/*
    callback.cpp

    This file is used by KMail's plugin interface.
    Copyright (c) 2004 Bo Thorsen <bo@sonofthor.dk>

    KMail 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.

    KMail 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

    In addition, as a special exception, the copyright holders give
    permission to link the code of this program with any edition of
    the TQt library by Trolltech AS, Norway (or with modified versions
    of TQt that use the same license as TQt), and distribute linked
    combinations including the two.  You must obey the GNU General
    Public License in all respects for all of the code used other than
    TQt.  If you modify this file, you may extend this exception to
    your version of the file, but you are not obligated to do so.  If
    you do not wish to do so, delete this exception statement from
    your version.
*/

#include "callback.h"
#include "kmkernel.h"
#include "kmmessage.h"
#include "kmmsgpart.h"
#include <libemailfunctions/email.h>
#include <libkpimidentities/identity.h>
#include <libkpimidentities/identitymanager.h>
#include "kmmainwin.h"
#include "composer.h"
#include "kmreaderwin.h"
#include "secondarywindow.h"
#include "transportmanager.h"

#include <mimelib/enum.h>

#include <kinputdialog.h>
#include <tdelocale.h>
#include <kdebug.h>

using namespace KMail;


Callback::Callback( KMMessage* msg, KMReaderWin* readerWin )
  : mMsg( msg ), mReaderWin( readerWin ), mReceiverSet( false )
{
}

TQString Callback::askForTransport( bool nullIdentity ) const
{
  const TQStringList transports = KMail::TransportManager::transportNames();
  if ( transports.size() == 1 )
    return transports.first();

  const TQString defaultTransport = GlobalSettings::self()->defaultTransport();
  const int defaultIndex = TQMAX( 0, transports.findIndex( defaultTransport ) );

  TQString text;
  if ( nullIdentity )
    text = i18n( "<qt>The receiver of this invitation doesn't match any of your identities.<br>"
                 "Please select the transport which should be used to send your reply.</qt>" );
  else
    text = i18n( "<qt>The identity matching the receiver of this invitation doesn't have an "
                 "associated transport configured.<br>"
                 "Please select the transport which should be used to send your reply.</qt>");
  bool ok;
  const TQString transport = KInputDialog::getItem( i18n( "Select Transport" ), text,
                                        transports, defaultIndex, false, &ok, kmkernel->mainWin() );
  if ( !ok )
    return TQString();

  return transport;
}

bool Callback::mailICal( const TQString& to, const TQString &iCal,
                         const TQString& subject, const TQString &status,
                         bool delMessage ) const
{
  kdDebug(5006) << "Mailing message:\n" << iCal << endl;

  KMMessage *msg = new KMMessage;
  msg->initHeader();
  msg->setSubject( subject );
  if ( GlobalSettings::self()->exchangeCompatibleInvitations() ) {
    if ( status == TQString("cancel") )
      msg->setSubject( i18n( "Declined: %1" ).arg(subject).replace("Answer: ","") );
    else if ( status == TQString("tentative") )
      msg->setSubject( i18n( "Tentative: %1" ).arg(subject).replace("Answer: ","") );
    else if ( status == TQString("accepted") )
      msg->setSubject( i18n( "Accepted: %1" ).arg(subject).replace("Answer: ","") );
    else if ( status == TQString("delegated") )
      msg->setSubject( i18n( "Delegated: %1" ).arg(subject).replace("Answer: ","") );
  }
  msg->setTo( to );
  msg->setFrom( receiver() );

  if ( !GlobalSettings::self()->exchangeCompatibleInvitations() ) {
    msg->setHeaderField( "Content-Type",
                         "text/calendar; method=reply; charset=\"utf-8\"" );
    msg->setBody( iCal.utf8() );
  }

  if ( delMessage && deleteInvitationAfterReply() )
    /* We want the triggering mail to be moved to the trash once this one
    * has been sent successfully. Set a link header which accomplishes that. */
    msg->link( mMsg, KMMsgStatusDeleted );

  // Try and match the receiver with an identity.
  // Setting the identity here is important, as that is used to select the correct
  // transport later
  const KPIM::Identity& identity = kmkernel->identityManager()->identityForAddress( receiver() );
  const bool nullIdentity = ( identity == KPIM::Identity::null() );
  if ( !nullIdentity ) {
    msg->setHeaderField("X-KMail-Identity", TQString::number( identity.uoid() ));
  }

  const bool identityHasTransport = !identity.transport().isEmpty();
  if ( !nullIdentity && identityHasTransport )
    msg->setHeaderField( "X-KMail-Transport", identity.transport() );
  else if ( !nullIdentity && identity.isDefault() )
    msg->setHeaderField( "X-KMail-Transport", GlobalSettings::self()->defaultTransport() );
  else {
    const TQString transport = askForTransport( nullIdentity );
    if ( transport.isEmpty() )
      return false; // user canceled transport selection dialog
    msg->setHeaderField( "X-KMail-Transport", transport );
  }

  // Outlook will only understand the reply if the From: header is the
  // same as the To: header of the invitation message.
  TDEConfigGroup options( KMKernel::config(), "Groupware" );
  if( !options.readBoolEntry( "LegacyMangleFromToHeaders", true ) ) {
    if( identity != KPIM::Identity::null() ) {
      msg->setFrom( identity.fullEmailAddr() );
    }
    // Remove BCC from identity on ical invitations (https://intevation.de/roundup/kolab/issue474)
    msg->setBcc( "" );
  }

  KMail::Composer * cWin = KMail::makeComposer();
  cWin->ignoreStickyFields();
  cWin->setMsg( msg, false /* mayAutoSign */ );
  // cWin->setCharset( "", true );
  cWin->disableWordWrap();
  cWin->setSigningAndEncryptionDisabled( true );

  if( GlobalSettings::self()->exchangeCompatibleInvitations() ) {
    // For Exchange, send ical as attachment, with proper
    // parameters
    msg->setSubject( status );
    msg->setCharset( "utf-8" );
    KMMessagePart *msgPart = new KMMessagePart;
    msgPart->setName( "cal.ics" );
    // msgPart->setCteStr( attachCte ); // "base64" ?
    msgPart->setBodyEncoded( iCal.utf8() );
    msgPart->setTypeStr( "text" );
    msgPart->setSubtypeStr( "calendar" );
    msgPart->setParameter( "method", "reply" );
    cWin->addAttach( msgPart );
  }

  cWin->disableRecipientNumberCheck();
  cWin->disableForgottenAttachmentsCheck();
  if ( options.readBoolEntry( "AutomaticSending", true ) ) {
    cWin->setAutoDeleteWindow(  true );
    cWin->slotSendNow();
  } else {
    cWin->show();
  }

  return true;
}

TQString Callback::receiver() const
{
  if ( mReceiverSet )
    // Already figured this out
    return mReceiver;

  mReceiverSet = true;

  TQStringList addrs = KPIM::splitEmailAddrList( mMsg->to() );
  int found = 0;
  for( TQStringList::Iterator it = addrs.begin(); it != addrs.end(); ++it ) {
    if( kmkernel->identityManager()->identityForAddress( *it ) !=
        KPIM::Identity::null() ) {
      // Ok, this could be us
      ++found;
      mReceiver = *it;
    }
  }
  TQStringList ccaddrs = KPIM::splitEmailAddrList( mMsg->cc() );
  for( TQStringList::Iterator it = ccaddrs.begin(); it != ccaddrs.end(); ++it ) {
    if( kmkernel->identityManager()->identityForAddress( *it ) !=
        KPIM::Identity::null() ) {
      // Ok, this could be us
      ++found;
      mReceiver = *it;
    }
  }
  if( found != 1 ) {
    bool ok;
    TQString selectMessage;
    if (found == 0) {
      selectMessage = i18n("<qt>None of your identities match the "
          "receiver of this message,<br>please "
          "choose which of the following addresses "
          "is yours, if any, or select one of your identities to use in the reply:");
      addrs += kmkernel->identityManager()->allEmails();
    } else {
      selectMessage = i18n("<qt>Several of your identities match the "
          "receiver of this message,<br>please "
          "choose which of the following addresses "
          "is yours:");
    }

    // select default identity by default
    const TQString defaultAddr = kmkernel->identityManager()->defaultIdentity().primaryEmailAddress();
    const int defaultIndex = TQMAX( 0, addrs.findIndex( defaultAddr ) );

    mReceiver =
      KInputDialog::getItem( i18n( "Select Address" ),
          selectMessage,
          addrs+ccaddrs, defaultIndex, false, &ok, kmkernel->mainWin() );
    if( !ok )
      mReceiver = TQString();
  }

  return mReceiver;
}

void Callback::closeIfSecondaryWindow() const
{
  KMail::SecondaryWindow *window = dynamic_cast<KMail::SecondaryWindow*>( mReaderWin->mainWindow() );
  if ( window )
    window->close();
}

bool Callback::askForComment( KCal::Attendee::PartStat status ) const
{
    if ( ( status != KCal::Attendee::Accepted
            && GlobalSettings::self()->askForCommentWhenReactingToInvitation()
            == GlobalSettings:: EnumAskForCommentWhenReactingToInvitation::AskForAllButAcceptance )
        || GlobalSettings::self()->askForCommentWhenReactingToInvitation()
        == GlobalSettings:: EnumAskForCommentWhenReactingToInvitation::AlwaysAsk )
        return true;
    return false;
}

bool Callback::deleteInvitationAfterReply() const
{
    return GlobalSettings::self()->deleteInvitationEmailsAfterSendingReply();
}

bool Callback::exchangeCompatibleInvitations() const
{
  return GlobalSettings::self()->exchangeCompatibleInvitations();
}

bool Callback::outlookCompatibleInvitationReplyComments() const
{
  return GlobalSettings::self()->outlookCompatibleInvitationReplyComments();
}

TQString Callback::sender() const
{
  return mMsg->from();
}
