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#ifndef nsMsgTxn_h__
#define nsMsgTxn_h__

#include "nsITransaction.h"
#include "msgCore.h"
#include "nsCOMPtr.h"
#include "nsIMsgWindow.h"

#define NS_MESSAGETRANSACTION_IID \
{ /* da621b30-1efc-11d3-abe4-00805f8ac968 */ \
    0xda621b30, 0x1efc, 0x11d3, \
	{ 0xab, 0xe4, 0x00, 0x80, 0x5f, 0x8a, 0xc9, 0x68 } }
/**
 * base class for all message undo/redo transactions.
 */
class NS_MSG_BASE nsMsgTxn : public nsITransaction
{
    NS_DECL_ISUPPORTS 

    nsMsgTxn();
    virtual ~nsMsgTxn();

    NS_IMETHOD DoTransaction(void);

    NS_IMETHOD UndoTransaction(void) = 0;

    NS_IMETHOD RedoTransaction(void) = 0;
    
    NS_IMETHOD GetIsTransient(PRBool *aIsTransient);

    NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);

    NS_IMETHOD GetMsgWindow(nsIMsgWindow **msgWindow);
    NS_IMETHOD SetMsgWindow(nsIMsgWindow *msgWindow);
    NS_IMETHOD SetTransactionType(PRUint32 txnType);
    NS_IMETHOD GetTransactionType(PRUint32 *txnType);

protected:
    nsCOMPtr<nsIMsgWindow> m_msgWindow;
    PRUint32 m_txnType;
    nsresult CheckForToggleDelete(nsIMsgFolder *aFolder, const nsMsgKey &aMsgKey, PRBool *aResult);
};

#endif
