/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "vn-image.h"
#include <db/db.h>

#define set_default_image(self) g_object_set (self->image, \
	"icon-name", "dialog-question", "icon-size", GTK_ICON_SIZE_DIALOG, NULL)

/**
 * SECTION:vn-image
 * @Short_description: an image widget
 * @Title: VnImage
 * @See_also: #VnField
 * @Image: image.png
 *
 * An image widget that allows to set a new image with a double click.
 */
G_DEFINE_TYPE (VnImage, vn_image, VN_TYPE_FIELD);

/**
 * vn_image_new:
 *
 * Creates a new #VnImage
 *
 * Return value: a #VnImage
 **/
VnField * vn_image_new ()
{
	return g_object_new (VN_TYPE_IMAGE, NULL);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void vn_image_set_value (VnImage * self, const GValue * value)
{
	GBytes * bytes = NULL;

	if (!gvn_value_is_null (value)
	&& G_VALUE_TYPE (value) == G_TYPE_BYTES)
		bytes = g_value_get_boxed (value);

	if (bytes)
	{
		gsize size;
		const guchar * data;
		GError * err = NULL;
		GdkPixbufLoader * loader;

		loader = gdk_pixbuf_loader_new ();
		data = g_bytes_get_data (bytes, &size);

		if (gdk_pixbuf_loader_write (loader, data, size, &err)
		&& gdk_pixbuf_loader_close (loader, &err))
		{
			GdkPixbuf * pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
			gtk_image_set_from_pixbuf (self->image, pixbuf);
		}
		else
		{
			g_warning ("%s",err->message);
			g_error_free (err);
			set_default_image (self);
		}
		
		g_object_unref (loader);
	}
	else
		set_default_image (self);
}

static void vn_image_on_update_preview (GtkFileChooser * chooser, GtkImage * image)
{
	char *filename;
	GdkPixbuf *pixbuf;

	filename = gtk_file_chooser_get_preview_filename (chooser);
	
	if (filename)
	{
		pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 128, 128, NULL);
		g_free (filename);

		if (pixbuf)
		{
			gtk_image_set_from_pixbuf (image, pixbuf);
			g_object_unref (pixbuf);
		}
	}
	else
		pixbuf = NULL;

	gtk_file_chooser_set_preview_widget_active (chooser, pixbuf != NULL);
}

static gboolean vn_image_on_event (VnField * field, GdkEvent * event, VnImage * self)
{
	if (event->type != GDK_2BUTTON_PRESS)
		return FALSE;
	
	GtkWidget * image;
	GtkWidget * toplevel;
	GtkFileChooser * chooser;
	GtkFileFilter * filter;

	filter = gtk_file_filter_new ();
	gtk_file_filter_add_mime_type (filter, "image/png");
	gtk_file_filter_add_mime_type (filter, "image/jpeg");
	gtk_file_filter_add_mime_type (filter, "image/gif");
	gtk_file_filter_add_mime_type (filter, "image/bmp");
	gtk_file_filter_add_mime_type (filter, "image/svg+xml");
	
	toplevel = gtk_widget_get_toplevel (GTK_WIDGET (self));
	
	if (!gtk_widget_is_toplevel (toplevel))
		toplevel = NULL;
	
	chooser = GTK_FILE_CHOOSER (gtk_file_chooser_dialog_new (
		 _("Select the image")
		,GTK_WINDOW (toplevel)
		,GTK_FILE_CHOOSER_ACTION_OPEN
		,"Cancel", GTK_RESPONSE_CANCEL
		,"Open", GTK_RESPONSE_ACCEPT
		,NULL
	));
	gtk_file_chooser_set_filter (chooser, filter);
	
	image = gtk_image_new ();
	gtk_file_chooser_set_preview_widget (chooser, image);
	g_signal_connect (chooser, "update-preview",
		G_CALLBACK (vn_image_on_update_preview), image);
	
	if (gtk_dialog_run (GTK_DIALOG (chooser)) == GTK_RESPONSE_ACCEPT)
	{
		gsize len;
		gchar * data;
		gchar * filename;
		GError * err = NULL;

		filename = gtk_file_chooser_get_filename (chooser);

		if (g_file_get_contents (filename, &data, &len, &err))
		{
			GValue value = G_VALUE_INIT;
			g_value_init (&value, G_TYPE_BYTES);
			g_value_take_boxed (&value, g_bytes_new_take (data, len));

			VN_FIELD_GET_CLASS (self)->value_changed (VN_FIELD (self), &value);
			vn_image_set_value (self, &value);
			g_value_unset (&value);
		}
		else
		{
			g_warning ("%s", err->message);
			g_error_free (err);
		}
		
		g_free (filename);
	}
	
	gtk_widget_destroy (GTK_WIDGET (chooser));
	return FALSE;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void vn_image_init (VnImage * self)
{
	self->image = GTK_IMAGE (gtk_image_new ());
	g_signal_connect (self, "event",
		G_CALLBACK (vn_image_on_event), self);
	set_default_image (self);
	gtk_container_add (GTK_CONTAINER (self), GTK_WIDGET (self->image));

	VN_FIELD_GET_CLASS (self)->set_widget (VN_FIELD (self),
		GTK_WIDGET (self->image));
}

static void vn_image_finalize (VnImage * self)
{
	G_OBJECT_CLASS (vn_image_parent_class)->finalize (G_OBJECT (self));
}

static void vn_image_class_init (VnImageClass * klass)
{
	G_OBJECT_CLASS (klass)->finalize = (GObjectFinalizeFunc) vn_image_finalize;
	VN_FIELD_CLASS (klass)->set_value = (VnFieldSetValueFunc) vn_image_set_value;
}