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#ifndef _nsNewsDownloader_H_
#define _nsNewsDownloader_H_


#include "nsIMsgDatabase.h"
#include "nsIUrlListener.h"
#include "nsIMsgFolder.h"
#include "nsIMsgHdr.h"
#include "nsIMsgWindow.h"
#include "nsIMsgSearchNotify.h"
#include "nsIMsgSearchSession.h"

// base class for downloading articles in a single newsgroup. Keys to download are passed in
// to DownloadArticles method.
class nsNewsDownloader : public nsIUrlListener, public nsIMsgSearchNotify
{
public:
	nsNewsDownloader(nsIMsgWindow *window, nsIMsgDatabase *db, nsIUrlListener *listener);
	virtual ~nsNewsDownloader();

  NS_DECL_ISUPPORTS
  NS_DECL_NSIURLLISTENER
  NS_DECL_NSIMSGSEARCHNOTIFY

	virtual nsresult DownloadArticles(nsIMsgWindow *window, nsIMsgFolder *folder, nsMsgKeyArray *pKeyArray);
	
	PRBool			ShouldAbort() const { return m_abort; }
	
protected:
	virtual PRInt32 Write(const char * /*block*/, PRInt32 length) {return length;}
	virtual void Abort();
	virtual void Complete();
	virtual PRBool GetNextHdrToRetrieve();
	virtual nsresult DownloadNext(PRBool firstTimeP);
	virtual PRInt32 FinishDownload() {return 0;}
	virtual PRInt32	StartDownload() {return 0;}
  virtual nsresult ShowProgress(const PRUnichar *progressString, PRInt32 percent);

	nsMsgKeyArray			m_keysToDownload;
	PRBool			m_downloadFromKeys;
	nsCOMPtr <nsIMsgFolder>	m_folder;
	nsCOMPtr <nsIMsgDatabase> m_newsDB;
  nsCOMPtr <nsIUrlListener> m_listener;
	PRBool			m_existedP;
	PRBool			m_wroteAnyP;
	PRBool			m_summaryValidP;
	PRInt32			m_numwrote;
	nsMsgKey    m_keyToDownload;
	nsCOMPtr <nsIMsgWindow>		m_window;
  nsCOMPtr <nsIMsgStatusFeedback> m_statusFeedback;
  nsCOMPtr <nsIMsgSearchSession> m_searchSession;
	nsresult				m_status;
	PRBool			m_abort;
};


// class for downloading articles in a single newsgroup to the offline store.
class DownloadNewsArticlesToOfflineStore : public nsNewsDownloader
{
public:
	DownloadNewsArticlesToOfflineStore(nsIMsgWindow *window, nsIMsgDatabase *db, nsIUrlListener *listener);
	virtual ~DownloadNewsArticlesToOfflineStore();

  NS_IMETHOD OnStartRunningUrl(nsIURI* url);
  NS_IMETHOD OnStopRunningUrl(nsIURI* url, nsresult exitCode);
protected:
	virtual PRInt32	StartDownload();
	virtual PRInt32 FinishDownload();
	virtual PRBool GetNextHdrToRetrieve();

	nsCOMPtr <nsISimpleEnumerator>	m_headerEnumerator;
	nsCOMPtr <nsIMsgDBHdr>	m_newsHeader;
//	MsgDocument		*m_dbWriteDocument;
};

// class for downloading all the articles that match the passed in search criteria
// for a single newsgroup.
class DownloadMatchingNewsArticlesToNewsDB : public DownloadNewsArticlesToOfflineStore
{
public:
	DownloadMatchingNewsArticlesToNewsDB(nsIMsgWindow *window, nsIMsgFolder *folder, nsIMsgDatabase *newsDB,  nsIUrlListener *listener);
	virtual ~DownloadMatchingNewsArticlesToNewsDB();
  nsresult RunSearch(nsIMsgFolder *folder, nsIMsgDatabase *newsDB, nsIMsgSearchSession *searchSession);
protected:
};

// this class iterates all the news servers for each group on the server that's configured for
// offline use, downloads the messages that meet the download criteria for that newsgroup/server
class nsMsgDownloadAllNewsgroups : public nsIUrlListener
{
public:
  nsMsgDownloadAllNewsgroups(nsIMsgWindow *window, nsIUrlListener *listener);
  virtual ~nsMsgDownloadAllNewsgroups();

  NS_DECL_ISUPPORTS
  NS_DECL_NSIURLLISTENER

  nsresult ProcessNextGroup();

protected:
  nsresult AdvanceToNextServer(PRBool *done);
  nsresult AdvanceToNextGroup(PRBool *done);

  DownloadMatchingNewsArticlesToNewsDB *m_downloaderForGroup;

	nsCOMPtr <nsIMsgFolder>	m_currentFolder;
  nsCOMPtr <nsIMsgWindow> m_window;
  nsCOMPtr <nsISupportsArray> m_allServers;
  nsCOMPtr <nsISupportsArray> m_allFolders;
  nsCOMPtr <nsIMsgIncomingServer> m_currentServer;
  nsCOMPtr <nsIEnumerator> m_serverEnumerator;
  nsCOMPtr <nsIUrlListener> m_listener;
  nsCOMPtr <nsISupportsArray> m_termList;
};

#endif