/*******************************************************************************************************
 DkPageExtractionPlugin.cpp

 nomacs is a fast and small image viewer with the capability of synchronizing multiple instances

 Copyright (C) 2015 Markus Diem

 This file is part of nomacs.

 nomacs 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.

 nomacs 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 <http://www.gnu.org/licenses/>.

 *******************************************************************************************************/

#include "DkPageExtractionPlugin.h"

#include "DkPageSegmentation.h"

#include "DkImageStorage.h"
#include "DkMetaData.h"
#include "DkTimer.h"

#include <QAction>
#include <QDir>
#include <QFileInfo>
#include <QPainter>
#include <QSettings>
#include <QUuid>
#include <QXmlStreamReader>

namespace nmp
{

/**
 *	Constructor
 **/
DkPageExtractionPlugin::DkPageExtractionPlugin(QObject *parent)
    : QObject(parent)
{
    // create run IDs
    QVector<QString> runIds;
    runIds.resize(id_end);

    for (int idx = 0; idx < id_end; idx++)
        runIds[idx] = QUuid::createUuid().toString();
    mRunIDs = runIds.toList();

    // create menu actions
    QVector<QString> menuNames;
    menuNames.resize(id_end);

    menuNames[id_crop_to_page] = tr("Crop to Page");
    menuNames[id_crop_to_metadata] = tr("Crop to Metadata");
    menuNames[id_draw_to_page] = tr("Draw to Page");
    // menuNames[id_eval_page] = tr("Evaluate Page");
    mMenuNames = menuNames.toList();

    // create menu status tips
    QVector<QString> statusTips;
    statusTips.resize(id_end);

    statusTips[id_crop_to_page] = tr("Finds a page in a document image and then crops the image to that page.");
    statusTips[id_crop_to_metadata] = tr(
        "Finds a page in a document image and then saves the coordinates to the XMP metadata.");
    statusTips[id_draw_to_page] = tr("Finds a page in a document image and then draws the found document boundaries.");
    // statusTips[id_eval_page] = tr("Loads GT and computes the Jaccard index.");
    mMenuStatusTips = statusTips.toList();

    // QFileInfo resPath(QDir("dmrz/numerical-results/"), "results-" + QDateTime::currentDateTime().toString("yyyy-MM-dd
    // HH-mm-ss") + ".txt"); mResultPath = resPath.absoluteFilePath();
}

/**
 *	Destructor
 **/
DkPageExtractionPlugin::~DkPageExtractionPlugin() = default;

QImage DkPageExtractionPlugin::image() const
{
    return QImage(":/PageExtractionPlugin/img/page-extraction.png");
};

QString DkPageExtractionPlugin::name() const
{
    return "Page Extraction Plugin";
}

QList<QAction *> DkPageExtractionPlugin::createActions(QWidget *parent)
{
    if (mActions.empty()) {
        for (int idx = 0; idx < id_end; idx++) {
            auto *ca = new QAction(mMenuNames[idx], parent);
            ca->setObjectName(mMenuNames[idx]);
            ca->setStatusTip(mMenuStatusTips[idx]);
            ca->setData(mRunIDs[idx]); // runID needed for calling function runPlugin()
            mActions.append(ca);
        }
    }

    return mActions;
}

QList<QAction *> DkPageExtractionPlugin::pluginActions() const
{
    return mActions;
}

/**
 * Main function: runs plugin based on its ID
 * @param plugin ID
 * @param image to be processed
 **/
QSharedPointer<nmc::DkImageContainer> DkPageExtractionPlugin::runPlugin(
    const QString &runID,
    QSharedPointer<nmc::DkImageContainer> imgC,
    const nmc::DkSaveInfo &saveInfo,
    QSharedPointer<nmc::DkBatchInfo> &batchInfo) const
{
    Q_UNUSED(saveInfo);
    Q_UNUSED(batchInfo);

    if (!mRunIDs.contains(runID) || !imgC)
        return imgC;

    cv::Mat img = nmc::DkImage::qImage2Mat(imgC->image());
    bool alternativeMethod = mMethod == m_bhaskar;

    DkPageSegmentation segM(img, alternativeMethod);

    // run the page segmentation
    nmc::DkTimer dt;
    segM.compute();
    segM.filterDuplicates();
    qDebug() << "page segmentation takes" << dt;

    // crop image
    if (runID == mRunIDs[id_crop_to_page]) {
        imgC->setImage(segM.getCropped(imgC->image()), tr("Page Cropped"));
    }
    // save to metadata
    else if (runID == mRunIDs[id_crop_to_metadata]) {
        if (segM.getRects().empty())
            imgC = QSharedPointer<nmc::DkImageContainer>(); // notify parent
        else {
            nmc::DkRotatingRect rect = segM.getMaxRect().toRotatingRect();

            QSharedPointer<nmc::DkMetaDataT> m = imgC->getMetaData();
            m->saveRectToXMP(rect, imgC->image().size());
        }
    }
    // draw rectangles to the image
    else if (runID == mRunIDs[id_draw_to_page]) {
        QImage dImg = imgC->image();
        segM.draw(dImg);
        imgC->setImage(dImg, tr("Page Annotated"));
    }
    // else if (runID == mRunIDs[id_eval_page]) {

    //	QImage dImg = imgC->image();

    //	QPolygonF gt = readGT(imgC->filePath());
    //
    //	QPen mPen(QColor(100, 200, 50));
    //	mPen.setWidth(10);
    //	QPainter p(&dImg);
    //	p.setPen(mPen);
    //	p.drawPolygon(gt);
    //	p.end();

    //	segM.draw(dImg);
    //	imgC->setImage(dImg, tr("Result vs GT"));

    //	double ji = jaccardIndex(imgC->image().size(), gt, segM.getMaxRect().toPolygon());

    //	QString data = imgC->fileName() + ", " + QString::number(ji) + "\n";
    //	qDebug() << data;

    //	QFile file(mResultPath);
    //	file.open(QIODevice::WriteOnly | QIODevice::Append);
    //	QTextStream stream(&file);
    //	stream << data;
    //	qInfo() << "results written to" << mResultPath;

    //}

    // wrong runID? - do nothing
    return imgC;
}

void DkPageExtractionPlugin::loadSettings(QSettings &settings)
{
    settings.beginGroup(name());

    // we need valid default settings for Batch, but saveSettings() will never be called
    int mIdx = settings.value("Method", -1).toInt();

    bool reset = false;
    if (mIdx < 0 || mIdx >= m_end) {
        mIdx = 0;
        reset = true;
    }
    mMethod = (MethodIndex)mIdx;

    settings.endGroup();

    if (reset)
        saveSettings(settings);
}

void DkPageExtractionPlugin::saveSettings(QSettings &settings) const
{
    settings.beginGroup(name());
    settings.setValue("Method", mMethod);
    settings.endGroup();
}

QPolygonF DkPageExtractionPlugin::readGT(const QString &imgPath) const
{
    QFileInfo imgInfo(imgPath);

    QFileInfo xmlFileI(imgInfo.absolutePath(), imgInfo.baseName() + ".xml");

    if (!xmlFileI.exists()) {
        qWarning() << "no xml file found: " << xmlFileI.absoluteFilePath();
        return QPolygonF();
    }
    QFile xmlFile(xmlFileI.absoluteFilePath());
    if (!xmlFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qWarning() << "could not load" << xmlFileI.absoluteFilePath();
        return QPolygonF();
    }

    QXmlStreamReader xmlReader(&xmlFile);
    QPolygonF rect;

    while (!xmlReader.atEnd() && !xmlReader.hasError()) {
        QString tag = xmlReader.qualifiedName().toString();

        if (xmlReader.tokenType() == QXmlStreamReader::StartElement && tag == "dmrz") {
            for (int idx = 0; idx < 4; idx++) {
                QPoint p;
                p.setX(xmlReader.attributes().value("x" + QString::number(idx)).toInt());
                p.setY(xmlReader.attributes().value("y" + QString::number(idx)).toInt());
                rect << p;
            }
        }
        xmlReader.readNext();
    }

    return rect;
}

double DkPageExtractionPlugin::jaccardIndex(const QSize &imgSize, const QPolygonF &gt, const QPolygonF &computed) const
{
    cv::Mat gtImg = nmc::DkImage::qImage2Mat(drawPoly(imgSize, gt));
    cv::Mat evImg = nmc::DkImage::qImage2Mat(drawPoly(imgSize, computed));

    double andVal = (double)cv::sum(gtImg & evImg)[0];
    double orVal = (double)cv::sum(gtImg | evImg)[0];

    return andVal / orVal;
}

QImage DkPageExtractionPlugin::drawPoly(const QSize &imgSize, const QPolygonF &poly) const
{
    QImage img(imgSize, QImage::Format_RGB888);
    img.fill(QColor(0, 0, 0));

    QPainter pg(&img);
    pg.setBrush(QColor(255, 255, 255));
    pg.drawPolygon(poly);

    return img;
}

};
