/* Statusbar Date -- Shows the EXIF date in EOM's statusbar
 *
 * Copyright (C) 2008 The Free Software Foundation
 *
 * Author: Claudio Saavedra  <csaavedra@gnome.org>
 *
 * 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.
 */

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

#include "eom-statusbar-date-plugin.h"

#include <gmodule.h>
#include <glib/gi18n-lib.h>

#include <libexif/exif-data.h>

#include <eom-debug.h>
#include <eom-scroll-view.h>
#include <eom-image.h>
#include <eom-thumb-view.h>
#include <eom-exif-util.h>


#define WINDOW_DATA_KEY "EomStatusbarDateWindowData"

EOM_PLUGIN_REGISTER_TYPE(EomStatusbarDatePlugin, eom_statusbar_date_plugin)

typedef struct {
	GtkWidget* statusbar_date;
	gulong signal_id;
} WindowData;

static void free_window_data(WindowData* data)
{
	g_return_if_fail(data != NULL);

	eom_debug(DEBUG_PLUGINS);

	g_free(data);
}

static void statusbar_set_date(GtkStatusbar* statusbar, EomThumbView* view)
{
	EomImage* image;
	gchar* date = NULL;
	gchar time_buffer[32];
	ExifData* exif_data;

	if (eom_thumb_view_get_n_selected(view) == 0)
	{
		return;
	}

	image = eom_thumb_view_get_first_selected_image(view);

	gtk_statusbar_pop(statusbar, 0);

	if (!eom_image_has_data(image, EOM_IMAGE_DATA_EXIF))
	{
		if (!eom_image_load(image, EOM_IMAGE_DATA_EXIF, NULL, NULL))
		{
			gtk_widget_hide(GTK_WIDGET(statusbar));
		}
	}

	exif_data = (ExifData*) eom_image_get_exif_info(image);

	if (exif_data)
	{
		date = eom_exif_util_format_date(eom_exif_util_get_value(exif_data, EXIF_TAG_DATE_TIME_ORIGINAL, time_buffer, 32));
		exif_data_unref(exif_data);
	}

	if (date)
	{
		gtk_statusbar_push(statusbar, 0, date);
		gtk_widget_show(GTK_WIDGET(statusbar));
		g_free(date);
	}
	else
	{
		gtk_widget_hide(GTK_WIDGET(statusbar));
	}
}

static void selection_changed_cb(EomThumbView* view, WindowData* data)
{
	statusbar_set_date(GTK_STATUSBAR(data->statusbar_date), view);
}

static void eom_statusbar_date_plugin_init(EomStatusbarDatePlugin* plugin)
{
	eom_debug_message(DEBUG_PLUGINS, "EomStatusbarDatePlugin initializing");
}

static void eom_statusbar_date_plugin_finalize(GObject* object)
{
	eom_debug_message(DEBUG_PLUGINS, "EomStatusbarDatePlugin finalizing");

	G_OBJECT_CLASS(eom_statusbar_date_plugin_parent_class)->finalize(object);
}

static void impl_activate(EomPlugin* plugin, EomWindow* window)
{
	GtkWidget* statusbar = eom_window_get_statusbar(window);
	GtkWidget* thumbview = eom_window_get_thumb_view(window);
	WindowData* data;

	eom_debug(DEBUG_PLUGINS);

	data = g_new(WindowData, 1);
	data->statusbar_date = gtk_statusbar_new();
	gtk_statusbar_set_has_resize_grip(GTK_STATUSBAR(data->statusbar_date), FALSE);
	gtk_widget_set_size_request(data->statusbar_date, 200, 10);
	gtk_box_pack_end(GTK_BOX(statusbar), data->statusbar_date, FALSE, FALSE, 0);

	data->signal_id = g_signal_connect_after(G_OBJECT(thumbview), "selection_changed", G_CALLBACK(selection_changed_cb), data);

	statusbar_set_date(GTK_STATUSBAR(data->statusbar_date), EOM_THUMB_VIEW(eom_window_get_thumb_view(window)));

	g_object_set_data_full(G_OBJECT(window), WINDOW_DATA_KEY, data, (GDestroyNotify) free_window_data);
}

static void impl_deactivate(EomPlugin* plugin, EomWindow* window)
{
	GtkWidget* statusbar = eom_window_get_statusbar(window);
	GtkWidget* view = eom_window_get_thumb_view(window);
	WindowData* data;

	data = (WindowData*) g_object_get_data(G_OBJECT (window), WINDOW_DATA_KEY);

	g_signal_handler_disconnect(view, data->signal_id);

	gtk_container_remove(GTK_CONTAINER(statusbar), data->statusbar_date);

	g_object_set_data(G_OBJECT(window), WINDOW_DATA_KEY, NULL);
}

static void impl_update_ui(EomPlugin* plugin, EomWindow* window)
{
	/* nothing */
}

static void eom_statusbar_date_plugin_class_init (EomStatusbarDatePluginClass* klass)
{
	GObjectClass* object_class = G_OBJECT_CLASS(klass);
	EomPluginClass* plugin_class = EOM_PLUGIN_CLASS(klass);

	object_class->finalize = eom_statusbar_date_plugin_finalize;

	plugin_class->activate = impl_activate;
	plugin_class->deactivate = impl_deactivate;
	plugin_class->update_ui = impl_update_ui;
}
