/*
  Copyright (C) 2009 Klaralvdalens Datakonsult AB, a KDAB Group company, info@kdab.net
  Copyright (c) 2009 Leo Franchi <lfranchi@kde.org>

  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 "signencryptjob.h"

#include "contentjobbase_p.h"
#include "kleo/cryptobackendfactory.h"
#include "kleo/cryptobackend.h"
#include "kleo/enum.h"
#include "kleo/signencryptjob.h"
#include "util.h"

#include <kdebug.h>
#include <kmime/kmime_message.h>
#include <kmime/kmime_content.h>
#include <kmime/kmime_util.h>
#include <QBuffer>

#include <gpgme++/global.h>
#include <gpgme++/signingresult.h>
#include <gpgme++/encryptionresult.h>
#include <sstream>

using namespace MessageComposer;

class MessageComposer::SignEncryptJobPrivate : public ContentJobBasePrivate
{
public:
    SignEncryptJobPrivate( SignEncryptJob *qq )
        : ContentJobBasePrivate( qq )
        , content( 0 )
    {
    }

    KMime::Content* content;
    std::vector<GpgME::Key> signers;
    Kleo::CryptoMessageFormat format;

    std::vector<GpgME::Key> encKeys;
    QStringList recipients;
    
    // copied from messagecomposer.cpp
    bool binaryHint( Kleo::CryptoMessageFormat f )
    {
        switch ( f ) {
        case Kleo::SMIMEFormat:
        case Kleo::SMIMEOpaqueFormat:
            return true;
        default:
        case Kleo::OpenPGPMIMEFormat:
        case Kleo::InlineOpenPGPFormat:
            return false;
        }
    }

    Q_DECLARE_PUBLIC( SignEncryptJob )
};

SignEncryptJob::SignEncryptJob( QObject *parent )
    : ContentJobBase( *new SignEncryptJobPrivate( this ), parent )
{
}

SignEncryptJob::~SignEncryptJob()
{
}

void SignEncryptJob::setContent( KMime::Content* content )
{
    Q_D( SignEncryptJob );

    Q_ASSERT( content );

    d->content = content;
}

void SignEncryptJob::setCryptoMessageFormat( Kleo::CryptoMessageFormat format)
{
    Q_D( SignEncryptJob );

    // There *must* be a concrete format set at this point.
    Q_ASSERT( format == Kleo::OpenPGPMIMEFormat
              || format == Kleo::InlineOpenPGPFormat
              || format == Kleo::SMIMEFormat
              || format == Kleo::SMIMEOpaqueFormat );
    d->format = format;
}

void SignEncryptJob::setSigningKeys( std::vector<GpgME::Key>& signers )
{
    Q_D( SignEncryptJob );

    d->signers = signers;
}

KMime::Content* SignEncryptJob::origContent()
{
    Q_D( SignEncryptJob );

    return d->content;

}


void SignEncryptJob::setEncryptionKeys( const std::vector<GpgME::Key>& keys )
{
    Q_D( SignEncryptJob );

    d->encKeys = keys;
}

void SignEncryptJob::setRecipients( const QStringList& recipients ) {
    Q_D( SignEncryptJob );

    d->recipients = recipients;
}

QStringList SignEncryptJob::recipients() const {
    Q_D( const SignEncryptJob );

    return d->recipients;
}

std::vector<GpgME::Key> SignEncryptJob::encryptionKeys() const {
    Q_D( const SignEncryptJob );

    return d->encKeys;
}


void SignEncryptJob::process()
{
    Q_D( SignEncryptJob );
    Q_ASSERT( d->resultContent == 0 ); // Not processed before.

    // if setContent hasn't been called, we assume that a subjob was added
    // and we want to use that
    if( !d->content || !d->content->hasContent() ) {
        Q_ASSERT( d->subjobContents.size() == 1 );
        d->content = d->subjobContents.first();
    }

    const Kleo::CryptoBackend::Protocol *proto = 0;
    if( d->format & Kleo::AnyOpenPGP ) {
        proto = Kleo::CryptoBackendFactory::instance()->openpgp();
    } else if( d->format & Kleo::AnySMIME ) {
        proto = Kleo::CryptoBackendFactory::instance()->smime();
    } else {
        return;
    }

    //d->resultContent = new KMime::Content;

    kDebug() << "creating signencrypt from:" << proto->name() << proto->displayName();
    std::auto_ptr<Kleo::SignEncryptJob> job( proto->signEncryptJob( !d->binaryHint( d->format ), d->format == Kleo::InlineOpenPGPFormat ) );
    QByteArray encBody;
    d->content->assemble();

    // replace simple LFs by CRLFs for all MIME supporting CryptPlugs
    // according to RfC 2633, 3.1.1 Canonicalization
    QByteArray content;
    if( d->format & Kleo::InlineOpenPGPFormat ) {
        content = d->content->body();
    } else if (  !(  d->format & Kleo::SMIMEOpaqueFormat ) )  {
        content = KMime::LFtoCRLF( d->content->encodedContent() );
    } else {                    // SMimeOpaque doesn't need LFtoCRLF, else it gets munged
        content = d->content->encodedContent();
    }


    // FIXME: Make this async
    const std::pair<GpgME::SigningResult,GpgME::EncryptionResult> res = job->exec( d->signers, d->encKeys,
                                                                                   content,
                                                                                   false,
                                                                                   encBody );

    // exec'ed jobs don't delete themselves
    job->deleteLater();

    if ( res.first.error() ) {
        kDebug() << "signing failed:" << res.first.error().asString();
        setError( res.first.error().code() );
        setErrorText( QString::fromLocal8Bit( res.first.error().asString() ) );
        emitResult();
        return;
    }
    if ( res.second.error() ) {
        kDebug() << "encrypyting failed:" << res.second.error().asString();
        setError( res.second.error().code() );
        setErrorText( QString::fromLocal8Bit( res.second.error().asString() ) );
        emitResult();
        return;
    }

    QByteArray signatureHashAlgo =  res.first.createdSignature( 0 ).hashAlgorithmAsString();

    d->resultContent = MessageComposer::Util::composeHeadersAndBody( d->content, encBody, d->format, true, signatureHashAlgo );

    emitResult();
}