#include "FtbPackFetchTask.h"
#include <QDomDocument>

FtbPackFetchTask::FtbPackFetchTask()
{
}

FtbPackFetchTask::~FtbPackFetchTask()
{
}

void FtbPackFetchTask::fetch()
{
	NetJob *netJob = new NetJob("FtbModpackFetch");

	QUrl publicPacksUrl = QUrl("https://ftb.cursecdn.com/FTB2/static/modpacks.xml");
	qDebug() << "Downloading public version info from" << publicPacksUrl.toString();
	netJob->addNetAction(Net::Download::makeByteArray(publicPacksUrl, &publicModpacksXmlFileData));

	QUrl thirdPartyUrl = QUrl("https://ftb.cursecdn.com/FTB2/static/thirdparty.xml");
	qDebug() << "Downloading thirdparty version info from" << thirdPartyUrl.toString();
	netJob->addNetAction(Net::Download::makeByteArray(thirdPartyUrl, &thirdPartyModpacksXmlFileData));

	QObject::connect(netJob, &NetJob::succeeded, this, &FtbPackFetchTask::fileDownloadFinished);
	QObject::connect(netJob, &NetJob::failed, this, &FtbPackFetchTask::fileDownloadFailed);

	jobPtr.reset(netJob);
	netJob->start();
}

void FtbPackFetchTask::fileDownloadFinished()
{
	jobPtr.reset();

	QStringList failedLists;

	if(!parseAndAddPacks(publicModpacksXmlFileData, FtbPackType::Public, publicPacks)) {
		failedLists.append(tr("Public Packs"));
	}

	if(!parseAndAddPacks(thirdPartyModpacksXmlFileData, FtbPackType::ThirdParty, thirdPartyPacks)) {
		failedLists.append(tr("Third Party Packs"));
	}

	if(failedLists.size() > 0) {
		emit failed(QString("Failed to download some pack lists:%1").arg(failedLists.join("\n- ")));
	} else {
		emit finished(publicPacks, thirdPartyPacks);
	}
}

bool FtbPackFetchTask::parseAndAddPacks(QByteArray &data, FtbPackType packType, FtbModpackList &list)
{
	QDomDocument doc;

	QString errorMsg = "Unknown error.";
	int errorLine = -1;
	int errorCol = -1;

	if(!doc.setContent(data, false, &errorMsg, &errorLine, &errorCol)){
		auto fullErrMsg = QString("Failed to fetch modpack data: %s %d:%d!").arg(errorMsg, errorLine, errorCol);
		qWarning() << fullErrMsg;
		data.clear();
		return false;
	}

	QDomNodeList nodes = doc.elementsByTagName("modpack");
	for(int i = 0; i < nodes.length(); i++) {
		QDomElement element = nodes.at(i).toElement();

		FtbModpack modpack;
		modpack.name = element.attribute("name");
		modpack.currentVersion = element.attribute("version");
		modpack.mcVersion = element.attribute("mcVersion");
		modpack.description = element.attribute("description");
		modpack.mods = element.attribute("mods");
		modpack.logo = element.attribute("logo");
		modpack.oldVersions = element.attribute("oldVersions").split(";");
		modpack.broken = false;
		modpack.bugged = false;

		//remove empty if the xml is bugged
		for(QString curr : modpack.oldVersions) {
			if(curr.isNull() || curr.isEmpty()) {
				modpack.oldVersions.removeAll(curr);
				modpack.bugged = true;
				qWarning() << "Removed some empty versions from" << modpack.name;
			}
		}

		if(modpack.oldVersions.size() < 1) {
			if(!modpack.currentVersion.isNull() && !modpack.currentVersion.isEmpty()) {
				modpack.oldVersions.append(modpack.currentVersion);
				qWarning() << "Added current version to oldVersions because oldVersions was empty! (" + modpack.name + ")";
			} else {
				modpack.broken = true;
				qWarning() << "Broken pack:" << modpack.name << " => No valid version!";
			}
		}

		modpack.author = element.attribute("author");

		modpack.dir = element.attribute("dir");
		modpack.file = element.attribute("url");

		modpack.type = packType;

		list.append(modpack);
	}

	return true;
}

void FtbPackFetchTask::fileDownloadFailed(QString reason){
	qWarning() << "Fetching FtbPacks failed: " << reason;
	emit failed(reason);
}