/* ============================================================
 *
 * This file is a part of kipi-plugins project
 * http://www.digikam.org
 *
 * Date        : 2006-04-04
 * Description : A KIPI plugin to generate HTML image galleries
 *
 * Copyright (C) 2006-2010 by Aurelien Gateau <aurelien dot gateau at free.fr>
 *
 * This program 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 2, or (at your option) any later version.
 *
 * This program 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.
 *
 * ============================================================ */

// vim: set tabstop=4 shiftwidth=4 noexpandtab:

#include "imagegenerationfunctor.h"

// Qt includes

#include <QFile>
#include <QFileInfo>
#include <QImage>
#include <QImageReader>

// KDE includes

#include <klocale.h>
#include <kdebug.h>

// LibKIPI includes

#include <libkipi/interface.h>

// LibKDcraw includes

#include <libkdcraw/dcrawinfocontainer.h>
#include <libkdcraw/version.h>
#include <libkdcraw/kdcraw.h>

// Local includes

#include "galleryinfo.h"
#include "generator.h"
#include "imageelement.h"
#include "kpmetadata.h"

using namespace KDcrawIface;

namespace KIPIHTMLExport
{

/**
 * Genearate a thumbnail from @fullImage of @size x @size pixels
 * If square == true, crop the result to a square
 */
static QImage generateThumbnail(const QImage& fullImage, int size, bool square)
{
    QImage image = fullImage.scaled(size, size, square ? Qt::KeepAspectRatioByExpanding
                                                       : Qt::KeepAspectRatio,
                                    Qt::SmoothTransformation);

    if (square && (image.width() != size || image.height() != size))
    {
        int sx=0, sy=0;
        if (image.width() > size)
        {
            sx=(image.width() - size) / 2;
        } else {
            sy=(image.height() - size) / 2;
        }
        image = image.copy(sx, sy, size, size);
    }

    return image;
}

ImageGenerationFunctor::ImageGenerationFunctor(Generator* generator, GalleryInfo* info, const QString& destDir)
    : mGenerator(generator), mInfo(info), mDestDir(destDir)
{
}

void ImageGenerationFunctor::operator()(ImageElement& element)
{
    // Load image
    QString path = element.mPath;
    QFile imageFile(path);
    if (!imageFile.open(QIODevice::ReadOnly))
    {
        emitWarning(i18n("Could not read image '%1'", path));
        return;
    }

    QImage     originalImage;
    QString    imageFormat;
    QByteArray imageData;

    // Check if RAW file.
    if (KPMetadata::isRawFile(path))
    {
        if (!KDcraw::loadDcrawPreview(originalImage, path))
        {
            emitWarning(i18n("Error loading RAW image '%1'", path));
            return;
        }
    }
    else
    {
        imageFormat = QImageReader::imageFormat(&imageFile);
        if (imageFormat.isEmpty())
        {
            emitWarning(i18n("Format of image '%1' is unknown", path));
            return;
        }
        imageFile.close();
        imageFile.open(QIODevice::ReadOnly);

        imageData = imageFile.readAll();

        if (!originalImage.loadFromData(imageData) )
        {
            emitWarning(i18n("Error loading image '%1'", path));
            return;
        }
    }

    // Process images
    QImage fullImage = originalImage;
    if (!mInfo->useOriginalImageAsFullImage())
    {
        if (mInfo->fullResize())
        {
            int size  = mInfo->fullSize();
            fullImage = fullImage.scaled(size, size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
        }

        if (element.mOrientation != KPMetadata::ORIENTATION_UNSPECIFIED )
        {
            QMatrix matrix = RotationMatrix::toMatrix(element.mOrientation);
            fullImage      = fullImage.transformed(matrix);
        }
    }

    QImage thumbnail = generateThumbnail(fullImage, mInfo->thumbnailSize(), mInfo->thumbnailSquare());

    // Save images
    QString baseFileName = Generator::webifyFileName(element.mTitle);
    baseFileName = mUniqueNameHelper.makeNameUnique(baseFileName);

    // Save full
    QString fullFileName;
    if (mInfo->useOriginalImageAsFullImage())
    {
        fullFileName = baseFileName + '.' + imageFormat.toLower();
        if (!writeDataToFile(imageData, mDestDir + '/' + fullFileName))
        {
            return;
        }

    }
    else
    {
        fullFileName = baseFileName + '.' + mInfo->fullFormatString().toLower();
        QString destPath = mDestDir + '/' + fullFileName;
        if (!fullImage.save(destPath, mInfo->fullFormatString().toAscii(), mInfo->fullQuality()))
        {
            emitWarning(i18n("Could not save image '%1' to '%2'", path, destPath));
            return;
        }
    }
    element.mFullFileName = fullFileName;
    element.mFullSize = fullImage.size();

    // Save original
    if (mInfo->copyOriginalImage())
    {
        QString originalFileName = "original_" + fullFileName;
        if (!writeDataToFile(imageData, mDestDir + '/' + originalFileName))
        {
            return;
        }
        element.mOriginalFileName = originalFileName;
        element.mOriginalSize = originalImage.size();
    }

    // Save thumbnail
    QString thumbnailFileName = "thumb_" + baseFileName + '.' + mInfo->thumbnailFormatString().toLower();
    QString destPath = mDestDir + '/' + thumbnailFileName;
    if (!thumbnail.save(destPath, mInfo->thumbnailFormatString().toAscii(), mInfo->thumbnailQuality()))
    {
        mGenerator->logWarningRequested(i18n("Could not save thumbnail for image '%1' to '%2'", path, destPath));
        return;
    }
    element.mThumbnailFileName = thumbnailFileName;
    element.mThumbnailSize = thumbnail.size();

    element.mValid = true;

    // Read Exif Metadata
    QString unavailable(i18n("unavailable"));
    KPMetadata meta;
    meta.load(path);
    if (meta.hasExif() || meta.hasXmp())
    {
        // Try to use image metadata to get image info

        element.mExifImageMake = meta.getExifTagString("Exif.Image.Make");
        if (element.mExifImageMake.isEmpty())
        {
            element.mExifImageMake = meta.getXmpTagString("Xmp.tiff.Make");
        }

        element.mExifImageModel = meta.getExifTagString("Exif.Image.Model");
        if (element.mExifImageModel.isEmpty())
        {
            element.mExifImageModel = meta.getXmpTagString("Xmp.tiff.Model");
        }

        element.mExifImageOrientation = meta.getExifTagString("Exif.Image.Orientation");
        if (element.mExifImageOrientation.isEmpty())
        {
            element.mExifImageOrientation = meta.getXmpTagString("Xmp.tiff.Orientation");
        }

        element.mExifImageXResolution = meta.getExifTagString("Exif.Image.XResolution");
        if (element.mExifImageXResolution.isEmpty())
        {
            element.mExifImageXResolution = meta.getXmpTagString("Xmp.tiff.XResolution");
        }

        element.mExifImageYResolution = meta.getExifTagString("Exif.Image.YResolution");
        if (element.mExifImageYResolution.isEmpty())
        {
            element.mExifImageYResolution = meta.getXmpTagString("Xmp.tiff.YResolution");
        }

        element.mExifImageResolutionUnit = meta.getExifTagString("Exif.Image.ResolutionUnit");
        if (element.mExifImageResolutionUnit.isEmpty())
        {
            element.mExifImageResolutionUnit = meta.getXmpTagString("Xmp.tiff.ResolutionUnit");
        }

        if (meta.getImageDateTime().isValid())
        {
            element.mExifImageDateTime = KGlobal::locale()->formatDateTime(meta.getImageDateTime(),
                                                                            KLocale::ShortDate, true);
        }

        element.mExifImageYCbCrPositioning = meta.getExifTagString("Exif.Image.YCbCrPositioning");
        if (element.mExifImageYCbCrPositioning.isEmpty())
        {
            element.mExifImageYCbCrPositioning = meta.getXmpTagString("Xmp.tiff.YCbCrPositioning");
        }

        element.mExifPhotoFNumber = meta.getExifTagString("Exif.Photo.FNumber");
        if (element.mExifPhotoFNumber.isEmpty())
        {
            element.mExifPhotoFNumber = meta.getXmpTagString("Xmp.exif.FNumber");
        }

        element.mExifPhotoApertureValue = meta.getExifTagString("Exif.Photo.ApertureValue");
        if (element.mExifPhotoApertureValue.isEmpty())
        {
            element.mExifPhotoApertureValue = meta.getXmpTagString("Xmp.exif.ApertureValue");
        }

        element.mExifPhotoFocalLength = meta.getExifTagString("Exif.Photo.FocalLength");
        if (element.mExifPhotoFocalLength.isEmpty())
        {
            element.mExifPhotoFocalLength = meta.getXmpTagString("Xmp.exif.FocalLength");
        }

        element.mExifPhotoExposureTime = meta.getExifTagString("Exif.Photo.ExposureTime");
        if (element.mExifPhotoExposureTime.isEmpty())
        {
            element.mExifPhotoExposureTime = meta.getXmpTagString("Xmp.exif.ExposureTime");
        }

        element.mExifPhotoShutterSpeedValue = meta.getExifTagString("Exif.Photo.ShutterSpeedValue");
        if (element.mExifPhotoShutterSpeedValue.isEmpty())
        {
            element.mExifPhotoShutterSpeedValue = meta.getXmpTagString("Xmp.exif.ShutterSpeedValue");
        }

        element.mExifPhotoISOSpeedRatings = meta.getExifTagString("Exif.Photo.ISOSpeedRatings");
        if (element.mExifPhotoISOSpeedRatings.isEmpty())
        {
            element.mExifPhotoISOSpeedRatings = meta.getXmpTagString("Xmp.exif.ISOSpeedRatings");
        }

        element.mExifPhotoExposureProgram = meta.getExifTagString("Exif.Photo.ExposureIndex");
        if (element.mExifPhotoExposureProgram.isEmpty())
        {
            element.mExifPhotoExposureProgram = meta.getXmpTagString("Xmp.exif.ExposureIndex");
        }

        // Get GPS values
        double gpsvalue;
        if (meta.getGPSAltitude(&gpsvalue))
        {
            element.mExifGPSAltitude = QString::number(gpsvalue,'f',3);
        }

        if (meta.getGPSLatitudeNumber(&gpsvalue))
        {
            element.mExifGPSLatitude = QString::number(gpsvalue,'f',6);
        }

        if (meta.getGPSLongitudeNumber(&gpsvalue))
        {
            element.mExifGPSLongitude = QString::number(gpsvalue,'f',6);
        }
    }
    else
    {
        // Try to use libkdcraw interface to identify image.

        DcrawInfoContainer info;
        KDcraw             dcrawIface;
        dcrawIface.rawFileIdentify(info, path);

        if (info.isDecodable)
        {
            if (!info.make.isEmpty())
                element.mExifImageMake = info.make;

            if (!info.model.isEmpty())
                element.mExifImageModel = info.model;

            if (info.dateTime.isValid())
                element.mExifImageDateTime = KGlobal::locale()->formatDateTime(info.dateTime, KLocale::ShortDate, true);

            if (info.aperture != -1.0)
                element.mExifPhotoApertureValue = QString::number(info.aperture);

            if (info.focalLength != -1.0)
                element.mExifPhotoFocalLength = QString::number(info.focalLength);

            if (info.exposureTime != -1.0)
                element.mExifPhotoExposureTime = QString::number(info.exposureTime);

            if (info.sensitivity != -1)
                element.mExifPhotoISOSpeedRatings = QString::number(info.sensitivity);
        }
    }

    if (element.mExifImageMake.isEmpty()) element.mExifImageMake = unavailable;

    if (element.mExifImageModel.isEmpty()) element.mExifImageModel   = unavailable;

    if (element.mExifImageOrientation.isEmpty()) element.mExifImageOrientation = unavailable;

    if (element.mExifImageXResolution.isEmpty()) element.mExifImageXResolution = unavailable;

    if (element.mExifImageYResolution.isEmpty()) element.mExifImageYResolution = unavailable;

    if (element.mExifImageResolutionUnit.isEmpty()) element.mExifImageResolutionUnit = unavailable;

    if (element.mExifImageDateTime.isEmpty()) element.mExifImageDateTime = unavailable;

    if (element.mExifImageYCbCrPositioning.isEmpty()) element.mExifImageYCbCrPositioning = unavailable;

    if (element.mExifPhotoApertureValue.isEmpty()) element.mExifPhotoApertureValue   = unavailable;

    if (element.mExifPhotoFocalLength.isEmpty()) element.mExifPhotoFocalLength   = unavailable;

    if (element.mExifPhotoFNumber.isEmpty()) element.mExifPhotoFNumber   = unavailable;

    if (element.mExifPhotoExposureTime.isEmpty()) element.mExifPhotoExposureTime = unavailable;

    if (element.mExifPhotoShutterSpeedValue.isEmpty()) element.mExifPhotoShutterSpeedValue = unavailable;

    if (element.mExifPhotoISOSpeedRatings.isEmpty()) element.mExifPhotoISOSpeedRatings   = unavailable;

    if (element.mExifPhotoExposureProgram.isEmpty()) element.mExifPhotoExposureProgram   = unavailable;

    if (element.mExifGPSAltitude.isEmpty()) element.mExifGPSAltitude = unavailable;

    if (element.mExifGPSLatitude.isEmpty()) element.mExifGPSLatitude = unavailable;

    if (element.mExifGPSLongitude.isEmpty()) element.mExifGPSLongitude = unavailable;
}

bool ImageGenerationFunctor::writeDataToFile(const QByteArray& data, const QString& destPath)
{
    QFile destFile(destPath);
    if (!destFile.open(QIODevice::WriteOnly))
    {
        emitWarning(i18n("Could not open file '%1' for writing", destPath));
        return false;
    }
    if (destFile.write(data) != data.size())
    {
        emitWarning(i18n("Could not save image to file '%1'", destPath));
        return false;
    }
    return true;
}

void ImageGenerationFunctor::emitWarning(const QString& message)
{
    emit (mGenerator->logWarningRequested(message));
}

} // namespace KIPIHTMLExport