/* pidgin
 *
 * Pidgin is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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 Street, Fifth Floor, Boston, MA  02111-1301  USA
 */

#include <glib/gi18n-lib.h>

#include <gtk/gtk.h>

#include <purple.h>

#include "gtkxfer.h"
#include "gtkutils.h"
#include "pidgincore.h"

#ifdef _WIN32
#  include <shellapi.h>
#endif

/* the maximum size of files we will try to make a thumbnail for */
#define PIDGIN_XFER_MAX_SIZE_IMAGE_THUMBNAIL 10 * 1024 * 1024

struct _PidginXferDialog
{
	GtkDialog parent;

	GtkWidget *keep_open;
	GtkWidget *auto_clear;

	PurpleXfer *selected_xfer;

	GtkWidget *tree;
	GtkListStore *model;

	GtkWidget *expander;

	GtkWidget *local_user_desc_label;
	GtkWidget *local_user_label;
	GtkWidget *remote_user_desc_label;
	GtkWidget *remote_user_label;
	GtkWidget *protocol_label;
	GtkWidget *filename_label;
	GtkWidget *localfile_label;
	GtkWidget *status_label;
	GtkWidget *speed_label;
	GtkWidget *time_elapsed_label;
	GtkWidget *time_remaining_label;

	GtkWidget *progress;

	/* Buttons */
	GtkWidget *open_button;
	GtkWidget *remove_button;
	GtkWidget *stop_button;
	GtkWidget *close_button;
};

G_DEFINE_TYPE(PidginXferDialog, pidgin_xfer_dialog, GTK_TYPE_DIALOG);

#define UI_DATA "pidgin-ui-data"
typedef struct
{
	GtkTreeIter iter;
	gint64 last_updated_time;
} PidginXferUiData;

static PidginXferDialog *xfer_dialog = NULL;

enum
{
	COLUMN_STATUS = 0,
	COLUMN_PROGRESS,
	COLUMN_FILENAME,
	COLUMN_SIZE,
	COLUMN_REMAINING,
	COLUMN_XFER,
	NUM_COLUMNS
};

/**************************************************************************
 * Utility Functions
 **************************************************************************/
static void
get_xfer_info_strings(PurpleXfer *xfer, char **kbsec, char **time_elapsed,
					  char **time_remaining)
{
	double kb_sent, kb_rem;
	double kbps = 0.0;
	gint64 now;
	gint64 elapsed = 0;

	elapsed = purple_xfer_get_start_time(xfer);
	if (elapsed > 0) {
		now = purple_xfer_get_end_time(xfer);
		if (now == 0) {
			now = g_get_monotonic_time();
		}
		elapsed = now - elapsed;
	}

	kb_sent = purple_xfer_get_bytes_sent(xfer) / 1000.0;
	kb_rem  = purple_xfer_get_bytes_remaining(xfer) / 1000.0;
	kbps = (elapsed > 0 ? (kb_sent * G_USEC_PER_SEC) / elapsed : 0);

	if (kbsec != NULL) {
		*kbsec = g_strdup_printf(_("%.2f KB/s"), kbps);
	}

	if (time_elapsed != NULL)
	{
		int h, m, s;
		int secs_elapsed;

		if (purple_xfer_get_start_time(xfer) > 0) {
			secs_elapsed = elapsed / G_USEC_PER_SEC;

			h = secs_elapsed / 3600;
			m = (secs_elapsed % 3600) / 60;
			s = secs_elapsed % 60;

			*time_elapsed = g_strdup_printf("%d:%02d:%02d", h, m, s);
		} else {
			*time_elapsed = g_strdup(_("Not started"));
		}
	}

	if (time_remaining != NULL) {
		if (purple_xfer_is_completed(xfer)) {
			*time_remaining = g_strdup(_("Finished"));
		}
		else if (purple_xfer_is_cancelled(xfer)) {
			*time_remaining = g_strdup(_("Cancelled"));
		}
		else if (purple_xfer_get_size(xfer) == 0 || (kb_sent > 0 && kbps < 0.001)) {
			*time_remaining = g_strdup(_("Unknown"));
		}
		else if (kb_sent <= 0) {
			*time_remaining = g_strdup(_("Waiting for transfer to begin"));
		}
		else {
			int h, m, s;
			int secs_remaining;

			secs_remaining = (int)(kb_rem / kbps);

			h = secs_remaining / 3600;
			m = (secs_remaining % 3600) / 60;
			s = secs_remaining % 60;

			*time_remaining = g_strdup_printf("%d:%02d:%02d", h, m, s);
		}
	}
}

static void
update_title_progress(PidginXferDialog *dialog)
{
	gboolean valid;
	GtkTreeIter iter;
	int num_active_xfers = 0;
	guint64 total_bytes_xferred = 0;
	guint64 total_file_size = 0;

	valid = gtk_tree_model_get_iter_first(GTK_TREE_MODEL(dialog->model), &iter);

	/* Find all active transfers */
	while (valid) {
		GValue val;
		PurpleXfer *xfer = NULL;

		val.g_type = 0;
		gtk_tree_model_get_value(GTK_TREE_MODEL(dialog->model), &iter,
		                         COLUMN_XFER, &val);
		xfer = g_value_get_object(&val);

		if (purple_xfer_get_status(xfer) == PURPLE_XFER_STATUS_STARTED) {
			num_active_xfers++;
			total_bytes_xferred += purple_xfer_get_bytes_sent(xfer);
			total_file_size += purple_xfer_get_size(xfer);
		}

		valid = gtk_tree_model_iter_next(GTK_TREE_MODEL(dialog->model), &iter);
	}

	/* Update the title */
	if (num_active_xfers > 0)
	{
		gchar *title;
		int total_pct = 0;

		if (total_file_size > 0) {
			total_pct = 100 * total_bytes_xferred / total_file_size;
		}

		title = g_strdup_printf(ngettext("File Transfers - %d%% of %d file",
						 "File Transfers - %d%% of %d files",
						 num_active_xfers),
					total_pct, num_active_xfers);
		gtk_window_set_title(GTK_WINDOW(dialog), title);
		g_free(title);
	} else {
		gtk_window_set_title(GTK_WINDOW(dialog), _("File Transfers"));
	}
}

static void
update_detailed_info(PidginXferDialog *dialog, PurpleXfer *xfer)
{
	PurpleAccount *account = NULL;
	PurpleContactInfo *info = NULL;
	PidginXferUiData *data;
	char *kbsec, *time_elapsed, *time_remaining;
	char *status, *utf8;

	if (dialog == NULL || xfer == NULL)
		return;

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);

	get_xfer_info_strings(xfer, &kbsec, &time_elapsed, &time_remaining);

	status = g_strdup_printf("%d%% (%" G_GOFFSET_FORMAT " of %" G_GOFFSET_FORMAT " bytes)",
							 (int)(purple_xfer_get_progress(xfer)*100),
							 purple_xfer_get_bytes_sent(xfer),
							 purple_xfer_get_size(xfer));

	if (purple_xfer_is_completed(xfer)) {
		gtk_list_store_set(GTK_LIST_STORE(xfer_dialog->model), &data->iter,
						   COLUMN_STATUS, NULL,
						   -1);
	}

	if (purple_xfer_get_xfer_type(xfer) == PURPLE_XFER_TYPE_RECEIVE) {
		gtk_label_set_markup(GTK_LABEL(dialog->local_user_desc_label),
							 _("<b>Receiving As:</b>"));
		gtk_label_set_markup(GTK_LABEL(dialog->remote_user_desc_label),
							 _("<b>Receiving From:</b>"));
	}
	else {
		gtk_label_set_markup(GTK_LABEL(dialog->remote_user_desc_label),
							 _("<b>Sending To:</b>"));
		gtk_label_set_markup(GTK_LABEL(dialog->local_user_desc_label),
							 _("<b>Sending As:</b>"));
	}

	account = purple_xfer_get_account(xfer);
	info = PURPLE_CONTACT_INFO(account);

	gtk_label_set_text(GTK_LABEL(dialog->local_user_label),
	                   purple_contact_info_get_username(info));
	gtk_label_set_text(GTK_LABEL(dialog->remote_user_label),
	                   purple_xfer_get_remote_user(xfer));
	gtk_label_set_text(GTK_LABEL(dialog->protocol_label),
	                   purple_account_get_protocol_name(account));

	if (purple_xfer_get_xfer_type(xfer) == PURPLE_XFER_TYPE_RECEIVE) {
		gtk_label_set_text(GTK_LABEL(dialog->filename_label),
					   purple_xfer_get_filename(xfer));
	} else {
		char *tmp;

		tmp = g_path_get_basename(purple_xfer_get_local_filename(xfer));
		utf8 = g_filename_to_utf8(tmp, -1, NULL, NULL, NULL);
		g_free(tmp);

		gtk_label_set_text(GTK_LABEL(dialog->filename_label), utf8);
		g_free(utf8);
	}

	utf8 = g_filename_to_utf8((purple_xfer_get_local_filename(xfer)), -1, NULL, NULL, NULL);
	gtk_label_set_text(GTK_LABEL(dialog->localfile_label), utf8);
	g_free(utf8);

	gtk_label_set_text(GTK_LABEL(dialog->status_label), status);

	gtk_label_set_text(GTK_LABEL(dialog->speed_label), kbsec);
	gtk_label_set_text(GTK_LABEL(dialog->time_elapsed_label), time_elapsed);
	gtk_label_set_text(GTK_LABEL(dialog->time_remaining_label),
					   time_remaining);

	gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(dialog->progress),
								  purple_xfer_get_progress(xfer));

	g_free(kbsec);
	g_free(time_elapsed);
	g_free(time_remaining);
	g_free(status);
}

static void
update_buttons(PidginXferDialog *dialog, PurpleXfer *xfer)
{
	if (dialog->selected_xfer == NULL) {
		gtk_widget_set_sensitive(dialog->expander, FALSE);
		gtk_widget_set_sensitive(dialog->open_button, FALSE);
		gtk_widget_set_sensitive(dialog->stop_button, FALSE);

		gtk_widget_set_visible(dialog->stop_button, TRUE);
		gtk_widget_set_visible(dialog->remove_button, FALSE);

		return;
	}

	if (dialog->selected_xfer != xfer)
		return;

	if (purple_xfer_is_completed(xfer)) {
		gtk_widget_set_visible(dialog->stop_button, FALSE);
		gtk_widget_set_visible(dialog->remove_button, TRUE);

#ifdef _WIN32
		/* If using Win32... */
		if (purple_xfer_get_xfer_type(xfer) == PURPLE_XFER_TYPE_RECEIVE) {
			gtk_widget_set_sensitive(dialog->open_button, TRUE);
		} else {
			gtk_widget_set_sensitive(dialog->open_button, FALSE);
		}
#else
		if (purple_xfer_get_xfer_type(xfer) == PURPLE_XFER_TYPE_RECEIVE) {
			gtk_widget_set_sensitive(dialog->open_button, TRUE);
		} else {
			gtk_widget_set_sensitive (dialog->open_button, FALSE);
		}
#endif

		gtk_widget_set_sensitive(dialog->remove_button, TRUE);
	} else if (purple_xfer_is_cancelled(xfer)) {
		gtk_widget_set_visible(dialog->stop_button, FALSE);
		gtk_widget_set_visible(dialog->remove_button, TRUE);

		gtk_widget_set_sensitive(dialog->open_button,  FALSE);

		gtk_widget_set_sensitive(dialog->remove_button, TRUE);
	} else {
		gtk_widget_set_visible(dialog->stop_button, TRUE);
		gtk_widget_set_visible(dialog->remove_button, FALSE);

		gtk_widget_set_sensitive(dialog->open_button,  FALSE);
		gtk_widget_set_sensitive(dialog->stop_button,   TRUE);
	}
}

static void
ensure_row_selected(PidginXferDialog *dialog)
{
	GtkTreeIter iter;
	GtkTreeSelection *selection;

	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(dialog->tree));

	if (gtk_tree_selection_get_selected(selection, NULL, &iter))
		return;

	if (gtk_tree_model_get_iter_first(GTK_TREE_MODEL(dialog->model), &iter))
		gtk_tree_selection_select_iter(selection, &iter);
}

/**************************************************************************
 * Callbacks
 **************************************************************************/
static gboolean
close_request_cb(G_GNUC_UNUSED GtkWidget *w, gpointer d) {
	PidginXferDialog *dialog = (PidginXferDialog *)d;

	pidgin_xfer_dialog_hide(dialog);

	return TRUE;
}

static void
toggle_keep_open_cb(GtkWidget *w, G_GNUC_UNUSED gpointer data)
{
	purple_prefs_set_bool(
	        PIDGIN_PREFS_ROOT "/filetransfer/keep_open",
	        !gtk_check_button_get_active(GTK_CHECK_BUTTON(w)));
}

static void
toggle_clear_finished_cb(GtkWidget *w, G_GNUC_UNUSED gpointer data)
{
	purple_prefs_set_bool(
	        PIDGIN_PREFS_ROOT "/filetransfer/clear_finished",
	        gtk_check_button_get_active(GTK_CHECK_BUTTON(w)));
}

static void
selection_changed_cb(GtkTreeSelection *selection, PidginXferDialog *dialog)
{
	GtkTreeIter iter;
	PurpleXfer *xfer = NULL;

	if (gtk_tree_selection_get_selected(selection, NULL, &iter)) {
		GValue val;

		gtk_widget_set_sensitive(dialog->expander, TRUE);

		val.g_type = 0;
		gtk_tree_model_get_value(GTK_TREE_MODEL(dialog->model), &iter,
		                         COLUMN_XFER, &val);
		xfer = g_value_get_object(&val);

		update_detailed_info(dialog, xfer);

		dialog->selected_xfer = xfer;
	}
	else {
		gtk_expander_set_expanded(GTK_EXPANDER(dialog->expander),
									 FALSE);

		gtk_widget_set_sensitive(dialog->expander, FALSE);

		dialog->selected_xfer = NULL;
	}

	update_buttons(dialog, xfer);
}

static void
open_button_cb(G_GNUC_UNUSED GtkButton *button, PidginXferDialog *dialog)
{
	gchar *uri = NULL;

	uri = g_strdup_printf("file://%s",
	                      purple_xfer_get_local_filename(dialog->selected_xfer));
	gtk_show_uri(GTK_WINDOW(dialog), uri, GDK_CURRENT_TIME);
	g_free(uri);
}

static void
remove_button_cb(G_GNUC_UNUSED GtkButton *button, PidginXferDialog *dialog)
{
	pidgin_xfer_dialog_remove_xfer(dialog, dialog->selected_xfer);
}

static void
stop_button_cb(G_GNUC_UNUSED GtkButton *button, PidginXferDialog *dialog)
{
	purple_xfer_cancel_local(dialog->selected_xfer);
}

static void
close_button_cb(G_GNUC_UNUSED GtkButton *button, PidginXferDialog *dialog)
{
	pidgin_xfer_dialog_hide(dialog);
}


/**************************************************************************
 * Dialog Building Functions
 **************************************************************************/
PidginXferDialog *
pidgin_xfer_dialog_new(void)
{
	return PIDGIN_XFER_DIALOG(g_object_new(PIDGIN_TYPE_XFER_DIALOG, NULL));
}

static void
pidgin_xfer_dialog_class_init(PidginXferDialogClass *klass)
{
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);

	gtk_widget_class_set_template_from_resource(
	        widget_class, "/im/pidgin/Pidgin3/Xfer/xfer.ui");

	gtk_widget_class_bind_template_callback(widget_class, close_request_cb);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     tree);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     model);
	gtk_widget_class_bind_template_callback(widget_class,
	                                        selection_changed_cb);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     keep_open);
	gtk_widget_class_bind_template_callback(widget_class,
	                                        toggle_keep_open_cb);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     auto_clear);
	gtk_widget_class_bind_template_callback(widget_class,
	                                        toggle_clear_finished_cb);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     expander);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     local_user_desc_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     local_user_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     remote_user_desc_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     remote_user_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     protocol_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     filename_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     localfile_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     status_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     speed_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     time_elapsed_label);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     time_remaining_label);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     progress);

	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     open_button);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     remove_button);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     stop_button);
	gtk_widget_class_bind_template_child(widget_class, PidginXferDialog,
	                                     close_button);

	gtk_widget_class_bind_template_callback(widget_class, open_button_cb);
	gtk_widget_class_bind_template_callback(widget_class, remove_button_cb);
	gtk_widget_class_bind_template_callback(widget_class, stop_button_cb);
	gtk_widget_class_bind_template_callback(widget_class, close_button_cb);
}

static void
pidgin_xfer_dialog_init(PidginXferDialog *dialog)
{
	gtk_widget_init_template(GTK_WIDGET(dialog));

	/* "Close this window when all transfers finish" */
	gtk_check_button_set_active(
	        GTK_CHECK_BUTTON(dialog->keep_open),
	        !purple_prefs_get_bool(PIDGIN_PREFS_ROOT
	                               "/filetransfer/keep_open"));

	/* "Clear finished transfers" */
	gtk_check_button_set_active(
	        GTK_CHECK_BUTTON(dialog->auto_clear),
	        purple_prefs_get_bool(PIDGIN_PREFS_ROOT
	                              "/filetransfer/clear_finished"));
}

void
pidgin_xfer_dialog_destroy(PidginXferDialog *dialog)
{
	g_return_if_fail(dialog != NULL);

	purple_notify_close_with_handle(dialog);

	gtk_window_destroy(GTK_WINDOW(dialog));
}

void
pidgin_xfer_dialog_show(PidginXferDialog *dialog)
{
	PidginXferDialog *tmp;

	if (dialog == NULL) {
		tmp = pidgin_get_xfer_dialog();

		if (tmp == NULL) {
			tmp = pidgin_xfer_dialog_new();
			pidgin_set_xfer_dialog(tmp);
		}

		gtk_widget_set_visible(GTK_WIDGET(tmp), TRUE);
	} else {
		gtk_window_present(GTK_WINDOW(dialog));
	}
}

void
pidgin_xfer_dialog_hide(PidginXferDialog *dialog)
{
	g_return_if_fail(dialog != NULL);

	purple_notify_close_with_handle(dialog);

	gtk_widget_set_visible(GTK_WIDGET(dialog), FALSE);
}

void
pidgin_xfer_dialog_add_xfer(PidginXferDialog *dialog, PurpleXfer *xfer)
{
	PidginXferUiData *data;
	PurpleXferType type;
	const gchar *icon_name;
	char *size_str, *remaining_str;
	char *lfilename, *utf8;

	g_return_if_fail(dialog != NULL);
	g_return_if_fail(xfer != NULL);

	g_object_ref(xfer);

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);

	pidgin_xfer_dialog_show(dialog);

	data->last_updated_time = 0;

	type = purple_xfer_get_xfer_type(xfer);

	size_str = g_format_size(purple_xfer_get_size(xfer));
	remaining_str = g_format_size(purple_xfer_get_bytes_remaining(xfer));

	icon_name = (type == PURPLE_XFER_TYPE_RECEIVE ?  "go-down" : "go-up");

	gtk_list_store_append(dialog->model, &data->iter);
	lfilename = g_path_get_basename(purple_xfer_get_local_filename(xfer));
	utf8 = g_filename_to_utf8(lfilename, -1, NULL, NULL, NULL);
	g_free(lfilename);
	lfilename = utf8;
	gtk_list_store_set(dialog->model, &data->iter, COLUMN_STATUS, icon_name,
	                   COLUMN_PROGRESS, 0, COLUMN_FILENAME,
	                   (type == PURPLE_XFER_TYPE_RECEIVE)
	                           ? purple_xfer_get_filename(xfer)
	                           : lfilename,
	                   COLUMN_SIZE, size_str, COLUMN_REMAINING,
	                   _("Waiting for transfer to begin"), COLUMN_XFER,
	                   xfer, -1);
	g_free(lfilename);

	gtk_tree_view_columns_autosize(GTK_TREE_VIEW(dialog->tree));

	g_free(size_str);
	g_free(remaining_str);

	ensure_row_selected(dialog);
	update_title_progress(dialog);
}

void
pidgin_xfer_dialog_remove_xfer(PidginXferDialog *dialog,
								PurpleXfer *xfer)
{
	PidginXferUiData *data;

	g_return_if_fail(dialog != NULL);
	g_return_if_fail(xfer != NULL);

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);

	if (data == NULL)
		return;

	if (!purple_xfer_get_visible(xfer)) {
		return;
	}

	purple_xfer_set_visible(xfer, FALSE);

	gtk_list_store_remove(GTK_LIST_STORE(dialog->model), &data->iter);

	ensure_row_selected(dialog);

	update_title_progress(dialog);
	g_object_unref(xfer);
}

void
pidgin_xfer_dialog_cancel_xfer(PidginXferDialog *dialog,
								PurpleXfer *xfer)
{
	PidginXferUiData *data;
	const gchar *status;

	g_return_if_fail(dialog != NULL);
	g_return_if_fail(xfer != NULL);

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);

	if (data == NULL)
		return;

	if (!purple_xfer_get_visible(xfer)) {
		return;
	}

	if(purple_xfer_get_status(xfer) == PURPLE_XFER_STATUS_CANCEL_LOCAL &&
	   gtk_check_button_get_active(GTK_CHECK_BUTTON(dialog->auto_clear)))
	{
		pidgin_xfer_dialog_remove_xfer(dialog, xfer);
		return;
	}

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);

	update_detailed_info(dialog, xfer);
	update_title_progress(dialog);

	if (purple_xfer_is_cancelled(xfer))
		status = _("Cancelled");
	else
		status = _("Failed");

	gtk_list_store_set(dialog->model, &data->iter,
	                   COLUMN_STATUS, "dialog-error",
	                   COLUMN_REMAINING, status,
	                   -1);

	update_buttons(dialog, xfer);
}

void
pidgin_xfer_dialog_update_xfer(PidginXferDialog *dialog,
								PurpleXfer *xfer)
{
	PidginXferUiData *data;
	char *size_str, *remaining_str;
	gint64 current_time;
	GtkTreeIter iter;
	gboolean valid;

	g_return_if_fail(dialog != NULL);
	g_return_if_fail(xfer != NULL);

	data = g_object_get_data(G_OBJECT(xfer), UI_DATA);
	if (data == NULL || !purple_xfer_get_visible(xfer)) {
		return;
	}

	current_time = g_get_monotonic_time();
	if (((current_time - data->last_updated_time) < G_USEC_PER_SEC) &&
		(!purple_xfer_is_completed(xfer)))
	{
		/* Don't update the window more than once per second */
		return;
	}
	data->last_updated_time = current_time;

	size_str = g_format_size(purple_xfer_get_size(xfer));
	remaining_str = g_format_size(purple_xfer_get_bytes_remaining(xfer));

	gtk_list_store_set(xfer_dialog->model, &data->iter,
					   COLUMN_PROGRESS, (gint)(purple_xfer_get_progress(xfer) * 100),
					   COLUMN_SIZE, size_str,
					   COLUMN_REMAINING, remaining_str,
					   -1);

	g_free(size_str);
	g_free(remaining_str);

	if (purple_xfer_is_completed(xfer))
	{
		gtk_list_store_set(GTK_LIST_STORE(xfer_dialog->model), &data->iter,
						   COLUMN_STATUS, NULL,
						   COLUMN_REMAINING, _("Finished"),
						   -1);
	}

	update_title_progress(dialog);
	if (xfer == dialog->selected_xfer)
		update_detailed_info(xfer_dialog, xfer);

	if(purple_xfer_is_completed(xfer) &&
	   gtk_check_button_get_active(GTK_CHECK_BUTTON(dialog->auto_clear)))
	{
		pidgin_xfer_dialog_remove_xfer(dialog, xfer);
	} else {
		update_buttons(dialog, xfer);
	}

	/*
	 * If all transfers are finished, and the pref is set, then
	 * close the dialog.  Otherwise just exit this function.
	 */
	if(!gtk_check_button_get_active(GTK_CHECK_BUTTON(dialog->keep_open))) {
		return;
	}

	valid = gtk_tree_model_get_iter_first(GTK_TREE_MODEL(dialog->model), &iter);
	while (valid)
	{
		GValue val;
		PurpleXfer *next;

		val.g_type = 0;
		gtk_tree_model_get_value(GTK_TREE_MODEL(dialog->model), &iter,
		                         COLUMN_XFER, &val);
		next = g_value_get_object(&val);

		if (!purple_xfer_is_completed(next))
			return;

		valid = gtk_tree_model_iter_next(GTK_TREE_MODEL(dialog->model), &iter);
	}

	/* If we got to this point then we know everything is finished */
	pidgin_xfer_dialog_hide(dialog);
}

/**************************************************************************
 * File Transfer UI Ops
 **************************************************************************/
static void
pidgin_xfer_add_thumbnail(PurpleXfer *xfer, const gchar *formats,
                          G_GNUC_UNUSED gpointer data)
{
	purple_debug_info("xfer", "creating thumbnail for transfer\n");

	if (purple_xfer_get_size(xfer) <= PIDGIN_XFER_MAX_SIZE_IMAGE_THUMBNAIL) {
		GdkPixbuf *thumbnail =
			purple_gdk_pixbuf_new_from_file_at_size(
					purple_xfer_get_local_filename(xfer), 128, 128);

		if (thumbnail) {
			gchar **formats_split = g_strsplit(formats, ",", 0);
			gchar *buffer = NULL;
			gsize size;
			char *option_keys[2] = {NULL, NULL};
			char *option_values[2] = {NULL, NULL};
			int i;
			gchar *format = NULL;

			for (i = 0; formats_split[i]; i++) {
				if (purple_strequal(formats_split[i], "jpeg")) {
					purple_debug_info("xfer", "creating JPEG thumbnail\n");
					option_keys[0] = "quality";
					option_values[0] = "90";
					format = "jpeg";
					break;
				} else if (purple_strequal(formats_split[i], "png")) {
					purple_debug_info("xfer", "creating PNG thumbnail\n");
					option_keys[0] = "compression";
					option_values[0] = "9";
					format = "png";
					break;
				}
			}

			/* Try the first format given by the protocol without options */
			if (format == NULL) {
				purple_debug_info("xfer",
				    "creating thumbnail of format %s as demanded by protocol\n",
				    formats_split[0]);
				format = formats_split[0];
			}

			gdk_pixbuf_save_to_bufferv(thumbnail, &buffer, &size, format,
				option_keys, option_values, NULL);

			if (buffer) {
				gchar *mimetype = g_strdup_printf("image/%s", format);
				purple_debug_info("xfer",
				                  "created thumbnail of %" G_GSIZE_FORMAT " bytes\n",
					size);
				purple_xfer_set_thumbnail(xfer, buffer, size, mimetype);
				g_free(buffer);
				g_free(mimetype);
			}
			g_object_unref(thumbnail);
			g_strfreev(formats_split);
		}
	}
}

static void
pidgin_xfer_progress_notify(PurpleXfer *xfer, G_GNUC_UNUSED GParamSpec *pspec,
                            G_GNUC_UNUSED gpointer data)
{
	pidgin_xfer_dialog_update_xfer(xfer_dialog, xfer);
}

static void
pidgin_xfer_status_notify(PurpleXfer *xfer, G_GNUC_UNUSED GParamSpec *pspec,
                          G_GNUC_UNUSED gpointer data)
{
	if (xfer_dialog) {
		if (purple_xfer_is_cancelled(xfer)) {
			pidgin_xfer_dialog_cancel_xfer(xfer_dialog, xfer);
		}
	}
}

static void
pidgin_xfer_visible_notify(PurpleXfer *xfer, G_GNUC_UNUSED GParamSpec *pspec,
                           G_GNUC_UNUSED gpointer data)
{
	if (!purple_xfer_get_visible(xfer)) {
		return;
	}

	if (xfer_dialog == NULL) {
		xfer_dialog = pidgin_xfer_dialog_new();
	}

	pidgin_xfer_dialog_add_xfer(xfer_dialog, xfer);
}

static void
pidgin_xfer_new_xfer(PurpleXfer *xfer)
{
	PidginXferUiData *data;

	/* This is where we're setting xfer's "ui_data" for the first time. */
	data = g_new0(PidginXferUiData, 1);
	g_object_set_data_full(G_OBJECT(xfer), UI_DATA, data, g_free);

	g_signal_connect(xfer, "add-thumbnail",
	                 G_CALLBACK(pidgin_xfer_add_thumbnail), NULL);
	g_signal_connect(xfer, "notify::progress",
	                 G_CALLBACK(pidgin_xfer_progress_notify), NULL);
	g_signal_connect(xfer, "notify::status",
	                 G_CALLBACK(pidgin_xfer_status_notify), NULL);
	g_signal_connect(xfer, "notify::visible",
	                 G_CALLBACK(pidgin_xfer_visible_notify), NULL);
}

static PurpleXferUiOps ops = {
	.new_xfer = pidgin_xfer_new_xfer
};

/**************************************************************************
 * GTK File Transfer API
 **************************************************************************/
void
pidgin_xfers_init(void)
{
	purple_prefs_add_none(PIDGIN_PREFS_ROOT "/filetransfer");
	purple_prefs_add_bool(PIDGIN_PREFS_ROOT "/filetransfer/clear_finished", TRUE);
	purple_prefs_add_bool(PIDGIN_PREFS_ROOT "/filetransfer/keep_open", FALSE);
}

void
pidgin_xfers_uninit(void)
{
	g_clear_pointer(&xfer_dialog, pidgin_xfer_dialog_destroy);
}

void
pidgin_set_xfer_dialog(PidginXferDialog *dialog)
{
	xfer_dialog = dialog;
}

PidginXferDialog *
pidgin_get_xfer_dialog(void)
{
	return xfer_dialog;
}

PurpleXferUiOps *
pidgin_xfers_get_ui_ops(void)
{
	return &ops;
}