/*
 * Copyright (C) 2015-2018 Département de l'Instruction Publique (DIP-SEM)
 *
 * Copyright (C) 2013 Open Education Foundation
 *
 * Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
 * l'Education Numérique en Afrique (GIP ENA)
 *
 * This file is part of OpenBoard.
 *
 * OpenBoard 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, version 3 of the License,
 * with a specific linking exception for the OpenSSL project's
 * "OpenSSL" library (or with modified versions of it that use the
 * same license as the "OpenSSL" library).
 *
 * OpenBoard 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 OpenBoard. If not, see <http://www.gnu.org/licenses/>.
 */




#include "XPDFRenderer.h"

#include <QtGui>

#include <frameworks/UBPlatformUtils.h>

#include "core/memcheck.h"

QAtomicInt XPDFRenderer::sInstancesCount = 0;

XPDFRenderer::XPDFRenderer(const QString &filename, bool importingFile)
    : mDocument(0)
    , mpSplashBitmap(0)
    , mSplash(0)
{
    Q_UNUSED(importingFile);
    if (!globalParams)
    {
        // globalParams must be allocated once and never be deleted
        // note that this is *not* an instance variable of this XPDFRenderer class
        globalParams = new GlobalParams(0);
        globalParams->setupBaseFonts(QFile::encodeName(UBPlatformUtils::applicationResourcesDirectory() + "/" + "fonts").data());
    }

    mDocument = new PDFDoc(new GString(filename.toLocal8Bit()), 0, 0, 0); // the filename GString is deleted on PDFDoc desctruction
    sInstancesCount.ref();
}

XPDFRenderer::~XPDFRenderer()
{
    if(mSplash){
        delete mSplash;
        mSplash = NULL;
    }

    if (mDocument)
    {
        delete mDocument;
        sInstancesCount.deref();
    }

    if (sInstancesCount.loadAcquire() == 0 && globalParams)
    {
        delete globalParams;
        globalParams = 0;
    }
}

bool XPDFRenderer::isValid() const
{
    if (mDocument)
    {
        return mDocument->isOk();
    }
    else
    {
        return false;
    }
}

int XPDFRenderer::pageCount() const
{
    if (isValid())
        return mDocument->getNumPages();
    else
        return 0;
}

QString XPDFRenderer::title() const
{
    if (isValid())
    {
        Object pdfInfo;
        mDocument->getDocInfo(&pdfInfo);
        if (pdfInfo.isDict())
        {
            Object title;
            Dict *infoDict = pdfInfo.getDict();
            if (infoDict->lookup((char*)"Title", &title)->isString())
            {
                GString *gstring = title.getString();
                return QString(gstring->getCString());
            }
        }
    }

    return QString();
}


QSizeF XPDFRenderer::pageSizeF(int pageNumber) const
{
    qreal cropWidth = 0;
    qreal cropHeight = 0;

    if (isValid())
    {
        int rotate = mDocument->getPageRotate(pageNumber);

        cropWidth = mDocument->getPageCropWidth(pageNumber) * this->dpiForRendering / 72.0;
        cropHeight = mDocument->getPageCropHeight(pageNumber) * this->dpiForRendering / 72.0;

        if (rotate == 90 || rotate == 270)
        {
            //switching width and height
            qreal tmpVar = cropWidth;
            cropWidth = cropHeight;
            cropHeight = tmpVar;
        }
    }
    return QSizeF(cropWidth, cropHeight);
}


int XPDFRenderer::pageRotation(int pageNumber) const
{
    if (mDocument)
        return  mDocument->getPageRotate(pageNumber);
    else
        return 0;
}

void XPDFRenderer::render(QPainter *p, int pageNumber, const QRectF &bounds)
{
    if (isValid())
    {
        qreal xscale = p->worldTransform().m11();
        qreal yscale = p->worldTransform().m22();

        QImage *pdfImage = createPDFImage(pageNumber, xscale, yscale, bounds);
        QTransform savedTransform = p->worldTransform();
        p->resetTransform();
        p->drawImage(QPointF(savedTransform.dx() + mSliceX, savedTransform.dy() + mSliceY), *pdfImage);
        p->setWorldTransform(savedTransform);
        delete pdfImage;
    }
}

QImage* XPDFRenderer::createPDFImage(int pageNumber, qreal xscale, qreal yscale, const QRectF &bounds)
{
    if (isValid())
    {
        SplashColor paperColor = {0xFF, 0xFF, 0xFF}; // white
        if(mSplash)
            delete mSplash;
        mSplash = new SplashOutputDev(splashModeRGB8, 1, gFalse, paperColor);
        mSplash->startDoc(mDocument->getXRef());
        int rotation = 0; // in degrees (get it from the worldTransform if we want to support rotation)
        GBool useMediaBox = gFalse;
        GBool crop = gTrue;
        GBool printing = gFalse;
        mSliceX = 0.;
        mSliceY = 0.;

        if (bounds.isNull())
        {
            mDocument->displayPage(mSplash, pageNumber, this->dpiForRendering * xscale, this->dpiForRendering *yscale,
                                   rotation, useMediaBox, crop, printing);
        }
        else
        {
            mSliceX = bounds.x() * xscale;
            mSliceY = bounds.y() * yscale;
            qreal sliceW = bounds.width() * xscale;
            qreal sliceH = bounds.height() * yscale;

            mDocument->displayPageSlice(mSplash, pageNumber, this->dpiForRendering * xscale, this->dpiForRendering * yscale,
                rotation, useMediaBox, crop, printing, mSliceX, mSliceY, sliceW, sliceH);
        }

        mpSplashBitmap = mSplash->getBitmap();
    }
    return new QImage(mpSplashBitmap->getDataPtr(), mpSplashBitmap->getWidth(), mpSplashBitmap->getHeight(), mpSplashBitmap->getWidth() * 3, QImage::Format_RGB888);
}
