/***************************************************************************
 * This file is part of the KDE project
 * copyright (C) 2005 by Sebastian Sauer (mail@dipe.org)
 * copyright (C) 2006 by Bernd Steindorff (bernd@itii.de)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 ***************************************************************************/

#include "xmlhandler.h"
#include "macro.h"
#include "macroitem.h"
#include "action.h"

#include <qdom.h>
#include <kdebug.h>

using namespace KoMacro;

namespace KoMacro {

	/**
	* @internal d-pointer class to be more flexible on future extension of the
	* functionality without to much risk to break the binary compatibility.
	*/
	class XMLHandler::Private
	{
		public:

			/**
			* The @a Macro instance this @a XMLHandler
			* manages.
			*/
			Macro* const macro;

			/**
			* Constructor.
			*
			* @param macro The @a Macro instance this
			* @a XMLHandler manages.
			*/
			Private(Macro* const macro)
				: macro(macro)
			{
			}
	};

}

XMLHandler::XMLHandler(Macro* const macro)
	: d( new Private(macro) )
{
}

XMLHandler::~XMLHandler()
{
	delete d;
}

bool XMLHandler::parseXML(const QDomElement& element)
{
	// Remove old items. We should clear first.
	d->macro->clearItems();

	// We expect a <macro> element. Do we really need to be such strict or
	// would it be more wise to trust the application in that case?
	if(element.tagName() != "macro") {
		kdDebug() << QString("XMLHandler::parseXML() Invalid tagname \"%1\"").arg(element.tagName()) << endl;
		return false;
	}
	
	// To be flexible with the xml-scheme, we need a version-number for xml.
	// If there is more than one version, parsing should update old macro-data, so that it
	// could write out in the newer version in toXML().
	if( element.attribute("xmlversion") != "1"){
		kdDebug() << QString("XMLHandler::parseXML() Invalid xml-version \"%1\"").arg(element.attribute("xmlversion")) << endl;
		return false;
	}

	// Do we need to load the macro's name?
	// d->macro->setName(element.attribute("name"));

	// Iterate through the child nodes the passed QDomElement has and
	// build the MacroItem elements.
	for(QDomNode itemnode = element.firstChild(); ! itemnode.isNull(); itemnode = itemnode.nextSibling()) {
		// The tagname should be "item"
		if(itemnode.nodeName() == "item") {
			// The node is an element.
			const QDomElement itemelem = itemnode.toElement();

			// Create a new MacroItem
			KSharedPtr<MacroItem> item = new MacroItem();

			// Add the new item to our Macro.
			d->macro->addItem( item );

			// Each MacroItem may point to an Action instance. We
			// try to determinate this action now and if it's defined
			// and available, we set it.
			KSharedPtr<Action> action = Manager::self()->action( itemelem.attribute("action") );
			if(action.data()) {
				item->setAction(action);
			}

			// Set the comment
			item->setComment( itemelem.attribute("comment") );

			// Iterate through the children this item has and try
			// to fill the list of variables our new MacroItem has.
			for(QDomNode childnode = itemnode.firstChild(); ! childnode.isNull(); childnode = childnode.nextSibling()) {
				// The tagname should be "variable"
				if(childnode.nodeName() == "variable") {
					// The node is an element.
					const QDomElement childelem = childnode.toElement();

 					// The name the variable has.
 					const QString name = childelem.attribute("name");
					// The value the variable has.
					const QString value = childelem.text();

					// Store the new variable in our macroitem.
					item->addVariable(name, value);
				}
			}
		}
	}

	// Job was done successfully.
	return true;
}

QDomElement XMLHandler::toXML()
{
	// The QDomDocument provides us the functionality to create new QDomElement instances.
	QDomDocument document;

	// Create the Macro-QDomElement. This element will be returned.
	QDomElement macroelem = document.createElement("macro");

	// Set the Macro-XML-Version, it should be the newest Version.
	macroelem.setAttribute("xmlversion","1");

	// Do we need to store the macro's name? Normaly the application
	// could/should take care of it cause we don't know how the app
	// may store the XML and cause we don't like to introduce
	// redundancy at this point.
	//macroelem.setAttribute("name",d->macro->name());

	// The list of MacroItem-children a Macro provides.
	QValueList<KSharedPtr<MacroItem > > items = d->macro->items();

	// Create an iterator...
	QValueList<KSharedPtr<MacroItem > >::ConstIterator it(items.constBegin()), end(items.constEnd());
	// ...and iterate over the list of children the Macro provides.
	for(;it != end; ++it) {
		// We are iterating over MacroItem instances.
		KSharedPtr<MacroItem> item = *it;

		// Flag to determinate if we really need to remember this item what
		// is only the case if comment or action is defined.
		bool append = false;

		// Each MacroItem will have an own node.
		QDomElement itemelem = document.createElement("item");

		// Each MacroItem could point to an Action provided by the Manager.
		const KSharedPtr<Action> action = item->action();
		if( action ) {
			append = true;

			// Remember the name of the action.
			itemelem.setAttribute("action", action->name());

			// Each MacroItem could have a list of variables. We
			// iterate through that list and build a element
			// for each single variable.
			QMap<QString, KSharedPtr<Variable > > varmap = item->variables();

			for(QMap<QString, KSharedPtr<Variable > >::ConstIterator vit = varmap.constBegin(); vit != varmap.constEnd(); ++vit) {
				const KSharedPtr<Variable> v = vit.data();
				if(! v.data()) {
					// skip if the variable is NULL.
					continue;
				}
				// Create an own element for the variable. The tagname will be
				// the name of the variable.
				QDomElement varelement = document.createElement("variable");

				// Remember the name the value has.
				varelement.setAttribute("name", vit.key()); 

				// Remember the value as textnode.
				varelement.appendChild(document.createTextNode(v->toString()));

				// Add the new variable-element to our MacroItem.
				itemelem.appendChild(varelement);
			}
		}

		// Each MacroItem could have an optional comment.
		const QString comment = item->comment();
		if(! comment.isEmpty()) {
			append = true;
			itemelem.setAttribute("comment", item->comment());
		}

		// Check if we really need to remember the item.
		if(append) {
			macroelem.appendChild(itemelem);
		}

	}

	// Job done. Return the macro's element.
	return macroelem;
}