/*
 * This file is part of KDEPIM.
 * Copyright (c) 2010 Till Adam <adam@kde.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 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 "messagehelpers.h"

#include <Akonadi/Item>

using namespace MessageCore;
using namespace MessageCore::Util;

KMime::Message::Ptr MessageCore::Util::message( const Akonadi::Item &item )
{
  if ( !item.hasPayload<KMime::Message::Ptr>() ) {
    kWarning() << "Payload is not a MessagePtr!";
    return KMime::Message::Ptr();
  }

  return item.payload<boost::shared_ptr<KMime::Message> >();
}

bool MessageCore::Util::isStandaloneMessage( const Akonadi::Item &item )
{
  // standalone message have a valid payload, but are not, themselves valid items
  return item.hasPayload<KMime::Message::Ptr>() && !item.isValid();
}

QString MessageCore::Util::messageId( const KMime::Message::Ptr &message )
{
  if ( !message->headerByType( "Message-Id" ) )
    return QString();

  QString messageId = message->headerByType( "Message-Id" )->asUnicodeString();

  // search the end of the message id
  const int rightAngle = messageId.indexOf( QLatin1Char( '>' ) );
  if ( rightAngle != -1 )
    messageId.truncate( rightAngle + 1 );

  // now search the start of the message id
  const int leftAngle = messageId.lastIndexOf( QLatin1Char( '<' ) );
  if ( leftAngle != -1 )
    messageId = messageId.mid( leftAngle );

  return messageId;
}

void MessageCore::Util::addLinkInformation( const KMime::Message::Ptr &msg, Akonadi::Item::Id id, const Akonadi::MessageStatus &status )
{
  Q_ASSERT( status.isReplied() || status.isForwarded() || status.isDeleted() );

  QString message = msg->headerByType( "X-KMail-Link-Message" ) ? msg->headerByType( "X-KMail-Link-Message" )->asUnicodeString() : QString();
  if ( !message.isEmpty() )
    message += QChar::fromLatin1( ',' );

  QString type = msg->headerByType( "X-KMail-Link-Type" ) ? msg->headerByType( "X-KMail-Link-Type" )->asUnicodeString(): QString();
  if ( !type.isEmpty() )
    type += QChar::fromLatin1( ',' );

  message += QString::number( id );
  if ( status.isReplied() )
    type += QLatin1String( "reply" );
  else if ( status.isForwarded() )
    type += QLatin1String( "forward" );

  KMime::Headers::Generic *header = new KMime::Headers::Generic( "X-KMail-Link-Message", msg.get(), message, "utf-8" );
  msg->setHeader( header );

  header = new KMime::Headers::Generic( "X-KMail-Link-Type", msg.get(), type, "utf-8" );
  msg->setHeader( header );
}

bool MessageCore::Util::getLinkInformation( const KMime::Message::Ptr &msg, Akonadi::Item::Id &id, Akonadi::MessageStatus &status )
{
  id = -1;
  status = Akonadi::MessageStatus();

  if ( !msg->headerByType( "X-KMail-Link-Message" ) || !msg->headerByType( "X-KMail-Link-Type" ) )
    return false;

  const QStringList messages = msg->headerByType( "X-KMail-Link-Message" )->asUnicodeString().split( QLatin1Char( ',' ), QString::SkipEmptyParts );
  const QStringList types = msg->headerByType( "X-KMail-Link-Type" )->asUnicodeString().split( QLatin1Char( ',' ), QString::SkipEmptyParts );
  if ( messages.isEmpty() || types.isEmpty() )
    return false;

  id = messages.first().toLongLong();

  const QString type = types.first();
  if ( type == QLatin1String( "reply" ) )
    status = Akonadi::MessageStatus::statusReplied();
  else if ( type == QLatin1String( "forward" ) )
    status = Akonadi::MessageStatus::statusForwarded();

  return true;
}
