/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2011  Georg Rudoy
 *
 * 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 "rssparser.h"
#include <QDomDocument>
#include <QLocale>
#include <QtDebug>

namespace LeechCraft
{
	namespace Plugins
	{
		namespace Aggregator
		{
			RSSParser::RSSParser ()
			{
				TimezoneOffsets_ ["GMT"] = TimezoneOffsets_ ["UT"] = TimezoneOffsets_ ["Z"] = 0;
				TimezoneOffsets_ ["EST"] = -5;
				TimezoneOffsets_ ["EDT"] = -4;
				TimezoneOffsets_ ["CST"] = -6;
				TimezoneOffsets_ ["CDT"] = -5;
				TimezoneOffsets_ ["MST"] = -7;
				TimezoneOffsets_ ["MDT"] = -6;
				TimezoneOffsets_ ["PST"] = -8;
				TimezoneOffsets_ ["PDT"] = -7;
				TimezoneOffsets_ ["A"] = -1;
				TimezoneOffsets_ ["M"] = -12;
				TimezoneOffsets_ ["N"] = 1;
				TimezoneOffsets_ ["Y"] = +12;
			}
			
			RSSParser::~RSSParser ()
			{
			}
			
			QDateTime RSSParser::RFC822TimeToQDateTime (const QString& t) const
			{
				if (t.size () < 20)
					return QDateTime ();
			
				QString time = t.simplified ();
				short int hoursShift = 0, minutesShift = 0;
			
				QStringList tmp = time.split (' ');
				if (tmp.isEmpty ())
					return QDateTime ();
				if (tmp. at (0).contains (QRegExp ("\\D")))
					tmp.removeFirst ();
				if (tmp.size () != 5)
					return QDateTime ();
				QString timezone = tmp.takeAt (tmp.size () -1);
				if (timezone.size () == 5)
				{
					bool ok;
					int tz = timezone.toInt (&ok);
					if (ok)
					{
						hoursShift = tz / 100;
						minutesShift = tz % 100;
					}
				}
				else
					hoursShift = TimezoneOffsets_.value (timezone, 0);
			
			 	//HACK: This we don't need this according to rfc, but we added it
			 	//	to be compatible with some buggy rss generators
				if (tmp.at (0).size () == 1)
					tmp[0].prepend ("0");
			 	tmp [1].truncate (3);
			 	//HACK
			
				time = tmp.join (" ");
			
				QDateTime result;
				if (tmp.at (2).size () == 4)
					result = QLocale::c ().toDateTime(time, "dd MMM yyyy hh:mm:ss");
				else
					result = QLocale::c ().toDateTime(time, "dd MMM yy hh:mm:ss");
				if (result.isNull () || !result.isValid ())
					return QDateTime ();
				result = result.addSecs (hoursShift * 3600 * (-1) + minutesShift *60 * (-1));
				result.setTimeSpec (Qt::UTC);
				return result.toLocalTime ();
			}
			
			QList<Enclosure> RSSParser::GetEnclosures (const QDomElement& entry, const IDType_t& item) const
			{
				QList<Enclosure> result;
				QDomNodeList links = entry.elementsByTagName ("enclosure");
				for (int i = 0; i < links.size (); ++i)
				{
					QDomElement link = links.at (i).toElement ();
			
					Enclosure e (item);
					e.URL_ = link.attribute ("url");
					e.Type_ = link.attribute ("type");
					e.Length_ = link.attribute ("length", "-1").toLongLong ();
					e.Lang_ = link.attribute ("hreflang");
					result << e;
				}
				return result;
			}
		};
	};
};

