#include "MetaCacheSink.h"
#include <QFile>
#include <QFileInfo>
#include "Env.h"
#include "FileSystem.h"

namespace Net {

MetaCacheSink::MetaCacheSink(MetaEntryPtr entry, ChecksumValidator * md5sum)
	:Net::FileSink(entry->getFullPath()), m_entry(entry), m_md5Node(md5sum)
{
	addValidator(md5sum);
};

MetaCacheSink::~MetaCacheSink()
{
	// nil
};

Task::Status MetaCacheSink::initCache(QNetworkRequest& request)
{
	if (!m_entry->isStale())
	{
		return Task::Status::Finished;
	}
	// check if file exists, if it does, use its information for the request
	QFile current(m_filename);
	if(current.exists() && current.size() != 0)
	{
		if (m_entry->getRemoteChangedTimestamp().size())
		{
			request.setRawHeader(QString("If-Modified-Since").toLatin1(), m_entry->getRemoteChangedTimestamp().toLatin1());
		}
		if (m_entry->getETag().size())
		{
			request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->getETag().toLatin1());
		}
	}
	return Task::Status::InProgress;
}

Task::Status MetaCacheSink::finalizeCache(QNetworkReply & reply)
{
	QFileInfo output_file_info(m_filename);
	if(wroteAnyData)
	{
		m_entry->setMD5Sum(m_md5Node->hash().toHex().constData());
	}
	m_entry->setETag(reply.rawHeader("ETag").constData());
	if (reply.hasRawHeader("Last-Modified"))
	{
		m_entry->setRemoteChangedTimestamp(reply.rawHeader("Last-Modified").constData());
	}
	m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch());
	m_entry->setStale(false);
	ENV.metacache()->updateEntry(m_entry);
	return Task::Status::Finished;
}

bool MetaCacheSink::hasLocalData()
{
	QFileInfo info(m_filename);
	return info.exists() && info.size() != 0;
}
}