// This file is part of RSS Guard.
//
// Copyright (C) 2011-2017 by Martin Rotter <rotter.martinos@gmail.com>
//
// RSS Guard 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.
//
// RSS Guard 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 RSS Guard. If not, see <http://www.gnu.org/licenses/>.

#include "services/standard/feedparser.h"

#include "exceptions/applicationexception.h"


FeedParser::FeedParser(const QString& data) : m_xmlData(data) {
	m_xml.setContent(m_xmlData, true);
}

FeedParser::~FeedParser() {
}

QList<Message> FeedParser::messages() {
	QString feed_author = feedAuthor();
	QList<Message> messages;
	QDateTime current_time = QDateTime::currentDateTime();
	// Pull out all messages.
	QDomNodeList messages_in_xml = messageElements();

	for (int i = 0; i < messages_in_xml.size(); i++) {
		QDomNode message_item = messages_in_xml.item(i);

		try {
			Message new_message = extractMessage(message_item.toElement(), current_time);

			if (new_message.m_author.isEmpty()) {
				new_message.m_author = feed_author;
			}

			messages.append(new_message);
		}

		catch (const ApplicationException& ex) {
			qDebug(qPrintable(ex.message()));
		}
	}

	return messages;
}

QStringList FeedParser::textsFromPath(const QDomElement& element, const QString& namespace_uri,
                                      const QString& xml_path, bool only_first) const {
	QStringList paths = xml_path.split('/');
	QStringList result;
	QList<QDomElement> current_elements;
	current_elements.append(element);

	while (!paths.isEmpty()) {
		QList<QDomElement> next_elements;
		QString next_local_name = paths.takeFirst();

		foreach (const QDomElement& elem, current_elements) {
			QDomNodeList elements = elem.elementsByTagNameNS(namespace_uri, next_local_name);

			for (int i = 0; i < elements.size(); i++) {
				next_elements.append(elements.at(i).toElement());

				if (only_first) {
					break;
				}
			}

			if (next_elements.size() == 1 && only_first) {
				break;
			}
		}

		current_elements = next_elements;
	}

	if (!current_elements.isEmpty()) {
		foreach (const QDomElement& elem, current_elements) {
			result.append(elem.text());
		}
	}

	return result;
}

QString FeedParser::feedAuthor() const {
	return "";
}