
				retval = TRUE;

				if (match_start)
					*match_start = match;
				if (match_end)
					*match_end = end;
			}
			break;
		}

		if (gtk_text_iter_get_line_offset (&search) == 0)
		{
			if (!gtk_text_iter_backward_line (&search))
				break;
		}
		else
		{
			gtk_text_iter_set_line_offset (&search, 0);
		}
	}

	g_strfreev ((gchar **) lines);

	return retval;
}

gboolean
empathy_window_get_is_visible (GtkWindow *window)
{
	GdkWindowState  state;
	GdkWindow      *gdk_window;

	g_return_val_if_fail (GTK_IS_WINDOW (window), FALSE);

	gdk_window = gtk_widget_get_window (GTK_WIDGET (window));
	if (!gdk_window) {
		return FALSE;
	}

	state = gdk_window_get_state (gdk_window);
	if (state & (GDK_WINDOW_STATE_WITHDRAWN | GDK_WINDOW_STATE_ICONIFIED)) {
		return FALSE;
	}

	return TRUE;
}

void
empathy_window_iconify (GtkWindow *window, GtkStatusIcon *status_icon)
{
	GdkRectangle  icon_location;
	gulong        data[4];
	Display      *dpy;
	GdkWindow    *gdk_window;

	gtk_status_icon_get_geometry (status_icon, NULL, &icon_location, NULL);
	gdk_window = gtk_widget_get_window (GTK_WIDGET (window));
	dpy = gdk_x11_drawable_get_xdisplay (gdk_window);

	data[0] = icon_location.x;
	data[1] = icon_location.y;
	data[2] = icon_location.width;
	data[3] = icon_location.height;

	XChangeProperty (dpy,
			 GDK_WINDOW_XID (gdk_window),
			 gdk_x11_get_xatom_by_name_for_display (
				gdk_drawable_get_display (gdk_window),
			 "_NET_WM_ICON_GEOMETRY"),
			 XA_CARDINAL, 32, PropModeReplace,
			 (guchar *)&data, 4);

	gtk_window_set_skip_taskbar_hint (window, TRUE);
	gtk_window_iconify (window);
}

/* Takes care of moving the window to the current workspace. */
void
empathy_window_present (GtkWindow *window)
{
	GdkWindow *gdk_window;
	guint32 timestamp;

	g_return_if_fail (GTK_IS_WINDOW (window));

	/* Move the window to the current workspace before trying to show it.
	 * This is the behaviour people expect when clicking on the statusbar icon. */
	gdk_window = gtk_widget_get_window (GTK_WIDGET (window));
	if (gdk_window) {
		gint x, y;
		gint w, h;

		/* Has no effect if the WM has viewports, like compiz */
		gdk_x11_window_move_to_current_desktop (gdk_window);

		/* If window is still off-screen, hide it to force it to
		 * reposition on the current workspace. */
		gtk_window_get_position (window, &x, &y);
		gtk_window_get_size (window, &w, &h);
		if (!EMPATHY_RECT_IS_ON_SCREEN (x, y, w, h))
			gtk_widget_hide (GTK_WIDGET (window));
	}

	timestamp = gtk_get_current_event_time ();
	if (timestamp == 0 && gdk_window != NULL) {
		GdkEventMask mask;

		/* According to the documentation of gdk_x11_get_server_time
		 * GDK_PROPERTY_CHANGE_MASK needs to be set in its events otherwise a hang
		 * can occur. Be sure to at least temporarily set this mask */
		mask = gdk_window_get_events (gdk_window);
		gdk_window_set_events (gdk_window,
			mask | GDK_PROPERTY_CHANGE_MASK);
		timestamp = gdk_x11_get_server_time (gdk_window);
		gdk_window_set_events (gdk_window, mask);
	}

	gtk_window_present_with_time (window, timestamp);
	gtk_window_set_skip_taskbar_hint (window, FALSE);
	gtk_window_deiconify (window);
}

GtkWindow *
empathy_get_toplevel_window (GtkWidget *widget)
{
	GtkWidget *toplevel;

	g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);

	toplevel = gtk_widget_get_toplevel (widget);
	if (GTK_IS_WINDOW (toplevel) &&
	    gtk_widget_is_toplevel (toplevel)) {
		return GTK_WINDOW (toplevel);
	}

	return NULL;
}

/** empathy_make_absolute_url_len:
 * @url: an url
 * @len: a length
 *
 * Same as #empathy_make_absolute_url but for a limited string length
 */
gchar *
empathy_make_absolute_url_len (const gchar *url,
			       guint len)
{
	g_return_val_if_fail (url != NULL, NULL);

	if (g_str_has_prefix (url, "ghelp:") ||
	    g_str_has_prefix (url, "mailto:") ||
	    strstr (url, ":/")) {
		return g_strndup (url, len);
	}

	if (strstr (url, "@")) {
		return g_strdup_printf ("mailto:%.*s", len, url);
	}

	return g_strdup_printf ("http://%.*s", len, url);
}

/** empathy_make_absolute_url:
 * @url: an url
 *
 * The URL opening code can't handle schemeless strings, so we try to be
 * smart and add http if there is no scheme or doesn't look like a mail
 * address. This should work in most cases, and let us click on strings
 * like "www.gnome.org".
 *
 * Returns: a newly allocated url with proper mailto: or http:// prefix, use
 * g_free when your are done with it
 */
gchar *
empathy_make_absolute_url (const gchar *url)
{
	return empathy_make_absolute_url_len (url, strlen (url));
}

void
empathy_url_show (GtkWidget *parent,
		  const char *url)
{
	gchar  *real_url;
	GError *error = NULL;

	g_return_if_fail (parent == NULL || GTK_IS_WIDGET (parent));
	g_return_if_fail (url != NULL);

	real_url = empathy_make_absolute_url (url);

	gtk_show_uri (parent ? gtk_widget_get_screen (parent) : NULL, real_url,
		      gtk_get_current_event_time (), &error);

	if (error) {
		GtkWidget *dialog;

		dialog = gtk_message_dialog_new (NULL, 0,
						 GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE,
						 _("Unable to open URI"));
		gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
							  "%s", error->message);

		g_signal_connect (dialog, "response",
				  G_CALLBACK (gtk_widget_destroy),
				  NULL);
		gtk_window_present (GTK_WINDOW (dialog));

		g_clear_error (&error);
	}

	g_free (real_url);
}

static void
link_button_hook (GtkLinkButton *button,
		  const gchar *link,
		  gpointer user_data)
{
	empathy_url_show (GTK_WIDGET (button), link);
}

GtkWidget *
empathy_link_button_new (const gchar *url,
			const gchar *title)
{
	static gboolean hook = FALSE;

	if (!hook) {
		hook = TRUE;
		gtk_link_button_set_uri_hook (link_button_hook, NULL, NULL);
	}

	return gtk_link_button_new_with_label (url, title);
}

void
empathy_send_file (EmpathyContact *contact, GFile *file)
{
	EmpathyFTFactory *factory;
	GtkRecentManager *manager;
	gchar *uri;

	g_return_if_fail (EMPATHY_IS_CONTACT (contact));
	g_return_if_fail (G_IS_FILE (file));

	factory = empathy_ft_factory_dup_singleton ();

	empathy_ft_factory_new_transfer_outgoing (factory, contact, file);

	uri = g_file_get_uri (file);
	manager = gtk_recent_manager_get_default ();
	gtk_recent_manager_add_item (manager, uri);
	g_free (uri);

	g_object_unref (factory);
}

void
empathy_send_file_from_uri_list (EmpathyContact *contact, const gchar *uri_list)
{
	const gchar *nl;
	GFile *file;

	/* Only handle a single file for now.  It would be wicked cool to be
	   able to do multiple files, offering to zip them or whatever like
	   nautilus-sendto does.  Note that text/uri-list is defined to have
	   each line terminated by \r\n, but we can be tolerant of applications
	   that only use \n or don't terminate single-line entries.
	*/
	nl = strstr (uri_list, "\r\n");
	if (!nl) {
		nl = strchr (uri_list, '\n');
	}
	if (nl) {
		gchar *uri = g_strndup (uri_list, nl - uri_list);
		file = g_file_new_for_uri (uri);
		g_free (uri);
	}
	else {
		file = g_file_new_for_uri (uri_list);
	}

	empathy_send_file (contact, file);

	g_object_unref (file);
}

static void
file_manager_send_file_response_cb (GtkDialog      *widget,
				    gint            response_id,
				    EmpathyContact *contact)
{
	GFile *file;

	if (response_id == GTK_RESPONSE_OK) {
		file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (widget));

		empathy_send_file (contact, file);

		g_object_unref (file);
	}

	gtk_widget_destroy (GTK_WIDGET (widget));
}

void
empathy_send_file_with_file_chooser (EmpathyContact *contact)
{
	GtkWidget               *widget;
	GtkWidget               *button;

	g_return_if_fail (EMPATHY_IS_CONTACT (contact));

	DEBUG ("Creating selection file chooser");

	widget = gtk_file_chooser_dialog_new (_("Select a file"),
					      NULL,
					      GTK_FILE_CHOOSER_ACTION_OPEN,
					      GTK_STOCK_CANCEL,
					      GTK_RESPONSE_CANCEL,
					      NULL);

	/* send button */
	button = gtk_button_new_with_mnemonic (_("_Send"));
	gtk_button_set_image (GTK_BUTTON (button),
		gtk_image_new_from_icon_name (EMPATHY_IMAGE_DOCUMENT_SEND,
					      GTK_ICON_SIZE_BUTTON));
	gtk_widget_show (button);
	gtk_dialog_add_action_widget (GTK_DIALOG (widget), button,
				      GTK_RESPONSE_OK);
	gtk_widget_set_can_default (button, TRUE);
	gtk_dialog_set_default_response (GTK_DIALOG (widget),
					 GTK_RESPONSE_OK);

	gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (widget), FALSE);

	gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (widget),
		g_get_home_dir ());

	g_signal_connect (widget, "response",
			  G_CALLBACK (file_manager_send_file_response_cb),
			  contact);

	gtk_widget_show (widget);
}

static void
file_manager_receive_file_response_cb (GtkDialog *dialog,
				       GtkResponseType response,
				       EmpathyFTHandler *handler)
{
	EmpathyFTFactory *factory;
	GFile *file;

	if (response == GTK_RESPONSE_OK) {
		factory = empathy_ft_factory_dup_singleton ();
		file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog));

		empathy_ft_factory_set_destination_for_incoming_handler
			(factory, handler, file);

		g_object_unref (factory);
		g_object_unref (file);
	} else {
		/* unref the handler, as we dismissed the file chooser,
		 * and refused the transfer.
		 */
		g_object_unref (handler);
	}

	gtk_widget_destroy (GTK_WIDGET (dialog));
}

void
empathy_receive_file_with_file_chooser (EmpathyFTHandler *handler)
{
	GtkWidget *widget;
	const gchar *dir;

	widget = gtk_file_chooser_dialog_new (_("Select a destination"),
					      NULL,
					      GTK_FILE_CHOOSER_ACTION_SAVE,
					      GTK_STOCK_CANCEL,
					      GTK_RESPONSE_CANCEL,
					      GTK_STOCK_SAVE,
					      GTK_RESPONSE_OK,
					      NULL);
	gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (widget),
		empathy_ft_handler_get_filename (handler));
	gtk_file_chooser_set_do_overwrite_confirmation
		(GTK_FILE_CHOOSER (widget), TRUE);

	dir = g_get_user_special_dir (G_USER_DIRECTORY_DOWNLOAD);
	if (dir == NULL)
		/* Fallback to $HOME if $XDG_DOWNLOAD_DIR is not set */
		dir = g_get_home_dir ();

	gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (widget), dir);

	g_signal_connect (widget, "response",
		G_CALLBACK (file_manager_receive_file_response_cb), handler);

	gtk_widget_show (widget);
}

