#include <QApplication>
#include <QScreen>
#include <QDebug>
#include "pdfworker.h"

PdfWorker::PdfWorker()
{
}

Poppler::Document *PdfWorker::document(QString path)
{
	if(this->documentcache.contains(path))
		return this->documentcache.value(path);

	Poppler::Document *result = Poppler::Document::load(path);
	if(result == nullptr)
	{
		return nullptr;
	}
	result->setRenderHint(Poppler::Document::TextAntialiasing);
	this->documentcache.insert(path, result);
	return result;
}
void PdfWorker::generatePreviews(QVector<SearchResult> paths, double scalefactor)
{
	this->cancelCurrent = false;
	this->generating = true;
	for(SearchResult &sr : paths)
	{
		if(this->cancelCurrent.load())
		{
			break;
		}
		Poppler::Document *doc = document(sr.fileData.absPath);
		if(doc == nullptr)
		{
			continue;
		}
		if(doc->isLocked())
		{
			continue;
		}
		int p = (int)sr.page - 1;
		if(p < 0)
			p = 0;
		Poppler::Page *pdfpage = doc->page(p);
		QImage image = pdfpage->renderToImage(QGuiApplication::primaryScreen()->physicalDotsPerInchX() * scalefactor,
											  QGuiApplication::primaryScreen()->physicalDotsPerInchY() * scalefactor);

		PdfPreview preview;
		preview.previewImage = image;
		preview.documentPath = sr.fileData.absPath;
		preview.page = sr.page;
		emit previewReady(preview);
	}
	isFreeMutex.lock();
	isFree.wakeOne();
	isFreeMutex.unlock();
	generating = false;
	emit previewsFinished();
}

void PdfWorker::cancelAndWait()
{
	if(this->generating.load())
	{
		this->cancelCurrent = true;

		isFreeMutex.lock();
		isFree.wait(&isFreeMutex);
		isFreeMutex.unlock();
	}
}