/**
 * erwin - really simple html editor
 * Copyright (C) 2003 Adrian Reber
 *
 * 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
 *
 * $Id: erwinhighlighting.c,v 1.6 2004/07/03 20:14:25 erwin Exp $
 *
 * $Author: erwin $
 * 
 * Description: syntax higlighting related stuff
 *
 * $Log: erwinhighlighting.c,v $
 * Revision 1.6  2004/07/03 20:14:25  erwin
 * commit
 *
 * Revision 1.5  2004/06/21 21:45:19  erwin
 * big commit
 * it has been a long time without a checkout
 * we are close to version 0.7
 *
 * Revision 1.4  2004/03/24 14:59:38  erwin
 * copy external files to prefix/share/erwin
 *
 * Revision 1.3  2004/03/11 21:05:01  erwin
 * too many changes without commits
 *
 * Revision 1.2  2003/10/30 20:54:06  erwin
 * syntax highlighting implementation
 *
 * Revision 1.1  2003/10/24 13:32:07  erwin
 * syntax higlighting
 *
 */

#ifndef lint
static const char vcid[] = "$Id: erwinhighlighting.c,v 1.6 2004/07/03 20:14:25 erwin Exp $";
#endif				/* lint */

#include <gtk/gtk.h>
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <erwindef.h>
#include <erwin.h>
#include <gtksourceview/gtksourceview.h>
#include <libxml/parser.h>
#include <erwinfunctions.h>

void toggle_syntax_highlighting(gpointer callback_data, guint callback_action, GtkWidget * widget)
{
	struct document *document;
	GtkTextBuffer *buffer;

	document = (g_list_nth(documents, gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook_main))))->data;

	if (document->is_rendered) {
		gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(widget), TRUE);
		return;
	}

	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(document->text_view));
	if (gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(widget)))
		g_object_set(G_OBJECT(buffer), "highlight", FALSE, NULL);
	else
		g_object_set(G_OBJECT(buffer), "highlight", TRUE, NULL);
	g_object_get(G_OBJECT(buffer), "highlight", &(document->syntax_highlighting), NULL);
}

void change_highlighting_mode(GtkMenuItem * menuitem, gpointer user_data)
{
	struct document *document;
	GtkTextBuffer *buffer;
	int i = 0;
	gpointer blub;

	document = (g_list_nth(documents, gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook_main))))->data;
	if (document->is_rendered) {
		while ((blub = g_slist_nth_data(highlighting_group, i++)))
			GTK_CHECK_MENU_ITEM(blub)->active = FALSE;
		return;
	}
	document->syntax_highlighting_menuitem = GTK_WIDGET(menuitem);
	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(document->text_view));

	if (user_data) {
		document->language = GTK_SOURCE_LANGUAGE(user_data);
		gtk_source_buffer_set_language(GTK_SOURCE_BUFFER(buffer), document->language);
		add_to_statusbar(gtk_source_language_get_name(document->language), TRUE);
	}
}

void populate_highlighting_menu(GtkWidget * menubar)
{
	GtkItemFactory *factory;
	GtkWidget *highlighting_menu;
	GtkWidget *menuitem;
	GSList *languages = NULL;

	//GSList *group = NULL;
	struct document *document;
	gpointer blub;
	int i = 0;

	if (!menubar)
		return;

	document = (g_list_nth(documents, gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook_main))))->data;

	factory = gtk_item_factory_from_widget(menubar);
	highlighting_menu = gtk_item_factory_get_widget(factory, "<main>/Options/Syntax Highlighting");

	menuitem = gtk_radio_menu_item_new_with_label(highlighting_group, "by Extension");
	gtk_menu_shell_append(GTK_MENU_SHELL(highlighting_menu), menuitem);
	highlighting_group = gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
	g_signal_connect(G_OBJECT(menuitem), "activate", G_CALLBACK(change_highlighting_mode), NULL);
	gtk_widget_show(menuitem);

	languages = (GSList *)
	    gtk_source_languages_manager_get_available_languages(document->manager);
	while ((blub = g_slist_nth_data(languages, i++))) {
		menuitem =
		    gtk_radio_menu_item_new_with_label(highlighting_group,
		    gtk_source_language_get_name(blub));
		highlighting_group = gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
		gtk_menu_shell_append(GTK_MENU_SHELL(highlighting_menu), menuitem);
		g_signal_connect(G_OBJECT(menuitem), "activate", G_CALLBACK(change_highlighting_mode), blub);
		gtk_widget_show(menuitem);
	}
}

char *get_mime_type(const char *filename)
{
	char *extension = NULL;
	xmlNodePtr cur;
	xmlDocPtr mime_type_table = NULL;
	char *mime_type = NULL;

	_DEBUG_ fprintf(stderr, "%s:extension: %s\n", PACKAGE, extension);
	_DEBUG_ fprintf(stderr, "%s:filename: %s\n", PACKAGE, filename);

	extension = strrchr(filename, 46);
	_DEBUG_ fprintf(stderr, "%s:extension: %s\n", PACKAGE, extension);

	if (!extension++)
		return mime_type;
	_DEBUG_ fprintf(stderr, "%s:extension: %s\n", PACKAGE, extension);

	mime_type_table = xmlParseFile(MIME_FILE);
	cur = xmlDocGetRootElement(mime_type_table);
	if (!cur)
		return mime_type;

	_DEBUG_ fprintf(stderr, "%s:2top level node: %s\n", PACKAGE, cur->name);

	if (!xmlStrcmp(cur->name, (const xmlChar *) "erwin")) {

		cur = cur->xmlChildrenNode;
		while (cur != NULL) {
			_DEBUG_ fprintf(stderr, "%s:name:%s\n", PACKAGE, cur->name);
			_DEBUG_ fprintf(stderr, "%s:get_string:%s\n", PACKAGE,
			    xmlNodeListGetString(mime_type_table, cur->xmlChildrenNode, 1));
			if (!xmlStrcmp(cur->name, (const xmlChar *) "mime-type")) {
				if (!strcmp(extension, (const char *) xmlGetProp(cur,
					    (const xmlChar *) "ext"))) {
					mime_type =
					    strdup((const char *) xmlGetProp(cur, (const xmlChar *) "type"));
					break;
				}
			}
			cur = cur->next;
		}
	}
	xmlFreeDoc(mime_type_table);
	return mime_type;
}

void activate_highlighting_from_filename(struct document *document)
{
	GtkTextBuffer *buffer;
	char *mime_type = NULL;

	if (document->is_rendered)
		return;

	_DEBUG_ fprintf(stderr, "%s:filename: %s\n", PACKAGE, document->filename->str);

	mime_type = get_mime_type(document->filename->str);
	if (!mime_type)
		return;
	buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(document->text_view));
	document->language =
	    gtk_source_languages_manager_get_language_from_mime_type(document->manager, mime_type);
	gtk_source_buffer_set_language(GTK_SOURCE_BUFFER(buffer), document->language);
	add_to_statusbar(gtk_source_language_get_name(document->language), TRUE);
	free(mime_type);
}