/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Seth Spitzer <sspitzer@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
/*
 * formerly listngst.h
 * This class should ultimately be part of a news group listing
 * state machine - either by inheritance or delegation.
 * Currently, a folder pane owns one and libnet news group listing
 * related messages get passed to this object.
 */
#ifndef nsNNTPNewsgroupListState_h___
#define nsNNTPNewsgroupListState_h___

#include "nsINNTPNewsgroupList.h"
#include "nsIMsgNewsFolder.h"
#include "nsIMsgDatabase.h"
#include "nsMsgKeySet.h"
#include "nsINntpUrl.h"
#include "nsIMsgFilterList.h"
#include "nsIMsgHdr.h"
#include "nsIMsgWindow.h"

/* The below is all stuff that we remember for netlib about which
   articles we've already seen in the current newsgroup. */

typedef struct MSG_NewsKnown {
  nsMsgKeySet* set; /* Set of articles we've already gotten
                       from the newsserver (if it's marked
                       "read", then we've already gotten it).
                       If an article is marked "read", it
                       doesn't mean we're actually displaying
                       it; it may be an article that no longer
                       exists, or it may be one that we've
                       marked read and we're only viewing
                       unread messages. */

  PRInt32 first_possible; /* The oldest article in this group. */
  PRInt32 last_possible; /* The newest article in this group. */

  PRBool shouldGetOldest;
} MSG_NewsKnown;

// This class should ultimately be part of a news group listing
// state machine - either by inheritance or delegation.
// Currently, a folder pane owns one and libnet news group listing
// related messages get passed to this object.
class nsNNTPNewsgroupList : public nsINNTPNewsgroupList, public nsIMsgFilterHitNotify
#ifdef HAVE_CHANGELISTENER
/* ,public ChangeListener */
#endif
{
public:
  nsNNTPNewsgroupList();
  virtual  ~nsNNTPNewsgroupList();
  NS_DECL_ISUPPORTS
  NS_DECL_NSINNTPNEWSGROUPLIST
  NS_DECL_NSIMSGFILTERHITNOTIFY

private:
  NS_METHOD CleanUp();
     
  PRBool  m_finishingXover;

#ifdef HAVE_CHANGELISTENER
  virtual void OnAnnouncerGoingAway (ChangeAnnouncer *instigator);
#endif
  nsresult ParseLine(char *line, PRUint32 *message_number);
  nsresult GetDatabase(const char *uri, nsIMsgDatabase **db);
  void SetProgressBarPercent(PRInt32 percent);
  void SetProgressStatus(const PRUnichar *message);

protected:
  PRBool m_getOldMessages;
  PRBool m_promptedAlready;
  PRBool m_downloadAll;
  PRInt32 m_maxArticles;
  PRInt32 m_lastPercent;
  PRTime m_lastStatusUpdate;

  nsCOMPtr <nsIMsgNewsFolder> m_newsFolder;
  nsCOMPtr <nsIMsgDatabase> m_newsDB;
  nsCOMPtr <nsINntpUrl> m_runningURL;
  
  nsMsgKey m_lastProcessedNumber;
  nsMsgKey m_firstMsgNumber;
  nsMsgKey m_lastMsgNumber;
  PRInt32 m_firstMsgToDownload;
  PRInt32 m_lastMsgToDownload;
  
  struct MSG_NewsKnown m_knownArts;
  nsMsgKeySet *m_set;

private:
  nsCOMPtr <nsIMsgWindow> m_msgWindow;
  nsCOMPtr <nsIMsgFilterList> m_filterList;
  nsCOMPtr <nsIMsgDBHdr> m_newMsgHdr; /* current message header we're building */
  PRBool m_addHdrToDB;
};
    
#endif /* nsNNTPNewsgroupListState_h___ */

