/*
 *   Copyright (C) 2007 Tobias Koenig <tokoe@kde.org>
 *   Copyright  2008 by Anne-Marie Mahfouf <annma@kde.org>
 *   Copyright  2008 by Georges Toth <gtoth@trypill.org>
 *
 *   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 of the License, 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
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "flickrprovider.h"

#include <QtCore/QDate>
#include <QtCore/QRegExp>
#include <QtGui/QImage>
#include <QXmlStreamReader>

#include <KDebug>
#include <kio/job.h>

POTDPROVIDER_EXPORT_PLUGIN( FlickrProvider, "FlickrProvider", "" )

class FlickrProvider::Private
{
  public:
    Private( FlickrProvider *parent )
      : mParent( parent )
    {
        qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
    }

    void pageRequestFinished( KJob* );
    void imageRequestFinished( KJob* );
    void parsePage();

    FlickrProvider *mParent;
    QByteArray mPage;
    QDate mDate;
    QDate mActualDate;
    QImage mImage;

    QXmlStreamReader xml;

  private:
    QStringList m_photoList;
};

void FlickrProvider::Private::pageRequestFinished( KJob *_job )
{
    KIO::StoredTransferJob *job = static_cast<KIO::StoredTransferJob *>( _job );
    if (job->error()) {
        emit mParent->error( mParent );
        kDebug() << "pageRequestFinished error";
        return;
    }

    const QString data = QString::fromUtf8( job->data() );

    // Clear the list
    m_photoList.clear();

    xml.clear();
    xml.addData(data);

    while (!xml.atEnd()) {
        xml.readNext();

        if (xml.isStartElement()) {
            if (xml.name() == "rsp") {
                /* no pictures available for the specified parameters */
                if (xml.attributes().value ( "stat" ).toString() == "fail") {
                    /* To be sure, decrement the date to two days earlier... @TODO */
                    mActualDate = mActualDate.addDays(-2);

                            KUrl url( "http://api.flickr.com/services/rest/?api_key=a902f4e74cf1e7bce231742d8ffb46b4&method=flickr.interestingness.getList&date=" + mActualDate.toString( Qt::ISODate) );
                            KIO::StoredTransferJob *pageJob = KIO::storedGet(url, KIO::NoReload, KIO::HideProgressInfo);
                            mParent->connect( pageJob, SIGNAL( finished( KJob* ) ), SLOT( pageRequestFinished( KJob* ) ) );
                    return;
                }
            } else if (xml.name() == "photo") {
                if (xml.attributes().value ( "ispublic" ).toString() != "1")
                continue;

                QString fileUrl = QString("http://farm" + xml.attributes().value ( "farm" ).toString() + ".static.flickr.com/"
                + xml.attributes().value ( "server" ).toString() + '/' + xml.attributes().value ( "id" ).toString()
                + '_' + xml.attributes().value ( "secret" ).toString() + ".jpg");

                m_photoList.append(fileUrl);
            }
        }
    }

    if (xml.error() && xml.error() != QXmlStreamReader::PrematureEndOfDocumentError) {
        qWarning() << "XML ERROR:" << xml.lineNumber() << ": " << xml.errorString();
    }

    if (m_photoList.begin() != m_photoList.end()) {
        KUrl url( m_photoList.at(qrand() % m_photoList.size()) );
            KIO::StoredTransferJob *imageJob = KIO::storedGet(url, KIO::NoReload, KIO::HideProgressInfo);
            mParent->connect( imageJob, SIGNAL( finished( KJob* ) ), SLOT( imageRequestFinished( KJob* ) ) );
    } else {
        kDebug() << "empty list";
    }
}

void FlickrProvider::Private::imageRequestFinished( KJob *_job )
{
    KIO::StoredTransferJob *job = static_cast<KIO::StoredTransferJob *>( _job );
    if ( job->error() ) {
        emit mParent->error( mParent );
        return;
    }

    mImage = QImage::fromData( job->data() );
    emit mParent->finished( mParent );
}

FlickrProvider::FlickrProvider( QObject *parent, const QVariantList &args )
    : PotdProvider( parent, args ), d( new Private( this ) )
{
    const QString type = args[ 0 ].toString();
    if ( type == "Date" ) {
        d->mDate = args[ 1 ].toDate();
        d->mActualDate = d->mDate;
    } else {
        Q_ASSERT( false && "Invalid type passed to potd provider" );
    }

    KUrl url("http://api.flickr.com/services/rest/?api_key=a902f4e74cf1e7bce231742d8ffb46b4&method=flickr.interestingness.getList&date=" + d->mDate.toString( Qt::ISODate ) );
    KIO::StoredTransferJob *job = KIO::storedGet( url );
    connect( job, SIGNAL( finished( KJob* ) ), SLOT( pageRequestFinished( KJob* ) ) );
}

FlickrProvider::~FlickrProvider()
{
    delete d;
}

QImage FlickrProvider::image() const
{
    return d->mImage;
}

QString FlickrProvider::identifier() const
{
    return QString( "flickr:%1" ).arg( d->mDate.toString( Qt::ISODate ));
}

#include "flickrprovider.moc"
