/* SPDX-FileCopyrightText: 2026 Project Tick
 * SPDX-FileContributor: Project Tick
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 *   MeshMC - A Custom Launcher for Minecraft
 *   Copyright (C) 2026 Project Tick
 *
 *   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 <https://www.gnu.org/licenses/>.
 *
 *  This file incorporates work covered by the following copyright and
 *  permission notice:
 *
 * Copyright 2013-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "NewsChecker.h"

#include <QByteArray>
#include <QDomDocument>

#include <QDebug>

NewsChecker::NewsChecker(shared_qobject_ptr<QNetworkAccessManager> network,
						 const QString& feedUrl)
{
	m_network = network;
	m_feedUrl = feedUrl;
}

void NewsChecker::reloadNews()
{
	// Start a netjob to download the RSS feed and call rssDownloadFinished()
	// when it's done.
	if (isLoadingNews()) {
		qDebug()
			<< "Ignored request to reload news. Currently reloading already.";
		return;
	}

	qDebug() << "Reloading news.";

	NetJob* job = new NetJob("News RSS Feed", m_network);
	job->addNetAction(Net::Download::makeByteArray(m_feedUrl, &newsData));
	QObject::connect(job, &NetJob::succeeded, this,
					 &NewsChecker::rssDownloadFinished);
	QObject::connect(job, &NetJob::failed, this,
					 &NewsChecker::rssDownloadFailed);
	m_newsNetJob.reset(job);
	job->start();
}

void NewsChecker::rssDownloadFinished()
{
	// Parse the XML file and process the RSS feed entries.
	qDebug() << "Finished loading RSS feed.";

	m_newsNetJob.reset();
	QDomDocument doc;
	{
		// Stuff to store error info in.
		QString errorMsg = "Unknown error.";
		int errorLine = -1;
		int errorCol = -1;

		// Parse the XML.
		if (!doc.setContent(newsData, false, &errorMsg, &errorLine,
							&errorCol)) {
			QString fullErrorMsg =
				QString("Error parsing RSS feed XML. %1 at %2:%3.")
					.arg(errorMsg)
					.arg(errorLine)
					.arg(errorCol);
			fail(fullErrorMsg);
			newsData.clear();
			return;
		}
		newsData.clear();
	}

	// If the parsing succeeded, read it.
	QDomNodeList items = doc.elementsByTagName("item");
	m_newsEntries.clear();
	for (int i = 0; i < items.length(); i++) {
		QDomElement element = items.at(i).toElement();
		NewsEntryPtr entry;
		entry.reset(new NewsEntry());
		QString errorMsg = "An unknown error occurred.";
		if (NewsEntry::fromXmlElement(element, entry.get(), &errorMsg)) {
			qDebug() << "Loaded news entry" << entry->title;
			m_newsEntries.append(entry);
		} else {
			qWarning() << "Failed to load news entry at index" << i << ":"
					   << errorMsg;
		}
	}

	succeed();
}

void NewsChecker::rssDownloadFailed(QString reason)
{
	// Set an error message and fail.
	fail(tr("Failed to load news RSS feed:\n%1").arg(reason));
}

QList<NewsEntryPtr> NewsChecker::getNewsEntries() const
{
	return m_newsEntries;
}

bool NewsChecker::isLoadingNews() const
{
	return m_newsNetJob.get() != nullptr;
}

QString NewsChecker::getLastLoadErrorMsg() const
{
	return m_lastLoadError;
}

void NewsChecker::succeed()
{
	m_lastLoadError = "";
	qDebug() << "News loading succeeded.";
	m_newsNetJob.reset();
	emit newsLoaded();
}

void NewsChecker::fail(const QString& errorMsg)
{
	m_lastLoadError = errorMsg;
	qDebug() << "Failed to load news:" << errorMsg;
	m_newsNetJob.reset();
	emit newsLoadingFailed(errorMsg);
}