tdepim/kmail/kmmessage.h

// -*- mode: C++; c-file-style: "gnu" -*-
/* kmmessage.h: Mime Message Class
 *
 */
#ifndef kmmessage_h
#define kmmessage_h

/** @file This file defines Mime Message classes. */

// for large file support
#include <config.h>
#include <sys/types.h>

#include <mimelib/string.h>
#include "kmmsgbase.h"
#include "isubject.h"

#include <kmime_mdn.h>

#include<libemailfunctions/email.h>

template <typename T>
class TQValueList;

class TQStringList;
class TQString;
class TQTextCodec;
class TQStrList;

class KMFolder;
class KMFolderIndex;
class DwMessage;
class KMMessagePart;
class KMMsgInfo;
class KMHeaders;
class KMForwardDigestCommand;

namespace KMime {
  class CharFreq;
  namespace Types {
    class AddrSpec;
    class Address;
    typedef TQValueList<Address> AddressList;
    typedef TQValueList<AddrSpec> AddrSpecList;
  }
}

namespace KMail {
  class HeaderStrategy;
}

class DwEntity;
class DwBodyPart;
class DwMediaType;
class DwHeaders;

class partNode;

namespace KMail {
  enum ReplyStrategy { ReplySmart = 0,
                       ReplyAuthor,
                       ReplyList,
                       ReplyAll,
                       ReplyNone };
}

/** This is a Mime Message. */
class KMMessage: public KMMsgBase, public KMail::ISubject
{
  friend class ::KMForwardDigestCommand; // needed for MIME Digest forward

public:
  // promote some of KMMsgBase's methods to public:
  using KMMsgBase::parent;
  using KMMsgBase::setParent;
  using KMMsgBase::enableUndo; // KMFolder
  using KMMsgBase::setEnableUndo; // dto.
  using KMMsgBase::isRead; // dto.
  using KMMsgBase::isUnread; // dto.
  using KMMsgBase::isNew; // dto.
  using KMMsgBase::isOld;
  using KMMsgBase::isWatched;
  using KMMsgBase::isIgnored;
  using KMMsgBase::setEncryptionStateChar; // KMAcct*
  using KMMsgBase::setSignatureStateChar; // dto.

  /** Straight forward initialization. */
  KMMessage(KMFolder* parent=0);

  /** Constructor from a DwMessage. KMMessage takes possession of the
      DwMessage, so don't dare to delete it.
  */
  KMMessage(DwMessage*);

  /** Copy constructor. Does *not* automatically load the message. */
  KMMessage(KMMsgInfo& msgInfo);

  /** Copy constructor. */
  KMMessage( const KMMessage& other );

#if 0 // currently unused
  /** Assignment operator. */
  const KMMessage& operator=( const KMMessage& other ) {
    if( &other == this )
      return *this;
    assign( other );
    return *this;
  }
#endif

  /** Destructor. */
  virtual ~KMMessage();

  /** Get KMMsgBase for this object */
  KMMsgBase & toMsgBase() { return *this; }
  const KMMsgBase & toMsgBase() const { return *this; }

  /** Returns TRUE if object is a real message (not KMMsgInfo or KMMsgBase) */
  bool isMessage() const;

  /** @return whether the priority: or x-priority headers indicate
       that this message should be considered urgent
   **/
  bool isUrgent() const;

  /** Specifies an unencrypted copy of this message to be stored
      in a separate member variable to allow saving messages in
      unencrypted form that were sent in encrypted form.
      NOTE: Ownership of @p unencrypted transfers to this KMMessage,
            and it will be deleted in the d'tor.
  */
  void setUnencryptedMsg( KMMessage* unencrypted );

  /** Returns TRUE if the message contains an unencrypted copy of itself. */
  bool hasUnencryptedMsg() const { return 0 != mUnencryptedMsg; }

  /** Returns an unencrypted copy of this message or 0 if none exists. */
  KMMessage* unencryptedMsg() const { return mUnencryptedMsg; }

  /** Returns an unencrypted copy of this message or 0 if none exists.
      \note This function removes the internal unencrypted message pointer
      from the message: the process calling takeUnencryptedMsg() must
      delete the returned pointer when no longer needed.
  */
  KMMessage* takeUnencryptedMsg()
  {
    KMMessage* ret = mUnencryptedMsg;
    mUnencryptedMsg = 0;
    return ret;
  }

  /** Mark the message as deleted */
  void del() { setqStatus(KMMsgStatusDeleted); }

  /** Undelete the message. Same as touch */
  void undel() { setqStatus(KMMsgStatusOld); }

  /** Touch the message - mark it as read */
  void touch() { setqStatus(KMMsgStatusOld); }

  /** Create a new message that is a reply to this message, filling all
      required header fields with the proper values. The returned message
      is not stored in any folder. Marks this message as replied. */
  KMMessage* createReply( KMail::ReplyStrategy replyStrategy = KMail::ReplySmart,
                          TQString selection=TQString(), bool noQuote = false,
                          bool allowDecryption = true,
                          const TQString &tmpl = TQString() );

  /** Create a new message that is a redirect to this message, filling all
    required header fields with the proper values. The returned message
    is not stored in any folder. Marks this message as replied.
    Redirects differ from forwards so they are forwarded to some other
    user, mail is not changed and the reply-to field is set to
    the email address of the original sender
   */
  KMMessage* createRedirect( const TQString &toStr );

  /** Create the forwarded body for the message. */
  TQCString createForwardBody();

  /** Create a new message that is a forward of this message, filling all
    required header fields with the proper values. The returned message
    is not stored in any folder. Marks this message as forwarded. */
  KMMessage* createForward( const TQString &tmpl = TQString() );

  /** Create a new message that is a delivery receipt of this message,
      filling required header fileds with the proper values. The
      returned message is not stored in any folder. */
  KMMessage* createDeliveryReceipt() const;

  /** Create a new message that is a MDN for this message, filling all
      required fields with proper values. The returned message is not
      stored in any folder.

      @param a Use AutomaticAction for filtering and ManualAction for
               user-induced events.
      @param d See docs for KMime::MDN::DispositionType
      @param m See docs for KMime::MDN::DispositionModifier
      @param allowGUI Set to true if this method is allowed to ask the
                      user questions

      @return The notification message or 0, if none should be sent.
   **/
  KMMessage* createMDN( KMime::MDN::ActionMode a,
          KMime::MDN::DispositionType d,
          bool allowGUI=false,
          TQValueList<KMime::MDN::DispositionModifier> m=TQValueList<KMime::MDN::DispositionModifier>() );

  /** Remove all headers but the content description ones, and those in the white list. */
  void sanitizeHeaders( const TQStringList& whiteList = TQStringList() );

  /** Parse the string and create this message from it. */
  void fromDwString(const DwString& str, bool setqStatus=false);
  void fromString(const TQCString& str, bool setqStatus=false);
  void fromByteArray(const TQByteArray & ba, bool setqStatus=false);

  /** Return the entire message contents in the DwString. This function
      is *fast* even for large message since it does *not* involve a
      string copy.
  */
  const DwString& asDwString() const;
  const DwMessage *asDwMessage();

  /** Return the entire message contents as a string. This function is
      slow for large message since it involves a string copy. If you
      need the string representation only for a short time
      (i.e. without the chance of calling any function in the
      underlying mimelib, then you should use the asDwString function.
      @see asDwString
  */
  TQCString asString() const;

  /**
   * Return the message contents with the headers that should not be
   * sent stripped off.
   */
  TQByteArray asSendableString() const;

  /**
   * Return the message header with the headers that should not be
   * sent stripped off.
   */
  TQCString headerAsSendableString() const;

  /**
   * Remove all private header fields: *tqStatus: and X-KMail-*
   **/
  void removePrivateHeaderFields();

  /** Return reference to Content-Type header for direct manipulation. */
  DwMediaType& dwContentType();

  /** Return header as string. */
  TQString headerAsString() const;

  /** Returns a decoded body part string to be further processed
    by function asQuotedString().
    THIS FUNCTION WILL BE REPLACED ONCE KMime IS FULLY INTEGRATED
    (khz, June 05 2002)*/
  void parseTextStringFromDwPart( partNode * root,
                                          TQCString& parsedString,
                                          const TQTextCodec*& codec,
                                          bool& isHTML ) const;

  /** Initialize header fields. Should be called on new messages
    if they are not set manually. E.g. before composing. Calling
    of setAutomaticFields(), see below, is still required. */
  void initHeader(uint identity=0);

  /** Initialize headers fields according to the identity and the transport
    header of the given original message */
  void initFromMessage(const KMMessage *msg, bool idHeaders = true);

  /** @return the UOID of the identity for this message.
      Searches the "x-kmail-identity" header and if that fails,
      searches with KPIM::IdentityManager::identityForAddress()
      and if that fails queries the KMMsgBase::parent() folder for a default.
   **/
  uint identityUoid() const;

  /** Set the from, to, cc, bcc, encrytion etc headers as specified in the
   * given identity. */
  void applyIdentity( uint id );

  /** Removes empty fields from the header, e.g. an empty Cc: or Bcc:
    field. */
  void cleanupHeader();

  /** Set fields that are either automatically set (Message-id)
    or that do not change from one message to another (MIME-Version).
    Call this method before sending *after* all changes to the message
    are done because this method does things different if there are
    attachments / multiple body parts. */
  void setAutomaticFields(bool isMultipart=false);

  /** Get or set the 'Date' header field */
  TQString dateStr() const;
  /** Returns the message date in asctime format or an empty string if the
      message lacks a Date header. */
  TQCString dateShortStr() const;
  TQString dateIsoStr() const;
  time_t date() const;
  void setDate(const TQCString& str);
  void setDate(time_t aUnixTime);

  /** Set the 'Date' header field to the current date. */
  void setDateToday();

  /** Get or set the 'To' header field */
  TQString to() const;
  void setTo(const TQString& aStr);
  TQString toStrip() const;

  /** Get or set the 'ReplyTo' header field */
  TQString replyTo() const;
  void setReplyTo( const TQString &aStr );
  void setReplyTo(KMMessage*);

  /** Get or set the 'Cc' header field */
  TQString cc() const;
  void setCc( const TQString &aStr );
  TQString ccStrip() const;

  /** Get or set the 'Bcc' header field */
  TQString bcc() const;
  void setBcc( const TQString &aStr );

  /** Get or set the 'Fcc' header field */
  TQString fcc() const;
  void setFcc( const TQString &aStr );

  /** Get or set the 'Drafts' folder */
  TQString drafts() const { return mDrafts; }
  void setDrafts( const TQString &aStr );

  /** Get or set the 'Templates' folder */
  TQString templates() const { return mTemplates; }
  void setTemplates( const TQString &aStr );

  /** Get or set the 'From' header field */
  TQString from() const;
  void setFrom(const TQString& aStr);
  TQString fromStrip() const;

  /** @return The addr-spec of either the Sender: (if one is given) or
   * the first addr-spec in From: */
  TQString sender() const;

  /** Get or set the 'Who' header field. The actual field that is
      returned depends on the contents of the owning folders whoField().
      Usually this is 'From', but it can also contain 'To'. */
  TQString who() const;

  /** Get or set the 'Subject' header field */
  TQString subject() const;
  void setSubject(const TQString& aStr);

  /** Calculate strippedSubject */
  void initStrippedSubjectMD5() {};

  /** Get or set the 'X-Mark' header field */
  TQString xmark() const;
  void setXMark(const TQString& aStr);

  /** Get or set the 'In-Reply-To' header field */
  TQString replyToId() const;
  void setReplyToId(const TQString& aStr);
  TQString replyToIdMD5() const;

  /** Get the second to last id from the References header
      field. If outgoing messages are not kept in the same
      folder as incoming ones, this will be a good place to
      thread the message beneath.
      bob               <- second to last reference points to this
       |_kmailuser      <- not in our folder, but Outbox
           |_bob        <- In-Reply-To points to our mail above

      Thread like this:
      bob
       |_bob

      using replyToAuxIdMD5
    */
  TQString replyToAuxIdMD5() const;

  /**
    Get a hash of the subject with all prefixes such as Re: removed.
    Used for threading.
  */
  TQString strippedSubjectMD5() const;

  /**
    Validate a list of email addresses, and also allow
    aliases and distribution lists to be expanded
    before validation.
    @return Enum to describe the error.
    @return brokenAddress the address that was faulty.
    FIXME: this should be in libemailfucntions but that
           requires moving expandAliases and all that
           it brings
  */
  static KPIM::EmailParseResult isValidEmailAddressList( const TQString& aStr,
                                                         TQString& brokenAddress );

  /**
    Get a hash of the subject.
    Used for threading.
  */
  TQString subjectMD5() const;

  /** Is the subject prefixed by Re: or similar? */
  bool subjectIsPrefixed() const;

  /** Get or set the 'Message-Id' header field */
  TQString msgId() const;
  void setMsgId(const TQString& aStr);
  TQString msgIdMD5() const;

  /** Get or set the references for this message */
  TQString references() const;
  void setReferences(const TQCString& aStr);

  /** Returns the message ID, useful for followups */
  TQCString id() const;

  /** Sets the message serial number. If defaulted to zero, the
    serial number will be assigned using the dictionary. Note that
    unless it is explicitely set the serial number will remain 0
    as long as the mail is not in a folder. */
  void setMsgSerNum(unsigned long newMsgSerNum = 0);

  /** Returns the value of a header field with the given name. If multiple
      header fields with the given name might exist then you should use
      headerFields() instead.
  */
  TQString headerField(const TQCString& name) const;

  enum HeaderFieldType { Unstructured, Structured, Address };

  /** Set the header field with the given name to the given value.
      If prepend is set to true, the header is inserted at the beginning
      and does not overwrite an existing header field with the same name.
  */
  void setHeaderField( const TQCString& name, const TQString& value,
                       HeaderFieldType type = Unstructured,
                       bool prepend = false );

  /** Returns a list of the values of all header fields with the given name. */
  TQStringList headerFields( const TQCString& name ) const;

  /** Returns the raw value of a header field with the given name. If multiple
      header fields with the given name might exist then you should use
      rawHeaderFields() instead.
  */
  TQCString rawHeaderField( const TQCString & name ) const;

  /** Returns a list of the raw values of all header fields with the given
      name.
  */
  TQValueList<TQCString> rawHeaderFields( const TQCString & field ) const;

  /** Splits the given address list into separate addresses. */
  static KMime::Types::AddressList splitAddrField( const TQCString & str );

  /** Returns header address list as string list.
      Valid for the following fields: To, Bcc, Cc, ReplyTo, ResentBcc,
      ResentCc, ResentReplyTo, ResentTo */
  KMime::Types::AddressList headerAddrField(const TQCString& name) const;
  KMime::Types::AddrSpecList extractAddrSpecs( const TQCString & headerNames ) const;

  /** Remove header field with given name */
  void removeHeaderField(const TQCString& name);

  /** Remove all header fields with given name */
  void removeHeaderFields(const TQCString& name);

  /** Get or set the 'Content-Type' header field
      The member functions that involve enumerated types (ints)
      will work only for well-known types or subtypes. */
  TQCString typeStr() const;
  int type() const;
  void setTypeStr(const TQCString& aStr);
  void setType(int aType);
  /** Subtype */
  TQCString subtypeStr() const;
  int subtype() const;
  void setSubtypeStr(const TQCString& aStr);
  void setSubtype(int aSubtype);
  /** add or change a parameter of a DwMediaType field */
  static void setDwMediaTypeParam( DwMediaType &mType,
                                   const TQCString& attr,
                                   const TQCString& val );
  /** add or change a parameter of the Content-Type field */
  void setContentTypeParam(const TQCString& attr, const TQCString& val);

  /** get the DwHeaders
      (make sure to call setNeedsAssembly() function after directly
       modyfying internal data like the headers) */
  DwHeaders& headers() const;

  /** tell the message that internal data were changed
      (must be called after directly modifying message structures
       e.g. when like changing header information by accessing
       the header via headers() function) */
  void setNeedsAssembly();

  /**
   * Assemble the internal message. This is done automatically in most
   * cases, but sometimes still necessary to call this manually.
   */
  void assembleIfNeeded();

  /**
   * Get or set the 'Content-Transfer-Encoding' header field
   * The member functions that involve enumerated types (ints)
   * will work only for well-known encodings.
   * Some functions take a DwEntity as second parameter, which
   * specifies the body part or message of which the CTE will be changed or
   * returned. If this is zero, the toplevel message will be taken.
   */
  TQCString contentTransferEncodingStr() const;
  int contentTransferEncoding( DwEntity *entity = 0 ) const;
  void setContentTransferEncodingStr( const TQCString& cteString, DwEntity *entity = 0 );
  void setContentTransferEncoding( int cte, DwEntity *entity = 0 );

  /**
   * Cte is short for ContentTransferEncoding.
   * These functions are an alternative to the ones with longer names.
   */
  TQCString cteStr() const { return contentTransferEncodingStr(); }
  int cte( DwEntity *entity = 0 ) const { return contentTransferEncoding( entity ); }
  void setCteStr( const TQCString& aStr, DwEntity *entity = 0 ) {
    setContentTransferEncodingStr( aStr, entity );
  }
  void setCte( int aCte, DwEntity *entity = 0 ) {
    setContentTransferEncoding( aCte, entity );
  }

  /**
   * Sets this body's content to @p str. @p str is subject to
   * automatic charset and CTE detection.
   *
   * @param entity The body of this entity will be changed. If entity is 0,
   *               the body of the whole message will be changed.
   */
  void setBodyFromUnicode( const TQString & str, DwEntity *entity = 0 );

  /** Returns the body part decoded to tqunicode.
   **/
  TQString bodyToUnicode(const TQTextCodec* codec=0) const;

  /** Get the message body. Does not decode the body. */
  TQCString body() const;

  /** Set the message body. Does not encode the body. */
  void setBody(const TQCString& aStr);
  void setBody(const DwString& aStr);
  void setBody(const char* aStr); // avoid ambiguous calls

  /** Hack to enable structured body parts to be set as flat text... */
  void setMultiPartBody( const TQCString & aStr );

  /**
   * Set the message body, encoding it according to the current content
   * transfer encoding. The first method for null terminated strings,
   * the second for binary data.
   *
   * @param entity Specifies the body part or message of which the body will be
   *               set. If this is 0, the body of the toplevel message will be
   *               set.
   */
  void setBodyEncoded( const TQCString& aStr, DwEntity *entity = 0 );
  void setBodyEncodedBinary( const TQByteArray& aStr, DwEntity *entity = 0 );

  /** Returns a list of content-transfer-encodings that can be used with
      the given result of the character frequency analysis of a message or
      message part under the given restrictions. */
  static TQValueList<int> determineAllowedCtes( const KMime::CharFreq& cf,
                                               bool allow8Bit,
                                               bool willBeSigned );

  /**
   * Sets body, encoded in the best fitting
   * content-transfer-encoding, which is determined by character
   * frequency count.
   *
   * @param aBuf         input buffer
   * @param allowedCte   return: list of allowed cte's
   * @param allow8Bit    whether "8bit" is allowed as cte.
   * @param willBeSigned whether "7bit"/"8bit" is allowed as cte according to RFC 3156
   * @param entity       The body of this message or body part will get changed.
   *                     If this is 0, the body of the toplevel message will be
   *                     set.
   */
  void setBodyAndGuessCte( const TQByteArray& aBuf, TQValueList<int>& allowedCte,
                           bool allow8Bit = false,
                           bool willBeSigned = false,
                           DwEntity *entity = 0 );

  void setBodyAndGuessCte( const TQCString& aBuf,
                           TQValueList<int>& allowedCte,
                           bool allow8Bit = false,
                           bool willBeSigned = false,
                           DwEntity *entity = 0 );

  /** Returns a decoded version of the body from the current content transfer
      encoding. The first method returns a null terminated string, the second
      method is meant for binary data, not null is appended */
  TQCString bodyDecoded() const;
  TQByteArray bodyDecodedBinary() const;

  /** Number of body parts the message has. This is one for plain messages
      without any attachment. */
  int numBodyParts() const;

  /** Return the first DwBodyPart matching a given Content-Type
      or zero, if no found. */
  DwBodyPart * findDwBodyPart( int type, int subtype ) const;

  /** Return the first DwBodyPart matching a given Content-Type
      or zero, if no found. */
  DwBodyPart * findDwBodyPart( const TQCString& type, const TQCString&  subtype ) const;

  /** Return the first DwBodyPart matching a given partSpecifier
      or zero, if no found. */
  DwBodyPart* findDwBodyPart( DwBodyPart* part, const TQString & partSpecifier );

  /** Get the DwBodyPart at position in aIdx.  Indexing starts at 0.
      If there is no body part at that index, return value will be zero. */
  DwBodyPart * dwBodyPart( int aIdx ) const;

  /** Get the number of the given DwBodyPart.
      If no body part is given, return value will be -1. */
  int partNumber( DwBodyPart * aDwBodyPart ) const;

  /** Get the 1st DwBodyPart.
      If there is no body part, return value will be zero. */
  DwBodyPart * getFirstDwBodyPart() const;
  DwMessage * getTopLevelPart() const { return mMsg; }

  /** Fill the KMMessagePart structure for a given DwBodyPart.
      If withBody is false the body of the KMMessagePart will be left
      empty and only the headers of the part will be filled in*/
  static void bodyPart(DwBodyPart* aDwBodyPart, KMMessagePart* aPart,
          bool withBody = true );

  /** Get the body part at position in aIdx.  Indexing starts at 0.
      If there is no body part at that index, aPart will have its
      attributes set to empty values. */
  void bodyPart(int aIdx, KMMessagePart* aPart) const;

  /** Compose a DwBodyPart (needed for adding a part to the message). */
  DwBodyPart* createDWBodyPart(const KMMessagePart* aPart);

  /** Append a DwBodyPart to the message. */
  void addDwBodyPart(DwBodyPart * aDwPart);

  /** Append a body part to the message. */
  void addBodyPart(const KMMessagePart* aPart);

  /** Delete all body parts. */
  void deleteBodyParts();

  /**
   * Delete a body part with the specified part index.
   * A dummy body part with the text "the attachment foo was deleted" will replace the old part.
   */
  bool deleteBodyPart( int partIndex );

  /** Set "Status" and "X-Status" fields of the message from the
   * internal message status. */
  void seStatusFields();

  /** Generates the Message-Id. It uses either the Message-Id suffix
   * defined by the user or the given email address as suffix. The address
   * must be given as addr-spec as defined in RFC 2822.
   */
  static TQString generateMessageId( const TQString& addr );

  /** Convert '<' into "&lt;" resp. '>' into "&gt;" in order to
    * prevent their interpretation by KHTML.
    * Does *not* use the TQt replace function but runs a very fast C code
    * the same way as lf2crlf() does.
   */
  static TQCString html2source( const TQCString & src );

  /** Encodes an email address as mailto URL
   */
  static TQString encodeMailtoUrl( const TQString& str );

  /** Decodes a mailto URL
    */
  static TQString decodeMailtoUrl( const TQString& url );

  /** This function generates a displayable string from a list of email
      addresses.
      Input : mailbox-list
      Output: comma separated list of display name resp. comment resp.
              address
  */
  static TQCString stripEmailAddr(const TQCString& emailAddr);

  /** Does the same as the above function. Shouldn't be used.
   */
  static TQString stripEmailAddr(const TQString& emailAddr);

  /** Quotes the following characters which have a special meaning in HTML:
   * '<'  '>'  '&'  '"'. Additionally '\\n' is converted to "<br />" if
   * @p removeLineBreaks is false. If @p removeLineBreaks is true, then
   * '\\n' is removed. Last but not least '\\r' is removed.
   */
  static TQString quoteHtmlChars( const TQString& str,
                                 bool removeLineBreaks = false );

  /** Converts the email address(es) to (a) nice HTML mailto: anchor(s).
   * If stripped is TRUE then the visible part of the anchor contains
   * only the name part and not the given emailAddr.
   */
  static TQString emailAddrAsAnchor(const TQString& emailAddr,
          bool stripped=true, const TQString& cssStyle = TQString(), bool link = true);

  /** Strips an address from an address list. This is for example used
      when replying to all.
  */
  static TQStringList stripAddressFromAddressList( const TQString& address,
                                                  const TQStringList& addresses );

  /** Strips all the user's addresses from an address list. This is used
      when replying.
  */
  static TQStringList stripMyAddressesFromAddressList( const TQStringList& list );

  /** Returns true if the given address is contained in the given address list.
  */
  static bool addressIsInAddressList( const TQString& address,
                                      const TQStringList& addresses );

  /** Expands aliases (distribution lists and nick names) and appends a
      domain part to all email addresses which are missing the domain part.
  */
  static TQString expandAliases( const TQString& recipients );

  /** Uses the hostname as domain part and tries to determine the real name
      from the entries in the password file.
  */
  static TQString guessEmailAddressFromLoginName( const TQString& userName );

  /**
   *  Given argument msg add quoting characters and retqlayout for max width maxLength
   *  @param msg the string which it to be quoted
   *  @param maxLineLength reformat text to be this amount of columns at maximum, adding
   *    linefeeds at word boundaries to make it fit.
   */
  static TQString smartQuote( const TQString &msg, int maxLineLength );

  /** Get the default message charset.*/
  static TQCString defaultCharset();

  /** Get a list of preferred message charsets.*/
  static const TQStringList &preferredCharsets();

  /** Replaces every occurrence of "${foo}" in @p s with headerField("foo") */
  TQString replaceHeadersInString( const TQString & s ) const;

  /** Get the message charset.*/
  TQCString charset() const;

  /**
   * Sets the charset of the message or a subpart of the message.
   * Only call this when the message or the subpart has a textual mimetype.
   *
   * @param aStr the MIME-compliant charset name, like 'ISO-88519-15'.
   * @param entity the body part or message of which the charset should be changed.
   *               If this is 0, the charset of the toplevel message will be changed.
   */
  void setCharset( const TQCString& charset, DwEntity *entity = 0 );

  /** Get a TQTextCodec suitable for this message part */
  const TQTextCodec * codec() const;

  /** Set the charset the user selected for the message to display */
  void setOverrideCodec( const TQTextCodec* codec ) { mOverrideCodec = codec; }

  /** Allow decoding of HTML for quoting */
  void setDecodeHTML(bool aDecodeHTML)
  { mDecodeHTML = aDecodeHTML; }

  /** Reads config settings from group "KMMessage" and sets all internal
   * variables (e.g. indent-prefix, etc.) */
  static void readConfig();

  /** Creates reference string for reply to messages.
   *  reference = original first reference + original last reference + original msg-id
   */
  TQCString getRefStr() const;

  /** Get/set offset in mail folder. */
  off_t folderOffset() const { return mFolderOffset; }
  void setFolderOffset(off_t offs) { if(mFolderOffset != offs) { mFolderOffset=offs; setDirty(true); } }

  /** Get/set filename in mail folder. */
  TQString fileName() const { return mFileName; }
  void setFileName(const TQString& file) { if(mFileName != file) { mFileName=file; setDirty(true); } }

  /** Get/set size of message in the folder including the whole header in
      bytes. Can be 0, if the message is not in a folder.
      The setting of mMsgSize = mMsgLength = sz is needed for popFilter*/
  size_t msgSize() const { return mMsgSize; }
  void setMsgSize(size_t sz) { if(mMsgSize != sz) { mMsgSize = sz; setDirty(true); } }

  /** Unlike the above function this works also, if the message is not in a
      folder */
  size_t msgLength() const
    { return (mMsgLength) ? mMsgLength : mMsgSize; }
  void setMsgLength(size_t sz) { mMsgLength = sz; }

  /** Get/set size on server */
  size_t msgSizeServer() const;
  void setMsgSizeServer(size_t sz);

  /** Get/set UID */
  ulong UID() const;
  void setUID(ulong uid);

  /** tqStatus of the message. */
  KMMsgtqStatus status() const { return mtqStatus; }
  /** Set status and mark dirty. */
  void setqStatus(const KMMsgtqStatus status, int idx = -1);
  void setqStatus(const char* s1, const char* s2=0) { KMMsgBase::setqStatus(s1, s2); }

  /** Set encryption status of the message. */
  void setEncryptionState(const KMMsgEncryptionState, int idx = -1);

  /** Set signature status of the message. */
  void setSignatureState(const KMMsgSignatureState, int idx = -1);

  void setMDNSentState( KMMsgMDNSentState status, int idx=-1 );

  /** Encryption status of the message. */
  KMMsgEncryptionState encryptionState() const { return mEncryptionState; }

  /** Signature status of the message. */
  KMMsgSignatureState signatureState() const { return mSignatureState; }

  KMMsgMDNSentState mdnSentState() const { return mMDNSentState; }

  /** Links this message to @p aMsg, setting link type to @p atqStatus. */
  void link(const KMMessage *aMsg, KMMsgtqStatus atqStatus);
  /** Returns the information for the Nth link into @p retMsg
   * and @p retqStatus. */
  void getLink(int n, ulong *retMsgSerNum, KMMsgtqStatus *retqStatus) const;

  /** Convert wildcards into normal string */
  TQString formatString(const TQString&) const;

  /** Sets the body of the specified part */
  void updateBodyPart(const TQString partSpecifier, const TQByteArray & data);

  /** Returns the last DwBodyPart that was updated */
  DwBodyPart* lastUpdatedPart() { return mLastUpdated; }

  /** Return true if the complete message is available without referring to the backing store.*/
  bool isComplete() const { return mComplete; }
  /** Set if the message is a complete message */
  void setComplete( bool v ) { mComplete = v; }

  /** Return if the message is ready to be shown */
  bool readyToShow() const { return mReadyToShow; }
  /** Set if the message is ready to be shown */
  void setReadyToShow( bool v ) { mReadyToShow = v; }

  void updateAttachmentState( DwBodyPart *part = 0 );
  void updateInvitationState();

  /** Return, if the message should not be deleted */
  bool transferInProgress() const;
  /** Set that the message shall not be deleted because it is still required */
  void setTransferInProgress(bool value, bool force = false);

  /** Returns an mbox message separator line for this message, i.e. a
      string of the form
      "From local@domain.invalid Sat Jun 12 14:00:00 2004\n".
  */
  TQCString mboxMessageSeparator();

  /** Returns message body with quoting header and indented by the
    given indentation string. This is suitable for including the message
    in another message of for replies, forwards. The header string is
    a template where the following fields are replaced with the
    corresponding values:
    <pre>
        %D: date of this message
        %S: subject of this message
        %F: sender (from) of this message
        %%: a single percent sign
    </pre>
    No attachments are handled if includeAttach is false.
    The signature is stripped if aStripSignature is true and
    smart quoting is turned on. Signed or encrypted texts
    get converted to plain text when allowDecryption is true. */
  TQString asQuotedString( const TQString & headerStr,
          const TQString & indentStr,
          const TQString & selection=TQString(),
          bool aStripSignature=true,
          bool allowDecryption=true) const;

  /** Return the textual content of the message as plain text,
      converting HTML to plain text if necessary. */
  TQString asPlainText( bool stripSignature, bool allowDecryption ) const;

  /**
   * Same as asPlainText(), only that this method expects an already parsed object tree as
   * paramter.
   * By passing an already parsed objecttree, this allows to share the objecttree and therefore
   * reduce the amount of parsing (which can include decrypting, which can include a passphrase dialog)
   */
  TQString asPlainTextFromObjectTree( partNode *root, bool stripSignature,
                                     bool allowDecryption ) const;

  /** Get stored cursor position */
  int getCursorPos() { return mCursorPos; };
  /** Set cursor position as offset from message start */
  void setCursorPos(int pos) { mCursorPos = pos; };

  /** Get the KMMsgInfo object that was set with setMsgInfo(). */
  KMMsgInfo* msgInfo() { return mMsgInfo; }
  /** Set the KMMsgInfo object corresponding to this message. */
  void setMsgInfo( KMMsgInfo* msgInfo ) { mMsgInfo = msgInfo; }

  /* This is set in kmreaderwin if a message is being parsed to avoid
     other parts of kmail (e.g. kmheaders) destroying the message.
     Parsing can take longer and can be async (in case of gpg mails) */
  bool isBeingParsed() const { return mIsParsed; }
  void setIsBeingParsed( bool t ) { mIsParsed = t; }

  /** Delete this message as soon as it no longer in use. */
  void deleteWhenUnused();

  DwBodyPart* findPart( int index );

private:

  /** Initialization shared by the ctors. */
  void init( DwMessage* aMsg = 0 );
  /** Assign the values of @param other to this message. Used in the copy c'tor. */
  void assign( const KMMessage& other );

  DwBodyPart* findPartInternal( DwEntity* root, int index, int &accu );

  TQString mDrafts;
  TQString mTemplates;
  mutable DwMessage* mMsg;
  mutable bool mNeedsAssembly :1;
  bool mDecodeHTML :1;
  bool mReadyToShow :1;
  bool mComplete :1;
  bool mIsParsed : 1;
  static const KMail::HeaderStrategy * sHeaderStrategy;
  static TQString sForwardStr;
  const TQTextCodec * mOverrideCodec;

  TQString mFileName;
  off_t mFolderOffset;
  size_t mMsgSize, mMsgLength;
  time_t mDate;
  KMMsgEncryptionState mEncryptionState;
  KMMsgSignatureState mSignatureState;
  KMMsgMDNSentState mMDNSentState;
  KMMessage* mUnencryptedMsg;
  DwBodyPart* mLastUpdated;
  int mCursorPos;
  KMMsgInfo* mMsgInfo; // used to remember the KMMsgInfo object this KMMessage replaced in the KMMsgList
  static TQValueList<KMMessage*> sPendingDeletes;
};


#endif /*kmmessage_h*/