/*
  Copyright (c) 2009 Constantin Berzan <exit3219@gmail.com>

  Parts based on KMail code by various authors.

  This library is free software; you can redistribute it and/or modify it
  under the terms of the GNU Library General Public License as published by
  the Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  This library 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 Library General Public
  License for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to the
  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.
*/

#include "attachmentfromurljob.h"

#include <KDebug>
#include <KGlobal>
#include <KIO/Scheduler>
#include <KLocalizedString>
#include <KMimeType>
#include <KLocale>

#include <QtCore/QFileInfo>

#include <boost/shared_ptr.hpp>

using namespace MessageCore;

class MessageCore::AttachmentFromUrlJob::Private
{
public:
    Private( AttachmentFromUrlJob *qq );

    void transferJobData( KIO::Job *job, const QByteArray &jobData );
    void transferJobResult( KJob *job );

    AttachmentFromUrlJob *const q;
    QByteArray mData;
};

AttachmentFromUrlJob::Private::Private( AttachmentFromUrlJob *qq )
    : q( qq )
{
}

void AttachmentFromUrlJob::Private::transferJobData( KIO::Job *job, const QByteArray &jobData )
{
    Q_UNUSED( job );
    mData += jobData;
}

void AttachmentFromUrlJob::Private::transferJobResult( KJob *job )
{
#ifndef KDEPIM_MOBILE_UI
    if ( job->error() ) {
        // TODO this loses useful stuff from KIO, like detailed error descriptions, causes+solutions,
        // ... use UiDelegate somehow?
        q->setError( job->error() );
        q->setErrorText( job->errorString() );
        q->emitResult();
        return;
    }

    Q_ASSERT( dynamic_cast<KIO::TransferJob*>( job ) );
    KIO::TransferJob *transferJob = static_cast<KIO::TransferJob*>( job );

    // Determine the MIME type and filename of the attachment.
    const QString mimeType = transferJob->mimetype();
    kDebug() << "Mimetype is" << mimeType;

    QString fileName = q->url().fileName();
    if ( fileName.isEmpty() ) {
        const KMimeType::Ptr mimeTypePtr = KMimeType::mimeType( mimeType, KMimeType::ResolveAliases );
        if ( mimeTypePtr ) {
            fileName = i18nc( "a file called 'unknown.ext'", "unknown%1",
                              mimeTypePtr->mainExtension() );
        } else {
            fileName = i18nc( "a file called 'unknown'", "unknown" );
        }
    }
#else
    Q_UNUSED( job );
    const QString filePath = mUrl.toLocalFile();
    const QFileInfo fileInfo( filePath );
    const QString fileName = fileInfo.fileName();
    QFile file( filePath );
    if ( file.open( QFile::ReadOnly ) ) {
        mData = file.readAll();
    } else {
        q->setError( KJob::UserDefinedError );
        q->setErrorText( i18n( "Could not read file %1.", fileName ) );
        q->emitResult();
        return;
    }
    const QString mimeType = KMimeType::findByContent( mData )->name();
#endif

    // Create the AttachmentPart.
    Q_ASSERT( q->attachmentPart() == 0 ); // Not created before.

    AttachmentPart::Ptr part = AttachmentPart::Ptr( new AttachmentPart );
    part->setCharset( q->url().fileEncoding().toLatin1() );
    part->setMimeType( mimeType.toLatin1() );
    part->setName( fileName );
    part->setFileName( fileName );
    part->setUrl(q->url());
    part->setData( mData );
    q->setAttachmentPart( part );
    q->emitResult(); // Success.
}


AttachmentFromUrlJob::AttachmentFromUrlJob( const KUrl &url, QObject *parent )
    : AttachmentFromUrlBaseJob( url, parent ),
      d( new Private( this ) )
{
}

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

void AttachmentFromUrlJob::doStart()
{
    if ( !url().isValid() ) {
        setError( KJob::UserDefinedError );
        setErrorText( i18n( "\"%1\" not found. Please specify the full path.", url().prettyUrl() ) );
        emitResult();
        return;
    }

    if ( maximumAllowedSize() != -1 && url().isLocalFile() ) {
        const qint64 size = QFileInfo( url().toLocalFile() ).size();
        if ( size > maximumAllowedSize() ) {
            setError( KJob::UserDefinedError );
            setErrorText( i18n( "You may not attach files bigger than %1. Share it with storage service.",
                                KGlobal::locale()->formatByteSize( maximumAllowedSize() ) ) );
            emitResult();
            return;
        }
    }

    Q_ASSERT( d->mData.isEmpty() ); // Not started twice.

#ifndef KDEPIM_MOBILE_UI
    KIO::TransferJob *job = KIO::get( url(), KIO::NoReload,
                                      ( uiDelegate() ? KIO::DefaultFlags : KIO::HideProgressInfo ) );
    QObject::connect( job, SIGNAL(result(KJob*)),
                      this, SLOT(transferJobResult(KJob*)) );
    QObject::connect( job, SIGNAL(data(KIO::Job*,QByteArray)),
                      this, SLOT(transferJobData(KIO::Job*,QByteArray)) );
#else
    d->transferJobResult( 0 );
#endif
}

#include "moc_attachmentfromurljob.cpp"